Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer

An electroless nickel plating layer and permanent magnet technology, applied in the direction of magnetic objects, superimposed layer plating, metal material coating process, etc., can solve the problems of low porosity, slow plating speed, affecting production efficiency, etc. The effect of porosity, corrosion resistance improvement, and high speed

Inactive Publication Date: 2011-06-29
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main characteristics of electroless plating are: the coating is dense and the porosity is low; but the plating speed is slow, which affects the production efficiency to a certain extent

Method used

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  • Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer
  • Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer
  • Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The combined protection process of sintered NdFeB permanent magnet electroplating and electroless plating is carried out according to the following steps:

[0027] 1. First, the sintered NdFeB permanent magnet with a size of 31×31×25mm is treated before electroplating. The process is as follows:

[0028] Ultrasonic degreasing (temperature 60°C, time 5min)-tap water washing-tap water washing-nitric acid pickling (concentration 9%, room temperature, time 10s)-ultrasonic ash removal-nitric acid pickling (concentration 3.5%, room temperature, time 15s)- Ultrasonic ash removal-tap water washing-sulfuric acid surface activation (concentration 6%, room temperature, time 15s)-pure water washing.

[0029] 2. Electroplate the NdFeB permanent magnet,

[0030] a. First, put the magnet into the electroplating solution 1 with a pH value of 4.15 for electroplating. The composition of the plating solution 1 is nickel sulfate: 359.42g / L, nickel chloride: 50.05g / L, boric acid: 46.78g / L;...

Embodiment 2

[0044] The combined protection process of sintered NdFeB permanent magnet electroplating and electroless plating is carried out according to the following steps:

[0045] 1. First, the sintered NdFeB permanent magnet with a size of 40×27.7×2.4mm is treated before electroplating. The process is as follows:

[0046] Ultrasonic degreasing (temperature 65°C, time 4min) - tap water washing - tap water washing - nitric acid pickling (concentration 8%, room temperature, time 15s) - ultrasonic dedusting - nitric acid pickling (concentration 6%, room temperature, time 5s) - Ultrasonic ash removal-tap water washing-sulfuric acid surface activation (concentration 3%, room temperature, time 20s)-pure water washing.

[0047] 2. Electroplate the NdFeB permanent magnet,

[0048] a. First, put the magnet into the electroplating solution 1 with a pH value of 4.19 for electroplating. The composition of the plating solution 1 is nickel sulfate: 361.42g / L, nickel chloride: 51.05g / L, boric acid: ...

Embodiment 3

[0063] The combined protection process of sintered NdFeB permanent magnet electroplating and electroless plating is carried out according to the following steps:

[0064] 1. First, the sintered NdFeB permanent magnet with a size of 31×31×25mm is treated before electroplating. The process is as follows:

[0065] Ultrasonic degreasing (temperature 70°C, time 3min) - tap water washing - tap water washing - nitric acid pickling (concentration 6%, room temperature, time 20s) - ultrasonic ash removal - nitric acid pickling (concentration 4.5%, room temperature, time 10s) - Ultrasonic ash removal-tap water washing-sulfuric acid surface activation (concentration 9%, room temperature, time 10s)-pure water washing.

[0066] 2. Electroplate the NdFeB permanent magnet,

[0067] Put the magnet into the electroplating solution with a pH value of 4.3 for electroplating. The composition of the plating solution is nickel sulfate: 308.00g / L, nickel chloride: 60.14g / L, boric acid: 52.25g / L; the...

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Abstract

The invention provides an electroplating and chemical plating composite protecting process for an NdFeB permanent magnet and the NdFeB permanent magnet with a composite protective layer, relating to the surface treatment protecting process for the NdFeB permanent magnet. The invention aims at providing the NdFeB permanent magnet electroplating and chemical plating composite protecting process and the NdFeB permanent magnet with the composite protective layer with high production efficiency and good corrosion resistance. The electroplating and chemical plating composite protecting process for the NdFeB permanent magnet comprises the following steps: (1) pre-treatment: the NdFeB permanent magnet is subjected to oil removal, dust removal and surface activation; (2) electroplating: the surface of the NdFeB permanent magnet is electroplated; (3) transitional treatment: the electroplated NdFeB permanent magnet is subjected to water cleaning and surface activation; (4) chemical plating: nickel is plated chemically outside the electroplating layer of the NdFeB permanent magnet; and (5) post-treatment: the chemically plated NdFeB permanent magnet is subjected to water cleaning, surface adjustment and drying.

Description

technical field [0001] The invention relates to a surface treatment and protection technology of NdFeB permanent magnets, in particular to a composite protection technology combining electroplating and electroless plating. Background technique [0002] As the third-generation rare earth permanent magnet material, NdFeB magnets have extremely high magnetic energy product and coercive force, and the advantages of high energy density make them not only widely used in information technology, automobiles, nuclear magnetic resonance and motors, but also in wind power The application of environmentally friendly new energy fields such as power generation and hybrid vehicles is also increasing. The high magnetic energy of NdFeB stems from its special chemical composition and metallographic structure: NdFeB magnets are composed of Nd-rich phase and Nd 2 Fe 14 The main phase is composed of B, and this structure and composition make it extremely easy to corrode, and the magnetic perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C25D5/14C23C18/34H01F1/057H01F7/02
Inventor 王玉林史丙强王刚李磊侯晓红
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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