ASTM A967/A967M-13
(Specification)Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
SCOPE
1.1 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.
1.2 Practices for the mechanical and chemical treatments of stainless steel surfaces are discussed more thoroughly in Practice A380.
1.3 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.
1.4 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:
1.4.1 Practice A—Water Immersion Test,
1.4.2 Practice B—High Humidity Test,
1.4.3 Practice C—Salt Spray Test,
1.4.4 Practice D—Copper Sulfate Test,
1.4.5 Practice E—Potassium Ferricyanide–Nitric Acid Test, and
1.4.6 Practice F—Damp Cloth Test.Note 1—Free iron denotes iron present on the surface of the parts, including but not limited to iron contamination, iron-tool marks, residual-iron salts from pickling solutions, iron dust, atmospheric exposure, iron deposits in welds, embedded iron and iron oxide.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.6 The following precautionary caveat pertains only to the test method portions, Section 14 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.
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Designation:A967/A967M −13
Standard Specification for
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Chemical Passivation Treatments for Stainless Steel Parts
This standard is issued under the fixed designationA967/A967M; 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* each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
1.1 This specification covers several different types of
values from the two systems may result in non-conformance
chemical passivation treatments for stainless steel parts. It
with the standard.
includes recommendations and precautions for descaling,
1.6 The following precautionary caveat pertains only to the
cleaning, and passivation of stainless steel parts. It includes
test method portions, Section 14 of this specification:This
several alternative tests, with acceptance criteria, for confirma-
standard does not purport to address all of the safety concerns,
tion of effectiveness of such treatments for stainless steel parts.
if any, associated with its use. It is the responsibility of the user
1.2 Practices for the mechanical and chemical treatments of
of this standard to establish appropriate safety and health
stainless steel surfaces are discussed more thoroughly in
practices and determine the applicability of regulatory limita-
Practice A380.
tions prior to use.
1.3 Several alternative chemical treatments are defined for
passivation of stainless steel parts. Appendix X1 gives some 2. Referenced Documents
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nonmandatory information and provides some general guide-
2.1 ASTM Standards:
lines regarding the selection of passivation treatment appropri-
A380 Practice for Cleaning, Descaling, and Passivation of
ate to particular grades of stainless steel. It makes no recom-
Stainless Steel Parts, Equipment, and Systems
mendations regarding the suitability of any grade, treatment, or
B117 Practice for Operating Salt Spray (Fog) Apparatus
acceptance criteria for any particular application or class of
B254 Practice for Preparation of and Electroplating on
applications.
Stainless Steel
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1.4 Thetestsinthisspecificationareintendedtoconfirmthe 2.2 Federal Specification:
effectiveness of passivation, particularly with regard to the QQ-P-35C Passivation Treatments for Corrosion-Resistant
removal of free iron and other exogenous matter. These tests
Steels
include the following practices:
3. Terminology
1.4.1 Practice A—Water Immersion Test,
1.4.2 Practice B—High Humidity Test,
3.1 Definition of Term Specific to This Standard—It is
1.4.3 Practice C—Salt Spray Test,
necessary to define which of the several commonly used
1.4.4 Practice D—Copper Sulfate Test,
definitions of the term passivation will be used in this
1.4.5 Practice E—Potassium Ferricyanide–NitricAcid Test,
specification. (See Discussion.)
and
3.1.1 Discussion—Stainlesssteelsareautopassivatinginthe
1.4.6 Practice F—Damp Cloth Test.
sense that the protective passive film is formed spontaneously
on exposure to air or moisture. The presence of exogenous
NOTE 1—Free iron denotes iron present on the surface of the parts,
surface contamination, including dirt, grease, free iron from
including but not limited to iron contamination, iron-tool marks, residual-
iron salts from pickling solutions, iron dust, atmospheric exposure, iron contact with steel tooling, and so forth, may interfere with the
deposits in welds, embedded iron and iron oxide.
formation of the passive film. The cleaning of these contami-
nants from the stainless steel surface will facilitate the spon-
1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in taneous passivation by allowing the oxygen uniform access to
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This specification is under the jurisdiction of ASTM Committee A01 on Steel, For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
A01.14 on Methods of Corrosion Testing. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Feb. 15, 2013. Published March 2013. Originally the ASTM website.
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approved in 1996. Last previous edition approved in 2005 as A967 – 05 . DOI: Available from Superintendent of Documents, U.S. Government Printing
10.1520/A0967-13. Office, Washington, DC 20402.
*A Summary of Changes section appears at the end of this standard
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