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ASTM G 28 Document Information:
Title
Standard Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys
ASTM International
Publication Date:
Oct 10, 2002
Scope:
These test methods cover two tests as follows:
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
G 15), 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.
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.
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.
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.
Keywords:
- corrosion test
- ferric sulfate
- intergranular
- nickel-rich
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