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Technology for electroplating tungsten-cobalt-nickel alloy on surface of structural steel

A technology of structural steel and nickel alloy, which is applied in the field of electroplating, can solve the problems of aggravated wear, easy peeling, poor wear resistance, etc., and achieve good corrosion resistance and friction resistance, small environmental hazards, and good combination effects

Inactive Publication Date: 2014-12-24
无锡市锡山区鹅湖镇荡口青荡金属制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nickel-based alloy coatings are not up to the requirements of hard chrome coatings in terms of wear resistance and hardness.
Nickel-based alloys are face-centered cubic lattices, and in the process of rubbing against the counterpart metal, they tend to be severely adhered to the counterpart metal, thereby aggravating wear and having poor wear resistance
At the same time, the hardness of the nickel-based alloy coating is not high. For nickel-tungsten alloys, when the tungsten content in the alloy coating exceeds 30%, the microhardness value is 400-600Hv, which must be subjected to high-temperature heat treatment (300-500°C ) can make its hardness reach about 1000Hv, and after heat treatment, the brittleness of the nickel-tungsten coating increases significantly, and the bonding force between the coating and the base material is very poor, and it is easy to peel off, which is difficult to have practical application value
[0004] Therefore, there is no particularly suitable substitute for the chrome-plated layer in the prior art. Because people pay more and more attention to environmental protection, the chrome-plated process and products that will bring a lot of pollution in the production process urgently need a new process and product replacement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A process for electroplating tungsten-cobalt-nickel alloy on the surface of structural steel, the composition of the plating solution used in the process is: cobalt sulfate 12g / L, sodium tungstate 84g / L, nickel sulfate 14g / L, boric acid 38g / L, sodium sulfate 30g / L L, ammonium sulfate 24g / L, tartaric acid 30g / L, potassium pyrophosphate 15g / L, ascorbic acid 10g / L, formaldehyde 3ml / L, dimethylhexynol 2ml / L, surplus is water, and described process is: After the structural steel is cleaned and activated, put it into the above-mentioned plating solution, use stainless steel as the anode, adjust the pH value to 7.5-8.5 with ammonia water, heat to 50-60°C, and control the current density to 12-16A / dm 2 , electroplating for 20 minutes.

Embodiment 2

[0013] A process for electroplating tungsten-cobalt-nickel alloy on the surface of structural steel, the composition of the plating solution used in the process is: cobalt sulfate 18g / L, sodium tungstate 80g / L, nickel sulfate 18g / L, boric acid 34g / L, sodium sulfate 36g / L L, ammonium sulfate 20g / L, tartaric acid 34g / L, potassium pyrophosphate 11g / L, ascorbic acid 14g / L, formaldehyde 1ml / L, dimethylhexynol 4ml / L, surplus is water, and described process is: After the structural steel is cleaned and activated, put it into the above-mentioned plating solution, use stainless steel as the anode, adjust the pH value to 7.5-8.5 with ammonia water, heat to 50-60°C, and control the current density to 12-16A / dm 2 , electroplating for 30 minutes.

Embodiment 3

[0015] A process for electroplating tungsten-cobalt-nickel alloy on the surface of structural steel, the composition of the plating solution used in the process is: cobalt sulfate 15g / L, sodium tungstate 82g / L, nickel sulfate 16g / L, boric acid 36g / L, sodium sulfate 33g / L L, ammonium sulfate 22g / L, tartaric acid 32g / L, potassium pyrophosphate 13g / L, ascorbic acid 12g / L, formaldehyde 2ml / L, dimethylhexynol 3ml / L, surplus is water, and described process is: After the structural steel is cleaned and activated, put it into the above-mentioned plating solution, use stainless steel as the anode, adjust the pH value to 7.5-8.5 with ammonia water, heat to 50-60°C, and control the current density to 12-16A / dm 2 , electroplating for 25 minutes.

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Abstract

The invention discloses a technology for electroplating a tungsten-cobalt-nickel alloy on a surface of structural steel. A plating solution adopted in the technology is composed of 12-18 g / L of cobalt sulfate, 80-84 g / L of sodium tungstate, 14-18 g / L of nickel sulfate, 34-38 g / L of boric acid, 30-36 g / L of sodium sulfate, 20-24 g / L of ammonium sulfate, 30-34 g / L of tartaric acid, 11-15 g / L of potassium pyrophosphate, 10-14 g / L of ascorbic acid, 1-3 ml / L of formaldehyde, 2-4 ml / L of dimethyl hexynol, and the balance being water. The technology comprises the steps of washing and activating the structural steel; then putting the structural steel in the above plating solution; taking stainless steel as an anode; adjusting a pH value to 7.5-8.5 with ammonia water; heating to a temperature of 50-60 DEG C; controlling a current density at 12-16 A / dm<2> and electroplating for 20-30 minutes.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a process for electroplating a tungsten-cobalt-nickel alloy on the surface of structural steel. Background technique [0002] With the rapid development of modern automobile industry, machinery industry, aviation and aerospace industry, more and more high-load cylinder pistons and sliding parts are used under the action of dry friction, hydraulic pressure and lubricating oil medium. Electroplating high-hardness, high-temperature-resistant, corrosion-resistant and fatigue-resistant coating materials on the surface of sliding parts is an effective way to solve the problem of sintering and strain on the surface of parts due to temperature rise during friction, which can greatly improve the service life of equipment. , increasing the economic cost. [0003] Hard chrome plating has good hardness, wear resistance and corrosion resistance, and hard chrome plating on the surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/26
Inventor 钱永清
Owner 无锡市锡山区鹅湖镇荡口青荡金属制品厂
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