ASTM_A_90_-_A_90M_-_13.pdf

Designation:A90/A90M13Standard Test Method forWeight Mass of Coating on Iron and Steel Articles withZinc or Zinc-Alloy Coatings1This standard is issued under the fixed designation A90/A90M;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 Department of Defense.1.Scope*1.1 This test method covers procedures for determining theweight mass of coating on iron or steel sheet,wire,and otherarticles in which the coating is zinc or a zinc alloy,such aszinc-5%aluminum(includingzinc-5%aluminum-mischmetal and zinc-5%aluminum-0.1%magnesium),zinc-aluminum-magnesium(including zinc-5 to 9%aluminum-magnesium and zinc-9 to 13%aluminum-magnesium)or 55%aluminum-zinc.In the body of this test method,reference tozinc coating shall be interpreted to also include zinc alloycoating except where specifically stated otherwise.1.2 The final results determined by this test method shall beexpressed in inch-pound units or SI units,depending on theunits used in the material specification to which the results areto be compared.Certain portions of the procedure involvingdetermination of specimen weight mass have traditionallybeen performed in SI units,and corresponding inch-poundunits are not included.1.3 For sheet products,the final results are expressed aseither coating weight mass total both sides,or coating weightmass separately on each side,depending on the specifiedrequirements.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 specific hazardsstatements see 5.1.2.Referenced Documents2.1 ASTM Standards:2A653/A653M Specification for Steel Sheet,Zinc-Coated(Galvanized)or Zinc-Iron Alloy-Coated(Galvannealed)by the Hot-Dip ProcessA792/A792M SpecificationforSteelSheet,55%Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet,Zinc-5%Alu-minum Alloy-Coated by the Hot-Dip ProcessA1046/A1046M Specification for Steel Sheet,Zinc-Aluminum-MagnesiumAlloy-Coated by the Hot-Dip Pro-cessA1057/A1057M Specification for Steel,Structural Tubing,Cold Formed,Welded,Carbon,Zinc-Coated(Galvanized)by the Hot-Dip ProcessA1063/A1063M Specification for Steel Sheet,Twin-RollCast,Zinc-Coated(Galvanized)by the Hot-Dip ProcessA1079 Specification for Steel Sheet,Complex Phase(CP),Dual Phase(DP)and Transformation Induced Plasticity(TRIP),Zinc-Coated(Galvanized)or Zinc-Iron Alloy-Coated(Galvannealed)by the Hot-Dip ProcessD1193 Specification for Reagent WaterE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Significance and Use3.1 This test method provides a standard method for deter-mining the weight mass of coating for comparison withspecification requirements.A coating of zinc on iron or steelarticles provides protection against corrosion.As the protectionis provided by sacrificial loss of zinc,the degree of protectionis proportional to the weight mass of zinc coating.Specifi-cations for zinc-coated articles frequently provide for differentclasses of coating so that the purchaser can select the coatingweight mass most suitable to his needs.1This test method is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.07 on Methods of Testing.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1923.Last previous edition approved in 2011 as A90/A90M-11.DOI:10.1520/A0090_A0090M-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.*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 States1 4.Reagents4.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.3Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.4.2 Purity of WaterWater used to prepare chemical solu-tions shall be reagent water as defined by Type IV ofSpecification D1193.4.3 Antimony Trichloride SolutionDissolve 20 g of Sb2O3or 32 g of SbCl3in 1000 mL of HCl(