ASTM_B_545_-_13.pdf

Designation:B54513Standard Specification forElectrodeposited Coatings of Tin1This standard is issued under the fixed designation B545;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 Department of Defense.1.Scope1.1 This specification covers the requirements for electrode-posited(electroplated)coatings of tin applied to metallicarticles.Tin coatings are used to provide a low contact-resistance surface,to protect against corrosion(see 1.2),tofacilitate soldering,to provide anti-galling properties,and to bea stopoff coating in the nitriding of high-strength steels.1.2 Some corrosion can be expected from tin coatingsexposed outdoors.In normal indoor exposure,tin is protectiveon iron,steel,nickel,copper,and their alloys.Corrosion can beexpected at discontinuities in the coating(such as pores)due togalvanic couples formed between the tin and the underlyingmetal through the discontinuities,especially in humid atmo-spheres.Porosity increases as the coating thickness decreases,so that minimum thicknesses must be specified for eachapplication.Parts coated with tin can be assembled safely incontact with iron and steel,tin-coated aluminum,yellowchromated zinc,cadmium,and solder coatings.(See X5.1 foroxidation and corrosion properties.)1.3 This specification applies to electroplated coatings ofnot less than 99%tin(except where deliberately alloyed forspecial purposes,as stated in X6.3)obtained from any of theavailable tin electroplating processes(see 4.3).1.4 This specification does not apply to hot-dipped tin orother non-electrodeposited coating;it also does not apply tomill products.For mill products,refer to Specifications A623or A623M.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.2.Referenced Documents2.1 ASTM Standards:2A623 Specification for Tin Mill Products,General Require-mentsA623M Specification for Tin Mill Products,General Re-quirements MetricB32 Specification for Solder MetalB183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Preparation of High-Carbon Steel for Elec-troplatingB246 Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical PurposesB281 Practice for Preparation of Copper and Copper-BaseAlloys for Electroplating and Conversion CoatingsB320 Practice for Preparation of Iron Castings for Electro-platingB322 Guide for Cleaning Metals Prior to ElectroplatingB374 Terminology Relating 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 MetalsB504 Test Method for Measurement of Thickness of Metal-lic Coatings by the Coulometric MethodB507 Practice for Design of Articles to Be Electroplated onRacksB542 Terminology Relating to Electrical Contacts and TheirUseB558 Practice for Preparation of Nickel Alloys for Electro-platingB567 Test Method for Measurement of Coating Thicknessby the Beta Backscatter MethodB568 Test Method for Measurement of Coating Thicknessby X-Ray Spectrometry1This 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 May 1,2013.Published July 2013.Originally approvedin 1971.Last previous edition approved in 2009 as B545 97(2009).DOI:10.1520/B0545-13.2For 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 B571 Practice for Qualitative Adhesion Testing of MetallicCoatingsB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB659 Guide for Measuring Thickness of Metallic and Inor-ganic CoatingsB678 Test Method for Solderability of Metallic-CoatedProductsB697 Guide for Selection of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsB765 Guide for Selection of Porosity and Gross Defect Testsfor Electrodeposits and Related Metallic CoatingsB809 Test Method fo