用旋转环-盘电极研究了A_3钢在浓碱溶液中的动电位行为及电化学溶解特性。在环电极上收集了A_3钢盘电极在动电位扫描及恒流极化过程中所生成的可溶性Fe(Ⅱ)与Fe(Ⅲ)粒子,测定了溶解电流与总氧化或还原电流的比例,发现当碱液浓度及温度提高时可溶性粒子的收集电流显著增加。 对铁在碱性溶液中的电化学腐蚀过程进行了讨论。
The ring-disk electrode has been used to study the potentiodynamic behaviour and electrochemical dissolution of A_3 steel in concentrated alkaline solution.The soluble Fe (Ⅱ) and Fe (Ⅲ) species were collected on the ring electrode when sweep measurement or galvanostatic polarization were made on A_3 steel disk electrode.The proportion of the collected current to the total current of oxidation or reduction has been measured.It was found that the collected current of soluble species was increased significantly with increasing temperature and KOH concentration. The electrochemical corrosion process of iron in concentrated alkaline solution was discussed.
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