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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

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.

General Information

Status
Published
Publication Date
14-Jan-2023
ICS
77.120.10 - Aluminium and aluminium alloys
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.06 - Environmentally Assisted Cracking
Current Stage
Ref Project

Relations

Refers
ASTM G58-85(2023) - Standard Practice for Preparation of Stress-Corrosion Test Specimens for Weldments
Effective Date
01-Dec-2023
Refers
ASTM G49-85(2023)e1 - Standard Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens
Effective Date
01-Nov-2023
Refers
ASTM B580-79(2019) - Standard Specification for Anodic Oxide Coatings on Aluminum
Effective Date
01-Apr-2019
Refers
ASTM G58-85(2015) - Standard Practice for Preparation of Stress-Corrosion Test Specimens for Weldments
Effective Date
01-Nov-2015
Refers
ASTM G30-97(2015) - Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens
Effective Date
01-Nov-2015
Refers
ASTM B580-79(2014) - Standard Specification for Anodic Oxide Coatings on Aluminum
Effective Date
01-Nov-2014
Refers
ASTM G39-99(2011) - Standard Practice for Preparation and Use of Bent-Beam Stress-Corrosion Test Specimens
Effective Date
01-Mar-2011
Refers
ASTM G58-85(2011) - Standard Practice for Preparation of Stress-Corrosion Test Specimens for Weldments
Effective Date
01-Mar-2011
Refers
ASTM G30-97(2009) - Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens
Effective Date
01-May-2009
Refers
ASTM B580-79(2009) - Standard Specification for Anodic Oxide Coatings on Aluminum
Effective Date
15-Apr-2009
Refers
ASTM G38-01(2007) - Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
Effective Date
01-May-2007
Refers
ASTM D1193-06 - Standard Specification for Reagent Water
Effective Date
01-Mar-2006
Refers
ASTM G49-85(2005) - Standard Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens
Effective Date
01-Oct-2005
Refers
ASTM G44-99(2005) - Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5% Sodium Chloride Solution
Effective Date
01-May-2005
Refers
ASTM G58-85(2005) - Standard Practice for Preparation of Stress-Corrosion Test Specimens for Weldments
Effective Date
01-May-2005

