Treating fluid and method for preparing vanadium-zirconium composite conversion coatings with self-repairing performance on aluminum alloy surfaces through same

An aluminum alloy surface and self-healing technology, which is applied in the direction of metal material coating technology, can solve the problems of complex processing technology, insufficient solution stability, and the corrosion resistance of the film layer needs to be improved, so as to achieve simple process flow, The effect of short conversion processing time and low cost
CN102766862AActive Publication Date: 2012-11-07湖南松井先进表面处理与功能涂层研究院有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
湖南松井先进表面处理与功能涂层研究院有限公司
Publication Date
2012-11-07

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Abstract

The invention belongs to the technical field of chemical materials, and relates to a treating fluid and a method for preparing vanadium-zirconium composite conversion coatings with self-repairing performance on aluminum alloy surfaces through the same. The method includes the steps of firstly preparing the treating fluid containing fluorozirconate, metavanadate, sodium fluoride, nitrate, an accelerate and an additive; then putting an aluminum alloy after surface pretreatment into a working fluid made of the diluted treating fluid for 2min-10min; and finally subjecting the aluminum alloy to washing, drying and cooling to obtain the vanadium-zirconium composite conversion coatings. The preparation process is simple, heavy metals such as hexavalent chromium and nickel are not contained, the environment is friendly, the conversion coatings of the aluminum alloy after a conversion coating treatment are dense and high in binding force, metal ions in the conversion coatings can bond with base metal under a corrosion environment and provided with a certain self-repairing performance, and the treating technology of vanadium-zirconium conversion coatings can effectively replace chromate treatment on aluminum alloy surfaces.
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Description

technical field

[0001] The invention belongs to the technical field of chemical materials, and relates to a treatment liquid and a method for preparing a self-healing vanadium-zirconium conversion film on the surface of an aluminum alloy by using the treatment liquid. The method is mainly used as a substitute for the chromate treatment process on the aluminum surface. Background technique

[0002] Aluminum alloy has the characteristics of low density, excellent mechanical properties, good machinability, and strong electrical and thermal conductivity. The second largest metal material after steel. However, the corrosion resistance of aluminum is poor. In the atmosphere, especially in a humid environment, a thin oxide film is easily formed on the surface of aluminum alloy. This film cannot meet the protection requirements of the industry and affects the stability of product quality.

[0003] For a long time, the surface passivation of aluminum alloy and the surface treatment ...

Claims

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