iTeh StandardsiTeh Standards
EURUSD
Your shopping cart is empty.
ASTM

ASTM G69-97(2003)

(Test Method)

Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys

Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys

SIGNIFICANCE AND USE
The corrosion potential of an aluminum alloy depends upon the amounts of certain alloying elements that the alloy contains in solid solution. Copper and zinc, which are two of the major alloying elements for aluminum, have the greatest effect with copper shifting the potential in the noble or positive direction, and zinc in the active or negative direction. For example, commercially unalloyed aluminum (1100 alloy)3 has a potential of −750 mV when measured in accordance with this practice, 2024–T3 alloy with nearly all of its nominal 4.3 % copper in solid solution, a potential of −600 to −620 mV (Note 2), and 7072 alloy with nearly all of its nominal 1.0 % zinc in solid solution, a potential of − 885 mV (SCE) (1-3).4  
Note 2—The potential depends upon the rate of quenching.
Because it reflects the amount of certain alloying elements in solid solution, the corrosion potential is a useful tool for characterizing the metallurgical condition of aluminum alloys, especially those of the 2XXX and 7XXX types, which contain copper and zinc as major alloying elements. Its uses include the determination of the effectiveness of solution heat treatment and annealing (1), of the extent of precipitation during artificial aging (4) and welding (5), and of the extent of diffusion of alloying elements from the core into the cladding of alclad products (2).
SCOPE
1.1 This test method is a procedure for measurement of the corrosion potential (see Note 1) of an aluminum alloy in an aqueous solution of sodium chloride with enough hydrogen peroxide added to provide an ample supply of cathodic reactant.Note 1—The corrosion potential is sometimes referred to as the open-circuit solution or rest potential.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Oct-1997
ICS
77.120.10 - Aluminium and aluminium alloys
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.11 - Electrochemical Measurements in Corrosion Testing
Current Stage
Ref Project

Relations

Replaces
ASTM G69-97 - Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys
Effective Date
10-Oct-1997
Replaced By
ASTM G69-97(2009) - Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys
Effective Date
01-May-2009
Referred By
ASTM C1187-20a - Standard Guide for Establishing Surveillance Test Program for Boron-based Neutron Absorbing Material Systems for Use in Nuclear Fuel Storage Racks in Pool Environment
Effective Date
10-Oct-1997
Referred By
ASTM B918/B918M-20a - Standard Practice for Heat Treatment of Wrought Aluminum Alloys
Effective Date
10-Oct-1997
Referred By
ASTM G110-92(2022)e2 - Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
Effective Date
10-Oct-1997
Referred By
ASTM G215-17 - Standard Guide for Electrode Potential Measurement
Effective Date
10-Oct-1997
Referred By
ASTM G100-89(2021) - Standard Test Method for Conducting Cyclic Galvanostaircase Polarization
Effective Date
10-Oct-1997

