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ASTM A 967 Document Information:
Title
Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
ASTM International
Publication Date:
Sep 1, 2005
Scope:
This specification covers several different types of chemical
passivation treatments for stainless steel parts. It includes
recommendations and precautions for descaling, cleaning, and
passivation of stainless steel parts. It includes several
alternative tests, with acceptance criteria, for confirmation of
effectiveness of such treatments for stainless steel parts.
Practices for the mechanical and chemical treatments of
stainless steel surfaces are discussed more thoroughly in Practice
A 380.
Several alternative chemical treatments are defined for
passivation of stainless steel parts. Appendix X1 gives some
nonmandatory information and provides some general guidelines
regarding the selection of passivation treatment appropriate to
particular grades of stainless steel. It makes no recommendations
regarding the suitability of any grade, treatment, or acceptance
criteria for any particular application or class of
applications.
The tests in this specification are intended to confirm the
effectiveness of passivation, particularly with regard to the
removal of free iron and other exogenous matter. These tests
include the following practices:
Practice A—Water Immersion Test,
Practice B—High Humidity Test,
Practice C—Salt Spray Test,
Practice D—Copper Sulfate Test,
Practice E—Potassium Ferricyanide–Nitric Acid Test,
and
Practice F—Free Iron Test.
The values stated in inch-pound units are to be regarded as the
standard. The SI units given in parentheses are for information
only.
The following precautionary caveat pertains only to the test
method portions, Sections 14 through 18 of this specification:
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.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- cleaning of stainless steel
- descaling
- passivation
- tests for cleanliness of stainless steels
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