Aluminum alloy spraying pretreatment method

Abstract

A pretreatment method for aluminum alloy spraying, comprising the following steps: degreasing the aluminum alloy; performing alkali bite treatment on the degreased aluminum alloy; performing sanding treatment on the aluminum alloy that has been subjected to the alkali bite treatment; Neutralize the aluminum alloy that has been neutralized; perform anodic oxidation on the neutralized aluminum alloy; perform pore-forming treatment on the anodized aluminum alloy; Hole-treated aluminum alloys are subjected to hole-running treatment. The above-mentioned aluminum alloy spraying pretreatment method can prepare micron on the aluminum alloy surface by sequentially performing degreasing treatment, alkali biting treatment, sanding treatment, neutralization treatment, anodic oxidation treatment, pore forming treatment, pore expansion treatment and pore moistening treatment. ‑Nano multi-level porous structure facilitates the adhesion of paint resin, can improve the bonding strength between aluminum alloy and paint, the paint has good adhesion, and the paint is not easy to fall off.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy surface treatment, in particular to a pretreatment method for aluminum alloy spraying. Background technique [0002] With the continuous development of science and technology, the requirements for various properties of materials are getting higher and higher. Therefore, combining the properties of various materials together to obtain new materials beyond a single material itself has become a hot research topic today. Among them, the spraying technology of spray forming aluminum alloy and paint, first roughening the surface of the aluminum alloy, then spraying the paint on the surface of the aluminum alloy, and forming a film layer on the surface of the aluminum alloy to improve the oxidation resistance of the aluminum alloy, Corrosion resistance or the purpose of changing color. The composite of aluminum alloy and paint formed by spray molding of aluminum alloy and paint can not only take ...

AI Technical Summary

Problems solved by technology

However, when the passivation process is adopted, the passivation film formed by the passivation process has good film density and coverage during passivation, and its bonding strength with the coating is still poor; physical or chemical sandblasting is used for aluminum alloys. At the same time, the specific surface improvement of the aluminum alloy surface is limited, and the bonding strength is still poor. At the same time, physical sanding is difficult to clean, and there is a problem of covering the aluminum alloy surface, which affects the combination of aluminum alloy and paint.

Furthermore, the problem of paint falling is still prone to occur in the composite body of aluminum alloy and paint prepared after passivation or sandblasting

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