Buy Standard

ASTM G69-97(2003) - Standard Test Method for Measurement of Corrosion Potentials of Aluminum AlloysASTM G69-97(2003) - Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys
PreviousNext
Standard
ASTM G69-97(2003) - Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys
English language
4 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:G69–97 (Reapproved 2003)
Standard Test Method for
Measurement of Corrosion Potentials of Aluminum Alloys
ThisstandardisissuedunderthefixeddesignationG69;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope for characterizing the metallurgical condition of aluminum
alloys, especially those of the 2XXX and 7XXX types, which
1.1 This test method is a procedure for measurement of the
contain copper and zinc as major alloying elements. Its uses
corrosion potential (see Note 1) of an aluminum alloy in an
include the determination of the effectiveness of solution heat
aqueous solution of sodium chloride with enough hydrogen
treatment and annealing (1), of the extent of precipitation
peroxide added to provide an ample supply of cathodic
during artificial aging (4) and welding (5), and of the extent of
reactant.
diffusion of alloying elements from the core into the cladding
NOTE 1—The corrosion potential is sometimes referred to as the
of alclad products (2).
open-circuit solution or rest potential.
4. Apparatus
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4.1 The apparatus consists of an inert container for the test
responsibility of the user of this standard to establish appro-
solution, a mechanical support for the test specimens that
priate safety and health practices and determine the applica-
insulates them electrically from each other and from ground,
bility of regulatory limitations prior to use.
saturated calomel electrode (SCE) (see Note 3), wires and
accessories for electrical connections, and equipment for the
2. Referenced Documents
measurement of potential.
2.1 ASTM Standards:
NOTE 3—Saturated calomel electrodes are available from several
D1193 Specification for Reagent Water
manufacturers.Itisagoodpracticetoensuretheproperfunctioningofthe
reference electrode by measuring its potential against one or more
3. Significance and Use
reference electrodes. The potential difference should not exceed 2 or 3
3.1 The corrosion potential of an aluminum alloy depends
mV.
upon the amounts of certain alloying elements that the alloy 12
4.2 A high-impedence (>10 V) voltmeter is suitable for
contains in solid solution. Copper and zinc, which are two of
measurement of the potential. Measurement of this potential
the major alloying elements for aluminum, have the greatest
should be carried out to within 6 1 mV. Automatic data
effectwithcoppershiftingthepotentialinthenobleorpositive
recording systems may be used to permit the simultaneous
direction, and zinc in the active or negative direction. For
measurementofmanyspecimensandthecontinuousrecording
example, commercially unalloyed aluminum (1100 alloy) has
of corrosion potentials.
apotentialof−750mVwhenmeasuredinaccordancewiththis
practice, 2024–T3 alloy with nearly all of its nominal 4.3%
5. Reagents
copperinsolidsolution,apotentialof−600to−620mV(Note
5.1 Purity of Reagents—Reagent grade chemicals shall be
2), and 7072 alloy with nearly all of its nominal 1.0% zinc in
used in all tests. Unless otherwise indicated, it is intended that
solid solution, a potential of−885 mV (SCE) (1-3).
all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society,
NOTE 2—The potential depends upon the rate of quenching.
where such specifications are available. Other grades may be
3.2 Because it reflects the amount of certain alloying ele-
used, provided it is first ascertained that the reagent is of
ments in solid solution, the corrosion potential is a useful tool
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
This practice is under the jurisdiction of Committee G01 on Corrosion of
Metals and is the direct responsibility of Subcommittee G01.11 on Electrochemical
Measurements in Corrosion Testing. Round-robin test conducted by G01.11 (unpublished results).
Current edition approved Oct. 10, 1997. Published December 1997. Originally Reagent Chemicals, American Chemical Society Specifications, American
e1
approved in 1981. Last previous edition approved in 1994 as G69–81(1994) . Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Annual Book of ASTM Standards, Vol 11.01. listed by the American Chemical Society, see Analar Standards for Laboratory
All alloy designations are those of the Aluminum Association. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
The boldface numbers in parentheses refer to the references at the end of this and National Formulary,U.S.PharmaceuticalConvention,Inc.(USPC),Rockville,
standard. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
G69–97 (2003)
NOTE 4—Caution:Clad products with thin claddings should only be
5.2 Purity of Water—The water shall be distilled or deion-
abraded lightly except to remove the cladding for measurement of the
ized conforming to the purity requirements of Specification
core.
D1193, Type IV reagent water.
5.3 Sodium Chloride (NaCl).
8.5 Following mechanical preparation, the specimen is
5.4 Hydrogen Peroxide (H O ) (30%)—In case of uncer-
2 2
cleaned,ordegreased,inaninertsolvent(forexample,acetone
tainty (for example, whenever freshly opened reagent is not
or perchloroethylene).
used), the concentration of hydrogen peroxide in the reagent
8.6 All parts of a specimen and its electrical connection to
shall be confirmed by chemical analysis as described inAnnex
be exposed in the test solution, except for the area of the
A1. In no case shall reagent containing less than 20%
specimen prepared for measurement, are masked off. Any
hydrogen peroxide be used.
material that masks a surface physically and electrically and
that is inert in the test solution may be used (see Annex A2).
6. Solution Conditions
6.1 The test solution shall consist of 58.5 6 0.1 g of NaCl
9. Procedure
and 9 6 1 mL of 30% hydrogen peroxide reagent per 1 L of
9.1 For corrosion potential measurements, the test speci-
aqueous solution. (This solution is 1 M with respect to
mens and the reference electrode are immersed in the appro-
concentration of sodium chloride.)
6.2 The hydrogen peroxide reagent shall be added just priate quantity of test solution; the test specimens are con-
before measurements are made because it decomposes upon nected to the positive terminal of the equipment for measuring
standing.
potential, and the reference electrode to the negative terminal.
6.3 Freshly prepared solution shall be used for each set of
9.2 Care should be taken to ensure that all the unmasked
measurements.
area of each test specimen prepared for measurement is
6.4 Not less than 500 mLof solution shall be used for each
exposed to the test solution and that any other unmasked area
set of measurements.
is not exposed. Care should also be taken to ensure that any
6.5 The total exposed area of all the specimens of the same
unmaskedportionoftheelectricalconnectionisoutsidethetest
composition in each set of measurements shall not exceed 100
solution.
mm per 100 mL of solution.
9.3 The potential of each specimen shall be measured at
6.6 The temperature of the test solution shall be maintained
5-min intervals for a period of1hor recorded continuously
at 25 6 2°C.
using the output of a high-impedance voltmeter.
9.4 The potential of each specimen shall be reported as the
7. Test Specimen
average of the values for the last 30 min of measurement (that
7.1 For measurement alone, specimen size is unimportant
is, for the last 7 measurem
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

