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Treatment liquid and treatment method for rapid preparation of colored composite conversion film on aluminum alloy surface

A technology of aluminum alloy surface and treatment method, applied in the direction of metal material coating process, etc., can solve the problems of film forming speed and processing cost gap, difficult to identify, high processing temperature, improve corrosion resistance, short film forming time, The effect of excellent corrosion resistance

Active Publication Date: 2018-08-24
广州市建筑材料工业研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are a small number of Chinese invention patent applications involving chromium-free technology, but all of them have the following shortcomings, which limit their wide application in production
Its disadvantages are mainly as follows: (1) Most of the titanium-zirconium conversion coating is colorless, which is difficult to identify with the naked eye, which is not conducive to online judgment in production; (2) The treatment temperature is high and the process is complicated, compared with traditional chromate treatment , there is a huge gap between film forming speed and processing cost, it is difficult to popularize and use

Method used

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  • Treatment liquid and treatment method for rapid preparation of colored composite conversion film on aluminum alloy surface
  • Treatment liquid and treatment method for rapid preparation of colored composite conversion film on aluminum alloy surface
  • Treatment liquid and treatment method for rapid preparation of colored composite conversion film on aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of a colored conversion film on the surface of an aluminum alloy

[0037] The process for preparing a colored conversion film on the surface of an aluminum alloy comprises the following steps:

[0038] (1) Add a certain amount of sodium hydroxide to 200mL of deionized water to adjust the pH to 9, then add 6g of tannic acid and stir, then stand for 45min and set aside.

[0039] (2) Pretreatment: ①Grind the aluminum alloy sample step by step with 600#, 800#, 1000# water sandpaper, and clean it with deionized water; ②Put the aluminum alloy after ①treatment into a mixed alkali aqueous solution (NaOH 5~10wt%, Na 2 CO 3 5-10wt%) for 1 minute, rinse with deionized water.

[0040] (3) Preparation of colored conversion coating treatment solution on aluminum alloy surface: 1.0 g / L of fluotitanic acid; 1.0 g / L of fluozirconic acid; 2.0 g / L of sodium fluoride. Each component: 0.2 g of fluotitanic acid; 0.2 g of fluozirconic acid; 0.4 g of sodium fluoride...

Embodiment 2

[0043]Example 2: Preparation of golden yellow organic-inorganic composite conversion film on the surface of 6063 aluminum alloy

[0044] The process for preparing a colored conversion film on the surface of an aluminum alloy comprises the following steps:

[0045] (1) A certain amount of potassium hydroxide was added to 200 mL of deionized water to adjust the pH to 10, then 4 g of tannic acid was added and stirred, and then left for 30 min for later use.

[0046] (2) Pretreatment: ①Grind the aluminum alloy sample step by step with 600#, 800#, 1000# water sandpaper, and clean it with deionized water; ②Put the aluminum alloy after ①treatment into a mixed alkali aqueous solution (NaOH 5~10wt%, Na 2 CO 3 5-10wt%) for 3 minutes, rinse with deionized water.

[0047] (3) Preparation of colored conversion coating treatment solution on aluminum alloy surface: 2.0 g / L fluotitanic acid; 2.0 g / L fluozirconic acid; 2.0 g / L potassium fluoride. Each component: 0.4 g of fluotitanic acid;...

Embodiment 3

[0050] Example 3: Preparation of golden yellow organic-inorganic composite conversion film on the surface of 6063 aluminum alloy

[0051] The process for preparing a colored conversion film on the surface of an aluminum alloy comprises the following steps:

[0052] (1) A certain amount of potassium hydroxide was added to 200 mL of deionized water to adjust the pH to 11, then 8 g of tannic acid was added and stirred, and then left for 45 min for later use.

[0053] (2) Pretreatment: ①Grind the aluminum alloy sample step by step with 600#, 800#, 1000# water sandpaper, and clean it with deionized water; ②Put the aluminum alloy after ①treatment into a mixed alkali aqueous solution (NaOH 5~10wt%, Na 2 CO 3 5-10wt%) for 2 minutes, rinse with deionized water.

[0054] (3) Preparation of colored conversion coating treatment solution on aluminum alloy surface: 4.0 g / L fluotitanic acid; 4.0 g / L fluozirconic acid; 4.0 g / L potassium fluoride. Each component: 0.8 g of fluotitanic acid...

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Abstract

The invention belongs to the technical field of aluminum alloy corrosion and protection and discloses treating fluid for rapidly preparing a non-ferrous composite conversion film on the surface of aluminum alloy and a treating method of the treating fluid. The treating fluid is prepared by the method comprising the following steps that tannic acid is dissolved in a solution including accelerants to be hydrolyzed and mixed with other components to obtain the treating fluid. The treating fluid per liter is composed of hexafluorotitanic acid of 1.0-4.0 g, fluozirconic acid of 1.0-4.0 g, tannic acid of 1.0-4.0 g and villiaumite of 1.0-4.0 g, wherein pH is 3.0-5.0. The invention further provides the treating method for rapidly preparing the non-ferrous composite conversion film on the surface of the aluminum alloy based on the treating fluid. The treating fluid is short in film forming time, the treating time is 0.5-2 min, the film forming effect is good, the treating fluid does not contain chrome or other toxic substances and is safe and environmentally friendly, heating is not needed, and the golden yellow composite conversion film with excellent corrosion resistance can be rapidly prepared on the surface of the aluminum alloy.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy corrosion and protection, and in particular relates to a treatment solution for rapidly preparing a colored composite conversion film on the surface of an aluminum alloy and a treatment method thereof. Background technique [0002] Aluminum alloys are widely used, but their corrosion resistance is poor, and they usually undergo strict surface anti-corrosion treatment before use. Taking aluminum profiles as an example, spraying treatment is generally required, and the chemical conversion treatment before spraying is particularly critical. Chemical conversion treatment can not only improve the corrosion resistance of aluminum profiles, but also increase the bonding force between aluminum profiles and organic coatings. Aluminum alloy surface treatment methods mainly include electroplating, micro-arc oxidation and chemical conversion coating. Among them, the chemical conversion coating method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34
CPCC23C22/34
Inventor 易爱华高世杰邬玉龙罗中城禚德仁杨思宇
Owner 广州市建筑材料工业研究所有限公司