工業(yè)純鈦在海水中陰極極化條件下的氫脆研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文工業(yè)純鈦在海水中陰極極化條件下的氫脆研究姓名：郭敏申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電化學(xué)工程指導(dǎo)教師：彭喬2001.3.1查壟里三u犬堂墮主笙奎—竺竺竺LAbstractGeneralcorrosionbehaviorsoftitaniuminseawaterandeffectsoftemperature，surfaceroughnessofthesamplesoncathodichydrogenevolutionhav

2、ebeenstudiedbydynamicpolarization，transient】inearpolarization，weakpolarizationandcoulostaticmethodTheresultsshowthattheantigeneralcorrosionpropertjI，oftitaniuminseawateriSexcellentanditscorrosioniScontrolledbythesurfaceo

3、xidefilmwhichcausestoitslOWcorrosionrateofavaluelessthan10。mm／aHydrogenevolutionontitaniumiSretardedTemperaturehaslittleeffectonthecorrosionpotentialbutwithitrisingandsurfaceroughnessincreasing，hydrogenevolutionbecomesmo

4、reeasilyHydrogenationoftitaniumhasbeenstudiedundercathodicpolarizationwithelectrochemicaltesttechnique，X—raydiffraction，SEMandsingletensionexperimentItisdisplayedthathydrogeningressweakensthestabilityofsurfacepassivefilm

5、anditsanodicdissolutioncurrentdensityincreasesCathodicpolarizationmaycausehydridefo訂nationontitaniuminseaWaterandthegrowthofthehydridelayerOCCURSbythediffusionofhydrogenatomsthroughthelayertothehydride—metalinterfaceWith

6、timeofcharging，theconcentrationofTiH2onthesurfaceincreases、insteadthediflusionofhydrogenbecomesmoredifficultlyTheconcentrationgradofactiveatomichydrogenonthesurfaceoftitaniumandpotentialgradaredrivingforcetothehydrogendi

7、ffusionAvalueof6810“1cm。／shasbeenobtainedforthediflusioncoefficientofhydrogenintitaniumatroomtemperatureTiH。cannotbefoundonthesurfacechargingat1500mVfortwodaysandthetensilestrengthandyieldstrengthhave】inlechangeButtherea

8、remorecleavageplanesandcleavagestepsCathodicpolarizationwillresultinhydrogenembrittlementSusceptibilityKeywords：titaniumseawatercorrosioncathodicpolarizationhydrogenevolutiondiffusiontitaniumhydridehydrogenembrittlementH