ASTM_G_1_-_03_2011.pdf

Designation:G103(Reapproved 2011)Standard Practice forPreparing,Cleaning,and Evaluating Corrosion TestSpecimens1This standard is issued under the fixed designation G1;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers suggested procedures for preparingbare,solid metal specimens for tests,for removing corrosionproducts after the test has been completed,and for evaluatingthe corrosion damage that has occurred.Emphasis is placed onprocedures related to the evaluation of corrosion by mass lossand pitting measurements.(WarningIn many cases thecorrosion product on the reactive metals titanium and zirco-nium is a hard and tightly bonded oxide that defies removal bychemical or ordinary mechanical means.In many such cases,corrosion rates are established by mass gain rather than massloss.)1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 specificwarning statements,see 1.1 and 7.2.2.Referenced Documents2.1 ASTM Standards:2A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsD1193 Specification for Reagent WaterD1384 Test Method for Corrosion Test for Engine Coolantsin GlasswareD2776 Methods of Test for Corrosivity of Water in theAbsence of Heat Transfer(Electrical Methods)(With-drawn 1991)3G15 Terminology Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G16 Guide for Applying Statistics to Analysis of CorrosionDataG31 Practice for Laboratory Immersion Corrosion Testing ofMetalsG33 Practice for Recording Data from Atmospheric Corro-sion Tests of Metallic-Coated Steel SpecimensG46 Guide for Examination and Evaluation of Pitting Cor-rosionG50 Practice for Conducting Atmospheric Corrosion Testson MetalsG78 Guide for Crevice Corrosion Testing of Iron-Base andNickel-Base Stainless Alloys in Seawater and OtherChloride-Containing Aqueous Environments3.Terminology3.1 See Terminology G15 for terms used in this practice.4.Significance and Use4.1 The procedures given are designed to remove corrosionproducts without significant removal of base metal.This allowsan accurate determination of the mass loss of the metal or alloythat occurred during exposure to the corrosive environment.4.2 These procedures,in some cases,may apply to metalcoatings.However,possible effects from the substrate must beconsidered.5.Reagents and Materials5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society where1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.05 on LaboratoryCorrosion Tests.Current edition approved Dec.1,2011.Published April 2012.Originallyapproved in 1967.Last previous edition approved in 2003 as G12003.DOI:10.1520/G0001-03R11.2For 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 such specifications are available.4Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water as definedby Type IV of Specification D1193.6.Methods for Preparing Specimens for Test6.1 For laboratory corrosion tests that simulate exposure toservice environments,a commercial surface,closely resem-bling the one that would be used in service,will yield the mostmeaningful results.6.2 It is desirable to mark specimens used in corrosion testswith a unique designation during preparation.Several tech-niques may be used depending on the type of specimen andtest.6.2.1 Stencil or StampMost metallic specimens may bemarked by stenciling,that is,imprinting the designation codeinto the metal surface using hardened steel stencil stamps hitwith a hammer.The resulting imprint will be visible even aftersubstantial corrosion has occurred.However,this procedureintro