酸洗和磷化对钕铁硼磁体表面涂层性能的影响

Effects of pickling and phosphating on properties of coatings sprayed on neodymium–iron–boron magnet surface

通过铜加速酸性盐雾(CASS)试验、高压加速老化(PCT)试验、冷热冲击试验以及划格试验,对比了酸洗和酸洗+磷化预处理钕铁硼磁体对其表面纳米涂层耐蚀性、抗老化性、抗冷热冲击性和结合力的影响,以期在钕铁硼防腐涂装生产中开发出更高效、环保的工艺。结果表明,两种基材表面涂层的耐冷热冲击性和结合力相当,但酸洗基材表面涂层的耐蚀性和抗老化性都优于酸洗+磷化基材表面涂层。

In order to develop an environment-friendly and highly efficient anticorrosive coating process for neodymium–iron–boron magnet,the effect of pretreatment(i.e.pickling only or pickling prior to phosphating)of neodymium–iron–boron magnet on the adhesion of nano-coating sprayed to it and the corrosion of nano-coating to corrosion,aging,and thermal shock was compared by copper-accelerated acid salt spray(CASS)test,pressure cooker test(PCT),thermal shock test,and cross-cut test.The results showed that the coating sprayed on the substrate pretreated with different processes had equivalent thermal shock resistance and adhesion,while the coating sprayed on the substrate pickled only showed better resistance to corrosion and aging than that sprayed on the substrate pretreated by combination of pickling and phosphating.