陰離子的電遷移及其對不銹鋼局部腐蝕閉塞區(qū)的作用機制研究.pdf

1、北京化工大學(xué)碩士學(xué)位論文陰離子的電遷移及其對不銹鋼局部腐蝕閉塞區(qū)的作用機制研究姓名：吳小梅申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：許淳淳2001.5.18北京化工大學(xué)碩士學(xué)位論文ABSTRACTSimulatedOccludedCorrosionCelI(OCC)，Electrochemicalmeasurements(potentiodynamicpolarizationcurves)andXPSwereusedtostudythec

2、hangesofchemicalandelectrochemicalstatewithintheOCCofAISl304stainlesssteelinneutralsolutionof05molLlNaCIcontainingvariousanions(M0042’、W042C12H25S04。和c12H25C6H4S03’)at50。CItwasfoundthat：whentherewerenoaddedanionsinthebul

3、ksolution，asanodiccurrentpassingthecell，thepHvaluedroppedquicklyatbeginningwhileslowlyafteritreachedabout3pH2364—0792219Q。MeanwhiletheC1。migratedintotheOCC，themigrationwasproportionaltothequantityofpassingelectricity，eac

4、hmolCI’migratedalmostalways15FelectricitypassedTheE∞ⅡshiftedtowardnegativeandtheI∞nincreasedgraduallyWhenanions(M0042。、W042。、C12H25504和C12H25C6IhS03‘)addedintothebulksolutionrespectivelytheyallmigratedintotheOCC，andthemi

5、gratedquantityisdifferentTheanionswereincompetitionwithC1。onmigration，theyhaddifferenteffectontheCI‘migration，pHfall，Eco，『andIⅫTheyCallretardthemigrationofCl‘effectivelywhentheanionsexceedingacertainconcentration，Thehi【g

6、hertheconcentration，themoreefficientitwasThemigrationquantityincreasedwiththeconcentrationandthetime，themigrationratedecreasedwiththetimeTheyretardedtheinductionandprogationofthelocalcorrosionofstainlesssteelinthesolutio