The scaly SiO₂ coating was rapidly synthesized on the flake carbonyl iron powders by plasma electrolysis to solve the poor corrosion resistance. The effect of the processing numbers on the microstructure and corrosion resistance was systematically investigated. A fully covered and dense thin film was formed, excepted for the processing number of two and three times, where several typically smooth uncoated flake particles were observed. The corrosion test during immersion in NaCl solution for 60 days evidenced the greatly improved corrosion resistance with the one-time powders showed the best. The initial oxidation temperatures of the coated powders were increased by 50–85 °C with the one-time best, again revealing the effective protection of the film. The formation mechanism was also discussed mainly based on the electrochemical process and the plasma effects. We believe the plasma electrolysis will find a wide range of applications in the surface modification of metal powders.

鳞状SiO ₂通过等离子体电解在片状羰基铁粉上快速合成了涂层，解决了耐蚀性差的问题。系统地研究了加工数量对组织和耐蚀性的影响。形成了完全覆盖且致密的薄膜，不同之处在于处理次数为两次和三次，其中观察到几个通常光滑的未涂覆薄片状颗粒。在NaCl溶液中浸泡60天的腐蚀试验表明，一次性粉末显示出最佳的耐蚀性，大大提高了耐腐蚀性。涂层粉末的初始氧化温度提高了50-85°C，是最好的一次，再次显示了对膜的有效保护。还主要根据电化学过程和等离子体效应讨论了形成机理。