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To improve the performance of ndfeb magnet chemical nickel plating post-processing

by:Newland     2020-05-04
Ndfeb magnet after electroless nickel plating, heat treatment approaches such as baking hydrogen removal performance, improve the chemical plating nickel layer to give a higher corrosion resistance, abrasion resistance and other surface features, surface of ndfeb magnets can be all kinds of subsequent processing. Ndfeb magnet chromate passivation treatment after plating after cleaning chemical nickel plating layer in dilute aqueous solution of chromium anhydride ( CrO3,1- 10%) In a few minutes, take out after washing dry, improve the corrosion resistance of coating. Some goods of chromic acid solution contains film-former, wetting agent and other additives. Except passivation effect, also have closed film role, thus improve the chemical plating nickel layer of discoloration resistance and corrosion resistance of the effect is obvious. Ndfeb magnets plating anode sex coating ndfeb magnets again on high phosphorus chemical nickel plating layer plating a thin layer with low phosphorus content of chemical nickel layer, form a double-layer structure of electroless nickel plating. Due to the low phosphorus chemical nickel plating on the surface of electrode potential is low, become the sacrificial anode protection layer, significantly improve the corrosion resistance of the plating. Also, in order to improve the long-term corrosion resistance performance of plating parts, on the chemical nickel plating layer covering electricity galvanized, cadmium or other sacrifice anode alloy surface. Even after the plating zinc, cadmium for high temperature heat treatment, the purpose is to improve coating ductility, in different metal layer interface area can form diffusion layer. Practical application results show that after the post-processing technique adopted ndfeb magnets, oceanic and atmospheric corrosion resistance of steel pieces of about 10 times. Ndfeb magnet surface functionalization post-processing in the non-magnetic chemical nickel plating layer vacuum sputtering deposition on the surface of a thin layer ( 1 - 3 microns) High coercive force of magnetic materials, such as cobalt base alloy, the formation of high performance magnetic recording device. The manufacturing process of computer hard disk is to get the technical specification. High density printed circuit surface selective electroless nickel plating, and then in the chemical nickel plating layer surface leaching gold plated or chemical plating 0. 3 - 0. 8 microns, will greatly improve the surface electric connection performance. Ndfeb magnet chemical nickel plating layer in dilute nitric acid or some special oxidizing medium form the surface of the conversion film, it has good optical absorption and emission features, known as 'super black film, especially suitable for solar energy absorption device.
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