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Aluminum alloy natural color chromate-free passivation treatment agent and preparation method thereof

A chromium-free passivation and treatment agent technology, applied in the coating process of metal materials, etc., can solve problems such as inability to use normally, and achieve the effects of short treatment time, improved corrosion resistance, and improved corrosion resistance

Active Publication Date: 2019-04-12
LINYI JINHU COLOR COATING ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the aluminum alloy chromium-free passivation technologies disclosed above can replace the traditional hexavalent chromium passivation and have excellent corrosion resistance, the original surface color of the aluminum alloy will change after corresponding treatment, making the chromium-free passivation It cannot be used normally in some occasions that require the application of the original color of aluminum alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A chromium-free passivation treatment agent for aluminum alloys, made of the following raw materials in weight percentage: 10% potassium persulfate, 1% sorbitol, 1.5% ammonium metavanadate, and 0.1% sodium diisobutylnaphthalenesulfonate , potassium zirconium carbonate 0.5%, polyoxyethylene lauryl ether 0.05%, sodium pyrrolidone hydroxy acid 0.05%, cerium oxalate 0.05%, fluozirconic acid 10%, oxalic acid 0.5%, and the balance is water.

[0021] The preparation method of the above-mentioned aluminum alloy natural color chromium-free passivation treatment agent comprises the following steps: adding potassium persulfate and sorbitol into the reaction kettle to be miscible, and then adding ammonium metavanadate and diisobutylnaphthalenesulfonate After stirring and dissolving, the solution was allowed to stand for 2 hours; followed by adding potassium zirconium carbonate, polyoxyethylene lauryl ether, sodium pyrrolidone hydroxy acid, cerium salt, inorganic acid and organic aci...

Embodiment 2

[0023] A chromium-free passivation treatment agent for aluminum alloy, made of the following raw materials in weight percentage: 5% potassium persulfate, 5% sorbitol, 0.5% ammonium metavanadate, and 0.5% sodium diisobutylnaphthalenesulfonate , potassium zirconium carbonate 0.1%, polyoxyethylene lauryl ether 0.08%, sodium pyrrolidone hydroxy acid 0.01%, cerium octoate 0.1%, fluotitanic acid 3%, oxalic acid 2%, and the balance is water.

[0024] The preparation method of the aluminum alloy natural color chromium-free passivation treatment agent is the same as that in Example 1.

Embodiment 3

[0026] A chromium-free passivation treatment agent for aluminum alloys, made of the following raw materials in weight percentages: 8% potassium persulfate, 2% sorbitol, 1% ammonium metavanadate, and 0.3% sodium diisobutylnaphthalenesulfonate , potassium zirconium carbonate 0.3%, polyoxyethylene lauryl ether 0.05%, sodium pyrrolidone hydroxy acid 0.03%, cerium formate 0.08%, a mixture of fluozirconic acid and fluotitanic acid with a mass ratio of 1:1 5%, formic acid 1.5%, and The amount is water.

[0027] The preparation method of the aluminum alloy natural color chromium-free passivation treatment agent is the same as that in Example 1.

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Abstract

The invention discloses an aluminum alloy natural color chromate-free passivation treatment agent. The aluminum alloy natural color chromate-free passivation treatment agent is prepared from, by weight percentage, 5-10% of potassium persulfate, 1-5% of sorbitol, 0.5-1.5% of ammonium metavanadate, 0.1-0.5% of sodium diisobutyl naphthyl sulfonate, 0.1-0.5% of potassium zirconium carbonate, 0.05-0.08% of polyoxyethylene 10 lauryl ether, 0.01-0.05% of sodium pyrrolidone carboxylate, 0.05-0.1% of cerium salt, 3-10% of inorganic acid, 0.5-2% of organic acid and the balance water. The cerium salt isone or a mixture of cerium oxalate, cerium zincate, cerium formate and cerium acetate. The inorganic acid is one of hexafluorozirconic acid and hexafluorotitanic acid or a mixture of both. The organicacid is one of formic acid, acetic acid and oxalic acid. According to the chromate-free passivation treatment agent, a chromate-free passivation film formed on the surface of aluminum alloy is colorless and transparent, and the natural color of the aluminum alloy is not changed; and after treatment is conducted through the aluminum alloy natural color chromate-free passivation treatment agent, the corrosion resistance of the aluminum alloy is greatly improved, and the treatment agent can be applied to occasions without surface coating.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, and in particular relates to an aluminum alloy natural color chromium-free passivation treatment agent and a preparation method thereof. Background technique [0002] Metal surface treatment is an effective method to improve the resistance of steel to atmospheric corrosion. However, the treatment layer is prone to corrosion in a humid environment, causing the surface to form corrosion products or turn gray and dark, which affects the appearance and must be passivated. The phenomenon that a dense oxide protective layer is formed on the surface of metals such as steel and aluminum to prevent further reaction with the metal is called passivation. The most widely used at present is the chromate passivation treatment. The main reason is that the process is simple, low cost and good corrosion resistance. After chromate treatment, a chromium / matrix metal mixed oxide film layer is formed, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44C23C22/46
CPCC23C22/44C23C22/46
Inventor 王冬生
Owner LINYI JINHU COLOR COATING ALUMINUM IND
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