铝电解中阳极气泡形成的电化学研究

ELECTROCHEMICAL STUDY ON EVOLUTION OF ANODIC BUBBLE IN ALUMINIUM ELECTROLYSIS

用电化学方法研究了铝电解质熔液中石墨电极上的阳极过电压和阳极表面析出气泡的规律。阳极极化过电压满足Ｔａｆｅｌ方程，其常数ａ和ｂ分别为０．５３和０．１６。由于阳极气泡的析出，引起电极电位或电流的波动。在较低的电流密度和电极电位下，离开阳极表面的气泡质量相等；阳极气泡覆盖电极表面面积随电流和电位的升高而增大。

The anodic overvoltage and producing gas bubble law on the anodic surface were studied by electrochemical methods.The overvoltage has obeyed the Tafel equation, and constants of a and b are 0.53 and 0.16,respectively.The gas bubble evolution introduces the periodic fluctuation of potential or current.The gas bubble fled from the anodic surface involves equal mass at lower current densities or electrode potential and the area covered by the bubble increases with increasing current densities and electrode potentials.