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Chromium-free passivation treatment agent used before coating of cast aluminum alloy workpiece

A chromium-free passivation, cast aluminum alloy technology, applied in the direction of metal material coating technology, can solve the problems of inability to achieve traditional passivation, can not meet the requirements, achieve short processing time, improve corrosion resistance, and simple processing technology. Effect

Active Publication Date: 2015-04-29
合肥华清高科表面技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the chromium-free passivation products of cast aluminum alloys of some manufacturers in the existing market also meet the environmental protection requirements, these products cannot meet the performance of traditional passivation in terms of the matching performance of subsequent coatings, especially the performance of In terms of coating adhesion and overall corrosion resistance, it cannot meet the technical requirements of relevant standards

Method used

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  • Chromium-free passivation treatment agent used before coating of cast aluminum alloy workpiece

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Effect test

Embodiment 1

[0012] A chromium-free passivation treatment agent for cast aluminum alloy workpieces before coating, made of the following raw materials in weight percentages: 5% potassium persulfate, 5% sorbitol, 0.5% ammonium metavanadate, diisobutylnaphthalenesulfonate Sodium phosphate 0.5%, potassium zirconium carbonate 0.1%, ferrocenecarboxylic acid 0.08%, polyoxyethylene lauryl ether 0.05%, sodium pyrrolidone hydroxy acid 0.05%, and the balance is water.

[0013] The preparation method of the above-mentioned chromium-free passivation treatment agent for cast aluminum alloy workpieces before coating comprises the following steps: potassium persulfate and sorbitol are added in water to be miscible in a reaction kettle, and then ammonium metavanadate and diiso Sodium butylnaphthalene sulfonate, stirred and dissolved, and the solution was left to stand for 2 hours; followed by adding potassium zirconium carbonate, ferrocene formic acid, polyoxyethylene lauryl ether, sodium pyrrolidone hydro...

Embodiment 2

[0015] A chrome-free passivation treatment agent for cast aluminum alloy workpieces before coating, which is made of the following raw materials in weight percentage: 10% potassium persulfate, 1% sorbitol, 1.5% ammonium metavanadate, diisobutylnaphthalenesulfonate 0.1% sodium bicarbonate, 0.5% potassium zirconium carbonate, 0.05% ferrocenecarboxylic acid, 0.08% polyoxyethylene lauryl ether, 0.01% sodium pyrrolidone hydroxy acid, and the balance is water.

[0016] The preparation method of the chromium-free passivation treatment agent before coating the cast aluminum alloy workpiece is the same as that in Example 1.

Embodiment 3

[0018] A chromium-free passivation treatment agent for cast aluminum alloy workpieces before coating, made of the following raw materials in weight percentages: 7.5% potassium persulfate, 3% sorbitol, 1% ammonium metavanadate, diisobutylnaphthalenesulfonate Sodium phosphate 0.3%, potassium zirconium carbonate 0.3%, ferrocenecarboxylic acid 0.065%, polyoxyethylene lauryl ether 0.065%, sodium pyrrolidone hydroxy acid 0.03%, and the balance is water.

[0019] The preparation method of the chromium-free passivation treatment agent before coating the cast aluminum alloy workpiece is the same as that in Example 1.

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Abstract

The invention discloses a chromium-free passivation treatment agent used before coating of a cast aluminum alloy workpiece. The chromium-free passivation treatment agent is prepared from raw materials in percentage by weight as follows: 5-10% of potassium persulfate, 1-5% of sorbitol, 0.5-1.5% of ammonium meta-vanadate, 0.1-0.5% of sodium diisobutyl naphthalene sulfonate, 0.1-0.5% of potassium zirconium carbonate, 0.05-0.08% of ferrocenecarboxylic acid, 0.05-0.08% of lauryl alcohol polyoxyethylene, 0.01-0.05% of sodium pyrrolidone carboxylic acid and the balance of water. Compared with the prior art, the chromium-free passivation treatment agent has the benefits that poisonous and harmful content such as hexavalent chromium and the like is not contained, and the environment-friendliness is realized; the corrosion resistance and the adhering force of a passivation film formed on the surface of the cast aluminum alloy workpiece reach a chromating technique level, and a chromating technique can be completely replaced; the treatment process is simple, the treatment time is short, construction is convenient and the treatment agent is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, and in particular relates to a chrome-free passivation treatment agent for cast aluminum alloy workpieces before coating. Background technique [0002] Cast aluminum alloys are widely used in the manufacturing industry. After being prepared according to the standard ratio of cast aluminum alloy components, it is artificially heated to turn it into a liquid or molten state of aluminum alloy, and then the molten state is melted by professional molds or corresponding processes. A process method in which aluminum alloy is poured into the cavity and cooled to form aluminum parts of the desired shape. Commonly used aluminum casting methods are: sand casting, die casting, low pressure casting, precision casting, permanent mold casting, etc. Due to the low electrode potential of aluminum, contact corrosion is very easy to occur when it is in contact with high-potential metals in a humid environmen...

Claims

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Application Information

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IPC IPC(8): C23C22/40
CPCC23C22/40
Inventor 刘万青郑松林
Owner 合肥华清高科表面技术股份有限公司
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