Designation:G150−13StandardTestMethodforElectrochemicalCriticalPittingTemperatureTestingofStainlessSteels1ThisstandardisissuedunderthefixeddesignationG150;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaprocedurefortheevaluationoftheresistanceofstainlesssteelandrelatedalloystopittingcorrosionbasedontheconceptofthedeterminationofapotentialindependentcriticalpittingtemperature(CPT).1.2Thistestmethodsappliestowroughtandcastproductsincludingbutnotrestrictedtoplate,sheet,tubing,bar,forgings,andwelds,(seeNote1).NOTE1—ExamplesofCPTmeasurementsonsheet,plate,tubing,andweldedspecimensforvariousstainlesssteelscanbefoundinRef(1).2Seetheresearchreports(Section14).1.3ThestandardparametersrecommendedinthistestmethodaresuitableforcharacterizingtheCPTofausteniticstainlesssteelsandotherrelatedalloyswithacorrosionresistancerangingfromthatcorrespondingtosolutionan-nealedUNSS31600(Type316stainlesssteel)tosolutionannealedUNSS31254(6%Mostainlesssteel).1.4ThistestmethodmaybeextendedtostainlesssteelsandotheralloysrelatedtostainlesssteelthathaveaCPToutsidethemeasurementrangegivenbythestandardparametersdescribedinthistestmethod.Appropriatetestpotentialandsolutionmustthenbedetermined.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD1293TestMethodsforpHofWaterE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofa...
