ASTM_B_767_-_88_2016.pdf

Designation:B76788(Reapproved 2016)Standard Guide forDetermining Mass Per Unit Area of Electrodeposited andRelated Coatings by Gravimetric and Other ChemicalAnalysis Procedures1This standard is issued under the fixed designation B767;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 guide outlines a general method for determiningthe mass per unit area of electrodeposited,electroless,mechanically-deposited,vacuum-deposited,anodicoxide,andchemical conversion coatings by gravimetric and other chemi-cal analysis procedures.1.2 This guide determines the average mass per unit areaover a measured area.1.3 The stripping methods cited are described in specifica-tions or in the open literature or have been used routinely by atleast one laboratory.1.4 The procedures outlined can be used for many coating-substrate combinations.They cannot be used where the coatingcannot be separated from the substrate by chemical or physicalmeans as would be the case if white brass were plated withyellow brass.1.5 In principle,these procedures can be used to measurevery thin coatings or to measure coatings over small areas,butnot thin coatings over small areas.The limits depend on therequired accuracy.For example,2.5 mg/cm2of coating mightrequire 2.5 mg of coating covering 1 cm2,but 0.1 mg/cm2ofcoating would require 25 cm2to obtain 2.5 mg of coating.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 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:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA309 Test Method for Weight and Composition of Coatingon Terne Sheet by the Triple-Spot Test(Withdrawn 2015)3A428/A428M Test Method for Weight Mass of Coating onAluminum-Coated Iron or Steel ArticlesB137 Test Method for Measurement of Coating Mass PerUnit Area on Anodically Coated AluminumB449 Specification for Chromates on Aluminum2.2 British Standards Institution Documents:4BS 729 Hot Dip Galvanized Coatings on Iron and SteelArticles,Specification forBS 1706 Electroplated Coatings of Cadmium and Zinc onIron and Steel,Specification forBS 1872 Electroplated Coatings of Tin,Specification forBS 3189 Phosphate Treatment of Iron and Steel,Specifica-tion forBS 3382 Electroplated Coatings on Threaded Components,Specification forBS 3597 Electroplated Coatings of 65/35 Tin-Nickel Alloy,Specification for2.3 Government Standards:2.3.1 DOD Standard:5DOD-P-16232F Phosphate Coatings,Heavy,Manganese orZinc Base(for Ferrous Metals)2.3.2 Federal Standards:6FED-STD 151b Metals;Test Methods:Test 513.1 for Weightof Coating on Hot Dip Tin Plate and Electrolytic Tin Plate1This guide is under the jurisdiction of ASTM Committee B08 on Metallic andInorganic Coatings and is the direct responsibility of Subcommittee B08.10 on TestMethods.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1987.Last previous edition approved in 2010 as B767 88(2010).DOI:10.1520/B0767-88R16.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from British Standards Institute(BSI),389 Chiswick High Rd.,London W4 4AL,U.K.5Available from Standardization Documents Order Desk,DODSSP,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA 19111-5098.6Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 RR-T-51D Tableware and FlatwareSilverplated2.3.3 Military Standard:5MIL-M-45202C Magnesium Alloys,Anodic Treatment of2.4 ISO Standards:7ISO 2081 Metallic CoatingsElectroplated Coatings ofZinc on Iron or SteelISO 2082 Metallic CoatingsElectroplated Coatings onCadmium on Iron or SteelISO 2093 Metallic CoatingsElectrodeposited Coatings ofTin,Annex BISO 2106 Anodizing of Aluminum and its AlloysDetermination of Mass Per UnitArea(Surface Density)ofAnodic Oxide CoatingsGravimetric MethodISO 3892 Conversion Coatings on Metallic MaterialsDetermination of Coating Mass Per Unit AreaGravimetric MethodsISO 4522/1 Metallic CoatingsTest Methods for Electrode-posited Silver and Silver