ASTM A967 A967M-2017 Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts《不锈钢零件化学钝化处理的标准规格》.pdf
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1、Designation: A967/A967M 13A967/A967M 17Standard Specification forChemical Passivation Treatments for Stainless Steel Parts1This standard is issued under the fixed designation A967/A967M; the number immediately following the designation indicates the yearof original adoption or, in the case of revisi
2、on, 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 specificat
3、ion covers several different types of chemical passivation treatments for stainless steel parts. It includesrecommendations and precautions for descaling, cleaning, and passivation of stainless steel parts. It includes several alternativetests, with acceptance criteria, for confirmation of effective
4、ness 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 PracticeA380A380/A380M.1.3 Several alternative chemical treatments are defined for passivation of stainless steel parts. Appendix X1
5、Appendix X1 andAppendix X2 givesgive some nonmandatory information and provides some general guidelines regarding the selection ofpassivation treatmenttreatments appropriate to particular grades of stainless steel. It This specification makes no recommendationsregarding the suitability of any grade,
6、 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 removalof free iron and other exogenous matter. These tests include the following p
7、ractices:1.4.1 Practice AWater Immersion Test,1.4.2 Practice BHigh Humidity Test,1.4.3 Practice CSalt Spray Test,1.4.4 Practice DCopper Sulfate Test,1.4.5 Practice EPotassium FerricyanideNitricFerricyanide-Nitric Acid Test, and1.4.6 Practice FDamp Cloth Test, and1.4.7 Practice FGDamp Cloth Boiling W
8、ater Immersion Test.NOTE 1Free iron denotes iron present on the surface of the parts, including but not limited to iron contamination, iron-tool marks, residual-iron saltsfrom pickling solutions, iron dust, atmospheric exposure, iron deposits in welds, embedded iron, and iron oxide.1.5 The values st
9、ated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1
10、.6 The following precautionary caveat pertains only to the test method portions, Section 14 of this specification:This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety
11、 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 standardizationestablished in the Decision on Principles for the Development of International Standar
12、ds, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A380A380/A380M Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and SystemsB117 Practice for Operating Sal
13、t Spray (Fog) Apparatus1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.14on Methods of Corrosion Testing.Current edition approved Feb. 15, 2013July 1, 2017. Published March 2013July 2
14、017. Originally approved in 1996. Last previous edition approved in 20052013 asA967 05A967/A967M 13.2. DOI: 10.1520/A0967-13.10.1520/A0967-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolu
15、me information, refer to the standards Document Summary page on the ASTM website.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. Becauseit may not be technically possible to adequ
16、ately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM I
17、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1B254 Practice for Preparation of and Electroplating on Stainless SteelB600 Guide for Descaling and Cleaning Titanium and Titanium Alloy SurfacesB912 Specification for Passivation of Stainless Steels Usi
18、ng Electropolishing2.2 Federal Specification:3QQ-P-35C Passivation Treatments for Corrosion-Resistant Steels43. Terminology3.1 Definition of Term Specific to This StandardIt is necessary to define which of the several commonly used definitions ofthe term passivation will be used in this specificatio
19、n. (See Discussion.)3.1.1 DiscussionStainless steels are autopassivating in the sense that the protective passive metal oxide film is formedspontaneously on exposure to air or moisture. The presence of exogenous surface contamination, including dirt, grease, free ironfrom contact with steel tooling,
20、 and so forth, may interfere with the formation of the passive metal oxide film. The cleaning of thesecontaminants from the stainless steel surface will facilitate the spontaneous passivation by allowing the oxygen uniform access tothe surface. The passive metal oxide film may be augmented by chemic
21、al treatments that provide an oxidizing environment forthe stainless steel surface.3.1.1.1 In this specification, passivation, unless otherwise specified, is defined as the chemical treatment of a stainless steel witha mild oxidant, such as a nitric acid solution, for the purpose of the removal of f
22、ree iron or other foreign matter, but which isgenerally not effective in removal of heat tint or oxide scale on stainless steel. In the case of stainless steels with additions of sulfurfor the purpose of improved machinability, passivation may also include the removal of sulfides from the surface of
23、 the metal forthe purpose of maximizing corrosion resistance.3.1.1.2 The formation of the protective passive metal oxide film on a stainless steel, also called passivation in a more generalcontext, will occur spontaneously in air or other oxygen-containing environment when the stainless steel surfac
24、e is free of oxidescale and exogenous matter.3.1.1.3 Chemical treatments, such as sodium dichromate solutions, may facilitate the more rapid formation of the passive filmon a stainless steel surface already free of scale or foreign matter. Such treatments, also sometimes called passivation in common
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