过电位的影响
(中南大学 冶金科学与工程学院， 长沙 410083)
摘 要: 在实验室制备各类AlF3掺杂试验阳极， 在测试其基本物理化学性能的基础上，采用“改进断电流法”进行阳极过电位测试， 研究AlF3添加剂和阳极焙烧温度对阳极过电位的影响。结果表明： 在一定条件下， 阳极中添加AlF3既可降低阳极的空气/CO2反应活性， 也可降低阳极过电位；受高温脱S等因素的影响， 阳极的电化学活性及其空气/CO2反应活性并未随着焙烧温度的提高相应降低。
关键字: 阳极过电位； AlF3； 添加剂； 焙烧温度； 铝电解
of carbon anode in aluminium electrolysis
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The anode samples doped with different content of AlF3 were prepared. Based on their physical and chemical properties test and anodic overpotential measure by so called modified current interruption technique, the effects of AlF3 dopant and baking temperature on the overpotential of carbon anode were studied. The results show that, the overpotential of carbon anodes as well as their air/CO2 reactivity can be decreased by doping with certain content of AlF3; resulting from some factors such as the elimination of S at high temperature, the decreases of anodic overpotential and air/CO2 reactivity with temperature increase have not been found as previous reported.
Key words: anodic overpotential; AlF3; dopant; baking temperature; aluminum electr
