Designation:G44−99(Reapproved2013)StandardPracticeforExposureofMetalsandAlloysbyAlternateImmersioninNeutral3.5%SodiumChlorideSolution1ThisstandardisissuedunderthefixeddesignationG44;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thispracticecoversproceduresformakingalternateimmersionstresscorrosiontestsin3.5%sodiumchloride(NaCl)(Note1).Itisprimarilyfortestsofaluminumalloys(TestMethodG47)andferrousalloys,butmaybeusedforothermetalsexhibitingsusceptibilitytochlorideions.Itsetsforththeenvironmentalconditionsofthetestandthemeansforcontrollingthem.NOTE1—Alternateimmersionstresscorrosionexposuresaresome-timesmadeinsubstituteoceanwater(withoutheavymetals)preparedinaccordancewithSpecificationD1141.Thegeneralrequirementsofthispresentpracticearealsoapplicabletosuchexposuresexceptthatthereagentsused,thesolutionconcentration,andthesolutionpHshouldbeasspecifiedinSpecificationD1141.1.2Thispracticecanbeusedforbothstressedandun-stressedcorrosionspecimens.Historically,ithasbeenusedforstress-corrosioncrackingtesting,butisoftenusedforotherformsofcorrosion,suchasuniform,pitting,intergranular,andgalvanic.1.3Thispracticeisintendedforalloydevelopmentandforapplicationswherethealternateimmersiontestistoserveasacontroltestonthequalityofsuccessivelotsofthesamematerial.Therefore,stricttestconditionsarestipulatedformaximumassurancethatvariationsinresultsareattributabletovariationsinthematerialbeingtested.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bi...
