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Aluminum alloy cyanide-free and nickel-free electroplating method and electroplating products thereof

An aluminum alloy and nickel electroplating technology, applied in the plating of superimposed layers, metal material coating process, transportation and packaging, etc., can solve the problems of pollution, poor adhesion, and many pitting, and reduce allergies and adhesion. High, the effect of high corrosion resistance of the coating

Active Publication Date: 2010-07-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problems of many pitting, poor binding force and serious pollution in the existing electroplating aluminum or aluminum alloy process, thereby providing an aluminum alloy electroplating method with less pitting, strong binding force, no cyanide and nickel, and its electroplating product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The base material is AC8A aluminum alloy material, the specific operation steps are as follows:

[0030] 1. Mechanical polishing

[0031] Pretreatment of aluminum alloy materials: according to the requirements, mechanically polish the samples. Generally, the polishing method is carried out with a button cloth wheel combined with a small wool wheel to remove the burrs and scales produced by the raw material itself during the die-casting process, reduce the surface roughness, and improve the quality of the surface. Mirror bright effect and enhanced subsequent treatment or electroplating after sandblasting.

[0032] 2. Ultrasonic wax removal

[0033] Use Procleaner BR1 model wax removal water from Yongxing Chemical Company, the concentration of the tank is 30ml / L; the temperature is 65°C, and the time is 5min.

[0034] 3. Cathodic electrolytic degreasing

[0035] Use the 630 type electrolytic degreasing powder of International Chemical Co., Ltd., the opening volume is 5...

Embodiment 2

[0058] The base material is YL177 aluminum alloy material, the specific operation steps are as follows:

[0059] Steps 1-6 are the same as in Example 1.

[0060] 7. Galvanizing

[0061] The zinc dipping solution is: zinc oxide 40g / l, sodium hydroxide 125g / l, potassium sodium tartrate 50g / l, ferric chloride 1.5g / l, sodium nitrite 2g / l, dipping at a temperature of 23°C Zinc 45s.

[0062] 8. Plating cyanide-free alkali copper

[0063] The CuMac Strike XD7453 plating solution used by MacDermid is CuMac Strike Makeup solution 150ml / l, Equivalent copper meta 5.5g / l, CuMac Strike Stabilizer 65ml / l, and CuMac Strike Buffer 50ml / l. At a temperature of 60°C, the cathode current density is 1A / dm 2 , cyanide-free alkali copper electroplating for 2 minutes under the condition of pH value 9.5.

[0064] 9. Acid copper plating

[0065] Using Atotech's Ultra acid copper plating solution, the plating solution is: CuSO 4 .5H 2 O 220g / L, H 2 SO 4 50g / L, chloride ion 100mg / L, tank opener...

Embodiment 3

[0096] The base material is ZL102 aluminum alloy material, and the specific operation steps are as follows:

[0097] Steps 1-6 are the same as in Example 1.

[0098] 7. Galvanizing

[0099] The zinc dipping solution is: zinc oxide 60g / l, sodium hydroxide 130g / l, potassium sodium tartrate 60g / l, ferric chloride 1.5g / l, sodium nitrite 3.5g / l, at a temperature of 20°C Dip zinc for 2min.

[0100] 8. Plating cyanide-free alkali copper

[0101] The CuMac Strike XD7453 plating solution used by MacDermid is CuMac Strike Makeup solution 200ml / l, Equivalent copper meta 7.5g / l, CuMac Strike Stabilizer70ml / l, CuMac Strike Buffer80ml / l. At a temperature of 35°C, the cathode current density is 1A / dm 2 , cyanide-free alkali copper electroplating for 5 minutes under the condition of pH value 9.5.

[0102] 9. Acid copper plating

[0103] Using Atotech's Ultra acid copper plating solution, the plating solution is: CuSO 4 .5H 2 O 225g / L, H 2 SO 4 55g / L, chloride ion 100mg / L, tank opene...

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PUM

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Abstract

The invention provides an aluminum alloy cyanide-free and nickel-free electroplating method, the method includes that matrix material is sequentially dipped with zinc, then is electroplated with non-cyanide alkaline copper, acid copper, white copper tin and is electroplated with trivalent chromium. The invention also provides the products which are prepared by using the method of the invention. The coating of the electroplating products which are obtained by using the electroplating method of the invention has no pockmark, the bonding force is high, the corrosion resistance of the coating is high, and the surface of plating article is level and attractive. The method of the invention uses the non-cyanide alkaline copper to precoat and prime, then performs the acid copper electroplating, meanwhile the non-cyanide white copper tin system replaces the common nickel plating process, thereby the nickel allergy of human body is decreased, at last the trivalent white chromium electroplating is implemented. The application range of the preparation method is wide, and is applicable to various aluminum alloy materials, the process is environmental friendly and has no pollution, and is nontoxic and harmless.

Description

Technical field: [0001] The invention relates to a cyanide-free and nickel-free electroplating method for an aluminum alloy and an electroplating product thereof. Background technique: [0002] Aluminum and its alloys are widely used in modern aviation, aerospace, electric power, electronics, petroleum, chemical industry, building materials, transportation, light industry and In industries such as national defense, it has been widely used, and it is constantly expanding new research fields. However, as a typical amphoteric metal, aluminum is prone to corrosion in acidic and alkaline environments, so its application is greatly limited. In addition, aluminum alloy has the disadvantages of low surface hardness and poor wear resistance. Surface treatment is usually required to improve and overcome these shortcomings. At present, the treatment of aluminum alloys at home and abroad can be mainly summarized into four technical approaches: oxidation treatment, electroplating, pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/44C25D5/30C25D3/06
CPCC25D3/06C23C28/021C23C28/025C25D5/12C25D3/38C25D3/58C23C28/023C25D5/611C25D5/627Y10T428/12736
Inventor 孙继鹏彭波李爱华李再春
Owner BYD CO LTD
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