Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (05): 544-549.doi: 10.3866/PKU.WHXB20050517

• ARTICLE • Previous Articles     Next Articles

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

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