FeS阳极氧化电化学
来源期刊：中国有色金属学报2000年第3期
论文作者：徐洪辉 李新海 舒余德 蒋汉瀛
文章页码：430 - 432
关键词：FeS； 磁黄铁矿； 阳极氧化
Key words：FeS; pyrrhotite; anodic oxidization
摘 要：以高温合成法制备了FeS，用电位扫描、 旋转电极、恒电位电解等技术研究了FeS在电解液0.5 mol/L H2SO4+0.5mol/L K2SO4 (25℃， pH=0.70)中的阳极氧化过程。结果表明， FeS阳极氧化过程遵循“活性氧化—钝化—活性氧化”规律，在0.7～1.4 V (vs SCE)之间出现钝化区。第一个活性氧化区的Tafel方程为η=0.468+0.0289 lnJ， 在高过电位区， FeS阳极反应受固相扩散传质步骤控制，有少量高价态的S化合物生成。
Abstract: FeS was synthesized with Fe and S at high temperature. The electrochemical techniques, such as potential sweep, rotated disc electrode, and coulometry, were employed to probe the anodic oxidization behavior of FeS in the solution of 0.5 mol/L H2SO4+0.5 mol/L K2SO4 (0.25℃, pH=0.70). Experimental results demonstrated that the anodic oxidization behavior obeys the mode of activation oxidization—passivation—activation oxidization. Passivation occurs in the range of 0.7～1.4 V (vs SCE). The Tafel equation for the first activation oxidization zone isη=0.468+0.0289lnJ. Under the condition of higher overpotential, the anodic reactions are controlled by the step of the Fe solid diffusion. The products in anodic process are Fe3+ and S, and a small amount of sulfur compound with high valence is produced under higher over-potential.
