基于COMSOL的多金属耦合腐蚀行为仿真  

Simulation of Multi-Metal Coupling Corrosion Behavior Based on COMSOL

作　　者：石鹏飞 段国庆 郭倩 杨文山[1] 卢云飞[1] SHI Pengfei;DUAN Guoqing;GUO Qian;YANG Wenshan;LU Yunfei(Wuhan Second Ship Design&Research Institute,Wuhan 430064,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430064

出　　处：《腐蚀与防护》2022年第9期59-66,共8页Corrosion & Protection

摘　　要：将多金属耦合体系拆分为多个双金属电偶,采用有限元仿真软件COMSOL,对比分析了各双金属电偶间耦合电流的大小,建立了基于中间电位金属的多金属耦合腐蚀模型阴、阳极状态的判断方法。以高强钢,B10铜镍合金和TA2钛合金三金属耦合体系为例,模拟研究了电极排序与阴/阳极面积比对多金属耦合体系腐蚀行为的影响。结果表明:在不同电极排序条件下,中间电位金属B10铜镍合金均作为阴极参与电偶腐蚀;当电极排序相同时,耦合体系中高强钢表面的电流密度随着B10与TA2面积占比的增加而增加;不同电极排序耦合体系中高强钢表面的电流密度按从大到小的顺序依次为B10铜镍合金-高强钢-TA2钛合金、高强钢-B10铜镍合金-TA2钛合金、B10铜镍合金-TA2钛合金-高强钢。Disassembling a multi-metal coupling system into multiple dual-metal galvanic couples,and using the finite element simulation software COMSOL to compare the magnitude of the coupling current between dual-metal galvanic couples,a method to judge the cathode and anode states of the multi-metal coupling corrosion model based on intermediate potential metal was established.Taking high strength steel,B10 copper nickel alloy and TA2 titanium alloy triple metal coupling system as an example,the effects of the comparison of electrode ordering and cathode/anode area ratio of the multi-metal coupling system were simulated.The results showed that under different electrode ordering conditions,the intermediate potential metal B10 copper nickel alloy was always used as a cathode to participate in galvanic corrosion.When the electrode ordering was the same,the current density on the surface of high strength steel of coupling system was increased with the increase of B10 and TA2 area ratio.The current density on surface of high strength steel of coupling system of different electrode ordering was B10 copper nickel alloy-high strength steel-TA2 titanium alloy,high strength steel-B10 copper nickel alloy-TA2 titanium alloy,B10 copper nickel alloy-TA2 titanium alloy-high-strong strength steel.

关 键 词：多金属耦合 COMSOL 高强钢 铜镍合金 钛合金 电偶腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]