A kind of high-adhesion phytic acid-based aluminum alloy surface colored chemical conversion film solution and its application

Abstract

The invention relates to a high-adhesion phytic acid-based aluminum alloy surface colored chemical conversion film solution and its application. The high-adhesion phytic acid-based aluminum alloy surface colored chemical conversion film solution includes the following raw materials in mass percentage: Based on 100%, phytic acid 0.5%-2.5%, zinc oxide 1.0%-5.0%, molybdate 0.1%-3.0%, fluorine salt 0.1%-2.0%, chlorate 0.1%-2.0%, titanium salt 0.1% ~2.0%, sulfate 0.1%~2.0%, and the balance is water. The high-adhesion phytic acid-based aluminum alloy surface colored chemical conversion film solution provided by the present invention contains few types of substances, is simple to prepare, uses phytic acid as the main film-forming substance, and forms a phytic acid metal complex with a rough surface layered structure film layer. The application and operation of the high-adhesion phytic acid-based aluminum alloy surface colored chemical conversion coating liquid provided by the present invention is simple, environmentally friendly, not easy to generate waste liquid discharge, saves energy, and can meet the use requirements of the conversion coating liquid at room temperature.

Description

technical field [0001] The invention relates to a high-adhesion phytic acid-based aluminum alloy surface colored chemical conversion film solution and its application, belonging to the technical field of metal surface pretreatment. Background technique [0002] Aluminum alloy is currently the most widely used non-ferrous metal material, because of its excellent mechanical properties, it is widely used in aerospace, automotive, shipbuilding, machinery and electronics and other industrial fields. However, aluminum alloys also face serious corrosion problems. The oxide film formed under natural conditions is uneven and has poor corrosion resistance, and pitting corrosion, crevice corrosion, and stress corrosion are prone to occur. Therefore, the surface of the aluminum alloy needs to be treated with anticorrosion, and in practical application, the aluminum alloy needs to be treated with coating for anticorrosion. Pretreatment before painting can not only improve the corrosion ...

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Problems solved by technology

However, there are many problems in the existing phosphating film formation technology: the phosphate film layer has many porous structures and microcracks, which leads to its weakened corrosion resistance and cannot meet the needs of modern industries; Increased energy consumption will cause environmental problems, and will also cause poor uniformity and compactness of the phosphating film. The film formation speed of traditional low-temperature phosphating is slow, and the production efficiency is low. The discharge of inorganic phosphorus in the waste liquid will lead to eutrophication of the water body. and the color of the aluminum alloy phosphating film is not obvious, and the adhesion to the paint film is poor

This patent contains toxic substances, which poses a safety hazard, and the amount of inorganic phosphorus used is large, which may easily lead to water eutrophication caused by waste liquid discharge.

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