A method for preparing a strong-bonding, corrosion-resistant, and wear-resistant composite film for magnesium alloy wheels

Abstract

This invention belongs to the field of metal surface treatment technology, specifically relating to a method for preparing a corrosion-resistant and wear-resistant composite film with strong adhesion on a magnesium alloy wheel substrate. It is applicable to the surface protection of lightweight automotive components. The method involves using an AZ91D magnesium alloy wheel, pre-treating it with a weakly alkaline composite electrolyte, and preparing a MAO coating using micro-arc oxidation. The MAO-coated magnesium alloy wheel is then immersed in a composite sol and gelled for 1-2 hours in an environment with 60%-80% humidity to form a semi-solidified transparent gel film. Subsequently, it is dried in an oven at 60-80℃ for 1 hour, and finally heated to 150-400℃ and held for 1.5 hours to complete the curing. Following this, a diamond thin film is deposited using MPCVD vapor deposition. This invention solves the core pain points of magnesium alloys being easily worn and corroded, achieving ultra-hard protection.

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