This May Also Interest You

ASTM
ASTM G67-24(Test Method)
Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)

SIGNIFICANCE AND USE
4.1 This test method provides a quantitative measure of the susceptibility to intergranular corrosion of Al-Mg and Al-Mg-Mn alloys. The nitric acid dissolves a second phase, an aluminum-magnesium intermetallic compound (βAl-Mg), in preference to the solid solution of magnesium in the aluminum matrix. When this compound is precipitated in a relatively continuous network along grain boundaries, the effect of the preferential attack is to corrode around the grains, causing them to fall away from the specimens. Such dropping out of the grains causes relatively large mass losses of the order of 25 mg/cm2  to 75 mg/cm2  (160 mg/in.2 to 480 mg/in.2), whereas, samples of intergranular-resistant materials lose only about 1 mg/cm2 to 15 mg/cm2 (10 mg/in.2 to 100 mg/in.2). When the βAl-Mg compound is randomly distributed, the preferential attack can result in intermediate mass losses. Metallographic examination is required in such cases to establish whether or not the loss in mass is the result of intergranular attack.  
4.2 The precipitation of the second phase in the grain boundaries also gives rise to intergranular corrosion when the material is exposed to chloride-containing natural environments, such as seacoast atmospheres or sea water. The extent to which the alloy will be susceptible to intergranular corrosion depends upon the degree of precipitate continuity in the grain boundaries. Visible manifestations of the attack may be in various forms such as pitting, exfoliation, or stress-corrosion cracking, depending upon the morphology of the grain structure and the presence of sustained tensile stress.3
SCOPE
1.1 This test method, also known as the Nitric Acid Mass Loss Test (NAMLT), covers a procedure for constant immersion intergranular corrosion testing of 5XXX series aluminum alloys.  
1.2 This test method is applicable only to wrought products.  
1.3 This test method covers type of specimen, specimen preparation, test environment, and method of exposure.  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    5 pages
    English language
    sale 15% off
  • Standard
    5 pages
    English language
    sale 15% off
ASTM
ASTM G103-97(2023)e1(Practice)
Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 % Sodium Chloride Solution

SIGNIFICANCE AND USE
4.1 This practice is normally used for stress-corrosion screening for the development of Al-Zn-Mg-Cu alloys containing less than 0.26 % copper. Effects on stress-corrosion resistance due to variables such as composition, thermo-mechanical processing, other fabrication variables, and magnitude of applied stress may be compared.  
4.2 For a given mechanical method of stressing, the relative stress-corrosion resistance of the low copper Al-Zn-Mg-Cu alloys in atmospheric exposure correlates better with performance in boiling 6 % sodium chloride solution than with other accelerated testing media (7-9). In addition, this practice is relatively rapid.  
4.3 This practice is not applicable to 2XXX (Al-Cu), 5XXX (Al-Mg), 6XXX (Al-Mg-Si), and the 7XXX (Al-Zn-Mg-Cu) series alloys containing more than 1.2 % copper.  
4.3.1 For 7XXX series alloys containing between 0.26 % and 1.2 % copper, there is no general agreement as to whether this practice or Practice G44 correlates better with stress-corrosion resistance in service (5-8, 10).
SCOPE
1.1 This practice primarily covers the test medium which may be used with a variety of test specimens and methods of applying stress. Exposure times, criteria of failure, and so on, are variable and not specified.  
1.2 This stress-corrosion testing practice is intended for statically loaded smooth non-welded or welded specimens of 7XXX series Al-Zn-Mg-Cu alloys containing less than 0.26 % copper.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Section 8 for additional precautions.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    4 pages
    English language
    sale 15% off
ASTM
ASTM G110-92(2022)e2(Practice)
Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution

