不锈钢化学转化膜耐蚀性能的研究

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1、西北_[业大学硕士学位论文ABSTRACTPreparationofcoloredstainlesssteelusuallytakesadvantageofchemicalcolouringmethod,whichisthemainlymeanstoobtaincoloredfilm.Theshapeofmaterialscanbeverycomplicatedandthecoloringwillbeuniformbychemicalcolouring,whicharemeritsofit.However,thecolourrecurringisdificultfor

2、chemicalcolouring.Atpresent,allthestudyworkonchemicalcolouringbasedonINCOmethod,andthecomponentofcolouringsolutionsare:Cr03200-300g/L,H2SO4250-500g几，temperature80^900C.TheoxideofCr,FeandNiwillbeformedonstainlesssteelsurfacebycolouringprocesses.Thecolouroffilmchangedwiththickness.Thepote

3、ntialofstainlesssteelchangedwithtimeduringcolouringprocesses.Thereiscorrelativerelationbetweenthepotentialdiferenceandcolourofstainlesssteel.Thecorrelativecoloredfilmscanbeobtainedbycontrollingthecorrelativepotentialdiferences.Thecorrosionresistanceofcoloredfilmissuperiortostainlessstee

4、l.Variouscoloredfilmhavediferentcorrosionresistance,whichdependsontheelementdistributesandconfigurationoffilm.Basedonsomeimportantresultsandconclusionfrompreviouswork,majorcontentofthispaperislistedasfollows:(1)Eperimentofchemicalcolouringof1Crl8Ni9Tistainlesssteelwithproperadditivesadd

5、edtoCr03姚S04colouringsolutionisstudied.ThecoloredfilmwiththebestcorrosionresistanceisobtainedbycolouringwiththeprocessesofCrO3250g/L.H2SO4270m1/L,properadditives20g几，colouringtemperature50'C,time30minoTheresultsshowthattheadditionofproperadditivescanimprovethecolouringspeedanddecreaseco

6、louringtemperature30^400C.(2)Thepotential-timecurveduringcolouringmeasured,andtheefectofamountofadditivesandtimeoncolouringprocessesofstainlesssteelarediscussed.Thepotentialdiferencesofseveralcoloredfilmwithdiferentcolourareconfirmedaccordingtothepotential-timecurves,andthecorrelativere

7、lationbetweenthepotentialdiferenceandcolourofstainlesssteelisdiscussed.Thecorrelativecoloredfilmscanbeobtainedbycontrollingthecorrelativepotentialdiferences,whichimprovedthecolourrecurringofchemicalcolouringprocessessuccessfully.(3)Theelectrochemistrystabilityofcoloredfilmisstu