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1、GENERALMOTORSENGINEERINGSTANDARDSMaterialsandProcesses-ProceduresACCELERATEDCORROSIONTESTGM9540PSUPERCEDEDDoNotUseonNewPrograms;ReplacedbyGMW148721SCOPE.Thisproceduredescribesanacceleratedlabo-durationsCandDoranymodifiedtestaretobeusedforvali-ratorycorrosiontestmeth
2、odtoevaluateassembliesanddationanddevelopmentpurposes.components.Thetestprocedureprovidesacombinationof1.1Thetestmethodiscomprisedof1.25%(0.9%sodiumcyclicconditions(saltsolution,varioustemperatures,humid-chloride,0.1%calciumchlorideand0.25%sodiumbicarbon-ity,andambi
3、entenvironment)toacceleratemetalliccorrosion.ate)saltmistapplicationscoupledwithhightemperatureandTheprocedureiseffectiveforevaluatingavarietyofcorrosionhighhumidityandmoderatelyhightemperaturedryoff.Itmechanisms,suchasgeneral,galvanic,crevice,etc.Thetestrequiresa16
4、hworkdayoranautomaticcyclingtestchamber.durationcanbeindividuallytailoredtoachieveanydesiredIMPORTANT:Engineeringdrawingsandmaterialspecifica-levelofcorrosionexposure.tionsthatreferencethistestproceduremustspecifythetestduration,(A,B,CorD)orthenumberoftestcyclesasin
5、di-Also,synergisticeffectsduetotemperature,mechanicalandcatedinTable1.(Example,GM9540P,TestDurationB.)Inelectricalcyclingcanbecomprehendedbythistest.Seeaddition,thecriteriaformakingpass/faildeterminationsmustAppendixAfortypicalmodifications.bespecified.Testdurations
6、AandBcanbeusedforqualitycontrolandvalidationproceduresasappropriate.LongertestNOTE:TestdurationsAandBcanbeusedasbothQCtestsdurations(CandD)andtestsinvolvingmodificationsaretobeandvalidationtestsdependingonthepurposeofthetest.Testusedforvalidationpurposesonly.TABLE1-
7、CYCLES(APPROXIMATE)FORTARGETMASSLOSSTestDurationABCDTestMethod8Cycles16Cycles40Cycles80CyclesCouponsRequired241020(mm)TABLE2-MASSLOSSTARGETRANGES,mg*(ATTHEENDOFTEST)InitialCouponThicknessTestDurationmminABCD0.791/32828-12281496-18963210-38106038-66381.591/16874-1274
8、1574-19743378-39786345-69453.181/8965-13751731-21313712-43126957-75576.351/41147-15472043-24434379-49798178-8778*Thesemasslossvaluescorres
