NdFeB 磁体表面致密化 Ni 镀层制备及其耐腐蚀性能

作者：Zhang Pengjie; Liu Qing; Sun Wei; Li Bingshan; Cao Yujie; Tang Dawei; Xu Guangqing^*; Wei Hanzhong; Xie Guanghuan; Wang Jiquan; Liu Hui; Wang Yongqi; Li Yafeng; Wang Qian

来源：Rare Metal Materials and Engineering, 2022, 51(8): 2863-2869.

• corrosion behavior
• densified-Ni coatings
• sintered NdFeB
• Vickers hardness

The densified-Ni coating on sintered NdFeB magnets was prepared by high-energy ball milling method. The film/substrate bonding strength and Vickers hardness of densified-Ni coating were tested. The corrosion resistance of the specimens was studied by neutral salt spray test and high temperature PCT test. The corrosion process of the magnets was further analyzed by static full immersion test. The results show that the Ni coating on the magnet surface could be densified by ball milling process. The microhardness of Ni-D24/NdFeB magnet increases from 4193.9 MPa to 4926.2 MPa and the binding strength increases from 16.30 MPa to 23.85 MPa after 400 r/min and 24 h ball milling, which indicates better mechanical damage resistance. The self-corrosion current density of the coating reduces by one order of magnitude compared with that of Ni/NdFeB magnet, and the resistance time to neutral salt spray increases from 312 h to 480 h, showing better corrosion resistance. ? 2022 Rare Metals Materials and Engineering Press.

• 单位
  合肥工业大学