电偶效应对与30CrMnSiA钢耦合的7B04铝合金当量折算系数的影响

发布时间：2018-07-06 16:12

本文选题：B铝合金 + CrMnSiA钢　；参考：《航空学报》2017年12期

【摘要】：借助动电位极化技术分别测得不同浓度NaCl溶液和水介质中7B04铝合金和30CrMnSiA钢的极化曲线。采用数值模拟与电化学实验相结合的方法,计算得到不同阴阳极面积比下、不同浓度NaCl溶液中7B04铝合金和30CrMnSiA钢的电偶电流。借助扫描电镜观察耦合前后7B04铝合金和30CrMnSiA钢试样腐蚀后的微观形貌。基于当量折算法的原理,以极化曲线作为边界条件建立数学模型,折算出多种阴阳极面积比下与30CrMnSiA钢耦合后的7B04铝合金在不同浓度NaCl溶液与水介质中的当量折算系数。结果表明,Cl-浓度和阴极面积的增加均会加剧电偶腐蚀,相较而言,阴阳极面积比的影响更为强烈。与30CrMnSiA钢耦合后,7B04铝合金加速腐蚀,在不同浓度NaCl溶液与水介质中的当量折算系数均出现不同程度的减小。
[Abstract]:The polarization curves of 7B04 aluminum alloy and 30CrMnSiA steel in different concentration NaCl solution and water medium were measured by potentiodynamic polarization technique. The coupling current of 7B04 aluminum alloy and 30CrMnSiA steel in different concentration NaCl solution was calculated by numerical simulation and electrochemical experiment. The microstructure of 7B04 aluminum alloy and 30CrMnSiA steel after corrosion was observed by SEM. Based on the principle of equivalent conversion method, a mathematical model was established using polarization curve as boundary condition, and the equivalent conversion coefficients of 7B04 aluminum alloy coupled with 30CrMnSiA steel in different concentration NaCl solution and water medium were calculated. The results show that the increase of Cl- concentration and cathode area will aggravate the galvanic corrosion. After coupling with 30CrMnSiA steel, the equivalent conversion coefficient of 7B04 aluminum alloy decreased in different concentration NaCl solution and water medium.
【作者单位】：海军航空工程学院青岛校区;
【基金】：国家自然科学基金(51377503)~~
【分类号】：TG172;V252.2

【相似文献】