摘要
基于大型仿真软件COMSOL Multiphysics,研究了25℃阴阳极面积变化时低碳钢/Mg合金AE44电偶对在3.5%NaCl溶液中的腐蚀行为,并在此基础上加入Al合金隔离器,研究Al合金面积的大小对低碳钢/Mg合金/引起电极极性逆转,且随着阴阳极面积比的增加Mg合金的腐蚀速率变快;当阴阳极面积比小于1∶1200时阳极的腐蚀速率将会达到最小极限值;面积比为1∶1∶1的低碳钢/Al合金/Mg合金复杂电偶对的最大电解质电流密度仅为面积比为1∶1的低碳钢/Mg合金电偶对最大电解质电流密度的40%左右;低碳钢/Al合金/Mg合金组成的复杂电偶对中,Mg合金AE44表面最大电流密度随Al合金的长度的增加而减小,且符合对数关系。
By using the large simulation software COMSOL Multiphysics,the corrosion behavior of mild steel/Mg alloy AE44 galvanic couple in3.5%NaCl solution at 25°C was studied.Based on the above study,Al alloy isolators were added to research the effect of the area of Al alloy on the corrosion of mild steel AE44 did not cause the polarity reversal of the electrode,and the corrosion rate of Mg alloy increased with the increase of the area ratios of anode and cathode.When the area ratio of anode and cathode was less than 1∶1200,the corrosion rate of the anode would reach the minimum limit value.Moreover,the maximum electrolyte current density of the mild steel/Mg alloy,the maximum current density of the surface of Mg alloy AE44 decreased as the length of Al alloy increased,which was corresponding to logarithmic relationship.
作者
丁清苗
秦永祥
崔艳雨
DING Qing-miao;QIN Yong-xiang;CUI Yan-yu(Airport College,Civil Aviation University of China,Tianjin 300300,China)
出处
《材料保护》
CAS
CSCD
北大核心
2020年第6期27-34,共8页
Materials Protection
基金
2019年天津市研究生科研创新项目(2019YJSS069)资助。
