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

A technology of iron-cerium alloy and structural steel, which is applied in the field of electroplating tungsten-cobalt-iron-cerium alloy on the surface of structural steel, which can solve the problems of aggravated wear, easy peeling, poor wear resistance, etc., and achieve good corrosion resistance and friction resistance, and environmental hazards small, combined with good effect

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-iron-cerium alloy on the surface of structural steel, the composition of the plating solution used in the process is: cobalt sulfate 32g / L, sodium tungstate 84g / L, ferrous sulfate 22g / L, cerium sulfate 2.5g / L, Boric acid 34g / L, sodium sulfate 36g / L, ammonium sulfate 20g / L, tartaric acid 34g / L, potassium pyrophosphate 11g / L, ascorbic acid 14g / L, formaldehyde 1ml / L, dimethylhexynol 4ml / L, sulfur Urea is 4mg / L, and the balance is water. The process is as follows: cleaning and degreasing the structural steel to activate it, then putting it into the plating solution of the above composition as the cathode, using stainless steel as the anode, and adjusting the pH value to 3.5-4.5 with acetic acid, Heat to 50-60°C, control the current density to 12-16A / dm 2 , electroplating for 20 minutes.

Embodiment 2

[0013] A process for electroplating tungsten-cobalt-iron-cerium alloy on the surface of structural steel, the composition of the plating solution used in the process is: cobalt sulfate 36g / L, sodium tungstate 80g / L, ferrous sulfate 26g / L, cerium sulfate 1.5g / L, Boric acid 38g / L, sodium sulfate 30g / L, ammonium sulfate 24g / L, tartaric acid 30g / L, potassium pyrophosphate 15g / L, ascorbic acid 10g / L, formaldehyde 3ml / L, dimethylhexynol 2ml / L, sulfur Urea is 6mg / L, and the balance is water. The process is as follows: the structural steel is cleaned and degreased to be activated, then put into the plating solution of the above composition as the cathode, and the stainless steel is used as the anode, and the pH value is adjusted to 3.5-4.5 with acetic acid. Heat to 50-60°C, control the current density to 12-16A / dm 2 , electroplating for 30 minutes.

Embodiment 3

[0015] A process for electroplating tungsten-cobalt-iron-cerium alloy on the surface of structural steel, the composition of the plating solution used in the process is: cobalt sulfate 34g / L, sodium tungstate 82g / L, ferrous sulfate 24g / L, cerium sulfate 2g / L, boric acid 36g / L, sodium sulfate 33g / L, ammonium sulfate 22g / L, tartaric acid 32g / L, potassium pyrophosphate 13g / L, ascorbic acid 12g / L, formaldehyde 2ml / L, dimethylhexynol 3ml / L, thiourea 5mg / L, and the balance is water. The process is as follows: clean the structural steel to remove oil and activate it, then put it into the above-mentioned plating solution as the cathode, use stainless steel as the anode, adjust the pH value to 3.5-4.5 with acetic acid, and heat To 50-60℃, control the current density at 12-16A / dm 2 , electroplating for 25 minutes.

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Abstract

The invention discloses a technology for electroplating a tungsten-cobalt-iron-cerium alloy on a surface of structural steel. A plating solution adopted by the technology is composed of 32-36 g / L of cobalt sulfate, 80-84 g / L of sodium tungstate, 22-26 g / L of ferrous sulfate, 1.5-2.5 g / L of cerium 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, 4-6 mg / L of thiourea, and the balance being water. The technology comprises the steps of washing and activating the structural steel by removing oil; then putting the structural steel in the above plating solution to be used as a cathode; taking stainless steel as an anode; adjusting a pH value to 3.5-4.5 with acetic acid; 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-iron-cerium 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 coating has good hardness, wear resistance and corrosion resistance, and hard chrome plating on the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/36C25D5/26
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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