Corrosion behaviour of sintered NdFeB deposited with an aluminium coating
Abstract
A protective, pure Al coating was deposited by direct current (DC) magnetron sputtering onto sintered NdFeB magnets. Separated, single phases of sintered NdFeB (the Nd-rich phase, the B-rich phase and the matrix phase) were prepared by arc melting for open circuit potential (OCP) tests. The corrosion process of the sintered NdFeB magnets coated with Al (Al/NdFeB) was studied experimentally. It was found that the corrosion process can be divided into three different stages. The Al coating cannot provide complete sacrificial protection for the sintered NdFeB magnets.
- Publication:
-
Corrosion
- Pub Date:
- 2011
- DOI:
- 10.1016/j.corsci.2011.02.006
- Bibcode:
- 2011Corro..53.1887M
- Keywords:
-
- A. Aluminium;
- A. Rare earth elements;
- B. EIS;
- C. Pitting corrosion