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通过监测镀液吸光度和Sn2+含量随甲磺酸(MSA)高速镀锡液中铁离子(Fe2+和Fe3+)含量的变化,分析了镀液中Sn2+氧化水解速率与铁离子的关系.结果表明,在简单盐溶液体系中,Sn2+先氧化生成Sn4+,再水解生成偏锡酸沉淀.Fe3+氧化Sn2+而生成的锡泥是影响镀液浊度的主要因素.Fe2+含量为5~15 g/L时,Fe2+对Sn2+的氧化有稳定的减缓作用;Fe2+含量为10g/L时对Sn2+氧化水解的减缓作用最强.鼓气加速Sn2+氧化水解的试验表明,Fe2+含量为10g/L的镀液中Sn2+质量浓度与鼓气时间呈线性关系.

参考文献

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