电偶腐蚀下非稳态扩散瞬时静电场分析  

Transient static electrical field analysis of non-steady-state diffusion under galvanic corrosion

作　　者：王向军[1] 张建春[1] 徐庆林 WANG Xiangjun;ZHANG Jianchun;XU Qinglin(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电气工程学院

出　　处：《国防科技大学学报》2019年第3期146-152,共7页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(41476153)

摘　　要：为分析在浓差极化条件下非稳态过程中的静电场分布情况,在斐克第二定律的基础上利用拉普拉斯变换求解电极表面氧浓度随时间的变化。通过法拉第定律分析受氧浓度控制下的电偶腐蚀电流密度,在此基础上利用电流元模型求解电解质溶液中任意位置处产生的瞬时电位及静电场强度,并通过实验验证结果的正确性。结果表明:浓差极化下的非稳态扩散传质产生的静电场及电位会随着时间的增加而逐渐减小,并最终达到稳态,且电流密度会随着氧的浓度减小而减小。In order to analyze the static electric field distribution of non-steady-state process under concentration polarization conditions,the Laplace transform was used to solve the change of oxygen concentration on the surface of the electrode based on the Fick second law. The current density of galvanic corrosion controlled by oxygen concentration was analyzed through Faraday law,in the basis of which the instant potential and static electric field in any position of electrolyte can be obtained through current element,and then to verify the correctness by experimental results. The results show that the static electric field and potential decrease with time and reach a steady state finally,while the current density decreases with the decrease of oxygen concentration.

关 键 词：浓差极化 非稳态 静电场 电偶腐蚀 拉普拉斯变换 法拉第定律 电流密度 

分 类 号：TN95[电子电信—信号与信息处理]