Designation:G34−01(Reapproved2013)StandardTestMethodforExfoliationCorrosionSusceptibilityin2XXXand7XXXSeriesAluminumAlloys(EXCOTest)1ThisstandardisissuedunderthefixeddesignationG34;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcoversaprocedureforconstantim-mersionexfoliationcorrosion(EXCO)testingofhigh-strength2XXXand7XXXseriesaluminumalloys.NOTE1—Thistestmethodwasoriginallydevelopedforresearchanddevelopmentpurposes;however,itisreferenced,inspecificmaterialspecifications,asapplicableforevaluatingproductionmaterial(refertoSection14onPrecisionandBias).1.2Thistestmethodappliestoallwroughtproductssuchassheet,plate,extrusions,andforgingsproducedfromconven-tionalingotmetallurgyprocess.1.3Thistestmethodcanbeusedwithanyformofspecimenorpartthatcanbeimmersedinthetestsolution.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterE3GuideforPreparationofMetallographicSpecimensG15TerminologyRelatingtoCorrosionandCorrosionTest-ing(Withdrawn2010)3G112GuideforConductingExfoliationCorrosionTestsinAluminumAlloys2.2ASTMAdjuncts:Illustrations(EnlargedGlossyPrints)43.Terminology3.1Definitions:3.1.1exfoliation—corrosionthatproceedslaterallyfromthesitesofinitiationalongplanesparalleltothesurface,generallyatgrainboundaries,formingcorrosionproductsthatforcemetalawayfromthebodyofthematerialgivingrisetoalayeredappearance(TerminologyG15).4.SummaryofTestMethod4.1Thistestmethodprovidesanacceleratedexfoliationcorrosiontestfor2XXXand7XXXser...
