ASTM G28-02(2015)

Standard Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys

SIGNIFICANCE AND USE
3.1 The boiling ferric sulfate-sulfuric acid test may be applied to the following alloys in the wrought condition:    
Alloy  
Testing Time, h  
N06007  
120  
N06022  
24  
N06030  
120  
N06059  
24  
N06200  
24  
N06455  
24  
N06600  
24  
N06625  
120  
N06686  
24  
N06985  
120  
N08020  
120  
N08367  
24  
N08800  
120  
N08825A  
120  
N10276  
24(A) While the ferric sulfate-sulfuric acid test does detect susceptibility to inter- granular corrosion in Alloy N08825, the boiling 65 % nitric acid test, Practices A262, Practice C, for detecting susceptibility to intergranular corrosion in stainless steels is more sensitive and should be used if the intended service is nitric acid.  
3.2 This test method may be used to evaluate as-received material and to evaluate the effects of subsequent heat treatments. In the case of nickel-rich, chromium-bearing alloys, the test method may be applied to wrought and weldments of products. The test method is not applicable to cast products.
SCOPE
1.1 These test methods cover two tests as follows:  
1.1.1 Method A, Ferric Sulfate-Sulfuric Acid Test (Sections 3 – 10, inclusive)—This test method describes the procedure for conducting the boiling ferric sulfate—50 % sulfuric acid test which measures the susceptibility of certain nickel-rich, chromium-bearing alloys to intergranular corrosion (see Terminology G15), which may be encountered in certain service environments. The uniform corrosion rate obtained by this test method, which is a function of minor variations in alloy composition, may easily mask the intergranular corrosion components of the overall corrosion rate on alloys N10276, N06022, N06059, and N06455.  
1.1.2 Method B, Mixed Acid-Oxidizing Salt Test (Sections 11 – 18, inclusive)—This test method describes the procedure for conducting a boiling 23 % sulfuric + 1.2 % hydrochloric + 1 % ferric chloride + 1 % cupric chloride test which measures the susceptibility of certain nickel-rich, chromium-bearing alloys to display a step function increase in corrosion rate when there are high levels of grain boundary precipitation.  
1.2 The purpose of these two test methods is to detect susceptibility to intergranular corrosion as influenced by variations in processing or composition, or both. Materials shown to be susceptible may or may not be intergranularly corroded in other environments. This must be established independently by specific tests or by service experience.  
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 and health practices and determine the applicability of regulatory limitations prior to use. Warning statements are given in 5.1.1, 5.1.3, 5.1.9, 13.1.1, and 13.1.11.

General Information

• Status: Historical
• Publication Date: 31-Oct-2015
• ICS: 77.120.40 - Nickel, chromium and their alloys
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.05 - Laboratory Corrosion Tests

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: G28 − 02 (Reapproved 2015)
Standard Test Methods for
Detecting Susceptibility to Intergranular Corrosion in
1
Wrought, Nickel-Rich, Chromium-Bearing Alloys
ThisstandardisissuedunderthefixeddesignationG28;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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 These test methods cover two tests as follows:
A262 Practices for Detecting Susceptibility to Intergranular
1.1.1 Method A, Ferric Sulfate-Sulfuric Acid Test (Sections
Attack in Austenitic Stainless Steels
3–10, inclusive)—This test method describes the procedure
D1193 Specification for Reagent Water
for conducting the boiling ferric sulfate—50 % sulfuric acid
G15 Terminology Relating to Corrosion and Corrosion Test-
test which measures the susceptibility of certain nickel-rich,
3
ing (Withdrawn 2010)
chromium-bearing alloys to intergranular corrosion (see Ter-
minology G15), which may be encountered in certain service
METHOD A—Ferric Sulfate—Sulfuric Acid Test
environments. The uniform corrosion rate obtained by this test
3. Significance and Use
method, which is a function of minor variations in alloy
composition, may easily mask the intergranular corrosion
3.1 The boiling ferric sulfate-sulfuric acid test may be
components of the overall corrosion rate on alloys N10276,
applied to the following alloys in the wrought condition:
N06022, N06059, and N06455.
Alloy Testing Time, h
1.1.2 Method B, Mixed Acid-Oxidizing Salt Test (Sections
N06007 120
11–18, inclusive)—This test method describes the procedure
N06022 24
for conducting a boiling 23 % sulfuric + 1.2 % hydrochlo-
N06030 120
N06059 24
ric+1% ferric chloride+1% cupric chloride test which
N06200 24
measures the susceptibility of certain nickel-rich, chromium-
N06455 24
bearing alloys to display a step function increase in corrosion N06600 24
N06625 120
rate when there are high levels of grain boundary precipitation.
N06686 24
N06985 120
1.2 The purpose of these two test methods is to detect
N08020 120
susceptibility to intergranular corrosion as influenced by varia-
N08367 24
N08800 120
tionsinprocessingorcomposition,orboth.Materialsshownto
A
N08825 120
be susceptible may or may not be intergranularly corroded in
N10276 24
other environments.This must be established independently by
A
specific tests or by service experience.
While the ferric sulfate-sulfuric acid test does detect susceptibility to inter-
granular corrosion in Alloy N08825, the boiling 65 % nitric acid test, Practices
1.3 This standard does not purport to address all of the
A262,PracticeC,fordetectingsusceptibilitytointergranularcorrosioninstainless
steels is more sensitive and should be used if the intended service is nitric acid.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.2 This test method may be used to evaluate as-received
priate safety and health practices and determine the applica-
material and to evaluate the effects of subsequent heat treat-
bilityofregulatorylimitationspriortouse.Warningstatements
ments. In the case of nickel-rich, chromium-bearing alloys, the
are given in 5.1.1, 5.1.3, 5.1.9, 13.1.1, and 13.1.11.
test method may be applied to wrought and weldments of
products. The test method is not applicable to cast products.
1 2
These test methods are under the jurisdiction of ASTM Committee G01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Corrosion of Metals and are the direct responsibility of Subcommittee G01.05 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Laboratory Corrosion Tests. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2015. Published November 2015. Originally the ASTM website.
3
approved in 1971. Last previous edition approved in 2008 as G28–02 (2008). DOI: The last approved version of this historical standard is referenced on
10.1520/G0028-02R15. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G28 − 02 (2015)
4. Apparatus 5.1.6 Lubricate the ground glass of the condenser joint with
silicone grease.
4.1 The apparatus (Note 1) is illustrated in Fig. 1.
4 5.1.7 Cover the flask with the condenser and circulate
4.1.1 Allihn or Soxhlet Condenser, 4-bulb, with a 45/50
cooling water.
ground-glass joint, overall length about 330
...

