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ASTM G110-92(1997)

(Practice)

Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution

Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution

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 This standard does not purport to address all of the safety problems, 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
G01.05 - Laboratory Corrosion Tests
Current Stage
Ref Project

Relations

Replaced By
ASTM G110-92(2003)e1 - Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
Effective Date
01-Oct-2003
Referred By
ASTM B917/B917M-12(2020) - Standard Practice for Heat Treatment of Aluminum-Alloy Castings From All Processes
Effective Date
10-Oct-1997
Referred By
ASTM G31-21 - Standard Guide for Laboratory Immersion Corrosion Testing of Metals
Effective Date
10-Oct-1997

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ASTM G110-92(1997) - Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide SolutionASTM G110-92(1997) - Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
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ASTM G110-92(1997) - Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: G 110 – 92 (Reapproved 1997)
Standard Practice for
Evaluating Intergranular Corrosion Resistance of Heat
Treatable Aluminum Alloys by Immersion in Sodium
Chloride + Hydrogen Peroxide Solution
This standard is issued under the fixed designation G 110; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope by Mass Loss After Exposure to Nitric Acid (NAMLT
Test)
1.1 This practice covers the procedures for immersion tests
G 69 Practice for Measurement of Corrosion Potentials of
in sodium chloride + hydrogen peroxide solution. It is prima-
Aluminum Alloys
rily for tests of wrought heat treatable aluminum alloys (2XXX
2.2 Other Documents:
and 7XXX) but may be used for other aluminum alloys,
U.S. Military Specification MIL-H-6088, Heat Treatment of
including castings. It sets forth the specimen preparation
Aluminum Alloys
procedures and the environmental conditions of the test and the
U.S. Federal Test Method, Standard No.
means for controlling them.
151b, Method 822.1, Intergranular Corrosion Test for
1.2 This practice is intended for evaluations during alloy
Aluminum Alloys
development and for evaluating production where it may serve
as a control test on the quality of successive lots of the same
3. Summary of Practice
material (see MIL-H-6088 and U.S. Federal Test Method Std.
3.1 This practice consists of immersing etched test speci-
151b). Therefore strict test conditions are stipulated for maxi-
mens in a sodium chloride + hydrogen peroxide solution for 6
mum assurance that variations in results are attributable to
or more hours. After immersion metallographic sections are
lot-to-lot differences in the material being tested.
examined to determine extent of intergranular corrosion (see
NOTE 1—This practice does not address sampling or interpretation or
Terminology G 15).
significance of results.
4. Significance and Use
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.1 This practice is especially useful for evaluating the
responsibility of the user of this standard to establish appro-
adequacy of quenching when performed on material in the
priate safety and health practices and determine the applica- as-quenched condition. The practice may also be used to study
bility of regulatory limitations prior to use.
the effect of subsequent thermal processes (for example, paint
or bonding cures) or of actual precipitation treatments on the
2. Referenced Documents
inherent type of corrosion. Intergranular corrosion resistance of
2.1 ASTM Standards:
heat treatable aluminum alloys is often directly related to the
D 1193 Specification for Reagent Water
quenching conditions applied after solution heat treatment and
E 3 Methods of Preparation of Metallographic Specimens
to the subsequent aging treatment.
E 407 Test Methods for Microetching Metals and Alloys
4.2 This practice is not well suited for non-heat treatable
G 1 Practice for Preparing, Cleaning, and Evaluating Cor-
work hardening aluminum alloys, such as the 1XXX, 3XXX,
rosion Test Specimens
and 5XXX series (see Test Method G 67).
G 15 Terminology Relating to Corrosion and Corrosion
4.3 This practice does not deal with the interpretation of
Testing
resulting intergranular corrosion. The significance of the extent
G 67 Test Method for Determining the Susceptibility to
and depth of any intergranular corrosion resulting from this test
Intergranular Corrosion of 5XXX Series Aluminum Alloys
is to be agreed upon between producer and user.
5. Reagents
5.1 Reagent grade chemicals [sodium chloride (NaCl), 70 %
This practice is under the jurisdiction of ASTM Committee G-1 on Corrosion
of Metals and is the direct responsibility of Subcommittee G01.05on Laboratory
Corrosion Tests. Available from Standardization Documents Order Desk, Building 4, Section D,
Current edition approved June 15, 1992. Published September 1992. 700 Robbins Avenue, Philadelphia, PA 19111-5094.
2 6
Annual Book of ASTM Standards, Vol 11.01. Lifka, B. W., and Sprowls, D. O., “Significance of Intergranular Corrosion of
Annual Book of ASTM Standards, Vol 03.01. High Strength Aluminum Alloy Products,” Localized Corrosion Cause of Metal
Annual Book of ASTM Standards, Vol 03.02. Failure, ASTM STP 516 (1972), pp. 120–144.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
G110
nitric acid (HNO ), 48 % hydrofluoric acid (HF), 37 % hydro- 8.3 Specimens shall be prevented from contacting the bot-
chloric acid (HCl), and 30 % hydrogen peroxide (H O )] shall tom of the test vessel by placing the specimens on glass rods or
2 2
be used for preparation of all solutions. rubber stoppers. (Rubber stoppers may be deteriorated by
5.2 The solutions shall be prepared using distilled or deion- hydrogen peroxide.)
ized water conforming to the purity requirements for Specifi- 8.4 The exposure shall be conducted at a temperature of 30
cation D 1193, Type IV reagent water. 6 3°C.
6. Solutions 9. Procedure
6.1 Etching cleaner shall be prepared as follows: To 945 mL 9.1 Immerse the etched specimens in the test solution for a
of reagent water add 50 mL of nitric acid (70 %) + 5 mL of period of at least 6 h. Longer exposure periods of 24 hours or
hydrofluoric acid (48 %). (See Note 2). more may be
...

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ASTM G67-24(Test Method)
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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
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ASTM G103-97(2023)e1(Practice)
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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.  
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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).
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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.  
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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).  
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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.
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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.

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ABSTRACT
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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
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  • Technical specification
    8 pages
    English language
    sale 15% off