Method for depositing a composite film on a permanent neodymium-iron-born magnet

A method for depositing a composite film on a permanent Nd—Fe—B magnet including grease and dust using a multi-arc ion plating apparatus defining a chamber and including a target source of metal disposed in the chamber and a jig disposed in the chamber and rotatably attached to the multi-arc ion plating apparatus and an arc source including a control magnet disposed in the chamber, said method comprising the steps of;

• removing grease and dust from a permanent Nd—Fe—B magnet to produce a purified permanent Nd—Fe—B magnet,
• disposing the purified permanent Nd—Fe—B magnet in a chamber of a multi-arc ion plating apparatus,
• removing air from the chamber of the multi-arc ion plating apparatus to lower pressure in the chamber of the multi-arc ion plating apparatus to a first reduce pressure,
• applying an electric potential to the purified permanent Nd—Fe—B magnet in the chamber of the multi-arc ion plating apparatus to clean the purified permanent Nd—Fe—B magnet,
• depositing a first film of metal on the purified permanent Nd—Fe—B magnet using an arc source to produce a coated permanent Nd—Fe—B magnet,
• depositing an anti-corrosive film on the coated permanent Nd—Fe—B magnet to produce a layered permanent Nd—Fe—B magnet,
• said step of depositing the anti-corrosive film being further defined as spraying the anti-corrosive film of a composite resin on the coated permanent Nd—Fe—B magnet.