ASTM_A_309_-_01_2012.pdf

Designation:A30901(Reapproved 2012)Standard Test Method forWeight and Composition of Coating on Terne Sheet by theTriple-Spot Test1This standard is issued under the fixed designation A309;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.This test method replaces Method 511.1 of Federal Test Method Standard No.151b.1.Scope1.1 This test method covers the determination of the weightand composition of coating on terne sheet by the triple-spotmethod.The following three procedures are described:1.1.1 Procedure AStripping with sulfuric acid.1.1.2 Procedure DStripping with hydrochloric acid andantimony trichloride.1.1.3 Procedure EStripping with hydrobromic acid-bromine solution.NOTE1Procedure B(Electrolytic Stripping)and Procedure C(Strip-ping with Silver Nitrate Solution),formerly in this test method,werediscontinued because lack of usage.The designation for Procedure D andProcedure E are retained to avoid future confusion when reference is madeonly to the procedure designation.1.2 If the percent of tin in the coating is required,strippingwith hydrobromic acid-bromine is the preferred procedure.Steel with a predeposited electrolytic nickel coating requires atwo-stage stripping method to determine total tin content.Ifboth the tin and lead percentage are required,stripping withsulfuric acid is recommended,but caution is advised since thesulfuric acid procedure has been found to produce high tinresults(see Section 11).1.3 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 Section 5,Note 2,and Section 17.2.Referenced Documents2.1 ASTM Standards:2A308/A308M Specification for Steel Sheet,Terne(Lead-TinAlloy)Coated by the Hot-Dip ProcessE50 Practices for Apparatus,Reagents,and Safety Consid-erations for Chemical Analysis of Metals,Ores,andRelated MaterialsE57 Methods for ChemicalAnalysis of White Metal BearingAlloys(Withdrawn 1986)3E173 Practice for Conducting Interlaboratory Studies ofMethods for Chemical Analysis of Metals(Withdrawn1998)33.Significance and Use3.1 A coating of terne metal on iron or steel articles isintended to provide drawability,solderability,or corrosionresistance,or combination thereof,which can require differentamounts of coating.Specifications for terne-coated sheetsfrequently provide for these different classes(weights)ofcoating so that purchasers can select that most suitable for theirneeds.This test method provides a means of determining theweight of coating for comparison with the material specifica-tion requirements.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,1This is under the jurisdiction of ASTM Committee A05 on Metallic-CoatedIron and Steel Products and is the direct responsibility of Subcommittee A05.07 onMethods of Testing.Current edition approved Sept.1,2012.Published October 2012.Originallyapproved in 1947.Last previous edition approved in 2007 as A309-01(2007).DOI:10.1520/A0309-01R07.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 where such specifications are available.4Other 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.5.Hazards5.1 For precautions to be observed in the use of certainreagents in this test method,reference shall be made toPractices E50.Particular precaution should be observed whenusing the hydrobromic acid-bromine stripping solution(Proce-dure E)as described in Section 17.6.Test Specimens6.1 Test specimens for weight of coating shall be obtainedas prescribed in Specification A308/A308M.6.2 Specimens shall be 2.25 6 0.01 in.(57.15 6 0.25 mm)square or 2.54 6 0.01 in.(64.52 6 0.25 mm)in diameter,except that for material narrower than 2.25 in.in width,testspecimens shall be of such a length that the area of thespecimen is equal to 5.08 in.2(3277 mm2).The weight ofcoating in grams on a specimen 5.08