Preparation method of silver-coated aluminum powder

A technology of silver-coated aluminum and aluminum powder, which is applied in the direction of liquid chemical plating, coating, metal material coating technology, etc., and can solve problems such as cumbersome process, poor coating effect, and complicated treatment process
CN102248159AInactive Publication Date: 2011-11-23BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2011-11-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of silver-coated aluminum powder and belongs to the technical field of powder surface treatment. The preparation method comprises the steps of performing copper displacement plating and then performing silver displacement plating. In the step of performing copper displacement plating, fluoride serves as a complexing agent of aluminum ions, so that reaction of removing an oxide film from the surface of aluminum powder can be performed in a nearly neutral environment, dissolution of the aluminum powder is inhibited and deposition of the copper on the aluminum powder is promoted. In the step of performing silver displacement plating, ammonium sulfate solution serves as activating solution, potassium sodium tartrate serves as a complexing agent ofcopper, and a copper platting layer is removed by replacing silver by copper, so that the silver can be deposited on the aluminum powder. The final silver-coated aluminum powder does not contain interlayer copper and the aluminum powder is coated completely. The procedures of plating the interlayer copper and then plating the silver are adopted, so the difficulty of coating the silver on the aluminum powder is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of powder surface treatment, and relates to a method for coating silver on the surface of aluminum powder to obtain silver-coated aluminum powder. The prepared silver-coated aluminum powder has the characteristics of complete coating and good conductivity, and can be used as a conductive filler Conductive composite materials used in the electronics industry. Background technique

[0002] With the development of electronic technology, various digital and high-frequency electronic appliances bring a lot of convenience to our life, but also bring a lot of electromagnetic pollution. Therefore, the research on electromagnetic shielding materials has very important practical significance. Electromagnetic shielding rubber is a very important electromagnetic shielding material, which is mainly composed of rubber and conductive filler. As a conductive filler, pure silver has excellent conductivity and oxidation res...

Claims

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