Method for preparing titanium-zirconium/polyhydroxy esterified product composite conversion coating of aluminum alloy surface

An aluminum alloy surface, polyhydroxyl technology, applied in the direction of metal material coating process, can solve problems such as unfavorable observation, corrosion resistance to be improved, complex process, etc., to achieve industrial application, good film-forming performance, process flow simple effect

Inactive Publication Date: 2012-07-18
佛山科富科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Guo Ruiguang invented a treatment method containing titanium salt, silicate and fluoride on the surface of aluminum alloy (CN 1683590A), but the conversion temperature is high, and the resulting film is colorless, which is not conducive to observation
Zhao Xingli et al. invented a chemical conversion film (CN 1827852A) of an aluminum alloy with chromium-free golden yellow color and titanium salt and organic acid, but the conversion temperature is relatively high, and the resulting film is colorless, which is not conducive to observation.
Xiong Jinping invented a chemical treatment method for the surface of aluminum alloy (CN 101122017A), which is composed of titanium sulfate, potassium permanganate, sodium dodecylbenzenesulfonate, etc. The film formed by this invention is golden yellow, but the conversion temperature is relatively low. High, because the treatment solution contains potassium permanganate, the color is dark, the process is complex, and the corrosion resistance needs to be improved
Liu Changsheng and others invented a treatment method for the surface treatment of aluminum alloys containing fluorine-titanic acid, fluorozirconic

Method used

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  • Method for preparing titanium-zirconium/polyhydroxy esterified product composite conversion coating of aluminum alloy surface
  • Method for preparing titanium-zirconium/polyhydroxy esterified product composite conversion coating of aluminum alloy surface
  • Method for preparing titanium-zirconium/polyhydroxy esterified product composite conversion coating of aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0060] Example 1: Preparation of polyhydroxy ester compound a:

[0061] Add 24g of gallic acid, 50g of ethylene glycol, 0.2g of p-toluenesulfonic acid, and 10g of xylene into a four-necked round bottom flask equipped with a stirring rod, condenser and water separator. While stirring, raise the temperature to 130 ℃, after holding for half an hour, add 18g of xylene to keep warm, and stop the reaction when the amount of water in the water trap no longer changes. The material is lowered to room temperature, and the supernatant liquid is removed after layering, and the solvent is removed to obtain a red-brown water-soluble organic additive for use.

[0062] The infrared spectrum of the organic additive a prepared in Example 1 is as figure 1 , 3400 cm -1 ~3200cm -1 The strong and broad absorption peak is mainly the O-H stretching vibration peak, 2879 cm -1 The strong absorption peak is CH 2 Peak of stretching vibration, 1353 cm -1 ~1245cm -1 The strong absorption peak is the stretching...

Example Embodiment

[0064] Example 2 : Preparation of titanium-zirconium / polyhydroxy ester compound conversion coating on aluminum alloy surface

[0065] Weigh 5g of fluotitanic acid (40%-50% by mass), 2.5g of fluozirconic acid (40%-50% by mass), add 5g of fluoboric acid, 4g of boric acid and nitric acid (mass Concentration of 65% ~ 68%) 6g, add a small amount of deionized water to dissolve and mix, then add ammonia water (mass concentration of 25% ~ 28%) 2g, and finally add the polyhydroxy ester compound a3g prepared in Example 1, and mix well. Dilute to 1 liter with deionized water to obtain a yellow transparent chromium-free treatment solution.

[0066] Weigh 50 mL of the above-mentioned treatment solution and dilute it to 1000 mL, and adjust the pH to 5.0, which is the treatment working solution of the titanium-zirconium / polyhydroxy ester compound conversion film on the aluminum alloy surface.

[0067] Prepare the A6063 aluminum alloy test piece, immerse the aluminum alloy test piece in a commerc...

Example Embodiment

[0085] Example 3: Preparation of polyhydroxy ester compound b:

[0086] Add 26g of gallic acid, 48g of 1,4-butanediol, 0.2g of dibutyltin dilaurate, and 12g of butyl acetate into a four-necked round bottom flask with a stirring rod, a condenser and a water separator. While stirring, the temperature was raised to 120°C, after holding for half an hour, 16 g of butyl acetate was added to keep the temperature warm, and the reaction was stopped when the amount of water in the water trap no longer changed. The material is lowered to room temperature, and the supernatant liquid is removed after layering, and the solvent is removed to obtain a red-brown water-soluble organic additive for use.

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Abstract

The invention discloses a method for preparing a titanium-zirconium/polyhydroxy esterified product composite conversion coating of an aluminum alloy surface, which comprises the following steps of pre-treating and washing the aluminum alloy surface, diluting treating fluid by 19-20 times to serve as a working solution, adjusting a potential of hydrogen (pH) value to be in a range of 4.0-6.0, and placing aluminum alloy into the working solution to perform chemical conversion coating treatment, wherein the treating time is 3-10 min and the treatment temperature is 20-50 DEG C; and then performing washing, drying and cooling to obtain the titanium-zirconium/polyhydroxy esterified product composite conversion coating. The treating fluid comprises, by concentration, titanate 2-5 g/L, zirconate1-2.5 g/L, nitric acid 2.5-6 g/L, ammonia water 0.5-2 g/L, accelerating agent 6-9 g/L and polyhydroxy esterified product 2-7 g/L. An aluminum surface chromium-free treating method is low in treating temperature and short in treatment time, and a yellow composite conversion coating can be formed on the aluminum alloy surface. The conversion coating is excellent in corrosion resistance, high in bond strength with base metal, simple in process, low in treating fluid concentration, capable of effectively replacing an aluminum alloy surface chromate treatment process and wide in application prospect.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing a titanium-zirconium / polyhydroxy ester compound conversion film on the surface of an aluminum alloy. The method is mainly used as a substitute for the chromate treatment process on the aluminum surface. Background technique [0002] Aluminum is a non-ferrous metal that is second only to steel in terms of output and consumption in the world. Aluminum alloy has the characteristics of light weight, high specific strength, high thermal conductivity, and good heat dissipation. As a light structural material, aluminum alloy is light in weight and light in weight. Various vehicles of sea, land and air, especially aircraft, missiles, rockets, artificial earth satellites, etc., use a large amount of aluminum. However, aluminum has a fairly strong electronegativity and has a strong affinity for oxygen, forming a thin oxide film in the atmosphere. This film cannot me...

Claims

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Application Information

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IPC IPC(8): C23C22/44
Inventor 刘娅莉惠海军贾玉玉吴小松袁兴李蔚虹
Owner 佛山科富科技有限公司
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