Chemical nickel plating process for bearing steel

A technology of electroless nickel plating and bearing steel, which is applied in the direction of liquid chemical plating, metal material coating technology, coating, etc., can solve the problems of complex composition of plating solution, cumbersome preparation of plating solution, slow deposition speed, etc. Good effect, simple raw material composition and preparation process, fast deposition speed

Pending Publication Date: 2022-07-29
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most electroless nickel-phosphorus plating formulations simply consider the performance indicators of nickel-plating phosphorus, such as brightness and hardness, etc., resulting in complex components of the plating solution and cumbersome preparation of the plating solution, resulting in too slow deposition speed, peeling, missing plating, and even In the end, the plating cannot be started, and the yield rate is low

Method used

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  • Chemical nickel plating process for bearing steel
  • Chemical nickel plating process for bearing steel
  • Chemical nickel plating process for bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , an electroless nickel plating process for bearing steel, which is specifically carried out according to the following steps:

[0028] S1, grinding and polishing

[0029] The surface of the bearing steel sample is first polished with 180-mesh, 320-mesh, 600-mesh, and 1000-mesh sandpaper once, then rough polished with 2.5μm diamond polishing liquid, and then finely polished with 0.5μm diamond polishing liquid to the mirror surface. Clean and dry with deionized water at room temperature. The sandpaper should be polished in the same direction until the sanding surface is covered with wear marks. When replacing the sandpaper, the bearing steel sample should be rotated 90° to ensure that the next grinding direction is the same as the previous one. vertical direction;

[0030] S2, alkaline degreasing

[0031] First immerse the polished bearing steel in an alkaline degreasing solution with a temperature of 70°C for 10 minutes, and then wash the bearing steel w...

Embodiment 2

[0039] The difference from Example 1 is:

[0040] In step S2, the raw material composition and content of the alkaline degreasing solution are 23 g / L of sodium hydroxide, 25 g / L of anhydrous sodium carbonate, 30 g / L of sodium phosphate, and 10 g / L of sodium silicate;

[0041] In step S5, the raw material composition and content of the electroless nickel plating solution are nickel sulfate 25g / L, sodium hypophosphite 25g / L, lactic acid 20ml / L, citric acid 8g / L, sodium acetate 20g / L, thiourea 2mg / L, the pH of the electroless nickel plating solution was 5.2, the temperature was 85° C., and the thickness of the obtained plating layer was 20 μm.

Embodiment 3

[0043] The difference from Example 1 is:

[0044] In step S2, the raw material composition and content of the alkaline degreasing solution are sodium hydroxide 25g / L, anhydrous sodium carbonate 30g / L, sodium phosphate 50g / L, and sodium silicate 20g / L;

[0045] In step S5, the raw material composition and content of the electroless nickel plating solution are nickel sulfate 30g / L, sodium hypophosphite 30g / L, lactic acid 30ml / L, citric acid 10g / L, sodium acetate 30g / L, thiourea 3mg / L, the pH of the electroless nickel plating solution was 6, the temperature was 90° C., and the thickness of the obtained plating layer was 30 μm.

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Abstract

A chemical nickel plating process for bearing steel is characterized in that the pretreated bearing steel is placed in a chemical nickel plating solution with the temperature of 80-90 DEG C and the pH value of 4-6 for plating, the chemical nickel plating solution comprises 20-30 g/L of nickel sulfate, 20-30 g/L of sodium hypophosphite, 10-30 ml/L of lactic acid and 5-10 g/L of citric acid, and the thickness of a plating layer is 5-30 microns. According to the design, the raw material composition and the preparation process are simple, the plating uniformity is high, the plating speed is high, the hardness is high, and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, and in particular relates to a chemical nickel plating process for bearing steel. Background technique [0002] Electroless nickel plating technology is one of the mainstream technologies in the current surface treatment industry, and is widely used in semiconductor, machinery, aerospace and other fields. Generally, in the process of electroless nickel plating, phosphorus will be reduced and deposited together with nickel, and finally a dense nickel-phosphorus coating will be formed on the surface of the part. The electroless nickel-phosphorus coating has excellent hardness, wear resistance, and corrosion resistance. It can also be mixed with second-phase particles such as alumina, molybdenum sulfide, silicon carbide, PTFE, etc. to further improve the performance of the coating in a certain aspect. The comprehensive performance of electroless nickel-phosphorus coating can be f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18
CPCC23C18/36C23C18/1806C23C18/1844
Inventor 梅顺齐柴旭辉杨晋宇郑权肖陟
Owner WUHAN TEXTILE UNIV
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