Aluminum material surface local gold plating process

A partial gold-plating and aluminum technology, which is applied in the field of gold plating, can solve the problems of poor bonding between aluminum and gold-plated layers, and the gold-plated layer is easy to fall off, etc.

Inactive Publication Date: 2020-12-25
深圳市海里表面技术处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the related aluminum partial gold plating process, considering that aluminum alloy is a difficult-to-plate metal, this is because aluminum has a strong electronegativity and a strong affinity for oxygen, and its surface is very easy to combine with oxygen to form an oxide film. This kind of oxide film has a relatively dense structure, which...

Method used

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  • Aluminum material surface local gold plating process
  • Aluminum material surface local gold plating process
  • Aluminum material surface local gold plating process

Examples

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Effect test

Embodiment 1

[0055] A partial gold plating process on the surface of an aluminum material is obtained by performing the following steps in sequence:

[0056] A. Surface treatment: Put degreasing powder in the ultrasonic tank, put the aluminum material in the ultrasonic tank to degrease for 0.5min and then wash it with water, and then place the aluminum material in a sodium hydroxide solution with a concentration of 120g / L at 35°C After reacting for 2 minutes in the medium, wash with water, and finally place the aluminum material in the descaling solution for 2 minutes and then wash it with water. The percentage concentration is 10%, the volume percent concentration of nitric acid in the descaling solution is 30%, the volume percent concentration of phosphoric acid in the descaling solution is 40%, and the concentration of the activated salt in the descaling solution is 40g / L.

[0057] B. Zinc dipping: immerse the aluminum material after the surface treatment in step A in the first zinc dip...

Embodiment 2

[0063] A partial gold plating process on the surface of an aluminum material, the difference from Example 1 is that step A specifically includes: putting degreasing powder in an ultrasonic tank, putting the aluminum material in the ultrasonic tank for degreasing for 0.5 min, and then washing the aluminum material with water. Put it in a nitric acid solution with a concentration of 40% by volume to react for 9 minutes, then place the aluminum material in a sodium hydroxide solution with a concentration of 120g / L at 35°C for 2 minutes, wash it with water, and finally put the aluminum material in a descaling After reacting in the solution for 2 minutes, wash with water, wherein the descaling solution is the same as in Example 1.

Embodiment 3

[0065] A partial gold-plating process on the surface of an aluminum material, the difference from Example 2 is that step B specifically includes: immersing the aluminum material after the surface treatment in step A into the first zinc dipping solution, washing it with water after reacting for 30 seconds, and then immersing the aluminum material in the annealing solution. Rinse with water after reacting in the zinc solution for 15s, and finally immerse the aluminum material in the second zinc dipping solution and react for 15s before washing with water. Wherein the first zinc dipping solution and the second zinc dipping solution are mixed solutions containing 50% zinc oxide, 40g / L sodium hydroxide and 6g / L potassium cyanide, and the zinc stripping solution is nitric acid with a concentration of 40% by volume solution.

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Abstract

The invention relates to the field of gold plating technologies, in particular to an aluminum material surface local gold plating process. The process comprises the following steps of removing impurities on the surface of an aluminum material; immersing the aluminum material treated in the step A into a zinc dipping solution, reacting until a zinc coating is formed on the surface of the aluminum material, and performing washing with water; immersing the aluminum material subjected to zinc immersion in the step B into a nickel plating solution, reacting until a nickel plating layer is formed onthe surface of the aluminum material, and performing washing with water; immersing the aluminum material subjected to nickel plating in the step C into a gold plating solution, reacting until a goldplating layer is formed on the surface of the aluminum material, performing washing with water, and performing drying; dividing the surface of the aluminum material plated with gold in the step D intoa gold plating area and a non-gold plating area, and wrapping the surface of the gold plating area with a layer of shielding material; and immersing the aluminum material subjected to local shieldinginto a gold stripping mixed solution, reacting until the gold plating layer of the non-gold-plating area of the aluminum material disappears, performing washing with water after the nickel plating layer is completely exposed, and performing drying to obtain a local gold-plating plated part. The process has the effect of improving the binding force between the plating layer and the plated part.

Description

technical field [0001] The present application relates to the field of gold plating technology, in particular to a partial gold plating process on the surface of an aluminum material. Background technique [0002] With the rapid development of science and technology, aluminum products are more and more widely used in aerospace, automobile, instrumentation and electronics industries. Since aluminum is a relatively active metal, its application usually requires surface functionalization. Among them, electroplating is one of the important means of surface treatment of aluminum materials, which is to use electrochemical methods to treat or modify the surface of aluminum materials. . Because the gold-plated layer has strong corrosion resistance, good electrical conductivity, high temperature resistance and easy welding, the gold-plated layer on aluminum is widely used. However, gold is a relatively expensive metal. In actual production, in order to reduce costs, most of them u...

Claims

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Application Information

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IPC IPC(8): C23C28/02C23C18/31C23C18/36C25D3/48C25D3/12C23F1/02
CPCC23C18/31C23C18/36C23C28/025C23F1/02C25D3/12C25D3/48
Inventor 张宇於杨强肖登华廖孟良汪朝晖
Owner 深圳市海里表面技术处理有限公司
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