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ASTM G103-97(2023)e1 - Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 % Sodium Chloride SolutionASTM G103-97(2023)e1 - Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 % Sodium Chloride Solution
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ASTM G103-97(2023)e1 - Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 % Sodium Chloride Solution
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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.
´1
Designation: G103 − 97 (Reapproved 2023)
Standard Practice for
Evaluating Stress-Corrosion Cracking Resistance of Low
Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 %
Sodium Chloride Solution
This standard is issued under the fixed designation G103; 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 (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—Ref (9) was updated editorially, and other editorial changes were made throughout in January 2023.
INTRODUCTION
Continuous immersion in boiling 6 % sodium chloride solution historically was considered to be an
effective accelerated SCC testing medium for all Al-Zn-Mg-Cu alloys (1, 2), but in more recent years,
alternate immersion in 3.5 % sodium chloride solution (Practice G44) has become the favored test
medium for the high copper (1.2 % to 2.6 % Cu) 7XXX series alloys (3, 4). Evidence to date shows,
however, that the boiling 6 % sodium chloride medium correlates better with outdoor atmospheric
exposure than Practice G44 for the 7XXX series alloys containing little or no copper (5, 6, 7, 8).
1. Scope 1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This practice primarily covers the test medium which
ization established in the Decision on Principles for the
may be used with a variety of test specimens and methods of
Development of International Standards, Guides and Recom-
applying stress. Exposure times, criteria of failure, and so on,
mendations issued by the World Trade Organization Technical
are variable and not specified.
Barriers to Trade (TBT) Committee.
1.2 This stress-corrosion testing practice is intended for
2. Referenced Documents
statically loaded smooth non-welded or welded specimens of
7XXX series Al-Zn-Mg-Cu alloys containing less than 0.26 %
2.1 ASTM Standards:
copper.
B580 Specification for Anodic Oxide Coatings on Alumi-
num
1.3 The values stated in inch-pound units are to be regarded
D1193 Specification for Reagent Water
as standard. The values given in parentheses are mathematical
G30 Practice for Making and Using U-Bend Stress-
conversions to SI units that are provided for information only
Corrosion Test Specimens
and are not considered standard.
G38 Practice for Making and Using C-Ring Stress-
1.4 This standard does not purport to address all of the
Corrosion Test Specimens
safety concerns, if any, associated with its use. It is the
G39 Practice for Preparation and Use of Bent-Beam Stress-
responsibility of the user of this standard to establish appro-
Corrosion Test Specimens
priate safety, health, and environmental practices and deter-
G44 Practice for Exposure of Metals and Alloys by Alternate
mine the applicability of regulatory limitations prior to use.
Immersion in Neutral 3.5 % Sodium Chloride Solution
See Section 8 for additional precautions.
G49 Practice for Preparation and Use of Direct Tension
Stress-Corrosion Test Specimens
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion G58 Practice for Preparation of Stress-Corrosion Test Speci-
of Metals and is the direct responsibility of Subcommittee G01.06 on Environmen-
mens for Weldments
tally Assisted Cracking.
Current edition approved Jan. 15, 2023. Published February 2023. Originally
approved in 1989. Last previous edition approved in 2016 as G103 – 97 (2016). For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/G0103-97R23E01. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
The boldface numbers in parentheses refer to the list of references at the end of Standards volume information, refer to the standard’s Document Summary page on
this standard. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
G103 − 97 (2023)
3. Summary of Practice 4.3.1 For 7XXX series alloys containing between 0.26 %
and 1.2 % copper, there is no general agreement as to whether
3.1 Stressed specimens are totally and continuously im-
this practice or Practice G44 correlates better with stress-
mersed in boiling 6 % sodium chloride solution for up to 168 h.
corrosion resistance in service (5-8, 10).
Various types of smooth test specimens and methods of
stressing may be used. Performance is based on time to visual
5. Apparatus
cracking.
5.1 Fig. 1 illustrates one type of apparatus that has been
4. Significance and Use
used.
4.1 This practice is normally used for stress-corrosion
5.2 Materials of Construction:
screening for the development of Al-Zn-Mg-Cu alloys contain-
5.2.1 Materials of construction that come in contact with the
ing less than 0.26 % copper. Effects on stress-corrosion resis-
boiling salt solution shall be such that they are not affected by
tance due to variables such as composition, thermo-mechanical
the corrodent to an extent that they can cause contamination of
processing, other fabrication variables, and magnitude of
the solution and change its corrosiveness.
applied stress may be compared.
5.2.2 Use of glass or aluminum containers and condensers is
4.2 For a given mechanical method of stressing, the relative
recommended.
stress-corrosion resistance of the low copper Al-Zn-Mg-Cu
5.2.3 Metallic materials of construction should be limited to
alloys in atmospheric exposure correlates better with perfor-
copper free aluminum alloys, which may be anodized to
mance in boiling 6 % sodium chloride solution than with other
provide electrical contact resistance.
accelerated testing media (7-9). In addition, this practice is
relatively rapid.
5.3 Specimen Holders—The specimen holders should be
4.3 This practice is not applicable to 2XXX (Al-Cu), 5XXX designed to electrically insulate the specimens from each other
(Al-Mg), 6XXX (Al-Mg-Si), and the 7XXX (Al-Zn-Mg-Cu) and from other bare metal. An anodized aluminum holder has
series alloys containing more than 1.2 % copper. been found to be appropriate. (Satisfactory anodic coating may
U bend specimens (Practice G39) stressed in an anodized aluminum fixture (right photo) are placed in a pyrex battery jar (left photo), which is placed over a mag-
netic stirrer. The 6 % salt solution is heated to boiling by means of two quartz immersion heaters. A powerstat controls the heat output of the quartz heaters. A cold
water circulating aluminum condenser tube is placed just below the aluminum cover to prevent evaporation losses. Stressed specimens are placed in the jar after the
solution comes to a boil. Specimens are examined in place for visual evidence of cracking.
FIG. 1 Boiling 6 % NaCl—Stress-Corrosion Testing Practice
´1
G103 − 97 (2023)
be Type A or B, Specification B580.) Periodic ohmeter checks method of stressing the specimens should be reproducible and
may be made to confirm electrical isolation of specimen and in accordance to standard procedures for the type of specimen
anodized holder. selected.
5.4 Heater for Solution: 7.3 Surface Preparation—The specimen surface should be
free of oil, grease, and dirt. This usually entails cleaning with
5.4.1 Heaters must be of sufficient capacity that boiling
organic solvents such as alcohol or acetone.
temperature can be maintained and solu
...

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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
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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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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.

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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.

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  • Technical specification
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ASTM
ASTM B648-23(Test Method)
Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor

SIGNIFICANCE AND USE
4.1 The Barcol Impressor is portable and therefore useful for in situ determination of the hardness of fabricated parts and individual test specimens for production control purposes.  
4.2 This test method should be used only as cited in applicable material specifications.
SCOPE
1.1 This test method covers the determination of indentation hardness of aluminum alloys using a Barcol Impressor.  
1.2 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.  
1.2.1 Some Barcol Impressors are for use on plastics and are not included in this test method and should not be used for aluminum alloys.  
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.

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  • Standard
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    English language
    sale 15% off