Treatment solution for preparing fluorozirconic acid composite conversion film, preparation method of treatment solution and preparation method of conversion film

Abstract

The invention relates to a treatment solution for preparing a fluorozirconic acid composite conversion film, a preparation method of the treatment solution and a preparation method of the conversion film. The preparation method of the conversion film comprises the following steps that the treatment solution containing fluorozirconic acid salt, ammonia water, an auxiliary oxidizing agent, an aminoacid polymer, an accelerant and a complex is prepared firstly, then a metal plate subjected to surface pretreatment is put into a working solution prepared by diluting the treatment solution for chemical conversion film treatment, the treatment time is 1-5 minutes, the treatment temperature is 10-30 DEG C, and finally, washing, drying and cooling are performed to obtain the conversion film. According to the treatment solution for preparing the fluorozirconic acid composite conversion film, the preparation method of the treatment solution and the preparation method of the conversion film, the advantages of less environmental pollution, low treatment temperature, short treatment time, simple process and the like are achieved, a colorless conversion film is formed on the surface of the aluminum alloy, a blue conversion film is formed on the surface of cold rolled steel, the conversion film is compact, the binding force between the conversion film and a powder coating is strong, the impactresistance is strong, a metal surface chromate treatment process can be effectively replaced, and the application prospect is wide.

Description

technical field [0001] The invention relates to a treatment liquid for preparing a fluorozirconate composite conversion film on a metal surface, a preparation method and a method for preparing a fluorozirconate composite conversion film on a metal surface. The method is mainly used as a chromate treatment process for a metal surface substitute. Background technique [0002] Aluminum alloy and steel are the metals with the largest output and consumption in the world. In the production process, people will destroy the integrity of the metal lattice structure in order to improve the mechanical properties of the metal structure, hardness and strength, making the surface of these alloys vulnerable to damage in humid environments. Electrochemical corrosion causes production safety hazards and property losses, which limits its wide application in actual production and life. [0003] The chemical surface treatment methods of aluminum alloy and steel are mainly chromate and phosphat...

AI Technical Summary

Problems solved by technology

Titanium zirconium treatment is a rare industrialized technology in the chromium-free treatment system. This process can form a very thin metal oxide film on aluminum profiles. Masahiko Matsuka invented the coating for all metals such as iron, zinc and aluminum. Pretreatment method (US 20040144451A1), but this method is used in the hydrolysis of silane coupling agent, and the preparation method is complicated; Joseph D.Pemberto invented the pretreatment method (US007815751B2) for processing non-ferrous metals, and the conversion solution contains zirconium salt, Vanadate and fluoride ions, but the conversion solution will contain a small amount of phosphorus; Guo Ruiguang invented a treatment method containing titanium salt, silicate and fluoride for the surface of aluminum alloys (CN1683590A), but the conversion temperature is relatively high , the resulting film is colorless, which is not conducive to observation. Qu Fengzuo invented a chromium-free passivation surface treatment agent (CN102787312A) for aluminum profiles before coating. , one or more of fluorosilicic acid, water-soluble phenolic resin or modified phenolic resin, chitosan, rare earth additives can obtain high corrosion resistance anticorrosion coating at a pH value of 4, but due to the use of phenolic resin Etc. addition ratio, the required steps are complicated, and the preparation time is longer

Xiong Jinping has invented a kind of aluminum alloy surface chemical treatment liquid (CN 101122017A), is made up of titanium sulfate, potassium permanganate, sodium dodecylbenzene sulfonate etc., and this invention film-forming is golden yellow, but transformation temperature is relatively high. High, because the treatment solution contains potassium permanganate, the color is dark, the process is cumbersome, and the corrosion resistance needs to be improved

In addition, most of the above methods are only for aluminum alloy materials, and cannot be used for surface treatment of steel parts.

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