SIGNIFICANCE AND USE
4.1 This practice is especially useful for evaluating the adequacy of quenching when performed on material in the as-quenched condition. The practice may also be used to study the effect of subsequent thermal processes (for example, paint or bonding cures) or of actual precipitation treatments on the inherent type of corrosion. Intergranular corrosion resistance of heat treatable aluminum alloys is often directly related to the quenching conditions applied after solution heat treatment and to the subsequent aging treatment.4  
4.2 This practice is not well suited for non-heat treatable work hardening aluminum alloys, such as the 1XXX, 3XXX, and 5XXX series (see Test Method G67).  
4.3 This practice does not deal with the interpretation of resulting intergranular corrosion. The significance of the extent and depth of any intergranular corrosion resulting from this test is to be agreed upon between producer and user.
SCOPE
1.1 This practice covers the procedures for immersion tests in sodium chloride + hydrogen peroxide solution. It is primarily for tests of wrought heat treatable aluminum alloys (2XXX and 7XXX) but may be used for other aluminum alloys, including castings. It sets forth the specimen preparation procedures and the environmental conditions of the test and the means for controlling them.  
1.2 This practice is intended for evaluations during alloy development and for evaluating production where it may serve as a control test on the quality of successive lots of the same material (see MIL-H-6088 and U.S. Federal Test Method Std. 151b). Therefore strict test conditions are stipulated for maximum assurance that variations in results are attributable to lot-to-lot differences in the material being tested.
Note 1: This practice does not address sampling or interpretation or significance of results.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    3 pages
    English language
    sale 15% off
ASTM
ASTM G112-22(Guide)
Standard Guide for Conducting Exfoliation Corrosion Tests in Aluminum Alloys

SIGNIFICANCE AND USE
4.1 Although there are ASTM test methods for exfoliation testing, they concentrate on specific procedures for test methodology itself. Existent test methods do not discuss material variables that can affect performance. Likewise they do not address the need to establish the suitability of an accelerated test for alloys never previously tested nor the need to correlate results of accelerated tests with tests in outdoor atmospheres and with end-use performance.  
4.2 This guide is a compilation of the experience of investigators skilled in the art of conducting exfoliation tests and assessing the degree and significance of the damage encountered. The focus is on two general aspects: guides to techniques that will enhance the likelihood of obtaining reliable information, and tips and procedures to avoid pitfalls that could lead to erroneous results and conclusions.  
4.3 The following three areas of testing are considered: the test materials starting with the “as-received” sample up through final specimen preparation, the corrosion test procedures including choice of test, inspection periods, termination point, and rating procedures, and analyses of results and methods for reporting them.  
4.4 This guide is not intended as a specific corrosion test procedure by which to evaluate the resistance to exfoliation of an aluminum alloy product.  
4.5 This guide is not intended as a basis for specifications, nor as a guide for material lot acceptance.
SCOPE
1.1 This guide differs from the usual ASTM standard in that it does not address a specific test. Rather, it is an introductory guide for new users of various standard exfoliation test methods with consideration for specific aluminum alloy families (see Terminology G193 for definition of exfoliation).  
1.2 This guide covers aspects of specimen preparation, exposure, inspection, and evaluation for conducting exfoliation tests on aluminum alloys in both laboratory accelerated environments and in natural, outdoor atmospheres. The intent is to clarify any gaps in existent test methods.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    8 pages
    English language
    sale 15% off
  • Guide
    8 pages
    English language
    sale 15% off
ASTM
ASTM G64-99(2021)(Classification)
Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum Alloys

