钕铁硼磁体表面电沉积纳米氧化硅复合镀锌层的研究

目的增强钕铁硼材料的耐腐蚀性能。方法在钕铁硼磁体材料表面电沉积含有氧化硅、氧化钛纳米粒子的复合锌层。结果在氯化物镀锌溶液中加入10 g/L的氧化硅纳米粒子,可以获得氧化硅质量分数在3%以上的氧化硅纳米粒子复合镀锌层,而加入10 g/L的氧化钛纳米粒子的镀液所获得的复合镀层中,氧化钛的质量分数只有0.3%。结论中性盐雾腐蚀和盐水浸泡腐蚀试验结果表明,含有氧化硅纳米颗粒的复合镀锌层的耐腐蚀性能得到了提高,而含有氧化钛纳米颗粒的复合镀锌层的耐腐蚀性能则没有提高。含有纳米粒子的复合镀液经过1年的放置和间断使用,仍然保持着纳米颗粒均匀分散的稳定性和在镀层中稳定析出氧化硅纳米粒子的特征。

Electro-deposition of SiO2-Zn Composite Zinc Coating on NbFeB Magnet

The work aims to improve corrosion resistance of NdFeB magnets. Composite Zn coating containing SiO2 and TiO2 nanoparticles were electrodeposited on the surface of NdFeB magnets. Composite Zn coating with 3 wt% SiO2 nanoparticles were obtained by adding 10 g/L SiO2 nanoparticles in chloride zinc galvanizing solution solution, and only 0.3 wt% TiO2 nanoparticles were present in composite coating by adding 10 g/L TiO2 nanoparticles in plating solution. According to neutral salt-spray corrosion and saline soak corrosion tests, the corrosion resistance of SiO2-Zn composite coating is improved significantly while the TiO2-Zn composite coating is not. After being further preserved and continuously used for one year, the composite plating solution containing nanoparticles can still keep excellent homodisperse stability of nanoparticles and the characteristic of precipitating SiO2 nanoparticles in the coating.