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Method of electroplating metal layer on surface of zinc pressure casting

A technology for electroplating metals and castings, which is applied to the field of electroplating metal layers on the surface of zinc die castings, and can solve the problems of component volatilization and high energy consumption

Inactive Publication Date: 2014-05-21
WUXI SANZHOU COLD ROLLED SILICON STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the volatilization of components in the high-temperature bath plating solution and the problems of large energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Work piece: ZA8 zinc alloy die casting

[0033] 1. Pretreatment

[0034] (1) mechanical polishing

[0035] The workpiece is mechanically polished with a 1*10-inch button cloth wheel combined with a 1*10-inch small wool wheel to remove the burrs and oxide scales on the surface of the workpiece during the die-casting process.

[0036] (2) wax removal

[0037] The above-mentioned polished workpiece was immersed in a universal dewaxing water (Procleaner BR#1 of Yongxing Chemical Co., Ltd.) with a concentration of 30 ml / liter, and dewaxed under ultrasonic waves for 5 minutes at a temperature of 70°C.

[0038] (3) Electrodegreasing

[0039] Immerse the above-mentioned workpiece after wax removal in the degreasing liquid, at a temperature of 50°C and 5A / dm 2 Electrolytic degreasing at a current density of 1 minute. The degreasing liquid is an aqueous solution containing 30 grams per liter of sodium phosphate and 30 grams per liter of sodium carbonate.

[0040] (4) acid e...

Embodiment 2

[0057] Work piece: ZA8 zinc alloy die casting

[0058] 1. Pretreatment

[0059] Pretreatment was performed according to the pretreatment method described in Example 1.

[0060] 2. Cyanide-free pre-plating copper

[0061] Immerse the above-mentioned pretreated workpiece in the electroplating solution of cyanide-free pre-plating copper, use copper as the anode and the workpiece as the cathode, at room temperature and current density of 2A / dm 2 Plating under the conditions of 2 minutes.

[0062] The electroplating solution contains 25 grams / liter of copper pyrophosphate, 220 grams / liter of sodium pyrophosphate, 0.8 grams / liter of disodium edetate, 1.2 grams / liter of sodium citrate, and 0.05 grams / liter of potassium sulfamate And potassium dithiocarbonate 0.01 gram / liter, 1 gram / liter ethyl thiourea, 5g / L castor oil sodium sulfonate, 5g / L benzimidazole, the pH of plating solution is 6.5.

[0063] 3. Surface decoration plating

[0064] Surface decorative plating was performed ...

Embodiment 3

[0066] Work piece: ZA8 zinc alloy die casting

[0067] 1. Pretreatment

[0068] Pretreatment was performed according to the pretreatment method described in Example 1.

[0069] 2. Cyanide-free pre-plating copper

[0070] Immerse the above-mentioned pretreated workpiece in the electroplating solution of cyanide-free pre-plating copper, use copper as the anode and the workpiece as the cathode, at room temperature and current density of 2A / dm 2 Plating under the conditions of 10 minutes.

[0071] Contain 15 grams / liter of copper pyrophosphate, 380 grams / liter of potassium pyrophosphate, 3 grams / liter of ethylenediaminetetraacetic acid, 7 grams / liter of potassium citrate, 0.6 grams / liter of potassium sulfamate and two Potassium thiocarbonate 0.15 g / L, 2 g / L ethyl thiourea, 10 g / L castor oil sodium sulfonate, 10 g / L benzimidazole, the pH of the plating solution is 7.5.

[0072] 3. Surface decoration plating

[0073] Surface decorative plating was performed as described in Exam...

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PUM

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Abstract

The invention provides a method of electroplating a metal layer on the surface of a zinc pressure casting. The method comprises the following steps: polishing; dewaxing; removing oil; acid-etching; pre-plating copper; electroplating the metal layer. An electroplating liquid of pre-plating copper contains 1-2g / L of ethyl thiourea, 5-10g / L of castor oil sodium sulfonate and 5-10g / L of benzimidazole serving as an additive, so that the binding force of the pre-plating copper layer provided by the invention and the zinc die cast alloy is good.

Description

technical field [0001] The invention relates to an electroplating method, in particular to a method for electroplating a metal layer on the surface of a zinc die casting. Background technique [0002] Zinc die-casting is a workpiece that often needs electroplating except steel parts, because zinc alloy is easy to die-cast into the required shape, and can be widely used in making lighting, locks, plumbing equipment, etc. Zinc die castings have low hardness and poor corrosion resistance, so they need electroplating protection, and small zinc die castings need barrel plating. [0003] Copper-nickel-chromium, copper-nickel-imitation gold or copper-multilayer nickel-chromium electroplating process is a very widely used electroplating combination process. In the past, the copper layer of the undercoating in these electroplating combined processes was obtained by cyanide electroplating process, which can prevent the displacement reaction between the plated workpiece and copper, th...

Claims

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Application Information

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IPC IPC(8): C25D3/38C25D5/34
Inventor 刘茂见
Owner WUXI SANZHOU COLD ROLLED SILICON STEEL