SIGNIFICANCE AND USE
4.1 This classification involves alphabetical ratings intended only to provide a qualitative guide for materials selection. The ratings are based primarily on the results of standard corrosion tests.  
4.2 Interpretations of the SCC ratings in terms of typical problem areas including service experience are given in Table 1. Practical experience has shown that SCC problems with aluminum alloys generally have involved situations where the direction and magnitude of the tensile stresses resulting from manufacturing or use, or both, of the material were not recognized. (A) The sum of all stresses including those from service loads (applied), heat treatment, straightening, forming, and so forth.  
4.3 A list of the SCC ratings for the heat-treatable aluminum alloy products is given in Table 2. Revisions to the table will be required as new materials become available and additional test results are accumulated. (A) The ratings apply to standard mill products in the types of tempers indicated, including stress-relieved tempers, and could be invalidated in some cases by application of nonstandard thermal treatments or mechanical deformation at room temperature by the user.(B) Test direction refers to orientation of the stressing direction relative to the directional grain structure typical of wrought materials, which in the case of extrusions and forgings may not be predictable from the geometrical cross section of the product.
L — Longitudinal: parallel to direction of principal metal extension during manufacture of the product.
LT—Long Transverse: perpendicular to direction of principal metal extension. In products whose grain structure clearly shows directionality (width-to-thickness ratio greater than two) it is that perpendicular direction parallel to the major grain dimension.
ST—Short Transverse: perpendicular to direction of principal metal extension and parallel to minor dimension of grains in products with significant grain directionality.(C) Sections wit...
SCOPE
1.1 This classification covers alphabetical ratings of the relative resistance to SCC of various mill product forms of the wrought 2XXX, 6XXX, and 7XXX series heat-treated aluminum alloys and the procedure for determining the ratings.  
1.2 The ratings do not apply to metal in which the metallurgical structure has been altered by welding, forming, or other fabrication processes.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    4 pages
    English language
    sale 15% off
ASTM
ASTM G69-20(Test Method)
Standard Test Method for Measurement of Corrosion Potentials of Aluminum Alloys

SIGNIFICANCE AND USE
3.1 The corrosion potential of an aluminum alloy depends upon the amounts of certain alloying elements that the alloy contains in solid solution. Copper and zinc, which are two of the major alloying elements for aluminum, have the greatest effect with copper shifting the potential in the noble or positive direction, and zinc in the active or negative direction. For example, commercially unalloyed aluminum (1100 alloy) has a potential of –750 mV when measured in accordance with this method, 2024–T3 alloy with nearly all of its nominal 4.3 % copper in solid solution, a potential of –600 mV to –620 mV, depending upon the rate of quenching and 7072 alloy with nearly all of its nominal 1.0 % zinc in solid solution, a potential of –885 mV (SCE) (1-3).3  
3.2 Because it reflects the amount of certain alloying elements in solid solution, the corrosion potential is a useful tool for characterizing the metallurgical condition of aluminum alloys, especially those of the 2XXX and 7XXX types, which contain copper and zinc as major alloying elements. Its uses include the determination of the effectiveness of solution heat treatment and annealing (1), of the extent of precipitation during artificial aging (4) and welding (5), and of the extent of diffusion of alloying elements from the core into the cladding of Alclad products (2).
SCOPE
1.1 This test method covers a procedure for measurement of the corrosion potential (see Note 1) of an aluminum alloy in an aqueous solution of sodium chloride with enough hydrogen peroxide added to provide an ample supply of cathodic reactant.
Note 1: The corrosion potential is sometimes referred to as the open-circuit solution or rest potential. See Terminology G193.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    5 pages
    English language
    sale 15% off
  • Standard
    5 pages
    English language
    sale 15% off
ASTM
ASTM B998-17(2024)(Guide)
Standard Guide for Hot Isostatic Pressing (HIP) of Aluminum Alloy Castings

SIGNIFICANCE AND USE
4.1 HIP of castings should be performed in the as cast condition. Post HIP inspection of castings should result in a reduction of porosity that is evident in x-ray grade and properties.  
4.2 HIP will not eliminate inclusions or surface-connected porosity in a casting.
SCOPE
1.1 This guide covers requirements for hot isostatic pressing (HIP) of aluminum alloy castings. HIPing is a process in which components are subjected to the simultaneous application of heat and high pressure in an inert gas medium. The process is to be used for the reduction of internal (non-surface connected) porosity. The document is to describe the general parameters of the HIP process, describe certification procedures and a description that the process has been followed. It is not intended to be a description of a heat treating procedure. This is not meant to supersede an end user’s specification where one exists.2  
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    4 pages
    English language
    sale 15% off
ASTM
ASTM G67-24(Test Method)
Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)

