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A kind of aluminum alloy surface nickel plating process

A technology of aluminum alloy surface and aluminum alloy, 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: 2022-08-05
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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  • A kind of aluminum alloy surface nickel plating process
  • A kind of aluminum alloy surface nickel plating process
  • A kind of aluminum alloy surface nickel plating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1 of the present invention provides an aluminum alloy workpiece containing a nickel-plated layer, and the plating process of the nickel-plating solution on the surface of the aluminum alloy sequentially includes the following steps:

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

[0070] (2) Desiliconization: the aluminum alloy workpiece obtained in step (1) is then placed in a desiliconization tank containing a strong oxidant for 60s at 25-30°C; the strong oxidant is an aqueous hydrogen peroxide solution, and the concentration of hydrogen peroxide is 65mL / L;

[0071] (3) The first deposition of zinc and nickel: the aluminum alloy workpiece obtained in step (2) is immersed in a mixed aqueous solution containing nickel ions for the first deposition of zinc and nic...

Embodiment 2

[0083] Embodiment 2 of the present invention provides an aluminum alloy workpiece containing a nickel-plated layer, and the plating process of the nickel-plating solution on the surface of the aluminum alloy sequentially includes the following steps:

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

[0085] (2) Desiliconization: the aluminum alloy workpiece obtained in step (1) is then placed in a desiliconization tank containing a strong oxidant for 60s at 25-30°C; the strong oxidant is an aqueous hydrogen peroxide solution, and the concentration of hydrogen peroxide is 65mL / L;

[0086] (3) The first deposition of zinc and nickel: the aluminum alloy workpiece obtained in step (2) is immersed in a mixed aqueous solution containing nickel ions for the first deposition of zinc a...

Embodiment 3

[0098] Embodiment 3 of the present invention provides an aluminum alloy workpiece containing a nickel-plated layer, and the plating process of the nickel-plating solution on the surface of the aluminum alloy sequentially includes the following steps:

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

[0100] (2) Desiliconization: the aluminum alloy workpiece obtained in step (1) is then placed in a desiliconization tank containing a strong oxidant for 60s at 25-30°C; the strong oxidant is an aqueous hydrogen peroxide solution, and the concentration of hydrogen peroxide is 65mL / L;

[0101] (3) The first deposition of zinc and nickel: the aluminum alloy workpiece obtained in step (2) is immersed in a mixed aqueous solution containing nickel ions for the first deposition of zinc a...

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Abstract

The present invention relates to the related field of nickel plating methods, and more particularly, the present invention provides a nickel plating process on the surface of an aluminum alloy. A first aspect of the present invention provides a nickel plating process on the surface of an aluminum alloy, which sequentially includes the steps of: oil removal, silicon removal, first zinc-nickel deposition, second zinc-nickel deposition, alkaline nickel plating, acid nickel plating, Sealing and drying. The present invention adopts the method of twice immersing zinc nickel, then performing alkaline acid nickel plating, and finally performing sealing and drying to realize the nickel plating on the surface of the aluminum alloy. The bonding force has a good protective effect on zinc-nickel plating. The reagents used in placement can cause corrosion to the plating layer. At the same time, it can prevent small sand holes from leaking plating, and can also prevent local plating from falling off. The specific acid nickel plating solution is used to reduce the magnetic field. Conductivity, improve the flatness and smoothness of the coating.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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