Zinc-zinc nickel electroplating method of neodymium iron boron magnet

A neodymium-iron-boron and magnet technology is applied in the field of zinc-zinc-nickel electroplating of neodymium-iron-boron magnets to achieve the effects of low cost and improvement of hexavalent chromium problems

Inactive Publication Date: 2017-06-13
BEIJING JINGCI ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Another object of the present invention is to solve the problem that there is no problem in the appearance of direct electroplating zinc-nickel alloy on the NdFeB substrate, but the electronic products in the industry have binding force requirements (free fall), and direct electroplating zinc-nickel alloy cannot meet the binding force requirements. Therefore, the coating structure of electro-galvanized + zinc-nickel alloy is matched

Method used

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Embodiment Construction

[0035] The present invention will be described in further detail below, so that those skilled in the art can implement it with reference to the description.

[0036] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0037] The invention provides an electroplating method for an NdFeB magnet. The process flow is as follows: grinding and chamfering → degreasing → pickling → ultrasonic cleaning → electro-galvanizing (acid) → activation → electro-plating zinc-nickel alloy → light-emitting → trivalent chromium passivation → drying.

[0038] 1. Grinding and chamfering

[0039] Use a vibration or centrifugal grinding chamfering machine, use brown corundum abrasives, remove the burrs on the surface of the product, and grind the right angles at the corners into R angles.

[0040] 2. Degreasing

[0041] Use metal cleaning agent to remove oil st...

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Abstract

The invention provides a zinc-zinc nickel electroplating method of a neodymium iron boron magnet. The method comprises the steps of grinding and chamfering-deoiling-acid pickling-ultrasonic cleaning-galvanizing (acid)-activation-nickel alloy galvanizing-bright dipping-trivalent chromium passivation-drying. A neodymium iron magnet is prepared by the zinc-zinc nickel electroplating method of the neodymium iron boron magnet; a zinc layer is 2-5 microns; a zinc nickel layer is 5-10 microns; the corrosion resistance is achieved under the neutral salt mist environment for 2h and the environment of 40 DEG C and 90% of humidity for 168h; the binding force of the neodymium iron boron magnet can satisfy the requirement of falling by 1.8 m*30 times; the magnetic reducing loss is not increased (not more than 6%); the hexavalent chromium problem is solved (hexavalent chromium is not more than 1000 ppm); and the cost is lower than that of nickel electroplating of copper nickel.

Description

technical field [0001] The invention belongs to the field of material surface electroplating, and in particular relates to a zinc-zinc-nickel electroplating method for an NdFeB magnet. Background technique [0002] Common surface treatment methods for NdFeB include: electro-galvanizing, nickel-copper-nickel electroplating, electrophoresis, phosphating, etc. Products used in electronic devices such as mobile phones, speakers, bracelets, tablet computers, etc. require the surface of the magnet to be electro-galvanized (it has high requirements for demagnetization and adhesiveness of the magnet, so galvanized is selected for comparison of several surface treatment methods), With the increase in the use environment of terminal products in recent years, the quality requirements for the corrosion resistance test of the product have been increased (not only the neutral salt spray test, but also the requirements for temperature, humidity and acetic acid test), the original magnet su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D3/56C25D5/36C25D7/00C23C22/06C23C28/00
CPCC25D3/22C23C22/06C23C28/321C23C28/3225C23C28/34C23C2222/10C25D3/56C25D5/36C25D7/001
Inventor 张健韩继虎
Owner BEIJING JINGCI ELECTRIC TECH CO LTD
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