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ASTM G103-97(2005)

(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
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.
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.
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 G 44 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.
This standard may involve hazardous materials, operations, and equipment. 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. See Section for additional precautions.

General Information

Status
Historical
Publication Date
30-Sep-2005
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

Replaces
ASTM G103-97 - Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6% Sodium Chloride Solution
Effective Date
01-Oct-2005
Replaced By
ASTM G103-97(2011) - Standard Practice for Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6% Sodium Chloride Solution
Effective Date
01-Mar-2011
Referred By
ASTM G30-22 - Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens
Effective Date
01-Oct-2005

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ASTM G103-97(2005) - 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(2005) - 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(2005) - 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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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:G103–97 (Reapproved 2005)
Standard Practice for
Evaluating Stress-Corrosion Cracking Resistance of Low
Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6%
1
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.
INTRODUCTION
Continuous immersion in boiling 6 % sodium chloride solution historically was considered to be an
2
effectiveacceleratedSCCtestingmediumforallAl-Zn-Mg-Cualloys(1, 2), butinmorerecentyears,
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 mine the applicability of regulatory limitations prior to use.
See Section 8 for additional precautions.
1.1 This practice primarily covers the test medium which
may be used with a variety of test specimens and methods of
2. Referenced Documents
applying stress. Exposure times, criteria of failure, and so on,
3
2.1 ASTM Standards:
are variable and not specified.
B580 Specification for Anodic Oxide Coatings on Alumi-
1.2 This stress-corrosion testing practice is intended for
num
statically loaded smooth non-welded or welded specimens of
D1193 Specification for Reagent Water
7XXX seriesAl-Zn-Mg-Cu alloys containing less than 0.26 %
G30 Practice for Making and Using U-Bend Stress-
copper.
Corrosion Test Specimens
1.3 This standard may involve hazardous materials, opera-
G38 Practice for Making and Using C-Ring Stress-
tions, and equipment. This standard does not purport to
Corrosion Test Specimens
address all of the safety concerns, if any, associated with its
G39 Practice for Preparation and Use of Bent-Beam Stress-
use. It is the responsibility of the user of this standard to
Corrosion Test Specimens
establish appropriate safety and health practices and deter-
G44 Practice for Exposure of Metals and Alloys by Alter-
nate Immersion in Neutral 3.5 % Sodium Chloride Solu-
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion tion
of Metals and is the direct responsibility of Subcommittee G01.06 on Environmen-
tally Assisted Cracking.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
3
approved in 1989. Last previous edition approved in 1997 as G103 – 97. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/G0103-97R05. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
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

---------------------- Page: 1 ----------------------
G103–97 (2005)
G49 Practice for Preparation and Use of Direct Tension 4.3 This practice is not applicable to 2XXX (Al-Cu), 5XXX
Stress-Corrosion Test Specimens (Al-Mg), 6XXX (Al-Mg-Si), and the 7XXX (Al-Zn-Mg-Cu)
G58 Practice for Preparation of Stress-Corrosion Test series alloys containing more than 1.2 % copper.
Specimens for Weldments 4.3.1 For 7XXX series alloys containing between 0.26 %
and 1.2 % copper, there is no general agreement as to whether
3. Summary of Practice
this practice or Practice G44 correlates better with stress-
corrosion resistance in service (5-8, 10).
3.1 Stressed specimens are totally and continuously im-
mersed in boiling 6 % sodium chloride solution for up to 168
5. Apparatus
h. Various types of smooth test specimens and methods of
stressing may be used. Performance is based on time to visual
5.1 Fig. 1 illustrates one type of apparatus that has been
cracking.
used.
5.2 Materials of Construction:
4. Significance and Use
5.2.1 Materialsofconstructionthatcomeincontactwiththe
4.1 This practice is normally used for stress-corrosion boiling salt solution shall be such that they are not affected by
screening for the development ofAl-Zn-Mg-Cu alloys contain- the corrodent to an extent that they can cause contamination of
ing less than 0.26 % copper. Effects on stress-corrosion resis- the solution and change its corrosiveness.
tanceduetovariablessuchascomposition,thermo-mechanical 5.2.2 Useofglassoraluminumcontainersandcondensersis
processing, other fabrication variables,
...

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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

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.  
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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).
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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).  
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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

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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  
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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.  
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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...
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