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ASTM G 37 Document Information:
Title
Standard Practice for Use of Mattsson's Solution of pH 7.2 to Evaluate the Stress-Corrosion Cracking Susceptibility of Copper-Zinc Alloys
ASTM International
Publication Date:
Apr 10, 1998
Scope:
This practice covers the preparation and use of Mattsson's solution of
pH 7.2 as an accelerated
stress-corrosion cracking test environment for brasses (copper-zinc
base alloys). The variables (to
the extent that these are known at present) that require control are
described together with
possible means for controlling and standardizing these variables.
This practice is recommended only for brasses (copper-zinc base
alloys). The use of this test
environment is not recommended for other copper alloys since the
results may be erroneous,
providing completely misleading rankings. This is particularly true of
alloys containing aluminum
or nickel as deliberate alloying additions.
This practice is intended primarily where the test objective is to
determine the relative
stress-corrosion cracking susceptibility of different brasses under
the same or different stress
conditions or to determine the absolute degree of stress corrosion
cracking susceptibility, if any,
of a particular brass or brass component under one or more specific
stress conditions. Other
legitimate test objectives for which this test solution may be used
do, of course, exist. The
tensile stresses present may be known or unknown, applied or residual.
The practice may be applied
to wrought brass products or components, brass castings, brass
weldments, and so forth, and to all
brasses. Strict environmental test conditions are stipulated for
maximum assurance that apparent
variations in stress-corrosion susceptibility are attributable to real
variations in the material
being tested or in the tensile stress level and not to environmental
variations.
This practice relates solely to the preparation and control of the
test environment. No attempt is
made to recommend surface preparation or finish, or both, as this may
vary with the test
objectives. Similarly, no attempt is made to recommend particular
stress-corrosion test specimen
configurations or methods of applying the stress. Test specimen
configurations that may be used are
referenced in Practice G 30 and STP 425.(Footnote 2)
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. (For more
specific safety hazard statements see Section 8.)
Footnote 2 - Stress Corrosion Testing, ASTM STP 425, ASTM (Although
currently out of print, copies
may be obtained from University Microfilms, Inc., 300 North Zeeb Rd.,
Ann Arbor, MI 48106).
Keywords:
- accelerated stress-corrosion cracking test environment
- continuous immersion
- copper-ammonium sulfate solution
- copper-zinc alloys
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