Cr-Ni alloy plating solution and electroplate method

An alloy electroplating solution and a technology for electroplating solution, which are applied in the field of electroplating chromium process, can solve the problems of restricting the large-scale application of Cr-Ni alloy electroplating, low Cr content in the coating layer, and low current efficiency of the plating solution, and improve the quality of the coating layer and the thickness of the coating layer. Large, strong coating adhesion effect

Inactive Publication Date: 2015-05-13
WUXI XUEJIANG ENVIRONMENT ENG EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing Cr-Ni alloy electroplating has technical defects such as low Cr content in the coating, insufficient thickness of the coating, poor bonding force of the coating and low current efficiency of the plating solution, which seriously restrict the industrial application of Cr-Ni alloy electroplating. large scale application

Method used

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  • Cr-Ni alloy plating solution and electroplate method
  • Cr-Ni alloy plating solution and electroplate method
  • Cr-Ni alloy plating solution and electroplate method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The formula of Cr-Ni alloy electroplating solution is as follows:

[0035]

[0036] Plating process conditions: the pulse width of the single pulse square wave current is 1ms, the duty cycle is 30%, and the average current density is 6A / dm 2 ; The pH is 2, the temperature is 30°C, and the electroplating time is 70min.

Embodiment 2

[0038] The formula of Cr-Ni alloy electroplating solution is as follows:

[0039]

[0040] Plating process conditions: the pulse width of the single pulse square wave current is 1ms, the duty cycle is 25%, and the average current density is 7A / dm 2 ; The pH is 2.5, the temperature is 40°C, and the electroplating time is 60min.

Embodiment 3

[0042] The formula of Cr-Ni alloy electroplating solution is as follows:

[0043]

[0044]

[0045] Plating process conditions: the pulse width of the single pulse square wave current is 2ms, the duty cycle is 20%, and the average current density is 8A / dm 2 ; The pH is 2.5, the temperature is 45°C, and the electroplating time is 50min.

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Abstract

The invention discloses a Cr-Ni alloy plating solution and an electroplate method. The Cr-Ni alloy plating solution comprises the following components by content: 0.65-0.9mol/L chromium trichloride, 0.1-0.4mol/L nickel sulfate, 0.15-0.35mol/L formic acid, 0.4-0.65mol/L citrate, 0.3-0.5mol/L oxalate, 1-2mol/L urea and 1-2mol/L ammonium bromide. According to the invention, citrate, oxalate and urea are selected as a coordination agent, citrate, oxalate and urea are better coordinated with trivalent chromium and bivalent nickel through cooperative effect; methylsulfonate is taken as a buffering agent and a coordination promoter; ammonium bromide is taken as conducting salt, wherein the bromide ions can inhibit generation of hexavalent chromium ions and precipitation of chlorine. The current efficiency of the Cr-Ni alloy plating solution is higher, and a coating layer has the advantages of high Cr content, large thickness, and strong coating bonding force.

Description

technical field [0001] The invention relates to the technical field of chromium electroplating technology, in particular to a Cr-Ni alloy electroplating solution and an electroplating method. Background technique [0002] Cr is a silver-white metal with a slight bluish tint. It is easily passivated in the air, and the surface is covered with an oxide film. It has good corrosion resistance, is stable in the atmosphere, and can maintain its luster for a long time; , Sulfide, carbonate solution and organic acid are very stable. Cr has high hardness, small friction coefficient, good wear resistance, corrosion resistance and heat resistance. The Cr coating has the advantages of bright surface, high hardness, and corrosion resistance. It is a good protective and decorative coating, and is widely used in many fields such as automobiles and aerospace. However, the Cr coating will become soft at higher temperatures, and the hardness value begins to decrease at 300°C, and the coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
CPCC25D3/56C25D3/562
Inventor 曾雄燕
Owner WUXI XUEJIANG ENVIRONMENT ENG EQUIP
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