Chemical plating method for improving surface hardness of aluminum alloy

By plating doped particles-Ni-Cu-P composite plating on the surface of the aluminum alloy, the problems of low hardness and poor wear resistance of the aluminum alloy are solved, which significantly improves its corrosion resistance and wear resistance and reduces maintenance costs.

CN119663255AInactive Publication Date: 2025-03-21JIANGXI YIXIN NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202411777107.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-03-21
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The low hardness and poor wear resistance of aluminum alloys limit their application in industrial production.

Method used

An electroless plating method is adopted to coat a layer of doped particles-Ni-Cu-P composite plating layer on the surface of the aluminum alloy. The method includes plating an aqueous solution of aluminum nitrate in the reactor, adding urea and zirconium oxide nitrate, preparing the nanopowder solid phase through stirring, heating and calcining, and then soaking in hydrogen peroxide and dispersing ultrasonic stirring to form plating solution doped particles. Then, the aluminum alloy plate is picked up in a composite aqueous solution of nitric acid and phosphoric acid, and then treated in a specially prepared mother liquor and ethylenediamine ethanol solution to improve surface adsorption. Finally, plating is applied in the plating solution to form a dense plating layer.

Benefits of technology

It significantly improves the corrosion resistance and wear resistance of aluminum alloys, improves durability, and reduces maintenance costs. The self-corrosion potential of the surface of the aluminum alloy after plating is obviously positively shifted, and the Vickers hardness is significantly improved.

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Abstract

The invention discloses a chemical plating method for improving the surface hardness of an aluminum alloy. The chemical plating method comprises the following preparation steps: (1) preparing a nano powder solid phase; (2) preparing plating solution doped particles; (3) pickling to obtain a pickled aluminum alloy plate; (4) modifying to obtain an aluminum alloy plate surface; (5) a plating solution is prepared, the plating solution comprises doped particles, thiourea, nickel sulfate, copper sulfate, sodium hypophosphite, ammonium acetate, trisodium citrate and lauryl sodium sulfate, and a solvent is water; and plating to obtain the aluminum alloy with high surface hardness. According to the process, the surface of the aluminum alloy is plated with a layer of doped particle-Ni-Cu-P composite coating, the corrosion resistance and the wear resistance of the aluminum alloy are remarkably improved through the coating, the durability is improved, and the maintenance cost is reduced.
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