Aluminum passivating agent

A passivating agent, mass percentage technology, applied in the direction of metal material coating process, etc., can solve the problems of environmental pollution, failure to meet the requirements of practical applications, ash hanging, etc., to achieve good corrosion resistance and achieve the effect of environmental protection benefits

Inactive Publication Date: 2015-05-06
杭州美立尔表面处理技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the surface treatment agents for die-casting aluminum on the market are basically conversion film treatment agents composed of trivalent chromium, hexavalent chromium, or rare earth modification combined with strong oxidants. The first two are heavy metals, and there are widespread environmental pollution problems. Although the latter has improved the environmental pollution, it still cannot be completely solved. At the same time, the performance indicators of the conversion film formed on the surface of the die-casting aluminum have declined or cannot meet the requirements of practical applications: the surface of the die-casting aluminum changes color, hangs ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the weight percent of aluminum passivator raw material composition is fluorozirconic acid 3wt%, fluorotitanic acid 2wt%, silica sol 5wt%, citric acid 1wt%, tartaric acid 1wt%, glacial acetic acid 2wt%, ammoniacal liquor 4wt%, remaining The amount is pure water;

Embodiment 2

[0028] Embodiment 2: the weight percent of aluminum passivating agent The raw material composition is 4wt% of fluozirconic acid, 3.5wt% of fluotitanic acid, 6.5wt% of silica sol, 1.5wt% of citric acid, 2wt% of tartaric acid, 2.5wt% of glacial acetic acid, ammoniacal liquor 4.5wt%, the balance is pure water;

Embodiment 3

[0029] Embodiment 3: the weight percent of aluminum passivator raw material composition is fluorozirconic acid 5wt%, fluorotitanic acid 5wt%, silica sol 8wt%, citric acid 2wt%, tartaric acid 3wt%, glacial acetic acid 3wt%, ammoniacal liquor 5wt%, remaining The amount is pure water.

[0030] The proportions in the above three embodiments have significantly improved the environmental protection of the present invention, that is, they do not contain heavy metal elements such as chromium and other strong oxidants, and the surface of the conversion film formed on the aluminum surface obtained by the proportions is denser and more uniform , It is not easy to accumulate dust, thus preventing the foreign matter attached to the aluminum surface from corroding the aluminum to a certain extent, and prolonging the normal service life of aluminum castings.

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PUM

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Abstract

The invention discloses an aluminum passivating agent. According to the key points of the technical scheme, the aluminum passivating agent comprises the following raw materials in percentage by mass: 3-5wt% of fluorozirconic acid, 2-5wt% of fluorotitanic acid, 5-8wt% of silica sol, 1-2wt% of citric acid, 1-3wt% of tartaric acid, 2-3wt% of acetic acid, 4-5wt% of ammonia water and the balance of purified water. The invention aims at providing the aluminum passivating agent which is free of heavy metals and can effectively prevent dust from adhering on the surface of die-cast aluminum after a conversion film is formed.

Description

technical field [0001] The present invention relates to a passivating agent, more specifically, it relates to an environment-friendly aluminum passivating agent free of heavy metals. Background technique [0002] Aluminum passivation agent is a special passivation agent for various aluminum products and aluminum alloy surfaces. It is suitable for forming a chemical passivation film on the surface of aluminum and aluminum alloys. The chemical passivation film obtained by aluminum passivation treatment has good corrosion resistance. It can be used as pre-treatment for paint, plastic coating and decoration. [0003] Aluminum products are more and more widely used in daily life and industrial and agricultural production. Because aluminum is more active, its surface treatment is particularly important. A layer of chemical passivation coating, that is, aluminum passivation agent, is applied to the surface treatment of aluminum and alloys, laying a good foundation for anti-corrosi...

Claims

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Application Information

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IPC IPC(8): C23C22/34
CPCC23C22/34
Inventor 陈良杨红玉陈斌
Owner 杭州美立尔表面处理技术有限公司
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