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Electroplating process for metallic surface wear-resistance coating

An electroplating process and anti-wear coating technology, which is applied in the field of metal surface anti-wear coating electroplating process, can solve the problems of serious pollution and high energy consumption

Active Publication Date: 2009-08-05
曹新忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two methods have high energy consumption, serious pollution, and produce a large amount of waste water containing chromium ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Pre-plating treatment of metal workpieces: follow the conventional metal surface treatment method or install the following steps: fix the metal workpiece on the fixture, electrolytic degreasing, activate the metal surface with acid, roughening treatment, chemical degreasing, tap water Cleaning, electrolytic degreasing, tap water cleaning, acid activation, tap water cleaning, ultrasonic cleaning and deionized water cleaning. Each step is carried out in accordance with known techniques.

[0015] (2) Preparation of electroplating solution: 30g / L of nickel sulfate, 65g / L of sodium tungstate, 100g / L of ammonium citrate, 1g / L of saccharin and 0.5g / L of 1,4-butynediol. Dissolve the required amount in a small amount of water respectively, then mix and stir evenly in order, then dilute with water to the specified amount of the plating tank and stir evenly, then adjust the pH value to 8.0 with concentrated ammonia water, and the current density is 1A / dm 2 Electrolysis for 7 ...

Embodiment 2

[0023] (1) With embodiment 1.

[0024] (2) Preparation of electroplating solution: nickel sulfate 60g / L, sodium tungstate 40g / L, ammonium citrate 90g / L, saccharin 2g / L and 1,4-butynediol 1g / L, mix the above ingredients as required Dissolve the amount in a small amount of water respectively, then mix and stir evenly in order, then dilute with water to the specified amount in the plating tank and stir evenly, then adjust the pH value to 7.8 with concentrated ammonia water, and the current density is 2A / dm 2 Electrolysis for 8 hours.

[0025] (3) Electroplating implementation process: raise the temperature of the prepared electroplating solution to 80°C, and keep the pH value stable at 7.8 during the electroplating process. Current density 8A / dm 2 . The anode is made of stainless steel with strong corrosion resistance. The electroplating speed is 4μm / h, and a bright and wear-resistant coating is formed on the metal surface. The coating thickness is 25 μm.

[0026] (4) After...

Embodiment 3

[0029] (1) With embodiment 1.

[0030] (2) Preparation of electroplating solution: nickel sulfate 95g / L, sodium tungstate 50g / L, ammonium citrate 80g / L, saccharin 0.5g / L and 1,4-butynediol 2.5g / L, the above ingredients according to Dissolve the required amount in a small amount of water respectively, then mix and stir evenly in order, then dilute with water to the specified amount in the plating tank and stir evenly, then adjust the pH value to 8.4 with concentrated ammonia water, and the current density is 2A / dm 2 Electrolysis for 7 hours.

[0031] (3) Electroplating implementation process: raise the temperature of the prepared electroplating solution to 70°C, and keep the pH value at 8.4 during the electroplating process. Current density 5A / dm 2 . The anode is made of stainless steel with strong corrosion resistance. The electroplating speed is 3μm / h, and a bright and wear-resistant coating is formed on the metal surface. The coating thickness is 21 μm.

[0032] (4) Af...

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Abstract

The invention relates to an electroplating technology of a wear-resistant coating on a metal surface. A metal work piece after pre-electroplating treatment is placed in a prepared electroplating solution of 60 DEG C to 80 DEG C, a pH value is stably kept to range from 7.8 to 8.4, and a current density is kept at 4-9 A / dm in an electroplating process. The preparation process of the prepared electroplating solution comprises the following steps: constituents of the electroplating solution, namely 30-100g / L of nickel sulfate, 40-65g / L of sodium tungstate, 80-100g / L of ammonium citrate, 0.5-2g / L of saccharine and 0.5-2.5g / L of 1,4-butynediol are sequentially added, mixed and stirred uniformly, are diluted by water to the normal weight of a plating bath and are regulated by strong ammonia so that the pH value is from 7.8 to 8.4, and the solution is electrolyzed for at least six hours at the current density of 1-2A / dm2. The invention adopts the electroplating technology to deposite the wear-resistant coating on the metal surface, does not discharge waste water and does not pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of electroplating, in particular to an electroplating process for an anti-friction coating on a metal surface. Background technique [0002] The metal surface is wear-resistant and anti-corrosion, and has been relying on chemical hard chromium plating and electroplating hard chromium plating for many years. The two methods have high energy consumption, serious pollution, and produce a large amount of waste water containing chromium ions. After discharge, it will cause serious pollution to rivers, especially ground water sources. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an electroplating process for the anti-wear coating on the metal surface, the coating has higher wear resistance than the hard chrome coating, and the production process has no environmental pollution. [0004] The electroplating process of the metal surface wear-resistant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/50
Inventor 曹新忠
Owner 曹新忠
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