Aluminum passivation solution and preparation method thereof

A technology of aluminum passivation and sodium fluoride, applied in the direction of metal material coating process, etc., can solve the problems of insufficient adhesion, large porosity of passivation film, fast passivation speed, etc., to achieve low porosity, passivation The effect of moderate time and moderate film forming speed

Inactive Publication Date: 2017-05-31
FOSHAN RUIJIAN SPORTS EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the passivation solution is still high in concentration and the passivation speed is too fast, the passivation film obtained has disadvantages such as large void ratio and insufficient adhesion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0050] Examples 1-10 respectively provide the composition of the aluminum passivation solution of the present invention, specifically as listed in Table 1, wherein the unit of the ingredients is g / L.

[0051] Table 1 embodiment 1-10 formula composition

[0052] Example 1 2 3 4 5 6 7 8 9 10 Zinc chromate 3 3 3.5 3.5 4 4 4.5 4.5 5 5 cobalt sulfate 0.5 1 0.8 0.6 0.7 0.9 0.6 1 0.7 0.8 Zirconium Sulfate 2 3 2.8 2.2 2.5 3 2.9 2.1 2 2.7 sodium fluoride 0.8 1.5 0.6 0.9 1.4 1.5 0.5 0.7 1 1.3 sulfuric acid 3 4 2 2.5 3.5 3 4 2 3 4 citric acid 2 2 1 2 2 1 1 2 2 2 water margin margin margin margin margin margin margin margin margin margin

[0053] The preparation method of the passivation solution of the above examples 1-10 is as follows: add 600ml deionized water in a 2000ml beaker, add sulfuric acid and stir well, add zinc chromate, cobalt sulfate, zirc...

Embodiment 15

[0068] Take 100ml of the aluminum passivation solution of Example 7, add water to dilute to 50 times the volume, that is, 5000ml, and mix well to make a passivation working solution (bath solution). The passivation time is 5 minutes. After passivation, the test piece is rinsed with deionized water, and then dried with hot air at 60°C. Observe that the passivation status of each test piece is better, and the color is consistent. Take the 10th, 30th, 50th, 70th, and 100th piece respectively for neutral salt spray corrosion test to measure the porosity of the passivation film layer, passivation film and spray The adhesion of the plastic coating can reach the passivation effect listed in Table 3.

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PUM

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Abstract

The invention provides an aluminum passivation solution, a preparation method and an application method thereof. The raw material ratio of the passivation solution is as follows: 2-5 g / L of zinc chromate, 0.5-1 g / L of cobalt sulfate, 2-3 g / L of zirconium silicate, 0.5-1.5 g / L of sodium fluoride, 2-4 g / L of sulfuric acid, 1-2 g / L of citric acid, and the balance of water. A passivation working solution (a bath solution) prepared from the passivation solution by diluting is stable, relatively low in concentration, and high in passivation speed; an obtained passivation film is low in porosity, and high in adhesive force, can form a yellow chromate film layer on the surface of an aluminum material, has great corrosion resistance and can greatly improve the adhesive force of workpieces with paint or plastic-sprayed coating; and the formed passivation film can resist neutral salt mist for 120 hours above.

Description

technical field [0001] The invention relates to the field of metal surface treatment agents, in particular to an aluminum passivation solution, a preparation method and a use method thereof. Background technique [0002] Due to the high activity, the surface of aluminum and aluminum alloys is easily oxidized and corroded, and passivation treatment is often required. The thickness of the passivation film formed by passivation treatment is large and adjustable, and has appropriate corrosion resistance, wear resistance and stain resistance. At the same time, the passivation film can also improve the adhesion of aluminum and aluminum alloys to paint and other coatings. , often used as the bottom layer of the coating. [0003] At present, the passivation process of aluminum and aluminum alloy is still mainly chromate passivation process. The chromate passivation film layer has good self-repair function and corrosion resistance, and is suitable for almost all aluminum and aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/37
CPCC23C22/37
Inventor 邹明瑞
Owner FOSHAN RUIJIAN SPORTS EQUIP CO LTD
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