R-T-B surface treatment of permanent magnet

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PROBLEM TO BE SOLVED : To provide an R-T-B permanent magnet and its surface treatment method, where satisfactory corrosion resistance is applied by improving the uniformity of adhesion between a metal coating and an R-T-B permanent magnet body, in comparison with the conventional uniformity, while keeping magnetic properties equivalent to conventional equivalence or higher. SOLUTION : This surface treatment method of the R-T-B permanent magnet is characterized in that the R-T-B permanent magnet body with the main phase of an R2T14B intermetallic compound (R is one kind or two kinds among of rare earth elements which includes Y, and T is Fe or Fe and Co) is subjected to plating pretreatment by a mixed acidic solution, comprising nitride 1-100 g/liter and nitric acid 0.05-10 vol.%, and is thereafter subjected to plating.