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ASTM G 44 Document Information:
Title
Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution
ASTM International
Publication Date:
Dec 10, 1999
Scope:
This practice covers procedures for making alternate immersion stress
corrosion tests in 3.5 %
sodium chloride (NaCl) (Note 1). It is primarily for tests of aluminum
alloys (Test Method G 47)
and ferrous alloys, but may be used for other metals exhibiting
susceptibility to chloride ions. It
sets forth the environmental conditions of the test and the means for
controlling them.
NOTE 1 - Alternate immersion stress corrosion exposures are sometimes
made in substitute ocean
water (without heavy metals) prepared in accordance with Specification
D 1141. The general
requirements of this present practice are also applicable to such
exposures except that the
reagents used, the solution concentration, and the solution pH should
be as specified in
Specification D 1141.
This practice can be used for both stressed and unstressed corrosion
specimens. Historically, it
has been used for stress-corrosion cracking testing, but is often used
for other forms of
corrosion, such as uniform, pitting, intergranular, and galvanic.
This practice is intended for alloy development and for applications
where the alternate immersion
test is to serve as a control test on the quality of successive lots
of the same material.
Therefore, strict test conditions are stipulated for maximum assurance
that variations in results
are attributable to variations in the material being tested.
The values stated in SI units are to be regarded as the standard. The
values given in parentheses
are for information only.
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.
Keywords:
- accelerated corrosion test
- alternate immersion test
- aluminum alloys
- ferrous alloys
- quality control test
- sodium chloride solution
- stress corrosion cracking
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