ASTM_B_866_-_95_2013.pdf

Designation:B86695(Reapproved 2013)Standard Test Method forGross Defects and Mechanical Damage in Metallic Coatingsby Polysulfide Immersion1This standard is issued under the fixed designation B866;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.1.Scope1.1 This test method covers equipment and methods fordetecting gross defects and mechanical damage(includingwear-through)in metallic coatings where the breaks in thecoating penetrate down to a copper or copper alloy substrate.1.2 This test method is suitable for coatings consisting ofsingle or combined layers of any coating that does notsignificantly tarnish in an alkaline polysulfide solution.Ex-amples are gold,nickel,tin,tin-lead,and palladium,or theiralloys.1.3 Recent reviews of porosity testing(which include thosefor gross defects)and testing methods can be found inliterature.2,3An ASTM guide to the selection of porosity andgross defect tests for electrodeposits and related metalliccoatings is available as Guide B765.Other related porosity teststandards are Test Methods B735,B741,B798,B799,andB809.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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:4B246 Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical PurposesB374 Terminology Relating to ElectroplatingB488 Specification for Electrodeposited Coatings of Goldfor Engineering UsesB542 Terminology Relating to Electrical Contacts and TheirUseB545 Specification for Electrodeposited Coatings of TinB605 Specification for Electrodeposited Coatings of Tin-Nickel AlloyB679 Specification for Electrodeposited Coatings of Palla-dium for Engineering UseB689 Specification for Electroplated Engineering NickelCoatingsB733 Specification for Autocatalytic(Electroless)Nickel-Phosphorus Coatings on MetalB735 Test Method for Porosity in Gold Coatings on MetalSubstrates by Nitric Acid VaporB741 Test Method for Porosity In Gold Coatings On MetalSubstrates By Paper Electrography(Withdrawn 2005)5B765 Guide for Selection of Porosity and Gross Defect Testsfor Electrodeposits and Related Metallic CoatingsB798 Test Method for Porosity in Gold or Palladium Coat-ings on Metal Substrates by Gel-Bulk ElectrographyB799 Test Method for Porosity in Gold and PalladiumCoatings by Sulfurous Acid/Sulfur-Dioxide VaporB809 Test Method for Porosity in Metallic Coatings byHumid Sulfur Vapor(“Flowers-of-Sulfur”)3.Terminology3.1 Definitions:Many terms used in this test method aredefined in Terminologies B374 or B542.3.2 Definitions of Terms Specific to This Standard:3.2.1 defect indicationsblack or dark colored productsresulting from the reaction between the alkaline polysulfidereagent and exposed copper or copper alloy underlying metal.3.2.2 gross defectsbreaks in the coating that expose rela-tively large areas of underlying metal to the environment(compare with intrinsic porosity(3.2.3).Gross defects include1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.Current edition approved Dec.1,2013.Published December 2013.Originallyapproved in 1995.Last previous edition approved in 2008 as B866 95(2008).DOI:10.1520/B0866-95R13.2Clarke,M.,“Porosity and Porosity Tests,”in Properties of Electrodeposits,edited by Sard,Leidheiser,and Ogburn,The Electrochemical Society,1975,p.122.3Krumbein,S.J.,“Porosity Testing of Contact Platings,”Trans.Connectors andInterconnection Technology Symposium,Philadelphia,PA,October 1987,p.47.4For 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.5The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 those produced by mechanical damage and wear,in addition toas-plated large pores(with diameters an order of magnitudegreater than intrinsic porosity)and networks of microcracks.NOTE1Such large pores and microcrack networks indicate seriousdeviations from acceptable coating practice(as,for example,dirtybasis-metal substrates and contaminated or out-of-balance plating baths).3.2.3 intrinsic porositythe“normal”porosity that ispresent,to some degree,