摘要
硫酸溶液中SUS304不锈钢旋转圆盘电极在正向电位扫描时产生电流振荡现象。振荡电流所对应的电位范围以及电流振荡幅度与溶液温度,硫酸浓度、电位扫描速度以及电极旋转速度存在着对应关系.在电位线性扫描条件下,溶液温度高于35.0℃、硫酸浓度大于2.5mol·L^(-1)以及电极旋转速度不大干1000rpm时,可观测到电流振荡现象。电流振荡现象的产生与电极溶解过程、Cr_2O_7^(2-)的生成。O_2的离析及MCr_2O_7盐膜的生成和裂解有着密切的关系。
Current oscillations were observed upon anodic polarization of SUS 304 steel rotating disk electrode in H2SO4 solutions. The potential region in which the current oscillations took place and the oscillation amplitude were found to be dependent on temperature, solution concentration, potential sweep rate, and electrode rotation rate. The current oscillation under linear potential sweep occurred when the temperature was higher than 35.0℃, concentration of H2SO4 was higher than 2.50mol/L and electrode rotation rate was slower than 1000 rpm. With increasing potential sweep rate, the potential range in which the current oscillation took place and oscillations amplitude were decreased. The occurrence of the current oscillations was rationalized in terms of a periodic sequence of dissolution and formation of the FeCr2O7 and NiCr2O7 films.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1998年第2期155-160,共6页
Journal of Chinese Society For Corrosion and Protection
关键词
电流振荡
不锈钢
旋转圆盘电极
硫酸溶液
Current oscillation, SUS 304 stainless steel, Rotating disk electrode, Sulfuric acid solution
