研究了碳钢电极在硫酸溶液中的钝化和电流振荡行为。发生振荡的电位范围仅在钝化电位附近。振荡电流反映了电极活化、钝化过程的交替变化,其大小、周期和峰宽都随着溶液 H_-~+离子浓度改变而变化。振荡电流的形状亦与 H_-~+离子浓度有关。振荡原因是钝化膜的结构和组成的不均匀,它反复地生成和溶解,使电极表面交替钝化和活化,致使电流振荡。 The passivation and current oscillation of carbon steel electrode in sulfuric acid solution were studied. The potential range where oscillation occurs is only near the passivation potential. The oscillating current reflects the alternation of the activation and passivation of the electrode. The size, period and peak width of the electrode vary with the concentration of H_ ~ + ions. The shape of the oscillating current is also related to the H_ ~ ~ + ion concentration. Oscillation is due to the passive film structure and composition of non-uniform, it repeatedly generated and dissolved, so that the electrode surface alternately passivation and activation, resulting in current oscillation.