Aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution for ship and preparation method of conversion film

Abstract

The invention relates to the field of aluminum alloy decoration and protection coatings for ships, in particular to an aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution for a ship and application of the aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution to a chemical conversion film. The chemical conversion solution contains titanium salts, zirconium salts, a silicon compound, an accelerator, a surfactant and the balance water, wherein the concentration of the titanium salts in the chromium-free chemical conversion solution ranges from 0.02 to 10g / L; the concentration of the zirconium salts in the chromium-free chemical conversion solution ranges from 0.1-10 g / L; the concentration of thesilicon compound in the chromium-free chemical conversion solution ranges from 2 to 25g / L; the concentration of the accelerator in the chromium-free chemical conversion solution ranges from 0.5-12 g / L; and the concentration of the surfactant in the chemical conversion solution ranges 0.1 to 10g / L. Chemical conversion films are formed on the surfaces of 5xxx or 6xxx series aluminum alloys by adopting an impregnating, brush coating, roller coating or spraying mode; and the chemical conversion films have favorable corrosion resistance, scratch resistance and fingerprint resistance and can be used as the surface decoration and protection coating of the aluminum alloy for the ship.

Description

technical field [0001] The invention relates to the field of marine aluminum alloy decoration and protective coatings, in particular to a marine aluminum alloy environment-friendly anti-scratch, fingerprint-resistant chromium-free chemical conversion liquid and its application in chemical conversion film (ie: preparation of chemical conversion film method). Background technique [0002] 5xxx and 6xxx aluminum alloys have been widely used in ship structural materials in recent years due to their good corrosion resistance, weldability and mechanical properties. Since the oxide film formed spontaneously by aluminum alloy is relatively thin, it cannot meet the requirements of use in harsh environments such as oceans. Due to the erosion of seawater and hot and humid marine atmosphere, the exposed aluminum alloy surface will be corroded and corrosion pits will appear, and a gravel-like white powdery corrosion product will be formed on the entire surface, which will seriously affe...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an environment-friendly anti-scratch and anti-fingerprint chromium-free chemical conversion liquid for marine aluminum alloy and its application in chemical conversion film, so as to solve the problem that the existing environment-friendly chemical conversion treatment process is difficult to meet the requirements of anti-scratch, Fingerprint performance and other issues, its construction is simple and easy to maintain

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