Method for electroplating zinc-nickel alloy on sintered neodymium iron boron

Abstract

The invention discloses a method for electroplating zinc-nickel alloy on sintered neodymium iron boron. The method comprises the following steps that (1) a sintered neodymium iron boron magnet is pretreated to obtain the pretreated magnet; (2) the pretreated magnet is soaked in a solution of 80-85 DEG C for chemical nickel plating for 15-30 minutes; (3) the magnet subjected to nickel plating is subjected to copper electroplating; (4) the magnet subjected to copper electroplating serves as a cathode and is put into a zinc-nickel alloy electroplating solution for electroplating to obtain a zinc-nickel alloy electroplated product; and (5) the electroplated product is subjected to post-treatment. The chemical nickel plating thickness is 2-10 microns, the electrocoppering is alkaline copperingor pyrophosphate coppering, and the electrocoppering thickness is 1-15 microns. The method solves the problems of poor deep plating capability and low corrosion resistance of the neodymium iron boronmagnet, and has the advantages of improving the deep plating capability of the sintered neodymium iron boron magnet, directly forming the zinc-nickel alloy coating on the surface of the sintered neodymium iron boron magnet, improving the current efficiency on the premise of ensuring the corrosion resistance of the magnet, and the like.

Description

technical field [0001] The invention relates to the technical field of surface treatment and anticorrosion of sintered NdFeB materials, in particular to a method for electroplating zinc-nickel alloys of sintered NdFeB materials. Background technique [0002] As the third generation permanent magnet material, sintered NdFeB permanent magnet material has high magnetic properties, abundant resources and low price, and is widely used in automobiles, computers, nuclear magnetic resonance and other fields. However, since sintered NdFeB is composed of multiple phases, the potential difference of each phase is relatively large, especially the Nd-rich phase has a low potential, which is prone to intergranular corrosion, resulting in poor corrosion resistance of NdFeB itself, which seriously restricts Application of NdFeB. In order to solve this problem, a series of surface treatment technologies for NdFeB protection have been invented, mainly including electro-galvanizing, electro-n...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for sintered NdFeB electroplating zinc-nickel alloy, which has the ability to improve the deep plating ability of sintered NdFeB magnets, and directly forms a zinc-nickel alloy coating on the surface of sintered NdFeB magnets, On the premise of ensuring the corrosion resistance of the magnet, it improves the current efficiency and other advantages, and solves the problems of poor deep plating ability and low corrosion resistance of NdFeB magnets.

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