Nickel plating process for surface of aluminum alloy

A technology of aluminum alloy surface and nickel plating, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problems of poor wear resistance, difficulty, negative electrode potential, etc., and improve the flatness and smoothness of the coating The effect of preventing small sand holes from missing plating and preventing the coating from falling off

Active Publication Date: 2020-06-26
SHENZHEN XINMAOXIN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, aluminum alloy has low hardness and poor wear resistance, and the surface hardness and wear resistance can be greatly improved after electroless nickel plating.
Plating on aluminum alloys is much more difficult and complicated than plating on metal materials such as steel and copper. Due to its lively nature, the surface easily reacts with oxygen in the air to form an oxide film. The existence of this oxide film hinders At the same time, the electrode potential of aluminum is very negative, and it can undergo substitution reactions with various metal ions when immersed in the plating solution, forming a contact coating on the aluminum, reducing the bonding strength between the coating and the aluminum substrate
At present, the pretreatment process of aluminum alloy electroless plating is relatively complicated. Generally, copper or nickel flash plating is used after immersion in zinc or tin. The process is relatively long, and there are many parameters that need to be controlled in the process.

Method used

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  • Nickel plating process for surface of aluminum alloy
  • Nickel plating process for surface of aluminum alloy
  • Nickel plating process for surface of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1 of the present invention provides a kind of aluminum alloy workpiece that contains nickel-plated layer, and the plating process of described nickel-plating solution on aluminum alloy surface comprises the following steps successively:

[0069] (1) Degreasing: place the aluminum alloy workpiece in a degreasing tank containing an alkaline reagent and treat it at 50-55° C. for 8 minutes; wherein the alkaline reagent is an aqueous solution of sodium hydroxide; the concentration of sodium hydroxide is 50 wt %;

[0070] (2) Desiliconization: continue to place the aluminum alloy workpiece obtained in step (1) in a desiliconization tank containing a strong oxidizing agent at 25 to 30°C for 60 seconds; the strong oxidizing agent is a hydrogen peroxide aqueous solution, and the concentration of hydrogen peroxide is 65mL / L;

[0071] (3) Deposit zinc and nickel for the first time: soak the aluminum alloy workpiece obtained in step (2) in the mixed aqueous solution contai...

Embodiment 2

[0083] Embodiment 2 of the present invention provides a kind of aluminum alloy workpiece that contains nickel-plated layer, and the plating process of described nickel-plating solution on aluminum alloy surface comprises the following steps successively:

[0084] (1) Degreasing: place the aluminum alloy workpiece in a degreasing tank containing an alkaline reagent at 50-55° C. for 8 minutes; wherein the alkaline reagent is an aqueous solution of sodium hydroxide; the concentration of sodium hydroxide is 75 wt %;

[0085] (2) Desiliconization: continue to place the aluminum alloy workpiece obtained in step (1) in a desiliconization tank containing a strong oxidizing agent at 25 to 30°C for 60 seconds; the strong oxidizing agent is a hydrogen peroxide aqueous solution, and the concentration of hydrogen peroxide is 65mL / L;

[0086] (3) Deposit zinc and nickel for the first time: soak the aluminum alloy workpiece obtained in step (2) in the mixed aqueous solution containing nickel...

Embodiment 3

[0098] Embodiment 3 of the present invention provides a kind of aluminum alloy workpiece that contains nickel-plated layer, and the plating process of described nickel-plating solution on aluminum alloy surface comprises the following steps successively:

[0099] (1) Degreasing: place the aluminum alloy workpiece in a degreasing tank containing an alkaline reagent at 50-55° C. for 8 minutes; wherein the alkaline reagent is an aqueous solution of sodium hydroxide; the concentration of sodium hydroxide is 65 wt %;

[0100] (2) Desiliconization: continue to place the aluminum alloy workpiece obtained in step (1) in a desiliconization tank containing a strong oxidizing agent at 25 to 30°C for 60 seconds; the strong oxidizing agent is a hydrogen peroxide aqueous solution, and the concentration of hydrogen peroxide is 65mL / L;

[0101] (3) Deposit zinc and nickel for the first time: soak the aluminum alloy workpiece obtained in step (2) in the mixed aqueous solution containing nickel...

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Abstract

The invention relates to the relevant field of nickel plating methods, in particular to a nickel plating process for a surface of an aluminum alloy. In the first aspect, the nickel plating process forthe surface of the aluminum alloy is provided, and sequentially comprises the steps: oil removal, silicon removal, first-time deposition of zinc and nickel, second-time deposition of the zinc and thenickel, alkaline nickel plating, acid nickel plating, hole sealing and drying. Through the method that the zinc and the nickel are deposited twice, then alkaline and acid nickel plating is conducted,and finally hole sealing and drying are conducted, nickel plating is conducted on the surface of the aluminum alloy, in the process of the plating process, binding force between a plated layer and analuminum material is increased, the good protection effect on zinc-nickel plating is achieved, an adopted reagent is prevented from corroding the plated layer, meanwhile skip plating of fine sand holes can be prevented, plated layers of local positions can also be prevented from falling off, then the magnetic conductivity is reduced through a specific acid nickel plating solution, and the flatness and smoothness of the plated layer are improved.

Description

technical field [0001] The invention relates to the related field of nickel plating methods, and more specifically, the invention provides a nickel plating process on the surface of an aluminum alloy. Background technique [0002] Aluminum alloy has low density, good corrosion resistance, high fatigue resistance, relatively large specific strength and specific stiffness, which is equivalent to structural steel or even ultra-high-strength steel, and is widely used in the preparation of mobile phone components to lighten the structure of mobile phones. weight. [0003] However, aluminum alloy has low hardness and poor wear resistance, and the surface hardness and wear resistance can be greatly improved after electroless nickel plating. Plating on aluminum alloys is much more difficult and complicated than plating on metal materials such as steel and copper. Due to its lively nature, the surface easily reacts with oxygen in the air to form an oxide film. The existence of this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/50C23C18/18
CPCC23C18/36C23C18/50C23C18/1844C23C18/1689
Inventor 王小锋刘秋华
Owner SHENZHEN XINMAOXIN IND CO LTD
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