ASTM A967/A967M-17
(Specification)Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
ABSTRACT
This specification covers several different types of chemical passivation treatments for stainless steel parts. The treatments are the following: immersion treatment using nitric acid solutions, immersion treatment using citric acid solution, and electrochemical treatment. Immediately after the removal from the passivating solution, the parts shall be thoroughly rinsed, using stagnant, countercurrent, or spray washes, singly or in combination, with or without a separate chemical treatment for neutralization of the passivation media. The chemical reactions of the passivating media on the surface of the stainless steel shall be stopped by rinsing of the stainless steel part, with or without a separate neutralization treatment. A chemical treatment shall be applied which will accelerate the formation of the passive film on a chemically clean stainless steel surface. The passivated parts shall exhibit a chemically clean surface and shall, on visual inspection, show no etching, pitting, or frosting. The following tests shall be performed on each lot of stainless steel parts: water immersion test, high humidity test, salt spray test, copper sulfate test, and potassium ferricyanide-nitric acid test. A free iron test shall be used for the detection of free iron on the surface of stainless steel.
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/A380M.
1.3 Several alternative chemical treatments are defined for passivation of stainless steel parts. Appendix X1 and Appendix X2 give some nonmandatory information and provides some general guidelines regarding the selection of passivation treatments appropriate to particular grades of stainless steel. This specification 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, and
1.4.7 Practice G—Boiling Water Immersion 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 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.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issu...
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A967/A967M −17
Standard Specification for
1
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* 1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
1.1 This specification covers several different types of
each system may not be exact equivalents; therefore, each
chemical passivation treatments for stainless steel parts. It
system shall be used independently of the other. Combining
includes recommendations and precautions for descaling,
values from the two systems may result in non-conformance
cleaning, and passivation of stainless steel parts. It includes
with the standard.
several alternative tests, with acceptance criteria, for confirma-
tion of effectiveness of such treatments for stainless steel parts. 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.2 Practices for the mechanical and chemical treatments of
responsibility of the user of this standard to establish appro-
stainless steel surfaces are discussed more thoroughly in
priate safety and health practices and determine the applica-
Practice A380/A380M.
bility of regulatory limitations prior to use.
1.3 Several alternative chemical treatments are defined for
1.7 This international standard was developed in accor-
passivation of stainless steel parts. Appendix X1 and Appendix
dance with internationally recognized principles on standard-
X2 give some nonmandatory information and provides some
ization established in the Decision on Principles for the
general guidelines regarding the selection of passivation treat-
Development of International Standards, Guides and Recom-
ments appropriate to particular grades of stainless steel. This
mendations issued by the World Trade Organization Technical
specification makes no recommendations regarding the suit-
Barriers to Trade (TBT) Committee.
ability of any grade, treatment, or acceptance criteria for any
particular application or class of applications.
2. Referenced Documents
1.4 Thetestsinthisspecificationareintendedtoconfirmthe
2
2.1 ASTM Standards:
effectiveness of passivation, particularly with regard to the
A380/A380M Practice for Cleaning, Descaling, and Passi-
removal of free iron and other exogenous matter. These tests
vation of Stainless Steel Parts, Equipment, and Systems
include the following practices:
B117 Practice for Operating Salt Spray (Fog) Apparatus
1.4.1 Practice A—Water Immersion Test,
B254 Practice for Preparation of and Electroplating on
1.4.2 Practice B—High Humidity Test,
Stainless Steel
1.4.3 Practice C—Salt Spray Test,
B600 Guide for Descaling and Cleaning Titanium and Tita-
1.4.4 Practice D—Copper Sulfate Test,
nium Alloy Surfaces
1.4.5 Practice E—Potassium Ferricyanide-Nitric Acid Test,
B912 Specification for Passivation of Stainless Steels Using
and
Electropolishing
1.4.6 Practice F—Damp Cloth Test, and
3
2.2 Federal Specification:
1.4.7 Practice G—Boiling Water Immersion Test.
QQ-P-35C Passivation Treatments for Corrosion-Resistant
4
NOTE 1—Free iron denotes iron present on the surface of the parts,
Steels
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.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, the ASTM website.
3
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Available from Superintendent of Documents, U.S. Government Printing
A01.14 on Methods of Corrosion Testing. Office, Washington, DC 20402.
4
Current edition approved July 1, 2017. Published July 2017. Originally approved In accordance with QQ-P-35C Notice 3, September 11, 1998, Specification
in 1996. Last previous edition approved in 2013 as A967/A967M – 13. DOI: QQ-P-35C is cancelled and Specification A967/A967M should be used in its place
10.1520/A0967-17. for D
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A967/A967M − 13 A967/A967M − 17
Standard Specification for
1
Chemical Passivation Treatments for Stainless Steel Parts
This standard is issued under the fixed designation A967/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*
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
A380A380/A380M.
1.3 Several alternative chemical treatments are defined for passivation of stainless steel parts. Appendix X1Appendix X1 and
Appendix X2 givesgive some nonmandatory information and provides some general guidelines regarding the selection of
passivation treatmenttreatments appropriate to particular grades of stainless steel. It This specification 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–NitricFerricyanide-Nitric Acid Test, and
1.4.6 Practice F—Damp Cloth Test, and
1.4.7 Practice F—G—Damp Cloth Boiling Water Immersion 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.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A380A380/A380M Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
B117 Practice for Operating Salt Spray (Fog) Apparatus
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.14
on Methods of Corrosion Testing.
Current edition approved Feb. 15, 2013July 1, 2017. Published March 2013July 2017. Originally approved in 1996. Last previous edition approved in 20052013 as
ε2
A967 – 05A967/A967M – 13. . DOI: 10.1520/A0967-13.10.1520/A0967-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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