本工作采用恒电量技术,分析恒电量微扰下的△E～t衰减曲线以获得塔菲尔斜率。这种断电的松弛方法不受溶液电阻的影响,因而特别适用于高阻介质和涂装金属体系。该方法以电化学基本方程为基础,结合恒电量微扰技术原理。使用基尔霍夫和结点电流公式列出微分方程组,然后采用四阶龙格——库塔法解微分方程组。可将△E值缩小到±10mV的范围。对几个实验体系所进行的试验验证了本方法的可行性。
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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