dacromet达克罗技术

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1、DACROMET320isanon-electrolyticwater-basedthin-filmcoatingforthecorrosionprotectionofarticlesmadefromsteel,castironorotherironmetals.TheCoatingContainsZincandaluminiumflakesinachromiumbinder.Thecoatingismetallicsilverinappearance.DACROTIZINGistheprocesswherebytheaqueousdisper

2、sionisappliedbycoldimmersionorsprayandisthereforefreeofanyriskofhydrogenembrittlement.Thecoatingthusproducedispassivatedthroughoutthefilmandprovideshighperformancecorrosionprotection.CHARACTERISTICSThecorrosionresistanceofDACROMENT320dependsuponthethicknessofthecoatingandisd

3、uetothecombinationofseveralmechanisms:Abarriereffectduetothetile-likestructureofthefilm,Controlledsacrificialprotectionofthezincinrelationtothemetalsubstrate,Thefilmpassivationwhichreducesthespeedatwhichthezincandaluminumareconsumed.COATINGTHICKNESSTwocoatingweightsarecommon

4、lyusedtomeettheautomobileindustry’srequirements;GradeA:coatingweight>24g/m2,averagethickness5to7umGradeB:coatingweight>36g/m2,averagethickness8t010umGreatercoatingweightsmaybeappliedtoincreasethedurationofthecorrosionprotection.PROPERTIES1/NohydrogenembrittlementWhensurfacep

5、reparationisdoneaccordingtorecommendedtechniques,thenon-electrolyticapplicationofthefilmdoesnotinducehydrogenembrittlement.DACROMET320isthereforeespeciallyindicatedforprotectingsecurityparts.2/CorrosionresistanceDACROMET320meetallautomobilemanufacturerspecificationsforthecor

6、rosionprotectionofmechanicalparts.Itisalsoverywellsuitedfornumerousotherapplicationssuchasbuilding,civilengineering,railwayequipment…2.1/Saltspraytest(ISO9227):>600hours(GradeA)withoutredrust.>1000hours(GradeB)withoutredrust.Nowhiterust(zinccorrosion)before250hours.2.2/Salts

7、praytestafter8hourthermalshockat260℃Ditto2.3/Cyclicalcorrosiontests:3CtestTestmethod:RENAULTD17.1686:>10cycleswithoutredrust2.4/Bimetalliccorrosionresistance:DACROMET320behavesverywellincontactwithaluminiumandperformsaswellasotherzinc-basedcoatingsincontactwithcopper,stainle

8、sssteelormagnesium.3/Resistancetoautomotivefluids:Standardizedtestfuel,dies