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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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 acid and organic phosphoric acid compounds (CN 101161861A). The conversion film of this invention is colorless and contains phosphorus, which is easy to pollute the environment
Li Wenfang and others invented a treatment solution for the yellow passivation film on the surface of aluminum alloy, a treatment method containing fluorine titanic acid, fluorozirconic acid, manganese salt, and organic acid (CN 101967633 A). The disadvantage is that it contains manganese salt and the treatment solution is dark in color. , and the treatment time is longer, and the pH range of the treatment solution is narrower
Li Wenfang et al. invented a treatment solution containing potassium fluoride, a pH regulator, and fluozirconic acid and / or potassium fluozirconate passivation film on the surface of an aluminum alloy and its treatment method (CN 101985750A), But its conversion coating is black gray
Liang Xueyun invented a treatment method for aluminum alloys containing phosphoric acid, potassium titanium oxalate, fluorozirconic acid, sodium fluoride, citric acid, and nitric acid (CN 101358341A). This invention contains phosphorus and pollutes water resources

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

Embodiment 1

[0060] Embodiment 1: the preparation of polyhydroxy ester compound a:

[0061] 24g of gallic acid, 50g of ethylene glycol, 0.2g of p-toluenesulfonic acid, and 10g of xylene were added to a four-necked round-bottomed flask with a stirring rod, a condensation device and a water separator, and the temperature was raised to 130 while stirring. ℃, after keeping warm for half an hour, add 18g xylene and keep warm, when the amount of water in the water separator no longer changes, stop the reaction. The material was lowered to room temperature, and after the layers were separated, the supernatant liquid, namely the solvent, was removed to obtain a reddish-brown water-soluble organic additive for use.

[0062] Embodiment 1 makes the infrared spectrum of organic additive a such as figure 1 , 3400 cm -1 ~3200cm -1 The strong and broad absorption peak at 2879 cm is mainly the stretching vibration peak of O-H -1 The strong absorption peak is CH 2 The stretching vibration peak of , ...

Embodiment 2

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

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

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

[0067] Prepare the A6063 aluminum alloy test piece, immerse the aluminum allo...

Embodiment 3

[0085] Embodiment 3: the preparation of polyhydroxy ester compound b:

[0086] 26g of gallic acid, 48g of 1,4-butanediol, 0.2g of dibutyltin dilaurate, and 12g of butyl acetate were added to a four-neck round-bottomed flask with a stirring rod, a condensation device and a water separator, While stirring, the temperature was raised to 120°C. After keeping the temperature for half an hour, add 16g of butyl acetate and keep the temperature. When the amount of water in the water separator no longer changes, stop the reaction. The material was lowered to room temperature, and after the layers were separated, the supernatant liquid, namely the solvent, was removed to obtain a reddish-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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