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Chemical nickel phosphor plating solution for surface acidity of sintered NdFeB magnet, and nickel phosphor plating process

A technology for electroless nickel-phosphorus and neodymium-iron-boron plating, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problem of increased labor and production costs, unenvironmental protection of plating solution and process, and large environmental pollution problems, to achieve the effect of easy industrial control, no magnetic loss rate, and little environmental pollution

Inactive Publication Date: 2016-03-02
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its neutral chemical plating and acidic high phosphorus chemical plating solution contain toxic heavy metal ions Pb 2+ , and hexavalent chromium is used for passivation treatment, the plating solution and process are not environmentally friendly, causing great environmental pollution, and the process is cumbersome, increasing labor and production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of nickel-plating phosphorus solution is as follows: 40g of tartaric acid, 6g of succinic acid and 30g of sodium acetate are added to water and heated to dissolve, 26g of nickel sulfate is added to water to dissolve, and then these two solutions are mixed and stirred evenly, recorded as solution A, Dissolve 26g of sodium hypophosphite in water, then slowly pour it into solution A while stirring, stir evenly, and record it as solution B, dissolve 1g of sodium fluoride and 1mg of thiourea in water, slowly pour it into solution B, and constant volume In the process of reaching 1L, adjust the pH value to 4.8 with ammonia water, and serve.

[0035] A sintered NdFeB magnet surface acidic nickel-phosphorus plating solution, the pH value of the nickel-phosphorus plating solution is 4.8, which consists of:

[0036] Nickel sulfate 26g / L,

[0037] Sodium hypophosphite 26g / L,

[0038] Tartaric acid 40g / L,

[0039] Succinic acid 6g / L,

[0040] Sodium aceta...

Embodiment 2

[0051] The preparation method of the nickel-plating phosphorus solution is as follows: 42g of tartaric acid, 8g of succinic acid and 32g of sodium acetate are added to water and heated to dissolve, 28g of nickel sulfate is added to water to dissolve, and then the two solutions are mixed and stirred evenly, which is recorded as solution A. Dissolve 28g of sodium hypophosphite in water, then slowly pour it into solution A while stirring, stir evenly, and record it as solution B, dissolve 1.5g of sodium fluoride and 3mg of thiourea in water, slowly pour it into solution B, and set During the process of making the volume to 1L, adjust the pH value to 4.6 with ammonia water, and it is ready.

[0052] A sintered NdFeB magnet surface acidic nickel-phosphorus plating solution, the pH value of the nickel-phosphorus plating solution is 4.6, which consists of:

[0053] Nickel sulfate 28g / L,

[0054] Sodium hypophosphite 28g / L,

[0055] Tartaric acid 42g / L,

[0056] Succinic acid 8g / L,...

Embodiment 3

[0068] The preparation method of the nickel-plating phosphorus solution is as follows: 35g of tartaric acid, 4g of succinic acid and 25g of sodium acetate are added to water and heated to dissolve, 25g of nickel sulfate is added to water to dissolve, and then the two solutions are mixed and stirred evenly, recorded as solution A, Dissolve 20g of sodium hypophosphite in water, then slowly pour into solution A while stirring, stir evenly, and record it as solution B, dissolve 0.5g of sodium fluoride and 1mg of thiourea in water, slowly pour into solution B, and set During the process of making the volume to 1L, adjust the pH value to 5.0 with ammonia water, and it is ready.

[0069] A sintered NdFeB magnet surface acidic nickel-phosphorus plating solution, the pH value of the nickel-phosphorus plating solution is 5.0, which consists of:

[0070] Nickel sulfate 25g / L,

[0071] Sodium hypophosphite 20g / L,

[0072] Tartaric acid 35g / L,

[0073] Succinic acid 4g / L,

[0074] Sodi...

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Abstract

The invention relates to a chemical nickel phosphor plating solution for surface acidity of a sintered NdFeB magnet. The pH value of the chemical nickel phosphor plating solution is 4.5 to 5.0, and the chemical nickel phosphor plating solution comprises dissoluble nickel salt, a reducing agent, a composite complex agent, a buffer agent, a promoter and a stabilizer. The nickel phosphor plating process comprises the following steps: (1), carrying out ultrasonic acid pickling on the sintered NdFeB magnet for 20 to 40s, then carrying out ultrasonic water washing and regular water washing; (2), under a temperature of 55 to 60 DEG C, carrying out ultrasonic alkaline washing for 5 to 12 min, then carrying out ultrasonic water washing and regular water washing; (3), carrying out ultrasonic activation for 20 to 40s at a room temperature; and (4), placing into the nickel phosphor plating solution, carrying out ultrasonic plating for 60 to 180 min, and then carrying out water washing and drying. The nickel phosphor plating solution is environment friendly and has less pollution to the environment, an obtained clad layer is even in thickness, the porosity is low, magnetism loss is avoided, and corrosion resistance is excellent; and the nickel phosphor plating process is simple, the cost is low, and the binding force of the clad layer and a basal body is strong.

Description

technical field [0001] The invention relates to a nickel-phosphorous plating solution and a nickel-phosphorous plating process thereof, in particular to an acidic electroless nickel-phosphorous plating solution and a nickel-phosphorous plating process on the surface of a sintered NdFeB magnet. Background technique [0002] The third-generation sintered NdFeB material has been widely used in industry because of its excellent magnetic properties, mechanical properties, and good processability. However, due to the chemical composition and the particularity of the preparation process of the sintered NdFeB magnet material, it has certain characteristics. For example, the sintered NdFeB permanent magnet alloy has a multi-phase structure, and the oxidation resistance and resistance of each phase Corrosion properties are different, the active neodymium-rich phase and boron-rich phase in the material are easy to interact with the main phase Nd 2 Fe 14 B forms a primary battery, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18
Inventor 刘琳胡盛青张铁军赵宝宝唐璐
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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