FILM DEPOSITION METHOD FOR R-T-B BASED MAGNET

摘要

PROBLEM TO BE SOLVED: To provide a method for depositing a film for an R-T-B based magnet consisting of a new chemical conversion film which does not contain chromium. SOLUTION: An R-T-B based magnet body consisting of an R2T14B intermetallic compound (R is at least one kind selected from rare earth elements including Y, and T is Fe or Fe and Co) as the main phase is subjected to chemical conversion treatment with a chemical conversion solution in which the molar ratio of Mo to P [Mo/P] is 1 to 30 and which contains 0.03 to 3 g/l pyrophosphate and 0.05 to 3 mil/l hydrogen peroxide.