漏电导致阴极保护绝缘接头内腐蚀失效的有限元分析

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Vol.22No.5

CORROSIONSCIENCEANDPROTECTIONTECHNOLOGY

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102249

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:TB115

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:1002–6495(2010)05–0452–03

FEMAnalysisofInnerCorrosionFailureInducedbyCurrent

LeakageforCathodeProtectionInsulatingJoint

CHENLi-qiang,DONGHai-tao,CHENChang-feng,ZHENGShu-qi

DepartmentofMaterialsScienceandEngineering,ChinaUniversityofPetroleum,Beijing102249Abstract:Numericalsimulationofthemagnitudeanddistributionoftheleakagecurrentdensityby niteelementanalysis(FEM)wasusedtoanalyzeinternalcorrosionfailureinducedbycurrentleakageforcathodeprotectioninsulatingjoint.E ectsofthepotentialdi erenceonbothsidesofinsulatingjoint,transmissionmediumresistivityandinnercoatdefectsofinsulatingjointonthemagnitudeanddistributionoftheleakagecurrentdensitywerediscussed.TheFEMresultsagreedwellwiththeinsulatingjointcorrosionphenomenaintheoil eldworkingplace.

Keywords:cathodeprotection;insulatingjoint;currentleakage;corrosionfailure;coatdefect;

niteelementmethod

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U= 2U 2U 2U

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Tel010-89733200

E–mail:liqiang(1)

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