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Abstract In general, Tafel slopes are obtained from polarization curve in which polarization potential values are often greater than ±30mV. In the present paper, a coulostatic technique was applied to obtain Tafel slopes by analyzing ΔE(t)-T attenuation curve under eoulostatic perturbation. Due to the absence of current, this interrupt relaxation method was not affected by solution resistance and would be particularly suitable for the high resistivity medium and coationg systems. The new method was based on the electrochemical fundamental equations and was combined with coulostatie perturbation techniques, i.e. by arranging differential equation groups from Kirchhoff's Law and nodal current formula, then by solving them by fourth Runge-Kutta method. ΔE could be reduced within ±10mV. Some experimental systems have been used to demonstrate the proposed method.
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Received: 25 August 1992
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