The rare-earth permanent magnet electric Ni plating method

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PROBLEM TO BE SOLVED : To provide an Ni electroplating method for forming an Ni plating film which has excellent uniform electrodepositing properties, densiness and appearance on the surface of a rare earth based magnet by using an Ni plating solution having a new composition. SOLUTION : In the Ni electroplating method for a rare earth based permanent magnet, an Ni plating film is formed on the surface of a magnet by using a plating solution. The plating solution contains Ni ions and chlorine ions by the contents which control the weight ratio of the Ni ion concentration to the chlorine ion concentration (Ni2+/Cl-) to 0.19 to 11.4 and, as a buffering agent, at least one kind selected from succinic acid, malonic acid, citric acid, malic acid, acetic acid and the salts thereof by 0.03 to 1.0 mol/l and boric acid by 0 to 15 g/l are used.