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用划破电极的方法研究了无膜不锈钢在氯化物溶液中的反应电流i与电位E的关系,logi与E成直线关系,其斜率达几百毫伏。这一现象在其它材料/环境体系中也存在。分析和推导表明欧姆降、扩散及新鲜金属裸露过程中形成氧化膜都不是电流随电位上升缓慢的主要原因。从阴离子吸附于新鲜表面减小反应活性区面积的角度可以推出具有几百毫伏斜率的表观塔菲尔关系,由此可以推测阴离子吸附对电极反应的影响是表观塔菲尔斜率过大的主要原因。
The relationship between the reaction current i and the potential E of the filmless stainless steel in chloride solution was studied by using the electrode piercing method. The logi is linear with E, and the slope is several hundred millivolts. This phenomenon also exists in other material / environment systems. Analysis and derivation shows that the formation of oxide film during ohmic drop, diffusion and fresh metal exposure are not the main reasons for the current to rise slowly with the increase of potential. An apparent Tafel relationship with a slope of several hundred millivolts can be derived from the perspective of anion adsorption on a fresh surface to reduce the area of the reactive zone, from which it can be inferred that the effect of anion adsorption on the electrode reaction is that the apparent Tafel slope is too large The main reason.