ASTM_A_967_-_A_967M_-_17.pdf

Designation:A967/A967M17Standard 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 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 ofchemical passivation treatments for stainless steel parts.Itincludes recommendations and precautions for descaling,cleaning,and passivation of stainless steel parts.It includesseveral alternative tests,with acceptance criteria,for confirma-tion of effectiveness of such treatments for stainless steel parts.1.2 Practices for the mechanical and chemical treatments ofstainless steel surfaces are discussed more thoroughly inPractice A380/A380M.1.3 Several alternative chemical treatments are defined forpassivation of stainless steel parts.Appendix X1 and AppendixX2 give some nonmandatory information and provides somegeneral guidelines regarding the selection of passivation treat-ments appropriate to particular grades of stainless steel.Thisspecification makes no recommendations regarding the suit-ability of any grade,treatment,or acceptance criteria for anyparticular application or class of applications.1.4 The tests in this specification are intended to confirm theeffectiveness of passivation,particularly with regard to theremoval of free iron and other exogenous matter.These testsinclude the following practices: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 Ferricyanide-Nitric Acid Test,and1.4.6 Practice FDamp Cloth Test,and1.4.7 Practice GBoiling Water Immersion Test.NOTE1Free 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,irondeposits in welds,embedded iron,and iron oxide.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A380/A380M Practice for Cleaning,Descaling,and Passi-vation of Stainless Steel Parts,Equipment,and SystemsB117 Practice for Operating Salt Spray(Fog)ApparatusB254 Practice for Preparation of and Electroplating onStainless SteelB600 Guide for Descaling and Cleaning Titanium and Tita-nium Alloy SurfacesB912 Specification for Passivation of Stainless Steels UsingElectropolishing2.2 Federal Specification:3QQ-P-35C Passivation Treatments for Corrosion-ResistantSteels41This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.14 on Methods of Corrosion Testing.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1996.Last previous edition approved in 2013 as A967/A967M 13.DOI:10.1520/A0967-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20402.4In accordance with QQ-P-35C Notice 3,September 11,1998,SpecificationQQ-P-35C is cancelled and Specification A967/A967M should be used in its placefor DoD activities other than aerospace applications.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the