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.
Designation: G28 − 02 (Reapproved 2008) G28 − 02 (Reapproved 2015)
Standard Test Methods for
Detecting Susceptibility to Intergranular Corrosion in
1
Wrought, Nickel-Rich, Chromium-Bearing Alloys
This standard is issued under the fixed designation G28; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 These test methods cover two tests as follows:
1.1.1 Method A, Ferric Sulfate-Sulfuric Acid Test (Sections 3 – 10, inclusive)—This test method describes the procedure for
conducting the boiling ferric sulfate—50 % sulfuric acid test which measures the susceptibility of certain nickel-rich,
chromium-bearing alloys to intergranular corrosion (see Terminology G15), which may be encountered in certain service
environments. The uniform corrosion rate obtained by this test method, which is a function of minor variations in alloy
composition, may easily mask the intergranular corrosion components of the overall corrosion rate on alloys N10276, N06022,
N06059, and N06455.
1.1.2 Method B, Mixed Acid-Oxidizing Salt Test (Sections 11 – 18, inclusive)—This test method describes the procedure for
conducting a boiling 23 % sulfuric + 1.2 % hydrochloric + 1 % ferric chloride + 1 % cupric chloride test which measures the
susceptibility of certain nickel-rich, chromium-bearing alloys to display a step function increase in corrosion rate when there are
high levels of grain boundary precipitation.
1.2 The purpose of these two test methods is to detect susceptibility to intergranular corrosion as influenced by variations in
processing or composition, or both. Materials shown to be susceptible may or may not be intergranularly corroded in other
environments. This must be established independently by specific tests or by service experience.
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 and health practices and determine the applicability of regulatory
limitations prior to use. Warning statements are given in 5.1.1, 5.1.3, 5.1.9, 13.1.1, and 13.1.11.
2. Referenced Documents
2
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
D1193 Specification for Reagent Water
3
G15 Terminology Relating to Corrosion and Corrosion Testing (Withdrawn 2010)
METHOD A—Ferric Sulfate—Sulfuric Acid Test
3. Significance and Use
3.1 The boiling ferric sulfate-sulfuric acid test may be applied to the following alloys in the wrought condition:
Alloy Testing Time, h
N06007 120
N06022 24
N06030 120
N06059 24
1
These test methods are under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and are the direct responsibility of Subcommittee G01.05 on Laboratory
Corrosion Tests.
Current edition approved May 1, 2008Nov. 1, 2015. Published May 2008November 2015. Originally approved in 1971. Last previous edition approved in 20022008 as
G28–02. –02 (2008). DOI: 10.1520/G0028-02R08.10.1520/G0028-02R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G28 − 02 (2015)
N06200 24
N06455 24
N06600 24
N06625 120
N06686 24
N06985 120
N08020 120
N08367 24
N08800 120
A
N08825 120
N10276 24
A
While the ferric sulfate-sulfuric acid test does detect susceptibility to inter- granular corrosion in Alloy N08825, the boiling 65 % nitric acid test, Practices A262, Practice
C, for detecting susceptibility to intergranular corrosion in stainless steels is more sensitive and should be used if the intended service is nitric acid.
3.2 This test method may be used to evaluate as-received material and to evaluate the effects of subsequent heat treatments. In
the case of nickel-rich, chromium-bearing alloys, the test method may be applied to wr
...