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ASTM G64-99(2005)

(Classification)

Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum Alloys

Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum Alloys

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 the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-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 G64-99 - Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum Alloys
Effective Date
01-May-2005
Referred By
ASTM E1997-15(2021) - Standard Practice for the Selection of Spacecraft Materials
Effective Date
01-May-2005
Referred By
ASTM G139-05(2022) - Standard Test Method for Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using Breaking Load Method
Effective Date
01-May-2005

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ASTM G64-99(2005) - Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum AlloysASTM G64-99(2005) - Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum Alloys
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ASTM G64-99(2005) - Standard Classification of Resistance to Stress-Corrosion Cracking of Heat-Treatable Aluminum Alloys
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:G64 −99(Reapproved2005)
Standard Classification of
Resistance to Stress-Corrosion Cracking of Heat-Treatable
1
Aluminum Alloys
ThisstandardisissuedunderthefixeddesignationG64;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
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.
INTRODUCTION
Stresscorrosionbehaviorisanimportantcharacteristictobeconsideredwhenoptimizingthechoice
of material for an engineering structure. Unfortunately, there is no generally accepted scale for
measuring it, and stress corrosion tendencies are difficult to define because of the complex
interdependence of the material, tensile stress, environment, and time. Conventional test-dependent
types of laboratory stress corrosion data have only very limited applicability in mathematical models
used for materials selection.
This standard is intended to provide a qualitative classification of the relative resistance to stress
corrosion cracking (SCC) of high-strength aluminum alloys to assist in the selection of materials. The
classification is based on a combination of service experience and a widely accepted laboratory
corrosion test.
It is cautioned, however, that any such generalized classification of alloys can involve an
oversimplification in regard to their behavior in unusual environments. Moreover, the quantitative
prediction of the service performance of a material in a specific situation is outside the scope of this
standard.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This classification covers alphabetical ratings of the
G44 PracticeforExposureofMetalsandAlloysbyAlternate
relative resistance to SCC of various mill product forms of the
2
Immersion in Neutral 3.5 % Sodium Chloride Solution
wrought 2XXX, 6XXX, and 7XXX series heat-treated alumi-
G47 Test Method for Determining Susceptibility to Stress-
num alloys and the procedure for determining the ratings.
Corrosion Cracking of 2XXX and 7XXX Aluminum
1.2 The ratings do not apply to metal in which the metal- Alloy Products
lurgical structure has been altered by welding, forming, or 2.2 Other Documents:
MIL-HANDBOOK-5 Metallic Materials and Elements for
other fabrication processes.
3
Aerospace Vehicle Structures
1.3 The values stated in SI units are to be regarded as the
MIL-STD-1568 Materials and Processes for Corrosion Pre-
3
standard. The values given in parentheses are for information
vention and Control in Aerospace Systems
only.
MSFC-SPEC-522A Design Criteria for Controlling Stress
4
Corrosion Cracking
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1
This classification is under the jurisdiction of ASTM Committee G01 on Standards volume information, refer to the standard’s Document Summary page on
Corrosion of Metals and is the direct responsibility of Subcommittee G01.06 on the ASTM website.
3
Environmentally Assisted Cracking. Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Current edition approved May 1, 2005. Published May 2005. Originally Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098
4
approved in 1980. Last previous edition approved in 1999 as G64 – 99. DOI: Available from NationalAeronautics and SpaceAdministration (NASA), 300 E
10.1520/G0064-99R05. St. SW, Washington, D.C.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G64−99(2005)
TABLE 1 Practical Interpretation of Ratings for Resistance to SCC
NOTE 1—The stress levels mentioned below and the test stresses mentioned in 6.2 are not to be interpreted as “threshold” stresses, and are not
recommended for design. Other documents, such as MIL-HANDBOOK-5, MIL-STD-1568, NASC SD-24, and MSFC-SPEC-522A, should be consulted
for design recommendations.
Rating Interpretation
A
A Very high. SCC not anticipated in general applications if the total sustained tensile stress is less than 75 % of the minimum specified yield strength for
the alloy, heat treatment, product form, and orientation.
A
B High. SCC not anticipated if the total sustained tensile stress is less than 50 % of the minimum specified yield strength.
A
C Intermediate. SCC not anticipated if the total sustained tensile stress is less than 25 % of the minimum specified
...

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ASTM G110-92(2022)e2(Practice)
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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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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.  
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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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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.
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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.  
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This specification covers pigmented, sprayable, low volatile organic compound (VOC) corrosion-inhibiting adhesive primers for use on aluminum alloys that are to be adhesively bonded in the fabrication of panels for tactical or relocatable shelters. When applied to a properly prepared surface of aluminum alloy, the primer imparts corrosion resistance and forms a surface suitable for structural bonding and for coating with shelter paint finishes. The physical properties of uncured liquid polymer, cured film on primed surfaces, and bonded specimens shall conform to the prescribed requirements.
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1.1 This specification covers pigmented, sprayable, low volatile organic compound (VOC) corrosion-inhibiting adhesive primers for use on aluminum alloys that are to be adhesively bonded in the fabrication of panels for tactical shelters. When applied to a properly prepared surface of aluminum alloy, the primer imparts corrosion resistance and forms a surface suitable for structural bonding and for coating with shelter paint finishes.  
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