ASTM G66-23
(Test Method)Standard Test Method for Visual Assessment of Exfoliation Corrosion Susceptibility of 5XXX Series Aluminum Alloys (ASSET Test)
Standard Test Method for Visual Assessment of Exfoliation Corrosion Susceptibility of 5XXX Series Aluminum Alloys (ASSET Test)
SIGNIFICANCE AND USE
5.1 This test method provides a reliable prediction of the exfoliation corrosion behavior of Al-Mg alloys in marine environments.4,5,6 The test is useful for alloy development studies and quality control of mill products such as sheet and plate.
SCOPE
1.1 This test method covers a procedure for continuous immersion exfoliation corrosion testing of 5XXX series aluminum-magnesium alloys containing 2.0 % or more magnesium.
1.2 This test method applies only to wrought products.
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, 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.
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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.
Designation: G66 − 23
Standard Test Method for
Visual Assessment of Exfoliation Corrosion Susceptibility of
1
5XXX Series Aluminum Alloys (ASSET Test)
This standard is issued under the fixed designation G66; 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.
1. Scope 3. Terminology
3.1 Definitions:
1.1 This test method covers a procedure for continuous
immersion exfoliation corrosion testing of 5XXX series 3.1.1 exfoliation corrosion, n—subsurface corrosion that
proceeds laterally from the sites of initiation along planes
aluminum-magnesium alloys containing 2.0 % or more mag-
nesium. parallel to the surface forming corrosion products that force
metal away from the body of the material, giving rise to a
1.2 This test method applies only to wrought products.
layered appearance resembling the pages of a book. (see
1.3 The values stated in SI units are to be regarded as the
Terminology G193).
standard. The values given in parentheses are for information
only.
4. Summary of Test Method
1.4 This standard does not purport to address all of the
4.1 Specimens are immersed for 24 h at 65 °C 6 1 °C
safety concerns, if any, associated with its use. It is the
(150 °F 6 2 °F) in a solution containing ammonium chloride,
responsibility of the user of this standard to establish appro-
ammonium nitrate, ammonium tartrate, and hydrogen perox-
priate safety, health, and environmental practices and deter-
ide. The susceptibility to exfoliation is determined by visual
mine the applicability of regulatory limitations prior to use.
examination using performance ratings established by refer-
1.5 This international standard was developed in accor-
ence to standard photographs.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Significance and Use
Development of International Standards, Guides and Recom-
5.1 This test method provides a reliable prediction of the
mendations issued by the World Trade Organization Technical
exfoliation corrosion behavior of Al-Mg alloys in marine
Barriers to Trade (TBT) Committee.
4,5,6
environments. The test is useful for alloy development
studies and quality control of mill products such as sheet and
2. Referenced Documents
plate.
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
6. Apparatus
G193 Terminology and Acronyms Relating to Corrosion
6.1 Any suitable glass or plastic container can be used to
2.2 ASTM Adjunct:
contain the solution and specimens during the test period.
ASSET Tested Specimens (2 figs, Fig. 1, 2; 8.5 × 11 in.)
Depending upon the shape and size of the specimens, rods or
3
PDF Download
racks of glass, plastic, or other inert substance shall be used to
support the specimens above the bottom of the container. The
container should be fitted with a removable cover to reduce
1
evaporation.
This test method is under the jurisdiction of ASTM Committee G01 on
Corrosion of Metals and is the direct responsibility of Subcommittee G01.05 on
Laboratory Corrosion Tests. This method was developed by a joint task group with
The Aluminum Assoc., Inc.
4
Current edition approved Dec. 1, 2023. Published December 2023. Originally Aluminum Association Technical Report T1, “Exfoliation Corrosion Testing of
ɛ1
approved in 1980. Last previous edition approved in 2018 as G66 – 99 (2018) . Aluminum Alloys 5086 and 5456”.
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DOI: 10.1520/G0066-23. Sprowls, D. O., Walsh, J. D. and Shumaker, M. B., “Simplified Exfoliation
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Testing of Aluminum Alloys”, Localized Corrosion—Cause of Metal Failure, ASTM
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM STP 516, ASTM, 1972, pp 38–65.
6
Standards volume information, refer to the standard’s Document Summary page on Summerson T. J., Interim Report, Aluminum Association Task Group on
the ASTM website. Exfoliation and Stress Corrosion Cracking of Aluminum Alloys for Boat Stock;
3
Available from ASTM International Headquarters. Order Adjunct No. Proceedings Tri-Service Corrosion Military Equipment Conference, October 29–31,
ADJG0066-E-PDF. Original adjunct produced in 1987. 1974; Technical Report AFML-TR-75-42, Vol. II, p. 193–221, February 1, 1975.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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G66 − 23
7. Reage
...
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.
´1
Designation: G66 − 99 (Reapproved 2018) G66 − 23
Standard Test Method for
Visual Assessment of Exfoliation Corrosion Susceptibility of
1
5XXX Series Aluminum Alloys (ASSET Test)
This standard is issued under the fixed designation G66; 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.
1
ε NOTE—Adjunct description in 2.2 and adjunct stock number in Footnote 4 were updated editorially in February 2023.
1. Scope
1.1 This test method covers a procedure for continuous immersion exfoliation corrosion testing of 5XXX series aluminum-
magnesium alloys containing 2.0 % or more magnesium.
1.2 This test method applies only to wrought products.
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, 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:
D1193 Specification for Reagent Water
G15G193 Terminology and Acronyms Relating to Corrosion and Corrosion Testing (Withdrawn 2010)
2.2 ASTM Adjunct:
3
ASSET Tested Specimens (2 figs, Fig. 1, 2; 8.5 × 11 in.) PDF Download
3. Terminology
3.1 Definitions:
3.1.1 exfoliation—exfoliation corrosion, n—subsurface corrosion that proceeds laterally from the sites of initiation along planes
parallel to the surface, generally at grain boundaries, surface forming corrosion products that force metal away from the body of
the material, giving rise to a layered appearance resembling the pages of a book. (see Terminology G15G193).
1
This test method is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
Corrosion Tests. This method was developed by a joint task group with The Aluminum Assoc., Inc.
Current edition approved Oct. 1, 2018Dec. 1, 2023. Published November 2018December 2023. Originally approved in 1980. Last previous edition approved in 20132018
ɛ1
as G66 – 99 (2013).(2018) . DOI: 10.1520/G0066-99R18E01.10.1520/G0066-23.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from ASTM International Headquarters. Order Adjunct No. ADJG0066-E-PDF. Original adjunct produced in 1987.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G66 − 23
4. Summary of Test Method
4.1 Specimens are immersed for 24 h at 65 6 1°C (150 6 2°F)24 h at 65 °C 6 1 °C (150 °F 6 2 °F) in a solution containing
ammonium chloride, ammonium nitrate, ammonium tartrate, and hydrogen peroxide. The susceptibility to exfoliation is
determined by visual examination using performance ratings established by reference to standard photographs.
5. Significance and Use
5.1 This test method provides a reliable prediction of the exfoliation corrosion behavior of Al-Mg alloys in marine
4,5,6
environments. The test is useful for alloy development studies and quality control of mill products such as sheet and plate.
6. Apparatus
6.1 Any suitable glass or plastic container can be used to contain the solution and specimens during the test period. Depending
upon the shape and size of the specimens, rods or racks of glass, plastic, or other inert substance shall be used to support the
specimens above the bottom of the container. The container should be fitted with a removable cover to reduce evaporation.
7. Reagents
7.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests.
7.2 Purity of Water—Distilled or deionized water conforming to Specification D119
...
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