物理化学学报 >> 2005, Vol. 21 >> Issue (05): 544-549.doi: 10.3866/PKU.WHXB20050517

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多个时间常数线性体系恒电量响应的频谱分析

赵永韬; 王昱; 郭兴蓬; 李海洪   

  1. 华中科技大学化学系, 武汉   430074;    中船重工七二五所青岛分部, 海洋腐蚀与防护国家级重点实验室,  青岛   266071;    中国海洋大学电子系, 青岛   266071
  • 收稿日期:2004-12-10 修回日期:2005-01-21 发布日期:2005-05-15
  • 通讯作者: 赵永韬 E-mail:zhaoyt@sunrui.net

An Analysis Method for Coulostatically Induced Transients of Multi-time Constant Electrode Process in Frequency Domain

ZHAO Yong-Tao; WANG Yu; GUO Xing-Peng; LI Hai-Hong   

  1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan   430074;  State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute，Qingdao   266071；  Department of Electronics, Ocean University of China, Qingdao   266071
  • Received:2004-12-10 Revised:2005-01-21 Published:2005-05-15
  • Contact: ZHAO Yong-Tao E-mail:zhaoyt@sunrui.net

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摘要： 从线性条件出发，利用拉普拉斯变换及其逆运算推导多个时间常数体系在恒电量激励条件下线性响应暂态方程，并推导出恒电量激励下Rs(C1(R1(C2(R2(C3R3)))))电路模型的极化电位响应式. 通过线性响应方程的理论验证以及与实际腐蚀体系的EIS进行对比，结果表明：对恒电量瞬态响应进行频谱分析，可以促进恒电量测量结果与EIS进行更加细致的对比验证. 对含有多时间常数的电极过程，利用阻抗拟合软件进行局部拟合，可以确定初始值的设置，以避免时域的曲线拟合时出现多种结果的局面，大大地提高了恒电量瞬态响应数据解析的准确性.

关键词: 恒电量, 拉普拉斯变换, 参数解析, 时间常数

Abstract: The equation of transient response for the system with Rs(C1(R1(C2(R2(C3R3))))) equivalent circuit was presented, and some other transient response equations to a small amplitude coulostatic perturbation for multi-time constant electrode processes were also deduced. In the present work, impedance spectra were obtained by transforming coulostatic transient data in time domain into the frequency domain. Using this method, the number of time constant can be determined easily, and the kinetic parameters of the studied electrode process can be estimated correctly. The validity of the proposed method is demonstrated by calculation results based on equivalent circuit and one real corrosion system.

Key words: Coulostatic, Laplace transform, Parameter determination, Time constant