過電位的影響
(中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 在實驗室制備各類AlF3摻雜試驗陽極， 在測試其基本物理化學(xué)性能的基礎(chǔ)上，采用“改進斷電流法”進行陽極過電位測試， 研究AlF3添加劑和陽極焙燒溫度對陽極過電位的影響。結(jié)果表明： 在一定條件下， 陽極中添加AlF3既可降低陽極的空氣/CO2反應(yīng)活性， 也可降低陽極過電位；受高溫脫S等因素的影響， 陽極的電化學(xué)活性及其空氣/CO2反應(yīng)活性并未隨著焙燒溫度的提高相應(yīng)降低。
關(guān)鍵字: 陽極過電位； AlF3； 添加劑； 焙燒溫度； 鋁電解
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
