ASTM G47-22

Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products

SIGNIFICANCE AND USE
4.1 The 3.5 % NaCl solution alternate immersion test provides a test environment for detecting materials that would be likely to be susceptible to SCC in natural outdoor environments, especially environments with marine influences.3,4,5 For determining actual serviceability of a material, other stress-corrosion tests should be performed in the intended service environment under conditions relating to the end use, including protective measures.  
4.2 Although this test method is intended for certain alloy types and for testing products primarily in the short-transverse stressing direction, this method is useful for some other types of alloys and stressing directions.
SCOPE
1.1 This test method covers a uniform procedure for characterizing the resistance to stress-corrosion cracking (SCC) of high-strength aluminum alloy wrought products for the guidance of those who perform stress-corrosion tests, for those who prepare stress-corrosion specifications, and for materials engineers.  
1.2 This test method covers method of sampling, type of specimen, specimen preparation, test environment, and method of exposure for determining the susceptibility to SCC of 2XXX (with 1.8 % to 7.0 % copper) and 7XXX (with 0.4 % to 2.8 % copper) aluminum alloy products, particularly when stressed in the short-transverse direction relative to the grain structure.  
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.

General Information

• Status: Published
• Publication Date: 30-Nov-2022
• ICS: 77.040.30 - Chemical analysis of metals
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.06 - Environmentally Assisted Cracking

Standards Content (Sample)

