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593Vol159No1320083JournalofChemicalIndustryandEngineering(China)March2008EIS31,1,2,1(1,100029;2,102442):(EIS)33315%NaCl,///33,,,:;;:TG174:A:0438-1157(2008)03-0659-06ElectrochemicalcorrosionbehaviorofthreecoatingsystemsbyEISLIUXuwen,XIONGJinping,CAOJingyi,ZUOYu(1SchoolofMaterialsScienceandEngineering,BeijingUniversityofChemicalTechnology,Beijing100029,China;2NavyCoatingAnalysisandTestCenter,Beijing102442,China)Abstract:Theelectrochemicalcorrosionbehaviorofchlorinatedrubbertopcoating(singlelayer),inorganiczinc2richprimer/chlorinatedrubbertopcoating(doublelayer)andinorganiczinc2richprimer/epoxymiddlepaste/chlorinatedrubbertopcoating(tri2layer)in315%NaClsolutionwasstudiedwithelectrochemicalimpedancespectroscopy(EIS)1Aseriesofimpedancespectraofthreecoatingsystemsduringimmersionweremeasured,andtheprotectivepropertieswerecomparedbythespectra1Theresultsshowedthattheprotectivepropertiesofthedoublelayerwasevenworsethanthatofthesinglelayerandtheprotectivepropertiesofthetri2layercoatingwasthebestamongthethreecoatingsystems1Theepoxymiddlepasteplayedaveryimportantroleintheprotectivepropertiesofthecompositecoating.Keywords:coating;EIS;immersion2007-03-08,2007-06-15::(1979),,,,,Receiveddate:2007-03-08.Correspondingauthor:XIONGJinping,associateprofessor.E-mai:xiongjp@mail1buct1edu1cn(2)[1],/[226],EIS,/[728][1],,[9],,33,315%()NaClEIS,,31(1)WB70122613;Q235(2)Q23540mm40mm1mm120#,,3,24h,50m,31(3)315%NaCl,,EISEISEG&GM388,M273A5210,01011100105Hz,10mV3,,(SCE),/,13cm2,315%()NaClZ2View13Table1ThreetypesofcoatingssystemsCoatingsystemnumberCoatingsystemcomponentCoatingthickness1#inorganiczinc2richprimer/epoxymiddlepaste/chlorinatedrubbertopcoating(tri2layer)150m2#inorganiczinc2richprimer/chlorinatedrubbertopcoating(doublelayer)100m3#chlorinatedrubbertopcoating(singlelayer)50m2211EIS11#315%NaCl,1(b)1(c)1(a)1,EIS,,109,,,16h,EIS,,,,48h,EIS,,106cm2,,,,,,,,,192h,,,,EIS:;066591315%NaClFig11EISoftri2layerscoatingsimmersedin315%NaClsolutionfordifferenttime,,,,212EIS22#315%NaCl,,,,,8h,EIS,,,,,,2315%NaClFig12EISofdoublelayerscoatingsafterimmersedin315%NaClsolutionfordifferenttime213EIS33#315%NaCl3,,,107,,,,,4h8h,,,/1663:EIS3,,,,,3315%NaClFig13EISofsinglelayercoatingafterimmersedin315%NaClsolutionfordifferenttime331113,4,41#,,,,EIS,4(a),,,,/,4(b),,,,,,4(c),,,,,43Fig14Equivalentcircuitsofthreedifferentcoatingsindifferentimmersiontimes,4(d)2#,EIS4(c),,8h4(d)3#,4(b)4h312(RC),[10]3(13),51#2#3#3RCCCRC,,CC,,26659,,CC,[11]5,,3RC,CC,,[12],RC106cm2,3125105cm2,,,,,[12]2#1#3#1154109cm251923108cm23#72h11430104cm2,2#41880103cm2,1#72h41378106cm2,2#3#,300h1#51486104cm2,CCRCRCCC3:1#3#2#313fb,(breakpointfrequencymethod)[13214],,fb,fb,/,fb=K(At/Ao)fb,K=1/20,At,Ao,,,053RCCCFig15EvolutionofRCandCCasfunctionofimmersiontime,,K,[15],fb45,,,fb,,EISfbfb,,[12]3,fb(6)6,3,3,1#,fb,3663:EIS3,,3,2#fb3#,RC63Fig16Evolutionofbreakpointfrequencywithimmersiontimeforthreedifferentcoatings4(1)EIS3:,,,(2),,References[1]XieDeming(),HuJiming(),TongShaoping(),WangJianming(),ZhangJianqing().Influenceofzinccontentandsurfacecontaminationontheelectrochemicalbehaviorofepoxyzinc2richprimer1ActaMetallurgica(),2004,40(1):1032108[2]OliveiraCG,FerreiraMGS1Rankinghigh2qualitypaintsystemsusingEIS():Intactcoatings1Corros1Sci1,2003,45:1392147[3]BierwagenGP,HeL,LiJ1Studyofanewacceleratedevaluationmethodforcoatingcorrosionresistance2thermalcyclingtest1Prog1Org1Coat1,2000,39:67278[4]AmirudinA,ThierryD1Applicationofelectrochemicalimpedancespectroscopytostudythedegradationofpolymer2coatedmetals1ProgressofOrganicCoatings,1995,26:1228[5]MarcheboisH,KeddambM,SavallaC1Zinc2richpowdercoatingscharacterisationinartificialseawaterEISanalysisofthegalvanicaction1ElectrochimicaActa,2004,49:171921729[6]FedrizziL,RodriguezFJ,RossiS1Theuseofelectrochem2icaltechniquestostudythecorrosionbehaviouroforganiccoatingsonsteelpretreatedwithsolgelzirconiafilms1Electr2ochimicaActa,2001,46:371523724[7]MansfeldF1Useofelectrochemicalimpedancespectroscopyforthestudyofcorrosionprotectionbypolymercoatings1JournalofAppliedElectrochemical,1995,25(3):187[8]BonoraPL,DeflorianF,FedrizziL1Electrochemicalimpedancespectroscopyasatoolforinvestigatingunderpaintcorrosion1ElectrochimicaActa,1996,41:1073[9]HuJiming(),ZhangJianqing(),ZhangJintao(),CaoChunan().WateruptakerandfailureofepoxycoatingsonLY12aluminumalloyinNaClsolution1ActaMetallurgica(),2003,39(9):9552961[10]RammeltU,ReinhardG1Applicationofcorrosioninhibitorsinwater2bornecoatings1ProgressinOrganicCoatings,1992,21:205[11]MaoXiao(),ZhangJiuyuan(),XueJin(),DongShaoping(),XieShuihai().EISanalysisofendurablehighhichtemperaturecoatingforheatexchanger1EulletinofScienceandTechnology(),2005,21(1):19223[12]YangLihong(),LiuFuchun(),HanEnhou().Anti2corrosionperformancestudiesofthenano2ZnOpolyurethenecoatings1ChineseJournalofMaterialsResearch(),2006,20(4):3552361[13]ZhangJianqing(),CaoChunan().Studyandevaluationonorganiccoatingsbyelectrochemicalimpendencespectro2scopy1Corrosion&Protection(),1998,19(3):992104[14]WuLirong(),HuXuewen(),XuChongwu().Methodsforevaluationtheperformanceofprotectivecoatingsw