Alkali-resistant and corrosion-resistant aluminum alloy surface composite coating and its process

Abstract

The invention belongs to the technical field of metal surface treatment, and provides an alkali-resistant and corrosion-resistant aluminum alloy surface composite coating and its process, including an aluminum or aluminum alloy substrate and an anodized film layer attached to the aluminum or aluminum alloy substrate, an anodized film There is an organosilane coating attached to the outside of the layer. The organosilane coating is a composite layer composed of epoxy-modified silicone resin and methyl methacrylate. After the surface layer is flash-dried, it is cured at 180°C for 20-25 minutes, and it is firmly attached to the anodized surface, blocking the penetration of corrosive or alkaline substances into the inner oxide film and aluminum matrix. The aluminum treated by this process Alloy products have strong alkali resistance and corrosion resistance, high temperature resistance can be increased to 180 ° C without cracking, and can meet the performance standards of car manufacturers without changing the original appearance requirements.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to an alkali-resistant and corrosion-resistant aluminum alloy surface composite coating and a process. Background technique [0002] At present, the interior and exterior areas of many cars are equipped with decorative parts made of aluminum plates or aluminum profiles that show the true color of the metal. The surface protection is mainly to form a layer of porous aluminum oxide film on the surface of aluminum or aluminum alloy through anodic oxidation. It is achieved by sealing the pores of the membrane layer by a certain chemical method. However, in order to maintain the durability of the decoration, the current car manufacturers have higher and higher requirements for the corrosion resistance of the surface protection layer of aluminum alloy parts, especially the widespread use of strong alkaline car washes, because this traditional anode Oxidation coatings are di...

AI Technical Summary

Problems solved by technology

However, in order to maintain the durability of the decoration, the current car manufacturers have higher and higher requirements for the corrosion resistance of the surface protection layer of aluminum alloy parts, especially the widespread use of strong alkaline car washes, because this traditional anode Oxidation coatings are difficult to resist the erosion of strong alkaline (pH value > 13) solutions, which will cause the parts to lose light and color. Performance and competitiveness of related auto parts products in the market research and development of this process

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