Non-cyanide pre-plating copper plating solution

An electroplating solution and divalent copper technology, applied in the field of cyanide-free copper pre-plating electroplating solution, can solve the problems of poor bonding between the pre-plating layer and the substrate, achieve a smooth and bright appearance, avoid volatilization and high energy consumption, and withstand Good temperature shock performance and high temperature baking performance

Inactive Publication Date: 2010-02-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to overcome the defect that the binding force between the obtained pre-plated layer and the base material obtained by pre-plating zinc, aluminum, magnesium or their alloys is relatively poor in the method of the above-mentioned prior art, and to provide a method that can make zinc, aluminum , magnesium or their alloys to obtain a cyanide-free pre-plating copper plating solution with a better bonding force with the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Work piece: ZA8 zinc alloy die casting

[0032] 1. Pretreatment

[0033] (1) mechanical polishing

[0034] 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.

[0035] (2) wax removal

[0036] The above-mentioned polished workpiece was immersed in a universal dewaxing water (Procleaner BR#1 from 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.

[0037] (3) Electrodegreasing

[0038] 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.

[0039] (4) acid...

Embodiment 2

[0056] Work piece: ZA8 zinc alloy die casting

[0057] 1. Pretreatment

[0058] Pretreatment was performed according to the pretreatment method described in Example 1.

[0059] 2. Cyanide-free pre-plating copper

[0060] 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.

[0061] 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 per liter, the pH of this plating solution measured is 6.5, and the specific gravity is 1.2302 gram per centimeter 3 .

[0062] 3. Surface decoration plating

[0063] Surface decorative plating was performed as de...

Embodiment 3

[0065] Work piece: ZA8 zinc alloy die casting

[0066] 1. Pretreatment

[0067] Pretreatment was performed according to the pretreatment method described in Example 1.

[0068] 2. Cyanide-free pre-plating copper

[0069] 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.

[0070] 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 grams per liter, the pH of this plating solution recorded is 7.5, and specific gravity is 1.2625 grams per centimeter 3 .

[0071] 3. Surface decoration plating

[0072] Surface decorative plating was performed as described in Examp...

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Abstract

The invention provides a non-cyanide pre-plating copper plating solution, which is an aqueous solution containing a bivalent cupric salt and a complexing agent, wherein the plating solution also contains an auxiliary agent which comprises at least two of an alkali metal salt of sulfamidic acid, an alkali metal salt of dithiocarbonic acid, an alkali metal salt of allyl sulphonic acid, allyl sulfonamide, an alkali metal salt of vinyl sulphonic acid and saccharin; and the pH value of the plating solution is between 6.5 and 7.5. According to the non-cyanide pre-plating copper plating solution, thebonding force between a pre-plating copper layer prepared from the non-cyanide pre-plating copper plating solution and a base material is good, and simultaneously a plated product has a smooth and bright appearance and good temperature impact resistance and high-temperature baking resistance.

Description

technical field [0001] The invention relates to a cyanide-free copper pre-plating electroplating solution. Background technique [0002] 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, thereby affecting the bonding force between the plating layer and the substrate. The plating layer obtained by using the pre-plating copper electroplating solution containing cyanide is fine and has good bonding force, and the plating solution has good throwing property, leveling and stability. [0003] However, cyanide is a highly toxic chemical, and its lethal dose to humans is only 0.005g. Cyanide not only endangers the health of the operator, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/38
Inventor 李爱华彭波罗鹏李娟
Owner BYD CO LTD
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