| 引用本文: | 杜娟,陈翘楚,刘青茂,魏子明,胡雪兰.铝合金在盐水环境中腐蚀性能的电化学研究[J].材料科学与工艺,2019,27(5):84-90.DOI:10.11951/j.issn.1005-0299.20180059. |
| DU Juan,CHEN Qiaochu,LIU Qingmao,WEI Ziming,HU Xuelan.Electrochemical study of aluminum alloys in brine environment[J].Materials Science and Technology,2019,27(5):84-90.DOI:10.11951/j.issn.1005-0299.20180059. |
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| 摘要: |
| 为了深入研究温度对铝合金材料的腐蚀行为和机理，采用盐水腐蚀方法研究了其在高温条件下的电化学特性及腐蚀机理.选用7A04和5A06铝合金作为研究对象，在质量分数为3.5%的氯化钠溶液中，利用增重法、蔡司显微镜并结合电化学测试方法研究了其在20~80 ℃范围内的腐蚀性能，分析了腐蚀产物的微观形貌，探讨了腐蚀机理.结果表明：两种铝合金试样的腐蚀速率均随温度升高而增大.在Tafel极化曲线图中，对于同一种铝合金，自腐蚀电位随腐蚀温度增加向负方向移动，自腐蚀电流密度和年腐蚀深度随腐蚀温度增加而减小.对同一腐蚀温度下的两种铝合金，5A06铝合金自腐蚀电位低于7A04铝合金，腐蚀电流密度和年腐蚀深度均小于7A04铝合金.电化学阻抗图谱中，两种铝合金在不同条件下的Nyquist图均存在一个容抗弧，极化电阻随腐蚀温度增加而减小.对于同一种铝合金，在3.5%氯化钠溶液中的腐蚀速率会随着温度的升高而增大；在同一腐蚀温度下，5A06铝合金比7A04铝合金更容易发生腐蚀，但腐蚀速率比7A04铝合金慢. |
| 关键词: 有色金属及其合金 腐蚀 电化学 极化曲线 阻抗谱 |
| DOI：10.11951/j.issn.1005-0299.20180059 |
| 分类号:TG146；TG178 .2 |
| 文献标识码:A |
| 基金项目: |
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| Electrochemical study of aluminum alloys in brine environment |
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DU Juan, CHEN Qiaochu, LIU Qingmao, WEI Ziming, HU Xuelan
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(Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300,China)
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| Abstract: |
| Due to the complexity of environment, aerospace aluminum alloys are highly susceptible to corrosion caused by environmental factors such as temperature and ocean atmosphere. Therefore, research on the high temperature corrosion behavior of aerospace aluminum alloys in salt water environment is essential. In order to improve corrosion resistance of aluminum alloy materials under high temperature, the corrosion performance under high temperature conditions was studied by salt water corrosion method. The corrosion behavior and corrosion mechanism of the 7A04 and 5A06 aluminum alloys in NaCl solution with a mass fraction of 3.5% within temperature ranging from 20~80 ℃ were investigated by weight test method, dynamic potential polarization curve measurement method, and electrochemical impedance spectrum measurement method. Results show that corrosion rates of two kinds of aluminum alloy specimens increased with the increase of temperature. Tafel polarization curves show that for both kinds of aluminum alloys, with the increase of corrosion temperature, self-corrosion potential moves to the negative direction, and corrosion current density and annual corrosion depth decrease simultaneously; at the same corrosion temperature, the self-corrosion potential of 5A06 aluminum alloy is lower than that of 7A04 aluminum alloy; meanwhile, the corrosion current density as well as the annual corrosion depth are less than those of 7A04 aluminum alloy. The Nyquist plots of two kinds of aluminum alloys at different corrosion temperatures were all composed of a capacitive arc, the polarization resistance decreased with the increase of corrosion temperature. |
| Key words: nonferrous metals and their alloys corrosion electrochemistry polarization curves impedance spectrum |
