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首页> 外文期刊>Corrosion Engineering, Science and Technology >Corrosion behaviour and catalytic effectiveness of Pb-Ca-Sn, RuO_2-IrO_2/Ti and IrO_2-Ta_2O_5/Ti anodes for copper electrowinning
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Corrosion behaviour and catalytic effectiveness of Pb-Ca-Sn, RuO_2-IrO_2/Ti and IrO_2-Ta_2O_5/Ti anodes for copper electrowinning

机译：Pb-Ca-Sn，RuO_2-IrO_2 / Ti和IrO_2-Ta_2O_5 / Ti阳极对铜电解沉积的腐蚀行为和催化效率

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摘要

The dependence of the corrosion rate on cell current density (CD) for three anode materials (Pb-Ca-Sn, RuO_2-IrO_2/Ti and IrO_2-Ta_2O_5/Ti) in a laboratory scale copper electrowinning cell has been studied by means of short term weight loss tests, scanning electron microscopy observations and energy dispersive spectroscopy analysis. The lead anodes (Pb-Ca-Sn) corroded at all the studied cell CDs, and their corrosion rate increased with increasing cell CD. The precious metal oxide anodes (RuO_2-IrO_2 and IrO_2-Ta_2O_5) only exhibited corrosion at the highest tested cell CD (1000 A m~(-2)), and their corrosion rates were about a quarter of the lead corrosion rate at the same cell CD. The electrocatalytic properties of the three anode materials were characterised by means of potentiodynamic experiments. The overall results pointed to IrO_2-Ta_2O_5/Ti as the best anode material of choice, although plant tests would be required before deciding on any specific commercial use.
机译：通过短时间的研究，研究了三种电解材料（Pb-Ca-Sn，RuO_2-IrO_2 / Ti和IrO_2-Ta_2O_5 / Ti）的腐蚀速率对电池电流密度（CD）的依赖性。长期减肥测试，扫描电子显微镜观察和能量色散光谱分析。铅阳极（Pb-Ca-Sn）在所有研究的电池CD上均受到腐蚀，并且其腐蚀速率随电池CD的增加而增加。贵金属氧化物阳极（RuO_2-IrO_2和IrO_2-Ta_2O_5）仅在测试的最高电池CD（1000 A m〜（-2））上表现出腐蚀，并且在相同的腐蚀速率下，其腐蚀速率约为铅腐蚀速率的四分之一。细胞CD。通过电位动力学实验表征了三种阳极材料的电催化性能。总体结果表明IrO_2-Ta_2O_5 / Ti是最佳的阳极材料选择，尽管在决定任何特定的商业用途之前还需要进行工厂测试。

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