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Electroplating or chemical-plating pretreatment method of aluminum alloy and application of electroplating or chemical-plating pretreatment method

An aluminum alloy and chemical plating technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve problems such as peeling or peeling, prevent natural passivation, increase the bonding force of the coating, and have a rough surface. uniform effect

Active Publication Date: 2016-01-27
天津航空机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing aluminum alloy copper plating technology cannot prepare a qualified coating that not only meets the requirements of the bonding force test at room temperature, but also has a higher coating bonding force at high temperature, the purpose of the present invention is to provide an aluminum alloy electroplating or A pretreatment method for electroless plating and a copper plating method for aluminum alloys, the pretreatment method can improve the bonding condition when plating copper or other metals, and the method can be obtained through reasonable process flow, solution formula and process parameters Coatings with qualified bonding strength at normal temperature and high temperature, thermal shock test results show that aluminum alloy parts can withstand high temperature of 280 ° C for 3 minutes without blistering, peeling or falling off after copper plating by the method of the present invention, and can be applied to a large number of parts Electroplating, electroless plating process

Method used

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  • Electroplating or chemical-plating pretreatment method of aluminum alloy and application of electroplating or chemical-plating pretreatment method
  • Electroplating or chemical-plating pretreatment method of aluminum alloy and application of electroplating or chemical-plating pretreatment method

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Embodiment 1

[0075] A copper plating method for 3A21 aluminum alloy, its technical process, solution formula and process parameters are as follows:

[0076] The process flow structure includes, chemical sanding treatment-removal of hanging dust-primary galvanizing-secondary galvanizing-pre-nickel plating-copper plating

[0077] A kind of copper plating method of 3A21 aluminum alloy, its flow process is as follows:

[0078]Clean the oil stain on the surface of the parts processed by 3A21 aluminum alloy, and perform chemical sanding treatment. The contents of each component in the sanding solution are: sodium hydroxide 45g / L, sodium phosphate 55 / L, ammonium bifluoride 30g / L , ammonium chloride 10g / L, and the balance is water. The temperature of chemical sanding treatment is 55°C, and the time of chemical sanding treatment is 1min. At the same time, the surface state of aluminum alloy is adjusted to obtain parts with black surface; Nitric acid with a mass fraction of 60wt% until the black a...

Embodiment 2

[0082] A copper plating method for 3A21 aluminum alloy, its process flow, solution formula and process parameters are as follows:

[0083] The process flow structure includes, chemical sanding treatment-removal of hanging dust-primary galvanizing-secondary galvanizing-pre-nickel plating-copper plating

[0084] A kind of copper plating method of 3A21 aluminum alloy, its flow process is as follows:

[0085] Clean the oil stain on the surface of the parts processed by 3A21 aluminum alloy material, and carry out chemical sanding treatment. The content of each component in the sanding solution is: sodium hydroxide 40g / L, sodium phosphate 50 / L, ammonium bifluoride 40g / L , ammonium chloride 5g / L, and the balance is water. The temperature of the chemical sanding treatment is 30°C, the time of the chemical sanding treatment is 3 minutes, and the surface state of the aluminum alloy is adjusted at the same time to obtain parts with a black surface; the parts after sanding are immersed i...

Embodiment 3

[0089] A copper plating method for 3A21 aluminum alloy, its technical process, solution formula and process parameters are as follows:

[0090] The process flow structure includes, chemical sanding treatment-removal of hanging dust-primary galvanizing-secondary galvanizing-pre-nickel plating-copper plating

[0091] A kind of copper plating method of 3A21 aluminum alloy, its flow process is as follows:

[0092] Clean the oil stain on the surface of the parts processed by 3A21 aluminum alloy material, and carry out chemical sanding treatment. The content of each component in the sanding solution is: sodium hydroxide 75g / L, sodium phosphate 70 / L, ammonium bifluoride 20g / L , ammonium chloride 15g / L, and the balance is water. The temperature of chemical sanding treatment is 60°C, and the time of chemical sanding treatment is 0.5min. At the same time, the surface state of the aluminum alloy is adjusted to obtain parts with a black surface; The solution is nitric acid with a mass f...

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Abstract

The invention provides an electroplating or chemical-plating pretreatment method of aluminum alloy and a copper plating method of aluminum alloy. The pretreatment method which comprises the steps of chemical sand treatment, surface dust removal, primary zinc immersion, secondary zinc immersion and nickel preplating is adopted, a proper solution formula and proper technological parameters are selected, the binding force of a plating layer obtained later is increased, and it is ensured that the plating layer of copper or other metal is qualified after 280 DEG C welding. The pretreatment method is stable and suitable for cyaniding copper plating treatment of aluminum alloy materials and other kinds of electroplating and chemical-plating pretreatment of the aluminum alloy materials. A thermal shock experiment result shows that aluminum alloy parts can bear high temperature of 280 DEG C for 3 min without bubbling or peeling or falling off after being plated with copper through the method, and the pretreatment method can be applied to electroplating and chemical-plating processes of a large number of parts.

Description

technical field [0001] The invention belongs to aluminum alloy electroplating technology, and relates to an aluminum alloy electroplating or electroless plating pretreatment method and application thereof. Background technique [0002] Aluminum and aluminum alloys are one of the most widely used metals, which have the advantages of good electrical conductivity, fast heat transfer, light specific gravity, high strength, and easy forming. However, aluminum and aluminum alloys also have disadvantages such as low hardness, non-wear resistance, prone to intergranular corrosion, and difficult welding, which affect their application range and service life. After surface treatment, aluminum and its alloys can maximize their strengths and avoid weaknesses, prolong their service life and expand their application range, and endow them with protection, decoration and other uses. [0003] The surface treatment technology of aluminum alloy includes anodic oxidation, electroplating, elect...

Claims

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Application Information

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IPC IPC(8): C23G1/22C25D5/44C23C18/18
Inventor 徐涛涛王亮兵
Owner 天津航空机电有限公司
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