Plating solution for metallic surface wear-resistance coating

An anti-wear coating and metal surface technology, applied in the field of electroplating, can solve the problems of serious pollution and high energy consumption, and achieve the effects of high wear resistance and no environmental pollution

Inactive Publication Date: 2009-07-15
山东圣源娜菲尔贸易有限公司
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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

[0015] (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.

[0016] (2) Preparation of electroplating solution: nickel sulfate 30g / L, sodium tungstate 65g / L, ammonium citrate 100g / L, saccharin 1g / L and 1,4-butynediol 0.5g a few, the above ingredients according to the 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 of the plating tank and stir evenly, then adjust the pH value to 8.0 with concentrated ammonia water, and the current density is ...

Embodiment 2

[0024] (1) With embodiment 1.

[0025] (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.

[0026] (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.

[0027] (4) After...

Embodiment 3

[0030] (1) With embodiment 1.

[0031] (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.

[0032] (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.

[0033] (4) Af...

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Abstract

The invention relates to a metal surface wear-resistant coating electrolyte which is characterized in that the electrolyte comprises 300-100g/L of nickel sulfate, 40-65g/L of sodium tungstate, 80-100g/L of ammonium citrate, 0.5-2g/L of saccharin and 0.5-2.5g/L of 1,4-butynediol. In the invention, the wear-resistant coating is deposited on the metal surface by using electroplating technology, which does not discharge waste water and does not bring about pollution to environment. The microhardness of the coating is 1000-1250HV; the wearing resistance and the friction coefficient are higher than that of hard chromium plating. After the grinding test of a honing machine, compared with the hard chromium plating, the wear-resisting quantity rate is higher by 1.2-1.4 times.

Description

technical field [0001] The invention belongs to the technical field of electroplating, in particular to an electroplating solution 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 solution for the wear-resistant coating on the metal surface, so that the coating deposited on the metal surface after electroplating has higher wear resistance than the hard chromium coating, and the production process has no environmental pollution. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 曹新忠
Owner 山东圣源娜菲尔贸易有限公司
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