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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

Active 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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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Gong Xiangguang invented a metal surface silanization treatment agent (CN 102181228A), which is composed of organosilane, organic acid, alcohol, etc. This invention can provide superior adhesion for the combination of metal substrates and various coatings, but the treatment process is relatively complicated , the solution stability is not long enough
[0005] At present, the use of vanadate as conversion treatment is more common in the treatment of magnesium alloys (CN 101418441A) and the treatment of steel (US 20070068602). The composition (CN 101153392A) for the surface treatment of light metals and their composite materials, which mainly contains water-soluble rare earth salts and metavanadates, can improve the corrosion resistance and subsequent paint film adhesion of rare earth conversion coatings, but the method Contains more phosphate, and the corrosion resistance of the film layer needs to be improved

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 : Preparation of self-healing vanadium-zirconium conversion coating on aluminum alloy surface

[0059] Weigh 30 g of fluozirconic acid (mass concentration: 40% to 50%) and 12.5 g of sodium metavanadate, and dissolve them in 450 g of deionized water. Take another 450g of deionized water to dissolve 2.5g of sodium fluoride, 10g of sodium nitrate, 45g of sodium borate and 20g of fluorosilicic acid, and mix the above two components evenly to obtain a light yellow vanadium-zirconium conversion treatment solution with a specific gravity of 1.11 g / cm 3 .

[0060] Dilute the above treatment solution 10 times with water to obtain the working solution, and adjust the pH value to 3.0. Prepare the A6063 aluminum alloy test piece, immerse the aluminum alloy test piece in the commercially available RS-228 acidic degreasing agent (60g / L) for 5min, after washing with deionized water, immerse the above prepared aluminum alloy surface at 30°C Treat the repairing vanadium-...

Embodiment 2

[0064] Weigh 35 g of sodium fluozirconate (mass concentration: 40% to 50%) and 15 g of ammonium metavanadate, and dissolve them in 450 g of deionized water. Take another 450g of deionized water to dissolve 3g of sodium fluoride, 15g of potassium nitrate, 40g of fluoboric acid and 20g of water-based silane DN906, and mix the above two components evenly to obtain a light yellow vanadium-zirconium conversion treatment solution with a specific gravity of 1.14 g / cm 3 .

[0065] Dilute the above treatment solution 15 times with water to obtain the working solution, and adjust the pH value to 2.5. Prepare the A6063 aluminum alloy test piece, immerse the aluminum alloy test piece in the commercially available RS-228 acidic degreasing agent (60g / L) for 8 minutes, wash it with water, and immerse it in the prepared aluminum alloy surface self-healing property at a temperature of 35°C Treatment of the vanadium-zirconium conversion film in the working solution for 6 minutes, the test piec...

Embodiment 3

[0069] Weigh 30 g of potassium fluozirconate (mass concentration: 40% to 50%), and 10 g of potassium metavanadate, and dissolve them in 450 g of deionized water. Take another 450g of deionized water to dissolve 2g of sodium fluoride, 12g of calcium nitrate, 40g of citric acid and 20g of hydrogen peroxide (30% mass concentration), and mix the above two components evenly to obtain a light yellow vanadium-zirconium conversion treatment solution with a specific gravity of 1.12 g / cm 3 .

[0070] Dilute the above treatment solution 12 times with water to obtain the working solution, and adjust the pH value to 3.5. Prepare the A6063 aluminum alloy test piece, immerse it in the commercially available HOS-513 environmental protection weak alkaline degreasing agent (70g / L) for 5 minutes, wash it with water and immerse it in 15% nitric acid solution for 20 seconds, wash it with tap water and deionized water respectively, and then immerse it in The above-mentioned prepared aluminum all...

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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.

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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Application Information

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IPC IPC(8): C23C22/44
Inventor 刘娅莉钟辛吴小松贾玉玉林可佳
Owner 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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