Electrochemical Noise Characteristics of Corrosion Behavior of Al-based Hydrotalcite Coatings
摘 要
采用电化学噪声技术监测了铝基水滑石涂层在3.5% NaCl溶液中的腐蚀行为。通过电化学噪声的时域谱分析、时域统计参数分析、频域分析以及形貌特征分析, 对电极的腐蚀过程进行了研究。结果表明, 涂层的点蚀发展过程可以分为4个阶段: 钝态期, 噪声波动较小, 各参数比较平稳; 亚稳态点蚀核形成期, 噪声出现波动, σV、σI、W、k、fc增大, Rn减小; 稳态点蚀发展期, 电位噪声出现快速下降缓慢上升的典型特征, 各参数趋于极值, Li(局部化噪声指数)接近于1; 点蚀发展后期, 噪声波动减弱, 各参数值也趋于减弱。
Abstract
The corrosion behavior of Al-based hydrotalcite coatings in 3.5% NaCl solution was characterized by electrochemical noise analysis technique. The corrosion process of electrodes was studied in detail by analyzing time-domain and frequency-domain characteristics of electrochemical noise (EN) together with morphology features. The results showed that the pitting corrosion process of coatings could be divided into four different stages. At passivated stage, the EN fluctuated slightly, and the parameters were relatively stable. At metastable pitting nucleation stage, the EN began to fluctuate obviously, σV, σI, W and fc increased, Rn decreased. At stable pitting corrosion stage, the potential declined rapidly and rised slowly, meanwhile various parameters tended to extremum and Li (localization index) was close to 1. At later pitting corrosion stage, the EN fluctuated slightly and various parameters tended to be weakened.
中图分类号 TG174.3
所属栏目 试验研究
基金项目 海洋重大专项子课题(201005028-3); 中央高校基本科研业务费专项资金(1000-852012)
收稿日期 2013/3/26
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引用该论文: LIU Shi-qiang,WANG Li-da,ZONG Qiu-feng,ZHANG Kai-yue,ZHANG Cheng,LIU Gui-chang. Electrochemical Noise Characteristics of Corrosion Behavior of Al-based Hydrotalcite Coatings[J]. Corrosion & Protection, 2014, 35(1): 1
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参考文献
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【7】贾志军,杜翠薇,李晓刚. 316L不锈钢在FeCl3溶液中点蚀行为的电化学噪声检测[J]. 腐蚀与防护,2011,32(7):497-500.
【8】赵茹,宋诗哲,张正. 敏化态304不锈钢慢速率拉伸腐蚀过程的电化学噪声检测[J]. 腐蚀与防护,2012,33(1):16-19.
【9】张焱冰,王源升,孔小东,等. 碳钢在淡水条件下点蚀的电化学噪声研究[J]. 腐蚀与防护,2010,31(5):372-375.
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【12】PUGET Y,TRETHEWEY K,WOOD R J K. Electrochemical noise analysis of polyurethane-coated steel subjected to erosion-corrosion[J]. Wear,1999,233-235:552-567.
【13】ZHANG Z,ZHANG J Q. Features of electrochemical noise during pitting corrosion of 2024-T3 aluminum alloy in 3.0% Na2SO4 solution[J]. The Chinese Journal of Nonferrous Metals,2001,11(2):284-287.
【14】李季,赵林,李博文. 304不锈钢点蚀的电化学噪声特征[J]. 中国腐蚀与防护学报,2012,32(3):235-240.
【15】董泽华,郭兴蓬. 16Mn钢局部腐蚀中的电化学噪声特征[J]. 中国腐蚀与防护学报,2002,22(5):290-294.
【16】张鉴清,曹楚南. 电化学测试技术[M]. 北京:化学工业出版社,2010.
【17】程英亮,曹发和,张昭,等. NaCI溶液中LC4,LY12及纯铝腐蚀过程的电化学噪声特征[J]. 金属学报,2002,38(1):74-78.
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