Titanium dioxide conversion coating liquid on aluminum alloy surface and its application method

A technology of aluminum alloy surface and titanium dioxide, applied in the direction of metal material coating process, etc., can solve the problems of process instability, large energy, pollution, etc., and achieve the effect of uniform color, excellent corrosion resistance and simple composition

Inactive Publication Date: 2017-05-24
无锡铱美特科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to overcome the pollution of the environment by the above-mentioned prior art, as well as the disadvantages of unstable process and large energy consumption, and provide a titanium salt chromium-free chemical conversion solution for treating aluminum with simple components, easy waste water disposal, and little environmental impact Alloy surface method, so that the aluminum alloy surface forms a titanium dioxide conversion film with excellent corrosion resistance, uniform color and green environmental protection

Method used

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  • Titanium dioxide conversion coating liquid on aluminum alloy surface and its application method
  • Titanium dioxide conversion coating liquid on aluminum alloy surface and its application method
  • Titanium dioxide conversion coating liquid on aluminum alloy surface and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Degrease the 5052 aluminum alloy with Turco4215NC-LT degreasing solution from Turco Products Inc. of the United States, and then immerse it in a NaOH solution with a temperature of 60-70 ° C and a mass content of 5-10% for 5 minutes;

[0027] Immerse the aluminum alloy after alkali washing in a nitric acid solution with a mass content of 5-10% at room temperature for 1-3 minutes, and then rinse it with deionized water;

[0028] (2) Soak the aluminum alloy after surface pretreatment in the titanium dioxide conversion coating solution on the aluminum alloy surface at 20°C for 1 minute, take it out, wash it and dry it in the air to form a conversion coating on the aluminum alloy surface.

[0029] The titania conversion coating liquid on the surface of the aluminum alloy is dissolved in 1 liter of water by dissolving 0.05 g of titanyl sulfate and 0.1 g of ammonium fluoride, and adjusting the pH of the conversion liquid to 3.5 with sulfuric acid.

[0030] The conversion ...

Embodiment 2

[0032] (1) The pretreatment steps are the same as in Example 1;

[0033] (2) Soak the aluminum alloy after surface pretreatment in the titanium dioxide conversion coating solution on the aluminum alloy surface at 20°C for 5 minutes, take it out, wash it and dry it in water, and form a conversion coating on the aluminum alloy surface.

[0034] The titania conversion coating liquid on the surface of the aluminum alloy is dissolved in 1 liter of water by dissolving 0.5 g of titanyl sulfate and 0.3 g of ammonium fluoride, and adjusting the pH of the conversion liquid to 4.0 with sulfuric acid.

[0035] The conversion coating prepared in this example has a uniform color and does not corrode after 14 days of neutral salt spray test.

[0036] Such as figure 1 with figure 2 Shown, embodiment 2 transforms and processes sample and carries out scanning electron microscope SEM picture and EDS energy spectrum analysis result. The analysis results show that the conversion film has an am...

Embodiment 3

[0039] (1) The pretreatment steps are the same as in Example 1;

[0040] (2) Soak the aluminum alloy after surface pretreatment in the titanium dioxide conversion coating solution on the aluminum alloy surface at 20°C for 15 minutes, take it out, wash it and dry it in the air, and form a conversion coating on the aluminum alloy surface.

[0041] The titanium dioxide conversion coating solution on the surface of the aluminum alloy was dissolved in 1 liter of water with 1.0 g of titanyl nitrate and 0.8 g of potassium fluoride, and the pH of the conversion solution was adjusted to 4.5 with sulfuric acid.

[0042] The conversion coating prepared in this example has a uniform color and does not corrode in the neutral salt spray test for 9 days.

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Abstract

The invention relates to an aluminum alloy surface treating technology and particularly relates to an aluminum alloy surface titanium dioxide conversion coating solution and a using method thereof. The aluminum alloy surface titanium dioxide conversion coating solution is an aqueous solution which contains titanium salt and fluoride, and the pH value of the aqueous solution is regulated to 3.5-4.5 by using non-reducing acid. After being pretreated, the surface of aluminum alloy is soaked into the aluminum alloy surface titanium dioxide conversion coating solution for 1-15min, thus a conversion coating is formed on the surface of the aluminum alloy. According to the invention, the chemical conversion treatment is carried out by using titanium salt instead of chromic acid, the surface of the aluminum alloy is etched by using low-concentration fluorine ions, and titanyl sulfate or titanyl nitride is induced to hydrolyze to generate a titanium dioxide conversion coating on the surface of the aluminum alloy, wherein the titanium dioxide conversion coating is uniform in color and luster and excellent in corrosion resistance. The titanium salt is nonpoisonous, the conversion solution is simple in component, no great number of energy is consumed, and no environment hazards are caused, therefore, a clean production process is achieved.

Description

technical field [0001] The invention relates to an aluminum alloy surface treatment technology, in particular to a titanium dioxide conversion film liquid on the surface of an aluminum alloy and a method for using the same. Background technique [0002] Chromate chemical conversion coating technology on metal surfaces has been one of the most widely used technologies for metal surface corrosion protection treatment due to its excellent anti-corrosion performance, good adhesion with organic coatings, and economical convenience. However, due to the carcinogenicity of chromate, this technology is gradually canceled and banned. [0003] In search of alternative technologies, various chrome-free treatments have been proposed. As in "chrome-free conversion coating" disclosed in US Pat. No. 6,638,369, a conversion solution containing sodium titanate or potassium titanate, potassium ferricyanide, and fluoride and nitric acid is used. Since the sodium titanate or potassium titanate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34
Inventor 郭瑞光崔王鹏姚建国李海燕秦忠原檀丽萍
Owner 无锡铱美特科技有限公司
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