| 铝合金阳极腐蚀过程的电化学阻抗谱研究 |
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| 引用本文： | 马景灵,文九巴,卢现稳,李元侦. 铝合金阳极腐蚀过程的电化学阻抗谱研究[J]. 腐蚀与防护, 2009, 30(6): 373-376 |
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| 作者姓名： | 马景灵 文九巴 卢现稳 李元侦 |
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| 作者单位： | 兰州理工大学材料科学与工程学院,兰州,730050;河南科技大学材料科学与工程学院,洛阳,471003;河南科技大学材料科学与工程学院,洛阳,471003 |
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| 摘 要： | 利用电化学阻抗谱(EIS)方法研究了Al-Zn-In-Mg-Ti合金阳极在3%NaCl溶液中的腐蚀过程,观察了260h浸泡腐蚀后的表面形貌.结果表明:合金腐蚀是点蚀引起的,腐蚀由钝化态开始,经点蚀诱导期,达到点蚀稳定期.分别采用不同等效电路拟合合金在不同腐蚀阶段的电化学阻抗谱.结果表明:当合金处于钝化态时,EIS谱为反应电阻Rt很大的容抗弧;随浸泡时间的延长,EIS谱低频出现感抗弧,合金进入点蚀诱导期,溶液电阻R5增大,反应电阻Rt减小,蚀孔内反应电阻R0减小,感抗L收缩;合金处于点蚀稳定期时,EIS谱低频感抗弧消失,出现一直线,腐蚀产物扩散成为反应控制步骤.
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| 关 键 词： | 铝合金 电化学阻抗谱 孔蚀 |
Electrochemical Impedance Spectroscopy of Aluminum Alloy Anode during Corrosion Process |
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| MA Jing-ling,,WEN Jiu-ba,LU Xian-wen,LI Yuan-zhen. Electrochemical Impedance Spectroscopy of Aluminum Alloy Anode during Corrosion Process[J]. Corrosion & Protection, 2009, 30(6): 373-376 |
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| Authors: | MA Jing-ling WEN Jiu-ba LU Xian-wen LI Yuan-zhen |
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| Affiliation: | 1.Lanzhou University of Technology;Lanzhou 730050;China;2.Henan University of Science and Technology;Luoyang 471003;China |
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| Abstract: | The corrosion process of Al-Zn-In-Mg-Ti alloy in 3% NaCl solution was investigated with electrochemical impedance spectroscopy(EIS).The EIS was simulated using the equivalent circuit model.The EIS and surface corrosion morphology of the alloy showed that the pitting corrosion induced the alloy corrosion.The corrosion initiated from the passive film,and then the pitting corrosion from the inducement stage came to the stable stage.There was a big capacitive art of the reaction resistance Rt at high frequency ... |
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| Keywords: | aluminium alloy EIS pitting corrosion |
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