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1、ElectrochimicaActa49(2004)29452954Electrochemicalbehaviorofzinc-richpowdercoatingsinartificialseawaterH.Marchebois,C.Savall,J.Bernard,S.Touzain∗Laboratoired’EtudedesMateriauxenMilieuxAgressifs,UFRSciences,UniversitédeLaRochelle,EA3167,AvenueMichelCrepeau,17042LaRochelleCedex1,F
2、ranceReceived9May2003;accepted6January2004Availableonline10April2004AbstractZinc-richpaints(ZRP)areoneofthemosteffectivecoatingsusedinordertoprotectsteelfromcorrosionandtheyhavebeenstudiedinmanyaggressivemedialikeseawater,marineandindustrialenvironments.Amajordrawbackofclassic
3、solvent-basedpaintistheemissionofvolatileorganiccompounds(VOC),whichcontributetoatmosphericpollution.Sincethe1970s,powdercoatingsareoftenpreferred,becausetheyareonlycomposedofdrythermosettingpowderswithoutorganicsolventsotheyabidebyenvironmentalstandards.Inthiswork,threesingle
4、-coatzinc-richpowdercoatingswereimmersedinartificialseawater.Theseformulationsareepoxy-basedandcontainacomplexmixtureofzincdustwhichrepresents50or70wt.%.ThiszincconcentrationiswellbelowtheoneusuallyreportedwithliquidZRPsand,forthethirdformulation,conductivepigments(carbonblacks
5、)wereadded.Theirelectrochemicalbehaviorswerecompared,usingelectrochemicalimpedancespectroscopy(EIS)andmicro-Ramanspectroscopy.Itwasfoundthatporosityandelectrochemicalbehaviorareintimatelyrelatedtotheconductivepigmentpresenceinthecoating.Fortwoofthethreeformulationstested,EISsp
6、ectracanbeexplainedwithclassicalmodels.Acontrario,thethirdonebehavesdifferentlyandatransmissionlinemodel(modifieddeLeviestype)wasusedtoaccountforallcontributions.©2004ElsevierLtd.Allrightsreserved.Keywords:Powdercoating;Zinc-richpaint;Cathodicprotection;Electrochemicalimpedance
7、spectroscopy;Micro-Ramanspectroscopy1.Introductionorganiccompounds(VOC).Thatisthereasonwhypowdercoatingsareoftenpreferred,becausetheyarecomposedofSolvent-basedzinc-richpaints(ZRP)arewellknowndrythermosettingpowders.asefficientorganiccoatingstoprotectmetallicsubstratesHowever,th
8、ezinccontentinpowderZRPsisusuallyfromcorrosion[115].Zincdusti
