Designation:G103−97(Reapproved2011)StandardPracticeforEvaluatingStress-CorrosionCrackingResistanceofLowCopper7XXXSeriesAl-Zn-Mg-CuAlloysinBoiling6%SodiumChlorideSolution1ThisstandardisissuedunderthefixeddesignationG103;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONContinuousimmersioninboiling6%sodiumchloridesolutionhistoricallywasconsideredtobeaneffectiveacceleratedSCCtestingmediumforallAl-Zn-Mg-Cualloys(1,2),2butinmorerecentyears,alternateimmersionin3.5%sodiumchloridesolution(PracticeG44)hasbecomethefavoredtestmediumforthehighcopper(1.2to2.6%Cu)7XXXseriesalloys(3,4).Evidencetodateshows,however,thattheboiling6%sodiumchloridemediumcorrelatesbetterwithoutdooratmosphericexposurethanPracticeG44forthe7XXXseriesalloyscontaininglittleornocopper(5,6,7,8).1.Scope1.1Thispracticeprimarilycoversthetestmediumwhichmaybeusedwithavarietyoftestspecimensandmethodsofapplyingstress.Exposuretimes,criteriaoffailure,andsoon,arevariableandnotspecified.1.2Thisstress-corrosiontestingpracticeisintendedforstaticallyloadedsmoothnon-weldedorweldedspecimensof7XXXseriesAl-Zn-Mg-Cualloyscontaininglessthan0.26%copper.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SeeSection8foradditionalprecautions.2.ReferencedDocuments2.1ASTMStandards:3B580SpecificationforAnodicOxideCoatingsonAlumi-numD1193SpecificationforReagentWaterG30PracticeforMakingandUsingU-BendStress-CorrosionTestSpecimensG38PracticeforMakingandUsingC-RingStress-CorrosionTestSpecimensG39PracticeforPreparationandUseofBent-BeamStress-CorrosionTestSpecimensG44PracticeforExposureofMetalsandAlloysbyAlternateImmersioninNeutral3.5%Sod...
