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Aluminum and aluminum alloy passivation solution, preparation method and using method thereof

A technology of aluminum alloy and passivation solution, which is applied in the coating process of metal materials, etc., can solve the problems of high porosity of passivation film, insufficient adhesion, fast passivation speed, etc., achieve good effect, save energy, easy to control effects

Active Publication Date: 2015-03-25
HUNAN JINYU CHEM
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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

[0051] Examples 1-10 respectively provide the composition of the aluminum and aluminum alloy passivation solutions of the present invention, specifically as listed in Table 1, wherein the unit of the ingredients is g / L.

[0052] Table 1 embodiment 1-10 formula composition

[0053] 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 nitric 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

[0054] 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 nitric acid and stir well, add zinc chromate,...

Embodiment 15

[0069] Take 100ml of the aluminum and aluminum alloy passivation solution in 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), and passivate 100 pieces of the above-mentioned test pieces at 25°C For treatment, 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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Abstract

The invention provides an aluminum and aluminum alloy passivation solution, preparation method and using method thereof; the raw material ratios of the passivation solution are as follows: 3-5g / L of zinc chromate, 0.5-1g / L of cobaltous sulfate, 2-3g / L of zirconium sulfate, 0.5-1.5g / L of sodium fluoride, 2-4g / L of nitric acid, 1-2g / L of citric acid, and the rest amount is water. A passivation working solution (bath solution) which is prepared by diluting the passivation solution is stable, low concentration, fast in passivation speed, low void ratio of the obtained passivation film, is able to form a yellow chromate film layer on surface of the aluminum product, has an excellent anti-corrosion property, and is able to greatly increase the paint or coating layer adhesive force on the work piece. The property of the formed passivation film for resisting neutral salt mist is more than 120 hours.

Description

technical field [0001] The invention relates to the field of metal surface treatment agents, more specifically, to an aluminum and aluminum alloy 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/37C23C22/73
CPCC23C22/37C23C22/73
Inventor 桂成方
Owner HUNAN JINYU CHEM
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