电偶效应对与30CrMnSiA钢耦合的7B04铝合金当量折算系数的影响

doi:10.7527/S1000-6893.2017.421358

材料工程与机械制造

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电偶效应对与30CrMnSiA钢耦合的7B04铝合金当量折算系数的影响

陈跃良, 赵红君, 卞贵学, 张勇

海军航空工程学院青岛校区, 青岛 266041

收稿日期:2017-04-25 修回日期:2017-09-01 出版日期:2017-12-15 发布日期:2017-08-31
通讯作者: 陈跃良 E-mail:cyl0532@sina.com
基金资助:
国家自然科学基金（51377503）

Influence of galvanic action on equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel

CHEN Yueliang, ZHAO Hongjun, BIAN Guixue, ZHANG Yong

Qingdao Extension, Naval Aeronautical Engineering Institute, Qingdao 266041, China

Received:2017-04-25 Revised:2017-09-01 Online:2017-12-15 Published:2017-08-31
Supported by:
National Natural Science Foundation of China (51377503)

摘要/Abstract

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。

关键词: 7B04铝合金, 30CrMnSiA钢, 电偶腐蚀, 电化学性能, 数值模拟, 当量折算系数

Abstract: The potentiodynamic polarization technique was used to measure the polarization curves of 7B04 aluminum alloy and 30CrMnSiA steel in different concentration of NaCl solution and aqueous media. The galvanic current of 7B04 aluminum alloy contacted with 30CrMnSiA steel in NaCl solution with different concentrations and different area ratios were calculated by numerical simulation and electrochemical experiment. Micromorphology of 7B04 aluminum alloy coupled with 30CrMnSiA steel or not after corrosion was observed by Scanning Electron Microscopy (SEM). Based on the equivalent conversion coefficient method, while the mathematical model was established by using the polarization curve as the boundary condition, the equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel in NaCl solution with different concentrations, aqueous media, and different area ratios of cathode to anode were investigated. Results show that the increase of Cl^- concentration and cathode area can aggravate galvanic corrosion, and the ratio of anode to cathode area was more intense comparatively. Furthermore, the 7B04 aluminum alloy after being coupled with 30CrMnSiA steel accelerated corrosion, and the equivalent conversion coefficient of 7B04 aluminum alloy in NaCl solution with different concentrations and aqueous media tended to decrease to different degrees.

Key words: 7B04 aluminum alloy, 30CrMnSiA steel, galvanic action, electrochemical properties, numerical simulation, equivalent conversion coefficient

中图分类号:

TG172.2
V252

陈跃良, 赵红君, 卞贵学, 张勇. 电偶效应对与30CrMnSiA钢耦合的7B04铝合金当量折算系数的影响[J]. 航空学报, 2017, 38(12): 421358-421358.

CHEN Yueliang, ZHAO Hongjun, BIAN Guixue, ZHANG Yong. Influence of galvanic action on equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(12): 421358-421358.

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电偶效应对与30CrMnSiA钢耦合的7B04铝合金当量折算系数的影响

Influence of galvanic action on equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel

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