北京科技大学学报2013，Vol.35Issue(5)：634-641,8.
AZ31镁合金微区电偶腐蚀的数值研究
Numerical study on the micro-galvanic corrosion of AZ31 magnesium alloy
摘要
Abstract
In combination with a moving mesh technique and a level set function,the corrosion behavior of AZ31 magnesium alloy with a continuous β phase network and the discrete β phase around the α phase in a sodium chloride solution was investigated by finite element method.The distributions of potential and the concentrations of chloride ions and magnesium ions on the interface of magnesium/chloride solution during the corrosion progress were obtained by solving the Nernst-Planck function.The feasibility of this simulation method was validated with scanning ion-selective electrode experiments.Simulation results show that when the β phase is a discrete distribution around the α phase,the corrosion rate of the α phase adjacent to the β phase is the highest,a indented corrosion pit form at this place and chloride ions are enriched,which leads to the acceleration of the corrosion rate of the α phase.Finally,the β phase is removed from the alloy into the solution.However,when the β phase is a continuous distribution around the α phase,the solving process tends to be halted after the α phase is totally dissolved and only the continuous β phase is exposed to the chloride solution.Results of scanning ion-selective electrode experiments indicate that this simulation method can predict the electrochemical corrosion of magnesium alloys well.关键词
镁合金/腐蚀/数值分析/计算机模拟/扫描离子选择性电极技术Key words
magnesium alloys/ corrosion/ numerical analysis/ computer simulation/ scanning ion-selective electrode technique分类
矿业与冶金引用本文复制引用
高福勇,赵明,何广平,方克明..AZ31镁合金微区电偶腐蚀的数值研究[J].北京科技大学学报,2013,35(5):634-641,8.基金项目
国家自然科学基金资助项目(51271003) （51271003）
北京市人才强教深化骨干教师计划资助项目(PHR201008201) （PHR201008201）
