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JAPANESEAUTOMOBILESTANDARDJASOM610-92TypeoftestpiecePaintedSurfacetreatedotherthanpaint,NottreatedCosmeticcorrosiontestmethodforautomotivepartsPreparationConditionsCuttingHeating2parallelcutstothebase(80*5)OCor(120f1O)Cx30min.1.ScopeThisstandardspecifiesamethodtoexaminecosmeticcorrosionofmetalicmaterialandcorrosiontest.surfacetreatmentforautomotivepartsbycycliccorrosiontest.3.TypeoftestThetypeoftestshallbeclassifiedasCyclic4.TestingmethodThetestingmethodissuchthatatestpieceRemark:Applicablestandardsofthisstandardareshownasfollows.JISC2388JISG4401JISK1503JISK5400JISK5538JIS21524JIS22371JASOM6092.DefinitionsPressure-sensitivepolyesteradhesivetapesforelectricalinsulationCarbontoolsteelsAcetonTestingmethodsfororganiccoatingsLucquerthinnerPressuresensitiveadhesivepolyvinylchloridetapesforpackagingMethodofsaltspraytestingCorrosiontestmethodforauto-motivematerialspreparedbyaspecifiedmethodshallberepeatedlyexposedinacyclicatmosphereconsistingofsaltspraying,dryingandwettingmaintainedunderaspecifiedconditionsoastoevaluatecosmeticcorrosionsonabasemetalandasurfacetreatment.5.TestconditionsThepreparationconditionsandthetestconditionsshallbeasshowninTable1andTable2resDectivelv.Definitionsofmajortermsusedinthisstandardshallbeasfollows.Astothe'heating'conditionsinpreparation,takingaccountofenvironmentalconditionswherethepartsareused,theyshallbedeter-minedasagreeduponbetweenthepurchaserandthemanufacturer.CosmeticcorrosionAcorrosiontodamagepartsappearancesuchaspittingandentirecorrosionwhichiscausedbysuchoutsideenvironmentalfactorsasrain-water,sunshine,andsaltformeltingsnow.SurfacetreatmentSuchtreatmentsaspainting,plating,chemicaltreatmentandanodizationwhichareprocessedfordecorationandanticorrosion.CycliccorrosiontestAtestinwhichacyclicatmosphereconsistingofsaltwaterspraying,dryingandwettingisrepeatedinordertoapproximateandactivateanaturalenvi-ronment.Table1Preparationconditions1JAS0M610-92Item1.Saltwaterspraying(2)Densityofsalt(1Temperature2.Drying(1)Temperature(2)Relativehumidity(iTemperature(2)Relativehumidity4.Durationandcontentpercycle3.Wetting5.Timerequiredinchangingcondition(Timesrequiredtoreachthetemperatureandrelativehumidityspecifiedforthatconditionafterchangingtothecondition.)6.TestpatternCondition35f1°C5+0.5%OthersshallconformtoJIS2237160+l0c20-30%RH50+1°C95%RHandover8hoursSaltspraying:2hoursDrying:4hoursWetting:2hours(includingtimeforeachchangerespectively)Fromsprayingtodrying:within30minutesFromdryingtowetting:within15minutesFromwettingtospraying:within30minutes(Sprayingshallbe,inprinciple,momentary)60-.oF!50-2E40-13cF:i-30~EvaluationfaceoftestpieceshallbeheldatanIangleof15-20totheverticalline~~7.Testpieceholdingangle-withinwithin-within30min30min30min--6.Testapparatusandinstrument(1)TestapparatusThetestapparatustoberequiredforthistestshallconsistofthesaltsprayingtower,tankofsaltwaterfortest,testpieceholder,collectingcontainerforsprayedsolution,testingbathequippedwithatemperatureregulator,saltwatersupplytank,compressedairsupplier,humidifier,dryairsupplier,exhauster,andothernecessarydevices.Thetestapparatusshallsatisfytosetupthespecifiedtestconditionsaswellastheconditionsrequiredasfollows.(a)Thetestingbathshallhavecapacityof0.4m3andover.However,theshapeanddimensionshavenorestriction.(b)Theceilingortopcoverofthetestingbathshallbesodesignedthatthesolutiondepositedonthatplacedoesnotdropoffontothetestpiece.(c)Corrosionresistivematerialsshallbeusedfortheapparatus.(d)Theconstructionoftheapparatusshallbesodesignedthatthetem-peratureandsprayedsaltwaterinthetestingbathshallnotbeinflu-encedfromtheoutsideair,andthesolutiondroppedfromthetestpieceshallnotbereusedforfurthertests.2JAS0M610-92Thetestpieceholdershallholdthetestpieceatthespecifiedangle.Thecollectingcontainerforsprayedsolutionshallbeacleancontainerhavingahorizontalcollectingareaofof80cm2andlocatedatleasttwopositionswheretheuniformityofsaltwatersprayingmaybecon-firmed.(3)Forexample,oneislocatedataplacenearthetestpiece,anotherislocatedataplacenearthesaltwatersprayingtower,andtheotherislocatedataplacefaraway.Thehumidifiershallhaveacapa-bilitytosetuptothespecifiedwettingcondition.Thedryairsuppliershallhaveacapabilitytosetuptothespecifieddryingcondition.Theexhaustershallbesodesignedthatthesaltwatersprayingisnotinfluencedfromtheoutsidewind(5)pressure.Themaintenancecontrolofthetestapparatusshallbeproperlyachievedsoastoalwaysobtainthespecified(2)(4)PointmicrometerThisisaninstrumenttomeasurethepositionatwhichtheplatethicknessisdecreasedbycorrosions,anditshallhavecapabilitytomeasurearangeof1/1000mm.However,analternativeinstrumentmaybeusedifithascapabilitytomeasuretheequivalentrange.TapesformaskingThetapesshallbeusedformaskingaportiononatestpiecewhereshallnotbesubjectedtoatest,thusitshallprotectthemaskedportionfromsaltwaterandmoisture,andshallbefreefrompeelingoffduringatest.ThepolyesteradhesivetapesconformingtotherequirementsspecifiedinJISC2338aresuitableforthispurpose.Tapesforpeeling-offClothadhesivetapesSpecifiedinJIS21524havingwidthof25mmorequiva-lentshallbeused.Cutterkn¡f