Light-weight aluminum alloy die casting surface treatment method

Abstract

The invention discloses a light-weight aluminum alloy die casting surface treatment method, and belongs to the technical field of aluminum alloy die casting. A plurality of evenly-distributed repairing capsules are pre-embedded in a preservative layer of an interlayer; then a chemical foaming reaction is triggered in a forming process; bubbles are formed in the preservative and decomposed in the heating process to generate a large amount of gas, so that a continuous porous structure is formed; meanwhile, the repairing capsules serve as aggregate to support and reinforce the porous structure; meanwhile, the strength and shock resistance of the preservative layer are improved; and after the surface of a aluminum alloy die casting is damaged, under the porous structure characteristic of the preservative layer, external air makes contact with the repairing capsules; then the repairing capsules replace the aluminum alloy die casting to generate an oxidation reaction; heat is generated to trigger a healing action; damage to the surface of the aluminum alloy die casting is repaired; direct contact with the external environment is avoided; and therefore, the anti-corrosion performance of the aluminum alloy die casting is guaranteed.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy die-casting, and more specifically relates to a method for surface treatment of a lightweight aluminum alloy die-casting. Background technique [0002] Die-casting is a kind of pressure-casting part. It uses a pressure-casting mechanical die-casting machine equipped with a casting mold to pour liquid copper, zinc, aluminum or aluminum alloy into the feed port of the die-casting machine, and passes through the die-casting machine. Die casting, casting copper, zinc, aluminum parts or aluminum alloy parts of the shape and size limited by the mold, such parts are usually called die castings. Die-casting parts have different names in different places, such as die-casting parts, pressure castings, die-casting parts, die-casting aluminum, die-casting zinc parts, die-casting copper parts, copper die-casting parts, zinc die-casting parts, aluminum die-casting parts aluminum die-casting parts, alumin...

AI Technical Summary

Problems solved by technology

[0004] However, aluminum alloy die castings have inherent or unavoidable casting defects, such as easy to produce pores, sand holes, etc., which will damage the surface quality of die castings, resulting in low yield, which is not conducive to its subsequent processing. Therefore, aluminum alloys need to be processed Some surface treatment of die castings, the oxide film produced by the surface treatment of aluminum and its alloys has decorative effects, protective properties and special functions, which can improve the electrical conductivity, heat conduction, wear resistance, corrosion resistance and optical properties of aluminum and its alloys, etc.

[0005] However, aluminum alloy die castings will inevitably have scratches or wear and other damage during daily use. After the surface is damaged, it will lead to cracks in the oxide film and protective coating, resulting in significant corrosion resistance of aluminum alloy die castings. reduced, easily oxidized by oxygen in the air

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