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1、Availableon1ineatwww.sciencedirect.cornJOURNALOFScienceDirectRAM&?THBJOURNALOFRAREEARTHS25(2007)537-543www.elsevier.comilocateijreComsionPmtectionofElectm-GalvanizedSteelbyGmenConversionCoatingsMirghasemHosseini*,HabibAshassi-Sorkhabi,HeshmatAllahYaghobkhaniGhiasvand(ElectrochemistryResearch
2、Labordoy,PhysicalChemistryDepmtment,ChemistryFaculty,UniversityofTabriz,Tabriz,Iran)Received28December2006;revised16January2007Abstlact:Acerium-basedchemicalconversionprocesswasstudied.First,zinccoatingobtainedfromafree-cyanidealka-linebath,withderivativeofimidazolwithnewbrightener,wasinvest
3、igated,zinc-platedsteelspecimensweretreatedwithasolutionof50mmol-L-'Ce(NO,),.Thecorrosionbehaviorofbareandtreatedmildgalvanizedsteelwasevaluatedduringexposureto0.5molL-'NaClfordifferentimmersiontime,usingTafelpolarizationcurvesandelectrochemicalimpedancespectroscopy(EIS)measurements.Thesurfa
4、cemorphologyofthecoatingwasstudiedusingscanningelectronmicroscopy(SEM).ThecompositionandchemicalpercentofthecoatingwereexaminedbyX-raydispersionenergy(EDAX).Theresultsofthesemeasurementsshowedthatthenewlydevelopedcerium-basedconversioncoatingprocesswasapromisingcandidateforreplacingtheconven
5、tionalchromatetreatmentsusedatpresentforgalvanizedsteel.Keywords:geencoatingfree-cyanide;alkalinebath;EIS;electro-galvanized;rareearthsCLCnumber:TG14Documentcode:AArticleID:1002-0721(2007)05-0537-07Electroplatedzinccoatingisemployedasactive~ubstitutes'~-~'.Oflatemanyalternativecoatingsgalvan
6、icprotectionforsteel.However,zincisveryhavebeendevelopedbasedonzirconiumandtitaniumreactive,andhighcorrosionratesofthiscoatingaresalts's291,cobaltsalts"0'"I,organicconductivepoly-observedinindoorandoutdoorexposures.ForthismersL12.131,andrareearthHowever,prepa-reasonaposttreatmentisnecessaryt
7、oincreasetheli-rationandcorrosionbehaviorofthesecoatingarenotfetimeofzinccoatings.Incurrentindustrialpractice,clearandtheirpracticalusageisdoubtful.TofindanthistreatmentconsistsofimmersioninachemicalalternativetreatmenttoCr6+conversioncoating,sev-b
