316L不銹鋼亞穩(wěn)態(tài)孔蝕行為的電化學(xué)特征.pdf

1、北京化工大學(xué)碩士學(xué)位論文316L不銹鋼亞穩(wěn)態(tài)孔蝕行為的電化學(xué)特征姓名：肖娟申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：左禹2001.5.13北京化工大學(xué)碩士論文THEELECTROCHEMlCALCHARACTERSOFMETASTABLEPlTTINGOF316LSTAINLESSSTEELABSTRACTPotentiostaticandpotentiodynamicpolarizationmethodswereemployedtost

2、udythebehaviorofmetastablepittingon316LstainlesssteelinNaClsolutionsThedistributionofE。(thepotentialatwhichthefirstmetastablepitemerged)andEb(thepotentialatwhichthestablepitemerged)andtherelationshipbetweenthemwerestudie

3、dbypotentiodynamicmethodTheinfluencesofsomefactors，suchastheconcentrationofCI’ions，potentialandpHvalue，oncharacteristicparametersofmetastablepittingwerealsostudiedbybothmethodsInaddition，extremevaluedistributionofpeakcur

4、rentsandtherelationshipbetweengrowlhvelocityKandpeakcurrentImwerestudiedBothEmandEbobeyednormaldistributionWiththeincreaseoftheconcentrationofCI’ions，bothE。andEbreducedwithlgCN。cIinawayoflinearityBecausetheconcentrationo

5、fCI。ionshadalittleeffecton(E。一Eb)value，wecouldgettheEbvaluebymeasuringE。valueGenerall)’speaking，withtheincreasesofconcentrationofCI‘ionsandpotential，thenumberofmetastablepitnucleationN，growxhvelocityKandpeakcurrentI。hada

6、tendencytoincease，andthelifetimeofmetastablepitshadatendencytodecreaseTheresultshadsomedifferenceinpotentiostaticandpotentiodynamicpolarizationmethodsPHvalue，howeverhadalittleeffectonthemetastablepittingparametersWhenthe