ASTM_B_696_-_00_2015.pdf

Designation:B69600(Reapproved 2015)Standard Specification forCoatings of Cadmium Mechanically Deposited1This standard is issued under the fixed designation B696;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript 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.Scope1.1 This specification covers the requirements for a coatingof cadmium mechanically deposited on metal products.Thecoating is provided in various thicknesses up to and including12 m.1.2 Mechanical deposition greatly reduces the risk of hy-drogen embrittlement and is suitable for coating bores andrecesses in many parts that cannot be conveniently electro-plated(see Appendix X3).1.3 Cadmium coatings are usually applied to provide engi-neering properties and corrosion resistance.The performanceof a cadmium coating depends largely on its thickness and thekind of environment to which it is exposed.Without proof ofsatisfactory correlation,accelerated tests such as the salt spray(fog)test cannot be relied upon to predict performance in otherenvironments,nor will these serve as comparative measures ofthe corrosion resistance afforded by coatings of differentmetals.Thus,although there is a marked superiority of cad-mium coatings over zinc coatings of equal thickness in the saltspray test,this is often not the case under conditions of use,sothat further testing in the service environment should beconducted.1.4 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.For specificprecautionary statements,see 1.5 and 1.6.1.5 WarningCadmium is toxic and must not be used in acoating for articles that can come into contact with food orbeverages,or for dental or other equipment that can be insertedinto the mouth.Consult appropriate agencies for regulations inthis connection.1.6 WarningBecause of the toxicity of cadmium vaporsand cadmium oxide fumes,cadmium-coated articles must notbe used at temperatures of 320C and above.They must not bewelded,spot-welded,soldered,or otherwise strongly heatedwithout adequate ventilation that will efficiently remove alltoxic fumes.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusB183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Preparation of High-Carbon Steel for Elec-troplatingB322 Guide for Cleaning Metals Prior to ElectroplatingB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB499 Test Method for Measurement of Coating Thicknessesby the Magnetic Method:Nonmagnetic Coatings onMagnetic Basis MetalsB567 Test Method for Measurement of Coating Thicknessby the Beta Backscatter MethodB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB697 Guide for Selection of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection3.Classification3.1 ClassesCadmium coatings are classified on the basisof thickness,as follows:ClassMinimum Thickness,m121288551This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.06 on Soft Metals.Current edition approved March 1,2015.Published April 2015.Originallyapproved in 1981.Last previous edition approved in 2009 as B696 00(2009).DOI:10.1520/B0696-00R15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 TypesCadmium coatings are identified by types on thebasis of supplementary treatment required,as follows:Type IAs coated without supplementary chromate treat-ment(Appendix X2.1).Type IIWith colored chromate conversion treatment(Ap-pendix X2.2).4.Ordering Information4.1 To make the application of this standard complete,thepurchaser should supply the following information to the sellerin the purchase order or other governing document:4.1.1 Class,including a maximum thickness,if appropriate,Type,and for Type II,color and need for supplementallubricant(see 3.1,3.2,and 6.2.4.2),4.1.2 Nature of substrate(for example,high-strength steel),needed for stress relief(6.2.1),and cleaning precau