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ASTM G67-13

(Test Method)

Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)

Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)

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 to 75 mg/cm2  (160 to 480 mg/in2), whereas, samples of intergranular-resistant materials lose only about 1 to 15 mg/cm2 (10 to 100 mg/in2). 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
SCOPE
1.1 This test method describes 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2013
ICS
77.120.10 - Aluminium and aluminium alloys
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.05 - Laboratory Corrosion Tests
Current Stage
Ref Project

Relations

Replaces
ASTM G67-04 - Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test) (Withdrawn 2013)
Effective Date
01-May-2013
Replaced By
ASTM G67-18 - Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)
Effective Date
01-Oct-2018
Referred By
ASTM G110-92(2022)e2 - Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
Effective Date
01-May-2013
Referred By
ASTM G31-21 - Standard Guide for Laboratory Immersion Corrosion Testing of Metals
Effective Date
01-May-2013
Referred By
ASTM B928/B928M-15 - Standard Specification for High Magnesium Aluminum-Alloy Products for Marine Service and Similar Environments
Effective Date
01-May-2013

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ASTM G67-13 - Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)ASTM G67-13 - Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)
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ASTM G67-13 - Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)
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Standards Content (Sample)

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: G67 − 13
Standard Test Method for
Determining the Susceptibility to Intergranular Corrosion of
5XXX Series Aluminum Alloys by Mass Loss After Exposure
1
to Nitric Acid (NAMLT Test)
This standard is issued under the fixed designation G67; 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.
1. Scope 4. Significance and Use
4.1 This test method provides a quantitative measure of the
1.1 This test method describes a procedure for constant
susceptibility to intergranular corrosion of Al-Mg and Al-
immersion intergranular corrosion testing of 5XXX series
Mg-Mn alloys. The nitric acid dissolves a second phase, an
aluminum alloys.
aluminum-magnesium intermetallic compound (βAl-Mg), in
1.2 This test method is applicable only to wrought products.
preference to the solid solution of magnesium in the aluminum
matrix. When this compound is precipitated in a relatively
1.3 This test method covers type of specimen, specimen
continuous network along grain boundaries, the effect of the
preparation, test environment, and method of exposure.
preferential attack is to corrode around the grains, causing
1.4 The values stated in SI units are to be regarded as the
themtofallawayfromthespecimens.Suchdroppingoutofthe
standard. The values given in parentheses are for information
grains causes relatively large mass losses of the order of 25 to
only.
2 2
75 mg/cm (160 to 480 mg/in ), whereas, samples of
1.5 This standard does not purport to address all of the
intergranular-resistant materials lose only about 1 to 15 mg/
2 2
safety concerns, if any, associated with its use. It is the
cm (10 to 100 mg/in ). When the βAl-Mg compound is
responsibility of the user of this standard to establish appro-
randomly distributed, the preferential attack can result in
priate safety and health practices and determine the applica-
intermediate mass losses. Metallographic examination is re-
bility of regulatory limitations prior to use.
quiredinsuchcasestoestablishwhetherornotthelossinmass
is the result of intergranular attack.
2. Referenced Documents
4.2 The precipitation of the second phase in the grain
2
boundaries also gives rise to intergranular corrosion when the
2.1 ASTM Standards:
material is exposed to chloride-containing natural
D1193 Specification for Reagent Water
environments, such as seacoast atmospheres or sea water. The
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
extent to which the alloy will be susceptible to intergranular
sion Test Specimens
corrosion depends upon the degree of precipitate continuity in
the grain boundaries. Visible manifestations of the attack may
3. Summary of Test Method
be in various forms such as pitting, exfoliation, or stress-
3.1 This test method consists of immersing test specimens
corrosion cracking, depending upon the morphology of the
in concentrated nitric acid at 30°C (86°F) for 24 h and 3
grain structure and the presence of sustained tensile stress.
determining the mass loss per unit area as a measure of
susceptibility to intergranular corrosion. 5. Interferences
5.1 If all loose particles are not removed during cleaning
after exposure, the mass loss will be low relative to the amount
1
This test method is under the jurisdiction of ASTM Committee G01 on of corrosion that actually occurred.
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
6. Apparatus
The Aluminum Association, Inc.
6.1 Nonmetallic Container—A suitable inert, nonmetallic
Current edition approved May 1, 2013. Published May 2013. Originally
approved in 1980. Last previous edition approved in 2004 as G67 – 04, which was
container should be used to contain the nitric acid and
withdrawn January 2013 and reinstated May 2013. DOI: 10.1520/G0067-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Craig, H. L. Jr., “NitricAcid Weight Loss Test for the H116 and H117 Tempers
Standards volume information, refer to the standard’s Document Summary page on of 5086 and 5456 Aluminum Alloys,” Localized Corrosion—Cause of Metal
the ASTM website. Failure, ASTM STP 516, ASTM, 1972, pp. 17–37.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G67−13
specimens during the period of the test. The use of individual 11.4 Immerse the specimens in 5 % NaOH solution at 80°C
beakers for each specimen is re
...

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4.1 Although there are ASTM test methods for exfoliation testing, they concentrate on specific procedures for test methodology itself. Existent test methods do not discuss material variables that can affect performance. Likewise they do not address the need to establish the suitability of an accelerated test for alloys never previously tested nor the need to correlate results of accelerated tests with tests in outdoor atmospheres and with end-use performance.  
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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).  
1.2 This guide covers aspects of specimen preparation, exposure, inspection, and evaluation for conducting exfoliation tests on aluminum alloys in both laboratory accelerated environments and in natural, outdoor atmospheres. The intent is to clarify any gaps in existent test methods.  
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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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1.1 This practice covers the procedures for immersion tests in sodium chloride + hydrogen peroxide solution. It is primarily for tests of wrought heat treatable aluminum alloys (2XXX and 7XXX) but may be used for other aluminum alloys, including castings. It sets forth the specimen preparation procedures and the environmental conditions of the test and the means for controlling them.  
1.2 This practice is intended for evaluations during alloy development and for evaluating production where it may serve as a control test on the quality of successive lots of the same material (see MIL-H-6088 and U.S. Federal Test Method Std. 151b). Therefore strict test conditions are stipulated for maximum assurance that variations in results are attributable to lot-to-lot differences in the material being tested.
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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.  
4.2 Interpretations of the SCC ratings in terms of typical problem areas including service experience are given in Table 1. Practical experience has shown that SCC problems with aluminum alloys generally have involved situations where the direction and magnitude of the tensile stresses resulting from manufacturing or use, or both, of the material were not recognized. (A) The sum of all stresses including those from service loads (applied), heat treatment, straightening, forming, and so forth.  
4.3 A list of the SCC ratings for the heat-treatable aluminum alloy products is given in Table 2. Revisions to the table will be required as new materials become available and additional test results are accumulated. (A) The ratings apply to standard mill products in the types of tempers indicated, including stress-relieved tempers, and could be invalidated in some cases by application of nonstandard thermal treatments or mechanical deformation at room temperature by the user.(B) Test direction refers to orientation of the stressing direction relative to the directional grain structure typical of wrought materials, which in the case of extrusions and forgings may not be predictable from the geometrical cross section of the product.
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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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 to 75 mg/cm2  (160 to 480 mg/in.2), whereas, samples of intergranular-resistant materials lose only about 1 to 15 mg/cm2 (10 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.  
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1.1 This test method, also known as the Nitric Acid Mass Loss Test (NAMLT) describes a procedure for constant immersion intergranular corrosion testing of 5XXX series aluminum alloys.  
1.2 This test method is applicable only to wrought products.  
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1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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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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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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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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