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.
Designation: G47 − 22
Standard Test Method for
Determining Susceptibility to Stress-Corrosion Cracking of
1
2XXX and 7XXX Aluminum Alloy Products
This standard is issued under the fixed designation G47; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope G38 Practice for Making and Using C-Ring Stress-
Corrosion Test Specimens
1.1 This test method covers a uniform procedure for char-
G44 PracticeforExposureofMetalsandAlloysbyAlternate
acterizing the resistance to stress-corrosion cracking (SCC) of
Immersion in Neutral 3.5 % Sodium Chloride Solution
high-strength aluminum alloy wrought products for the guid-
G49 Practice for Preparation and Use of Direct Tension
anceofthosewhoperformstress-corrosiontests,forthosewho
Stress-Corrosion Test Specimens
prepare stress-corrosion specifications, and for materials engi-
G139 Test Method for Determining Stress-Corrosion Crack-
neers.
ing Resistance of Heat-Treatable Aluminum Alloy Prod-
1.2 This test method covers method of sampling, type of
ucts Using Breaking Load Method
specimen, specimen preparation, test environment, and method
ofexposurefordeterminingthesusceptibilitytoSCCof2XXX
3. Summary of Test Method
(with 1.8 % to 7.0 % copper) and 7XXX (with 0.4 % to 2.8 %
3.1 This test method provides a comprehensive procedure
copper) aluminum alloy products, particularly when stressed in
foracceleratedstress-corrosiontestinghigh-strengthaluminum
the short-transverse direction relative to the grain structure.
alloy product forms, particularly when stressed in the short-
1.3 The values stated in SI units are to be regarded as
transverse grain direction. It specifies tests of constant-strain-
standard. The values given in parentheses after SI units are
loaded, 3.18 mm (0.125 in.) tension specimens or C-rings
provided for information only and are not considered standard.
exposed to 3.5 % sodium chloride (NaCl) solution by alternate
1.4 This standard does not purport to address all of the immersion, and includes procedures for sampling various
safety concerns, if any, associated with its use. It is the manufactured product forms, examination of exposed test
responsibility of the user of this standard to establish appro-
specimens, and interpretation of test results.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. 4. Significance and Use
1.5 This international standard was developed in accor-
4.1 The 3.5 % NaCl solution alternate immersion test pro-
dance with internationally recognized principles on standard-
vides a test environment for detecting materials that would be
ization established in the Decision on Principles for the
likely to be susceptible to SCC in natural outdoor
Development of International Standards, Guides and Recom-
environments, especially environments with marine
3,4,5
mendations issued by the World Trade Organization Technical
influences. For determining actual serviceability of a
Barriers to Trade (TBT) Committee.
material, other stress-corrosion tests should be performed in
the intended service environment under conditions relating to
2. Referenced Documents
the end use, including protective measures.
2
2.1 ASTM Standards:
1 3
This test method, which was developed by a joint task group with the Romans, H. B., Stress Corrosion Testing, ASTM STP 425, ASTM, 1967, pp.
AluminumAssociation, Inc., is under the jurisdiction ofASTM Committee G01 on 182–208.
4
Corrosion of Metals and is the direct responsibility of Subcommittee G01.06 on Brown, R. H., Sprowls, D. O., and Shumaker, M. B., “The Resistance of
Environmentally Assisted Cracking. Wrought High Strength Aluminum Alloys to Stress Corrosion Cracking,” Stress
Current edition approved Dec. 1, 2022. Published January 2023. Originally CorrosionCrackingofMetals—AStateoftheArt,ASTMSTP518,ASTM,1972,pp.
approved in 1976. Last previous edition approved in 2020 as G47–20. DOI: 87–118.
5
10.1520/G0047-22. Sprowls, D. O., Summerson, T. J., Ugiansky, G. M., Epstein, S. G., and Craig,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or H. L., Jr., “Evaluation of a Proposed Standard Method of Testing for Susceptibility
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM to Stress-Corrosion Cracking of High-Strength 7XXX Series Aluminum Alloy
Standards vol
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G47 − 20 G47 − 22
Standard Test Method for
Determining Susceptibility to Stress-Corrosion Cracking of
1
2XXX and 7XXX Aluminum Alloy Products
This standard is issued under the fixed designation G47; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This test method covers a uniform procedure for characterizing the resistance to stress-corrosion cracking (SCC) of
high-strength aluminum alloy wrought products for the guidance of those who perform stress-corrosion tests, for those who prepare
stress-corrosion specifications, and for materials engineers.
1.2 This test method covers method of sampling, type of specimen, specimen preparation, test environment, and method of
exposure for determining the susceptibility to SCC of 2XXX (with 1.8 % to 7.0 % copper) and 7XXX (with 0.4 % to 2.8 % copper)
aluminum alloy products, particularly when stressed in the short-transverse direction relative to the grain structure.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
G38 Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
G44 Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution
G49 Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens
G139 Test Method for Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using
Breaking Load Method
3. Summary of Test Method
3.1 This test method provides a comprehensive procedure for accelerated stress-corrosion testing high-strength aluminum alloy
1
This test method, which was developed by a joint task group with the Aluminum Association, Inc., is under the jurisdiction of ASTM Committee G01 on Corrosion of
Metals and is the direct responsibility of Subcommittee G01.06 on Environmentally Assisted Cracking.
Current edition approved May 1, 2020Dec. 1, 2022. Published May 2020January 2023. Originally approved in 1976. Last previous edition approved in 20192020 as
G47–98 (2019). –20. DOI: 10.1520/G0047-20.10.1520/G0047-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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G47 − 22
product forms, particularly when stressed in the short-transverse grain direction. It specifies tests of constant-strain-loaded, 3.18
mm (0.125 in.) tension specimens or C-rings exposed to 3.5 % sodium chloride (NaCl) solution by alternate immersion, and
includes procedures for sampling various manufactured product forms, examination of exposed test specimens, and interpretation
of test results.
4. Significance and Use
4.1 The 3.5 % NaCl solution alternate immersion test provides a test environment for detecting materials that would be likely to
3,4,5
be susceptible to SCC in natural outdoor environments, especially environments with marine influences. For determining actual
serviceability of a material, other stress-corrosion tests should be performed in the intended service environment under conditions
relating to the end use, including protective measures.
4.2 Although this test method is intended for certain alloy types and for tes
...