Investigation of Ultrasonic Electroplating Ni-P Coatings on Nd-Fe-B Permanent Magnet
In order to improve the corrosion resistance of Nd-Fe-B, the new technological process is done which involves electroplating Ni–P alloys with ultrasonic. The influence of ultrasonic on electroplating Ni–P alloy on Nd-Fe-B was studied by using microscope, adhesion test and NaCl solution immersion test. The results showed that the Ni–P alloy deposit on Nd-Fe-B is rough and has poor adhesion without ultrasonic agitation; however, the Ni–P alloy deposit on Nd-Fe-B with ultrasonic agitation has more compact and uniform microstructure, smoother morphology. At the same time, the adhesion and corrosion resistance are greatly enhanced.
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
F. F. Wang and L. Li, "Investigation of Ultrasonic Electroplating Ni-P Coatings on Nd-Fe-B Permanent Magnet", Advanced Materials Research, Vols. 284-286, pp. 980-983, 2011