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Aluminum alloy electroless nickel plating mixed metal activation method

A mixed metal and electroless nickel plating technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve problems such as environmental pollution, nickel layer peeling, nickel plating solution pollution, etc., to reduce production costs, good binding effect

Inactive Publication Date: 2019-08-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN104294243B discloses a nickel-plating method for aluminum tubes. This method adopts galvanization first and then a layer of copper plating. The copper plating solution used contains cyanide, which pollutes the environment to a certain extent and its process is complicated.
This will also cause a problem, the galvanized layer will pollute the nickel plating solution
Invention patent CN107541719A discloses a method for electroless nickel plating on the surface of an aluminum alloy, mainly through pretreatment of the aluminum base material and then putting it into the plating solution for nickel plating, but it does not explain any nickel plating on the aluminum alloy, only through a simple pre-treatment, it is likely to lead to poor nickel plating effect and incomplete plating
The main disadvantage of the secondary galvanizing process is that in a humid and corrosive environment, zinc is an anode relative to the nickel coating and will be subject to lateral corrosion, which will eventually cause the nickel layer to peel off
The pre-nickel plating method can overcome the shortcomings of secondary zinc dipping, but the complexing agent in this process and Ni 2+ The molar ratio and pH value are the key process factors, which need to be well controlled, and its activation degree and nickel plating stability are not high
The direct plating method is more difficult, similar to the pre-plating nickel method, and it is difficult to control the parameters
[0006] To sum up, although there are various methods to electroless nickel plating on the surface of aluminum alloy, various problems and cumbersome procedures will appear in the pretreatment process, which cannot meet the requirements of today's enterprises.

Method used

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  • Aluminum alloy electroless nickel plating mixed metal activation method
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Examples

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Embodiment 1

[0030] 1. Alkaline degreasing liquid components: 10g / L sodium hydroxide, 20g / L sodium carbonate, 5g / L sodium silicate, 10g / L sodium phosphate;

[0031] 2. Preparation of acid etching solution: Measure 10ml of hydrochloric acid, add it to 90ml of deionized water, and stir evenly to obtain acid etching solution;

[0032] 3. The components of the acidic mixed metal activation solution: 0.02g / L palladium chloride, 1ml / L concentrated hydrochloric acid, 0.02g / L ammonium chloride, 10g / L nickel chloride.

[0033] A method for activation of aluminum alloy electroless nickel plating mixed metals, said method comprising the steps of:

[0034] (1) The cutting area is 2×2cm 2 Put the aluminum substrate into the alkaline degreasing solution for alkaline degreasing for 5 minutes at a temperature of 70°C, and then fully wash with deionized water;

[0035] (2) Put the degreased substrate into the acid etching solution for 60s, the temperature is 25°C, and then fully wash it with deionized wa...

Embodiment 2

[0038] 1. Alkaline degreasing liquid components: 20g / L sodium hydroxide, 20g / L sodium carbonate, 5g / L sodium silicate, 20g / L sodium phosphate;

[0039] 2. Preparation of acid etching solution: Measure 30ml of hydrochloric acid, add it to 70ml of deionized water, and stir evenly to obtain acid etching solution;

[0040] 3. The components of the acidic mixed metal activation solution: 0.02g / L palladium chloride, 1ml / L concentrated hydrochloric acid, 0.03g / L ammonium chloride, 30g / L copper chloride.

[0041] A method for activation of aluminum alloy electroless nickel plating mixed metals, said method comprising the steps of:

[0042] (1) The cutting area is 2×2cm 2 Put the aluminum substrate into the alkaline degreasing solution for alkaline degreasing for 3 minutes at a temperature of 60°C, and then fully wash with deionized water;

[0043] (2) Put the degreased substrate into the acid etching solution for 15s, the temperature is 25°C, and then fully wash it with deionized wate...

Embodiment 3

[0046] 1. Alkaline degreasing liquid components: 10g / L sodium hydroxide, 20g / L sodium carbonate, 5g / L sodium silicate, 10g / L sodium phosphate;

[0047] 2. Preparation of acid etching solution: Measure 10ml of hydrochloric acid, add it to 90ml of deionized water, and stir evenly to obtain acid etching solution;

[0048] 3. Components of alkaline mixed metal activation solution: 0.05g / L silver sulfate, 0.03g / L ammonia water, 5g / L EDTA, 5g / L copper sulfate.

[0049] A method for activation of aluminum alloy electroless nickel plating mixed metals, said method comprising the steps of:

[0050] (1) The cutting area is 2×2cm 2 Put the aluminum base material into the alkaline degreasing solution for alkaline degreasing for 5 minutes at a temperature of 60°C, and then fully wash it with deionized water;

[0051] (2) Put the degreased substrate into the acid etching solution for 5s, the temperature is 25°C, and then fully wash it with deionized water;

[0052] (3) Put the acid-etche...

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Abstract

The invention provides an aluminum alloy electroless nickel plating mixed metal activation method. The method comprises the following steps that surface oil removal, deoxidizing film treatment and acid cleaning are performed on an aluminum base material in sequence, then the aluminum base material is placed in activation liquid for activation, the activation treatment temperature is 20-50 DEG C, and the activation time is 1-5 min. By means of the aluminum alloy electroless nickel plating mixed metal activation method provided by the invention, a prepared nickel plating layer has the characteristics of being uniform and compact, wear resistant, corrosion resistant, good in binding force and the like, the problems existing in the prior art of the tedious process, environmental pollution, slow beginning plating time, poor plating layer adhesion force and the like are solved, the production cost can further be reduced, and the aluminum alloy electroless nickel plating mixed metal activation method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to a method for activating an aluminum alloy electroless nickel plating mixed metal. Background technique [0002] Electroless plating refers to the process of reducing metal ions to metal atoms by releasing electrons through the catalytic reaction of the reducing agent in the solution without power supply. It can be plated regardless of the shape of the product, and can also be processed after a specific pretreatment process. Plating is performed on insulating objects, so it is used in various industrial fields. Electroless nickel plating is a process application in which an amorphous Ni-P alloy coating is deposited on a metal or non-metal surface by a chemical method. The nickel coating has excellent corrosion resistance and wear resistance, high hardness, and thickness Uniformity, better adhesion than electroplating and excellent surface finish, such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/32
CPCC23C18/1844C23C18/32
Inventor 王斌胡光辉潘湛昌
Owner GUANGDONG UNIV OF TECH
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