Composite coating on surface of anti-alkali anti-corrosion aluminum alloy and technology

Abstract

The invention belongs to the technical field of processing of metal surfaces, and provides a composite coating on the surface of an anti-alkali anti-corrosion aluminum alloy and a technology. The composite coating comprises aluminum or an aluminum alloy matrix and an anode oxide film layer coated on the aluminum or the aluminum alloy matrix, wherein an organosilicon coating is coated outside the anode oxide film layer, and the organosilicon coating is a composite layer consisting of epoxy modified organic silicon resin and methyl methacrylate. The organosilicon coating is firmly coated on the surface on which anodic oxidation is performed through construction of a mixing method and a spraying method, soaking, diffusion and closing on oxide film holes and solidification at 180 DEG C for 20-25min after flash drying of the surface layer of the organosilicon coating, infiltration of corrosive substances or alkaline substances on the inner-layer oxide film and the aluminum matrix is insulated, an aluminum alloy product processed by the technology disclosed by the invention has a good anti-alkali property and a good anti-corrosion property, the high temperature resistant property can be improved to 180 DEG C, so that cracks do not exist, and performance standard requirements can be satisfied under the condition that original appearance requirements are not changed.

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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