| 电化学噪声表征7075铝合金的模拟大气腐蚀过程 |
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| 引用本文： | 刘晓磊,何建平,陈素晶. 电化学噪声表征7075铝合金的模拟大气腐蚀过程[J]. 腐蚀科学与防护技术, 2006, 18(5): 386-388 |
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| 作者姓名： | 刘晓磊 何建平 陈素晶 |
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| 作者单位： | 南京航空航天大学,材料科学与技术学院,南京,210016;南京航空航天大学,材料科学与技术学院,南京,210016;南京航空航天大学,材料科学与技术学院,南京,210016 |
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| 摘 要： | 用电化学噪声表征7075铝合金的模拟大气腐蚀过程，旨在探索电化学噪声方法在航空器腐蚀检测上的应用.用吸附3.5%NaCl电解液的镜头纸紧贴于试样表面以模拟大气腐蚀环境，测试了7075T6铝合金的腐蚀电流、电位随浸泡时间的波动.电化学噪声实验结果显示，腐蚀初期电流波动幅度较小，正负方向幅度相当.腐蚀2h后；电流波动表现为正向锯齿波，幅度增大到0.3 μA左右；6h后电流表现为幅度不等的负向波动.可以预测2 h后铝合金钝化膜的破坏是腐蚀的主要过程，6h后钝化膜的修复则占主导地位.
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| 关 键 词： | 铝合金 大气腐蚀 电化学噪声 |
| 文章编号： | 1002-6495（2006）05-0386-03 |
| 收稿时间： | 2005-09-07 |
| 修稿时间： | 2005-11-30 |
ELECTROCHEMICAL NOISE OF 7075 ALUMINUM ALLOY DURING A SIMULATED ATMOSPHERIC CORROSION PROCESS |
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| LIU Xiao-lei,HE Jian-ping,CHEN Su-jing. ELECTROCHEMICAL NOISE OF 7075 ALUMINUM ALLOY DURING A SIMULATED ATMOSPHERIC CORROSION PROCESS[J]. Corrosion Science and Protection Technology, 2006, 18(5): 386-388 |
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| Authors: | LIU Xiao-lei HE Jian-ping CHEN Su-jing |
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| Affiliation: | College of Material Science and Technology of Nanjing University of Aeronautics and Astronautics, Nanjing 210016 |
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| Abstract: | Lens tissue absorbing 3.5 % sodium chloride solution was clung on the surface of sample to simulate atmospheric corrosion. The corrosion current, potential fluctuations of 7075T6 aluminum alloys were measured. It has been observed that amplitude of current fluctuations was rather low in initial corrosion stages. Current fluctuations presented positive zigzag wave after 2 h corrosion, and current showed negative various fluctuations after 6 h. It was possible that breakdown of passive film was the main process after 2 h corrosion, whereas repair of the passive film was dominant after 6 h. |
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| Keywords: | aluminum alloy atmospheric corrosion electrochemical noise |
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