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1、Surface&CoatingsTechnology188–189(2004)762–767www.elsevier.com/locate/surfcoatDevelopmentofenvironmentallyfriendlynonchromeconversioncoatingforelectrogalvanizedsteelHyung-JoonKima,*,JinmingZhangb,Roe-HoanYoonb,1,RichardGandourc,2aSurfaceTechnologyResearchGroup,TechnicalResearchLab
2、oratories,POSCO,RepublicofKoreabCenterforAdvancedSeparationTechnologies,VirginiaTech.,Blacksburg,VA24061,USAcDepartmentofChemistry,VirginiaTech.,Blacksburg,VA24061,USAAvailableonline12October2004AbstractThetoxicityofchromiumsaltscreatedenvironmentalandhealth-relatedconcernsandgene
3、ratedagreatdealofinterestindevelopingchrome-freeconversioncoatings.Mostofthenewdevelopmentsarebasedonorganiccoatings.Inthepresentwork,somesilaneswereusedtocoatelectrogalvanized(EG)steelsheetsforcorrosionprotection.Contactanglemeasurement,Tafelstudies,electrochemicalimpedancespectr
4、oscopy(EIS)andsaltspraytests(SST)wereconductedtoinvestigatetheefficiencyoftheorganiccoatingsforthecorrosionprotection.ItwasfoundthatpHofasilanesolutionisimportantintheadsorptionofsilanesontheEGsteelsurfaceand,therefore,affecteditscorrosionresistance.D2004ElsevierB.V.Allrightsreser
5、ved.Keywords:Electrogalvanizedsteelsheets;Corrosionresistance;Saltspraytest1.Introductionhence,hasgeneratedagreatdealofinterestindevelopingchrome-freeconversioncoatings.Mostofthenewdevelop-Mostmetalsarestableonlyunderreducingconditionsmentsarebasedonorganiccoatings,whichcanalsopro
6、tectandcorrodeuponexposuretoanoxidizingambient.Metalsteelfromfingerprintsthatactasseatsforcorrosion.producerscombatthisproblemusingvariousmethods.SteelOfthevariousorganicconversioncoatingsbeingproducersusevariousorganicandinorganiccoatingstodeveloped,perhapsthesilanecouplingagents
7、havereceivedprotectcold-rolledsteel(CRS)sheetsfromcorrosionduringthemostattention.Thesereagentsarecapableofformingshipmentandstorage.Somecoatingsaredesignedtoretardstrongbondstometalsubstratesand,atthesametime,ofcorrosionbycontroloftheelectrochemistry,whileothersformingcross-linki
8、ngpolymersonthesurface,bothofsuch