SIGNIFICANCE AND USE
4.1 This test method provides a quantitative measure of the susceptibility to intergranular corrosion of Al-Mg and Al-Mg-Mn alloys. The nitric acid dissolves a second phase, an aluminum-magnesium intermetallic compound (βAl-Mg), in preference to the solid solution of magnesium in the aluminum matrix. When this compound is precipitated in a relatively continuous network along grain boundaries, the effect of the preferential attack is to corrode around the grains, causing them to fall away from the specimens. Such dropping out of the grains causes relatively large mass losses of the order of 25 mg/cm2  to 75 mg/cm2  (160 mg/in.2 to 480 mg/in.2), whereas, samples of intergranular-resistant materials lose only about 1 mg/cm2 to 15 mg/cm2 (10 mg/in.2 to 100 mg/in.2). When the βAl-Mg compound is randomly distributed, the preferential attack can result in intermediate mass losses. Metallographic examination is required in such cases to establish whether or not the loss in mass is the result of intergranular attack.  
4.2 The precipitation of the second phase in the grain boundaries also gives rise to intergranular corrosion when the material is exposed to chloride-containing natural environments, such as seacoast atmospheres or sea water. The extent to which the alloy will be susceptible to intergranular corrosion depends upon the degree of precipitate continuity in the grain boundaries. Visible manifestations of the attack may be in various forms such as pitting, exfoliation, or stress-corrosion cracking, depending upon the morphology of the grain structure and the presence of sustained tensile stress.3
SCOPE
1.1 This test method, also known as the Nitric Acid Mass Loss Test (NAMLT), covers a procedure for constant immersion intergranular corrosion testing of 5XXX series aluminum alloys.  
1.2 This test method is applicable only to wrought products.  
1.3 This test method covers type of specimen, specimen preparation, test environment, and method of exposure.  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    5 pages
    English language
    sale 15% off
  • Standard
    5 pages
    English language
    sale 15% off
ASTM
ASTM B317/B317M-23(Specification)
Standard Specification for Aluminum-Alloy Extruded Bar, Rod, Tube, Pipe, Structural Profiles, and Profiles for Electrical Purposes (Bus Conductor)

ABSTRACT
This specification covers 6101 aluminum-alloy extruded bar, rod, tube, pipe, (Schedules 40 and 80), structural profiles, and profiles in selected tempers for use as electric conductors. The bars, rods, tubes, pipes, structural profiles and profiles shall be produced by hot extrusion or by similar methods. Pipe or tube may be produced through porthole or bridge type dies. Tensile properties of the specimens such as tensile and yield strengths and bending shall be determined by tension test and bending test, respectively. Electrical resistivity and conductivity shall be determined.
SCOPE
1.1 This specification covers 6101 aluminum-alloy extruded bar, rod, tube, pipe, (Schedules 40 and 80), structural profiles, and profiles in selected tempers for use as electric conductors as follows:  
1.1.1 Type B—Hot-finished bar, rod, tube, pipe, structural profiles and profiles in T6, T61, T63, T64, T65, and H111 tempers with Type B tolerances, as shown in the “List of ANSI Tables of Dimensional Tolerances.”  
1.1.2 Type C—Hot-finished rectangular bar in T6, T61, T63, T64, T65, and H111 tempers with Type C tolerances as listed in the tolerances and permissible variations tables.  
1.2 Alloy and temper designations are in accordance with ANSI H35.1. The equivalent Unified Numbering System alloy designation in accordance with Practice E527 is A96101 for Alloy 6101.  
Note 1: Type A material, last covered in the 1966 issue of this specification, is no longer available; therefore, requirements for cold-finished rectangular bar have been deleted.  
1.3 The values stated in either SI or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
    8 pages
    English language
    sale 15% off
  • Technical specification
    8 pages
    English language
    sale 15% off
ASTM
ASTM B921-08(2023)(Specification)
Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys

ABSTRACT
This specification covers the requirements relating to rinsed and non-rinsed non-hexavalent chromium conversion coatings on aluminum and aluminum alloys intended to retard corrosion; as a base for organic films including paints, plastics, and adhesives; and as.a protective coating having a low electrical contact impedance. Coatings are categorized into four classes according to corrosion protection and finish. The type of conversion coating depends on the composition of the solution and may also be affected by pH, temperature, duration of the treatment, and the nature and surface condition. Films are normally applied by dipping, but may also be applied by inundation, spraying, roller coating, or by wipe-on techniques. Coatings shall adhere to specified electrical resistance, adhesion, and corrosion resistance requirements.
SCOPE
1.1 This specification covers the requirements relating to rinsed and non-rinsed non-hexavalent chromium conversion coatings on aluminum and aluminum alloys intended to give protection against corrosion and as a base for other coatings.  
1.2 Aluminum and aluminum alloys are conversion coated in order to retard corrosion; as a base for organic films including paints, plastics, and adhesives; and as a protective coating having a low electrical contact impedance.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory requirements prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
    3 pages
    English language
    sale 15% off