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讨论了应用极化曲线、极化电阻和交流阻抗等电化学测量技术来测定吸附型缓蚀剂的缓蚀效率和研究缓蚀剂作用机理时,在实验数据的解释方面可能遇到的问题。只有在缓蚀剂的缓蚀作用来处“覆盖效应”对,缓蚀效率才等于缓蚀剂吸附的面积分数。覆盖效应的主要特征是腐蚀电位不因缓蚀剂的存在而有明显的移动,并且在添加缓蚀剂的溶液中,腐蚀电位下的阻抗平面图是一个简单的容抗弧。在许多精况下缓蚀剂的吸附面积分数是电位的函数。在这情况下用塔菲尔直线外推法和极化电阻法估算腐蚀速度或缓蚀效率往往失真。讨论还表明,交流阻抗测量是一种十分有用的研究缓蚀剂作用机理的方法。
The problems that may be encountered in the interpretation of experimental data when using electrochemical measurements such as polarization curves, polarization resistance and alternating current impedance to determine the corrosion inhibition efficiency of adsorption inhibitors and the mechanism of action of corrosion inhibitors are discussed. Only in the corrosion inhibitor corrosion effect at the “cover effect” on the corrosion inhibition efficiency is equal to the area fraction of corrosion inhibitor adsorption. The main feature of the covering effect is that the corrosion potential does not significantly shift due to the presence of corrosion inhibitor. In addition, the corrosion resistance is a simple capacitive arc in the corrosion inhibitor solution. The corrosion area fraction of the corrosion inhibitor is a function of the potential in many cases. In this case, it is often distorted to estimate the corrosion rate or the corrosion inhibition efficiency using the Tafelline extrapolation method and the polarization resistance method. The discussion also shows that AC impedance measurement is a very useful method of studying the mechanism of corrosion inhibitors.