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Cr-Ni alloy electroplating liquid and electroplating method

An alloy electroplating solution and technology of electroplating solution, applied in the field of electroplating solution, can solve the problems of insufficient dispersing ability and deep plating ability of electroplating solution, complicated formula, poor hardness and corrosion resistance of coating layer, etc.

Inactive Publication Date: 2015-12-02
WUXI QINGYANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing chromium-nickel alloy electroplating solution adopts trivalent chromium to meet the requirements of environmental protection and greenness, the dispersion ability and deep plating ability of the electroplating solution are not enough, the hardness and corrosion resistance of the coating are not good, and the formula is relatively complicated

Method used

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  • Cr-Ni alloy electroplating liquid and electroplating method
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  • Cr-Ni alloy electroplating liquid and electroplating method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The formula of Cr-Ni alloy electroplating solution is as follows:

[0030] Table 1-1 Cr-Ni alloy electroplating solution

[0031]

[0032] Plating process conditions: the frequency of square wave pulse current is 100Hz, the duty cycle is 15%, and the average current density is 10A / dm 2 ; The pH is 2, the temperature is 30° C., and the time is 80 minutes.

Embodiment 2

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

[0035] Table 2-1 Cr-Ni alloy electroplating solution

[0036]

[0037] Plating process conditions: the frequency of square wave pulse current is 1000Hz, the duty cycle is 30%, and the average current density is 30A / dm 2 ; The pH is 4, the temperature is 60° C., and the time is 250 minutes.

Embodiment 3

[0039]The formula of Cr-Ni alloy electroplating solution is as follows:

[0040] Table 3-1 Cr-Ni alloy electroplating solution

[0041]

[0042] Plating process conditions: the frequency of square wave pulse current is 650Hz, the duty cycle is 25%, and the average current density is 20A / dm 2 ; The pH is 3, the temperature is 45° C., and the time is 160 minutes.

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Abstract

The invention discloses a Cr-Ni alloy electroplating liquid and an electroplating method. The Cr-Ni alloy electroplating liquid includes chromium chloride hexahydrate with the content of 90-120 g / L, nickel sulfate hexahydrate with the content of 25-50 g / L, ammonium bromide with the content of 50-70 g / L, citric acid with the content of 130-140 g / L, oxalic acid with the content of 35-50 g / L, an emulgator with the content of 0.3-0.5 g / L and the balance of solvent, wherein the solvent is a mixed liquid consisting of DMAC and water with the volume ratio of (0.9-1.2):1. According to the Cr-Ni alloy electroplating liquid provided by the invention, the mixed liquid consisting of DMAC and water is used as the solvent of the electroplating liquid, and citric acid and oxalic acid are used as a compound coordination agent, and are also used as a buffer agent for substituting boric acid, so that the formula is simplified, hardness and corrosion resistance of the coating are improved, and the scattering performance and deep plating performance of the electroplating liquid are improved.

Description

technical field [0001] The invention relates to the technical field of electroplating solutions, in particular to a Cr-Ni alloy electroplating solution and an electroplating method. Background technique [0002] Chromium coating has the advantages of high hardness, good wear resistance and strong corrosion resistance, and has been widely used as a wear-resistant and decorative coating in industry. However, chromium plating softens at higher temperatures. The hardness value begins to decrease at 300°C, and the coating is in a fully annealed state at 510°C; in addition, the chromium coating generally has a micro-crack structure (thickness greater than 0.7 microns). These microcrack structures may be filled by adsorbates, thereby reducing the coating's ability to protect the substrate. Replacing the single-metal chromium coating with Ni-Lu alloy can alleviate the above problems and make the coating have high temperature resistance and hardness. [0003] Chinese patent CN1014...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/18
Inventor 唐靖岚
Owner WUXI QINGYANG MACHINERY MFG
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