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Citation: ZHAO Yong-Tao, WANG Yu, GUO Xing-Peng, LI Hai-Hong. An Analysis Method for Coulostatically Induced Transients of Multi-time Constant Electrode Process in Frequency Domain[J]. Acta Physico-Chimica Sinica, ;2005, 21(05): 544-549. doi: 10.3866/PKU.WHXB20050517 shu

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

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 Date: 10 December 2004
Available Online: 15 May 2005

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.
- Coulostatic; Laplace transform; Parameter determination; Time constant
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