引言用极化阻力法测定金属腐蚀电流都基于Stern-Geary公式:显然,极化阻力R_p的准确测量,是整个测定的关键所在。一般地说,R_p应由稳态极化数据得出。但是,由于电极界面电容充放电,每次极化后为获得稳态数据就需要一定的时间,视腐蚀体系的具体条件而异,这段时间有时是相当长的。在此期间,自然腐蚀电位本身可能发生漂移,从而造成误差。同时,外加极化电流长时间施加于腐蚀体系,也不是所希望的,它或多或少会干扰电极表面状态。因此,腐蚀速度的电化学测量中的 Introduction Polarization resistance method to determine the metal corrosion current are based on Stern-Geary formula: Obviously, the accurate measurement of polarization resistance R_p, is the key to the whole determination. In general, R_p should be derived from steady-state polarization data. However, as the electrode interface capacitance charges and discharges, it takes a certain amount of time after each polarization to obtain steady-state data, which is sometimes quite long depending on the specific conditions of the etching system. During this period, the natural corrosion potential itself may drift, resulting in errors. At the same time, it is undesirable for the applied polarization current to be applied to the etching system for a long time, which more or less can disturb the electrode surface condition. Therefore, the electrochemical measurement of corrosion rate