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ASTM G67-99

(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)

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.  
1.5 This standard does not purport to address all of the safety problems, 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
09-Aug-1999
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

Replaced By
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to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test) (Withdrawn 2013)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-2004
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
10-Aug-1999
Referred By
ASTM B928/B928M-15 - Standard Specification for High Magnesium Aluminum-Alloy Products for Marine Service and Similar Environments
Effective Date
10-Aug-1999
Referred By
ASTM G31-21 - Standard Guide for Laboratory Immersion Corrosion Testing of Metals
Effective Date
10-Aug-1999

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ASTM G67-99 - 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 G67-99 - 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 G67-99 - 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: G 67 – 99
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 G 67; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope continuous network along grain boundaries, the effect of the
preferential attack is to corrode around the grains, causing
1.1 This test method describes a procedure for constant
them to fall away from the specimens. Such dropping out of the
immersion intergranular corrosion testing of 5XXX series
grains causes relatively large mass losses of the order of 25 to
aluminum alloys.
2 2
75 mg/cm (160 to 480 mg/in ), whereas, samples of
1.2 This test method is applicable only to wrought products.
intergranular-resistant materials lose only about 1 to 15 mg/
1.3 This test method covers type of specimen, specimen
2 2
cm (10 to 100 mg/in ). When the bAl-Mg compound is
preparation, test environment, and method of exposure.
randomly distributed, the preferential attack can result in
1.4 The values stated in SI units are to be regarded as the
intermediate mass losses. Metallographic examination is re-
standard.
quired in such cases to establish whether or not the loss in mass
1.5 This standard does not purport to address all of the
is the result of intergranular attack.
safety concerns, if any, associated with its use. It is the
4.2 The precipitation of the second phase in the grain
responsibility of the user of this standard to establish appro-
boundaries also gives rise to intergranular corrosion when the
priate safety and health practices and determine the applica-
material is exposed to chloride-containing natural environ-
bility of regulatory limitations prior to use.
ments, such as seacoast atmospheres or sea water. The extent to
2. Referenced Documents which the alloy will be susceptible to intergranular corrosion
depends upon the degree of precipitate continuity in the grain
2.1 ASTM Standards:
2
boundaries. Visible manifestations of the attack may be in
D 1193 Specification for Reagent Water
various forms such as pitting, exfoliation, or stress-corrosion
G 1 Practice for Preparing, Cleaning, and Evaluating Cor-
3
cracking, depending upon the morphology of the grain struc-
rosion Test Specimens
4
ture and the presence of sustained tensile stress.
3. Summary of Test Method
5. Interferences
3.1 This test method consists of immersing test specimens
5.1 If all loose particles are not removed during cleaning
in concentrated nitric acid at 30°C (86°F) for 24 h and
after exposure, the mass loss will be low relative to the amount
determining the mass loss per unit area as a measure of
of corrosion that actually occurred.
susceptibility to intergranular corrosion.
6. Apparatus
4. Significance and Use
6.1 Nonmetallic Container—A suitable inert, nonmetallic
4.1 This test method provides a quantitative measure of the
container should be used to contain the nitric acid and
susceptibility to intergranular corrosion of Al-Mg and Al-
specimens during the period of the test. The use of individual
Mg-Mn alloys. The nitric acid dissolves a second phase, an
beakers for each specimen is recommended; however, the
aluminum-magnesium intermetallic compound (bAl-Mg), in
immersion of multiple specimens in the same container is
preference to the solid solution of magnesium in the aluminum
acceptable.
matrix. When this compound is precipitated in a relatively
6.1.1 The specimens should be situated in the container so
that none of the major surfaces is in total contact with the walls
1
This test method is under the jurisdiction of ASTM Committee G-1 on
of the container. Also, specimens should be isolated electrically
Corrosion of Metals and is the direct responsibility of Subcommittee G01.05 on
from one another. A recommended method of positioning the
Laboratory Corrosion Tests. This method was developed by a joint task group with
The Aluminum Association, Inc.
Current edition approved Aug. 10, 1999. Published October 1999. Originally
4
published as G 67 – 80. Last previous edition G 67 – 93. Craig, H. L. Jr., “Nitric Acid Weight Loss Test for the H116 and H117 Tempers
2
Annual Book of ASTM Standards, Vol 11.01. of 5086 and 5456 Aluminum Alloys,” Localized Corrosion—Cause of Metal
3
Annual Book of ASTM Standards, Vol 03.02. Failure, ASTM STP 516, ASTM, pp. 17–37, 1972.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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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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L — Longitudinal: parallel to direction of principal metal extension during manufacture of the product.
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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 covers the determination of indentation hardness of aluminum alloys using a Barcol Impressor.  
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