以硫酸钴为主盐,酒石酸钠为配位剂,硼氢化钠为还原剂,采用改进的逐步滴加还原剂的方式控制反应进程,用化学镀法制备了Co-B合金包覆羰基铁颗粒的复合粉体.用正交设计方法确定了镀液组成和工艺参数:18 g/L CoSO4·7H2O,60 g/L酒石酸钠,1 g/L NaBH4,铁粉装载量2 g/L,温度75℃,pH值＞13,并进一步讨论了各因素对镀速的影响,对镀覆后的复合粉体的结构、成分进行了表征.结果表明,通过优化镀覆工艺,可以获得包覆均匀的复合粒子.
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