阴极保护数值模拟计算中阳极边界条件选取研究  

Selection of Boundary Conditions of Anodes in Numerical Simulation of Cathodic Protection System

作　　者：蒋卡克[1] 杜艳霞[1] 路民旭[1] 董亮[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《腐蚀科学与防护技术》2013年第4期287-292,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(51101015);中央高校基本科研业务费专项资金(FRF-TP-12-145A)资助

摘　　要：利用BEASY边界元数值计算软件对比分析了牺牲阳极与外加电流阴极保护系统中采用不同的阳极边界对计算结果的影响。结果表明,牺牲阳极阴极保护系统中,采用开路电位作为阳极恒电位边界与阳极极化曲线边界相比误差在1%以内;外加电流阴极保护系统中辅助阳极采用恒电流密度边界与阳极极化曲线边界相比误差小于0.1%,在工程应用中,为了便于计算,可采用开路电位作为牺牲阳极的边界条件,采用恒电流密度作为辅助阳极的边界条件。The accuracy of numerical calculation used to simulate a cathodic protection（CP） system was significantly influenced by the required boundary conditions of cathode and anode.At present,the effect of boundary conditions of cathode has been given more attention,while the effect of boundary conditions of anode is seldomly referred.The boundary conditions of anode in numerical simulation can be classified as constant current density,constant potential and real polarization curve.Errors caused by different boundary conditions of anode have not been reported and compared that gave rise to certain difficulties in numerical simulation.The effect of different boundary conditions of anode on numerical simulation in sacrificial anode cathodic protection（SACP） system and impressed current cathodic protection（ICCP） system has been studied with BEASY software based on boundary element method in this paper.The results showed that error between boundary conditions of sacrificial anode of constant open circuit potential and real polarization curve was not more than 1% in SACP system,and error between boundary conditions of auxiliary anode of constant current density and real polarization curve was less than 0.1% in ICCP system,which indicated that open circuit potential and constant current density could be selected as the boundary conditions of sacrificial anode and auxiliary anode respectively for the convenience of calculation in engineering applications.

关 键 词：阳极边界条件 数值模拟 恒电流密度 恒电位 

分 类 号：TG174.41[金属学及工艺—金属表面处理]