Treating fluid for preparing zirconium-containing coloring passive film on surface of aluminum alloy and treating method thereof

A technology of aluminum alloy surface and treatment method, which is applied in the direction of metal material coating process, etc., can solve the problems of corrosion resistance gap, no color, limit the application of passivation film, etc., and achieve high oxidation resistance, good quality and protective performance excellent effect

Inactive Publication Date: 2011-03-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some of these technologies have entered the stage of use, their anti-corrosion effect is still far behind the traditional chromate conversion treatment; among them, the anti-corrosion effect of titanium-zirconium passivation film is particularly remarkable, but because it has no color, Limit the application of this series of passivation film

Method used

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  • Treating fluid for preparing zirconium-containing coloring passive film on surface of aluminum alloy and treating method thereof
  • Treating fluid for preparing zirconium-containing coloring passive film on surface of aluminum alloy and treating method thereof
  • Treating fluid for preparing zirconium-containing coloring passive film on surface of aluminum alloy and treating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Zirconium passivation treatment on the surface of 6063 aluminum alloy profiles

[0050] The zirconium chemical passivation treatment method on the surface of aluminum alloy comprises the following steps:

[0051] (1) Pretreatment: (a) Cut 3×3cm from 6063 large-size aluminum alloy profiles 2 The samples were drilled and polished with SiC water sandpaper to remove the surface dirt of the aluminum alloy, and the surface dirt was cleaned with tap water and used directly or dried for later use, and the aluminum sheet sample was fixed at the punched place with an aluminum wire; (b ) Prepare a NaOH solution with a concentration of 3 wt%, and immerse the aluminum sheet sample in the solution for etching. This step can be processed at room temperature for 5 minutes, and can also be processed for 2 minutes under ultrasonic vibration conditions, and then rinsed with deionized water. Immerse in nitric acid solution for 1 minute, then rinse with deionized water, use dir...

Embodiment 2

[0055] Example 2: 6063 aluminum alloy profile high concentration zirconium passivation treatment

[0056] The zirconium chemical passivation treatment method on the surface of aluminum alloy comprises the following steps:

[0057] (1) Pretreatment: Pretreatment: (a) Cut 3×3cm from 6063 large-size aluminum alloy profiles 2 The samples were drilled and polished with SiC water sandpaper to remove the surface dirt of the aluminum alloy, and the surface dirt was cleaned with tap water and used directly or dried for later use, and the aluminum sheet sample was fixed at the punched place with an aluminum wire; (b ) preparing a NaOH solution with a concentration of 3wt%, immersing the aluminum sheet sample in the solution, treating it at 30° C. for 3 minutes, and then rinsing it with deionized water; (c) immersing the processed sample in step (b) for 10 % (percentage by weight) dipped in dilute nitric acid solution for 1 minute, then rinsed with deionized water, directly used or drie...

Embodiment 3

[0061] Example 3: Zirconium passivation treatment on the surface of 6063 aluminum alloy profiles after simple degreasing

[0062] The zirconium chemical passivation treatment method on the surface of aluminum alloy comprises the following steps:

[0063] (1) Pretreatment: cut 3×3cm from 6063 large-size aluminum alloy profiles 2 Then use SiC water sandpaper to remove the dirt on the surface of the aluminum alloy, clean the surface dirt with tap water and use it directly or dry it for later use, and fix the aluminum sheet sample at the punched place with an aluminum wire.

[0064] (2) Configuration of zirconium chemical passivation treatment solution: configure 100ml of zirconium passivation treatment solution, wherein the concentrations of various components in the treatment solution are as follows: fluorozirconic acid 20g / l, potassium fluoride 0.5g / l, potassium fluorozirconate 0.5 g / l, polyvinyl alcohol 0.8g / l, phosphoric acid to adjust the pH value to 4.0.

[0065] (3) Zirc...

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Abstract

The invention discloses a treating fluid for preparing a zirconium-containing coloring passive film on the surface of an aluminum alloy and a treating method thereof. The zirconium chemical passive treating fluid comprises the following main components of: potassium fluoride, a pH value regulator, fluorozirconate and /or potassium fluozirconate; and the pH value of the treating fluid is between 2.5 and 4.5, and the film can be formed within 3 to 10 minutes. The color of the passive layer prepared by the method is black gray; the film layer is tightly combined with a substrate; and the film layer has high strength and high corrosion resistance. The method is simple in operating process, and a coating does not contain hexavalent chromium which is harmful to the environment and human bodies.

Description

technical field [0001] The invention relates to a chemical passivation treatment method for the surface of aluminum alloys, in particular to a treatment liquid for preparing a zirconium-containing colored passivation film on the surface of aluminum alloys and a treatment method thereof, which can obtain a black-gray coating with uniform thickness on the surface of aluminum alloys, and Alternative to traditional chromate conversion treatments. Background technique [0002] Aluminum alloy has become the second largest metal material in use after steel. Under atmospheric conditions, an extremely thin oxide film can be formed on the surface of aluminum alloys to avoid corrosion, but the corrosion resistance of the natural oxide film on the surface of the aluminum material is limited, and the bonding force between the natural oxide film and organic coatings such as paint is low. Aluminum is easily corroded during use, so aluminum must undergo effective anti-corrosion treatment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/36
Inventor 李文芳陈廷益杜军
Owner SOUTH CHINA UNIV OF TECH
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