GMNA GM4298P-1997 SALT SPRAY TEST

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1、VND.GMGH4278P-ENGLI,997-+l0b377OUll=i=lib9i7-GENERALMOTORSENGINEERINGSTANDARDSMaterialsandProcesses-ProceduresIIISALTSPRAYTESTGM4298P1SCOPE.Thisstandardcoverstherequirementsneces-6.2ThepHofthecollectedsolutionmustbeinthepHrangesarytoattaintheconditionsfou

2、ndinaneutralsaltspraytestof6.5to7.2.ThepHofthecollectedsolutionshallbecheckedcabinet.andrecordeddaily.Readingsonweekendsneednotbetaken.ThepHmeasurementshallbemadeelectronicallyusinga1.1ThechamberoperationisbasedonASTMB117withtheglasselectrodewithasaturate

3、dpotassiumchloridebridgefollowingclarifications.(mildagitationisrecommended).ThepHofthecollectedsolu-1.2ThesaltspraytestisbettersuitedforqualitycontrolandtionwillbehigherthanthepHoftheoriginalsolutionduetoprocesscontrolevaluations.Othertestsmaybebettersui

4、tedtothelossofcarbondioxideatthehighertemperature.ThepHofsimulatefieldperformance.themakeupsolutionmaybeadjustedwiththeadditionofsmallamountsofhydrochloricacid@ICI)orsodiumhydrox-2REFERENCEDSTANDARDS.ide(NaOHJsolution.GM4298PGM9102PASTMD11936.3Specificgra

5、vityofthecollectedsolutionshallbe1.0255GM4465PASTMB117to1.0400whenmeasuredat25-C.3PREPARATIONOFTESTSPECIMENS.7ATOMIZATIONANDQUALITYOFFOG.3.1Themethodsofapplication,filmthickness,curingand7.1Chesttypecabinetsrequire1fogcollectorforevery0.55conditioningofth

6、etestsurfaceshallbeasspecified,consistentsquaremeter(6squarefeet)oftestarea.Thelarger,walkinwiththenormalproductionpractices(cleaning,pretreatment,typetestcabinetsrequire1fogcollectorforevery1.40squareetc.).meter(15squarefeet).Thecollectorsmustbeplacedwit

7、hin3.2Thebacks,cutedgesofplated,coated,orduplexmateri-theexposurezonesothatnodropsofsolutionfromthetestalsandthoseareascontainingidentificationmarksorinspecimensoranyothersourceshallentercollectors.Thecol-contactwithracksorsupportsshallbeprotectedwithasui

8、t-lectorsshallbeplacedintheproximityofthetestspecimensablecoatingthatisstableundertheconditionsofthetest.andatthesameheightasthetestspecimens.Collectorsshallbeevenlydistributedtoproducearepresentativemeasureof3.3Spe