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Aluminum passivator and preparation method thereof

A technology of passivating agent and solution, which is applied in the coating process of metal materials, etc., and can solve problems such as environmental pollution, conversion film performance index decline, and failure to meet the requirements of practical applications.

Inactive Publication Date: 2015-05-13
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 treatment agents used on the surface of die-casting aluminum on the market are basically conversion coating treatment agents composed of trivalent chromium, hexavalent chromium or rare earth modification combined with strong oxidants. Environmental pollution has been improved, but the problem still cannot be completely solved. At the same time, various performance indicators of the conversion film formed on the surface of die-casting aluminum have declined or failed to meet the requirements of practical applications; After that, the binding ability decreases; the corrosion resistance decreases or does not pass the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of passivating agent, comprising the following steps:

[0028] S1: Add 5 parts of silica sol, which is used as membrane skeleton, to water. In this embodiment, the silica sol is obtained by hydrolysis of silane. Silane is added to water, and the silica sol is produced by hydrolysis of silane.

[0029] S2: Fluozirconic acid for catalysis is also added, and the amount of said fluozirconic acid added is 3 parts. The fluozirconic acid here is used to catalyze the hydrolysis reaction of silane, which can make it form a silica sol skeleton more quickly. Fluorozirconic acid here is only a preferred embodiment because of its excellent catalytic effect. Other chemicals capable of catalyzing the hydrolysis of silanes are also possible.

[0030] S3: adding 1-3 parts by mass of flexible edible acid to it and mixing it to adjust the pH value to 3. In this embodiment, the flexible edible acid is 1 part of citric acid and 2 parts of glacial acetic acid.

[00...

Embodiment 2

[0035] A preparation method of passivating agent, comprising the following steps:

[0036] S1: Add 8 parts of silica sol, which is used as membrane skeleton, to water. In this embodiment, the silica sol is obtained by hydrolysis of silane. Silane is added to water, and the silica sol is produced by hydrolysis of silane.

[0037] S2: Fluozirconic acid for catalysis is also added, and the amount of said fluozirconic acid added is 5 parts. The fluozirconic acid here is used to catalyze the hydrolysis reaction of silane, which can make it form a silica sol skeleton more quickly. Fluorozirconic acid here is only a preferred embodiment because of its excellent catalytic effect. Other chemicals capable of catalyzing the hydrolysis of silanes are also possible.

[0038] S3: adding 1-3 parts by mass of flexible edible acid to it and mixing it to adjust the pH value to 3. In this embodiment, the flexible edible acid is 2 parts of citric acid and 3 parts of glacial acetic acid.

[0...

Embodiment 3

[0043] A preparation method of passivating agent, comprising the following steps:

[0044] S1: Add the silica sol used as the membrane skeleton into the water, 6 parts of the silica sol. In this embodiment, the silica sol is obtained by hydrolysis of silane. Silane is added to water, and the silica sol is produced by hydrolysis of silane.

[0045] S2: Fluozirconic acid used for catalysis is also added, and the amount of said fluozirconic acid added is 4 parts. The fluozirconic acid here is used to catalyze the hydrolysis reaction of silane, which can make it form a silica sol skeleton more quickly. Fluorozirconic acid here is only a preferred embodiment because of its excellent catalytic effect. Other chemicals capable of catalyzing the hydrolysis of silanes are also possible.

[0046] S3: adding 1-3 parts by mass of flexible edible acid to it and mixing it to adjust the pH value to 3. In this embodiment, the flexible edible acid is 2 parts of citric acid and 1 part of gla...

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Abstract

The invention discloses an aluminum passivator which is prepared from the following raw materials in parts by weight: 5-8 parts of silica sol, 1-3 parts of citric acid, 1-3 parts of glacial acetic acid, 2-5 parts of hexafluorotitanic acid, 3-5 parts of hexafluorozirconic acid, 2 parts of L-tartaric acid, 4-5 parts of ammonia water and 69-82 parts of water. The invention aims at providing a preparation method which is good in effect and free of pollution, for the aluminum passivator.

Description

technical field [0001] The invention relates to a preparation method of articles commonly used in the metallurgical industry, more specifically, it relates to an aluminum passivator and a preparation method thereof. Background technique [0002] Aluminum passivation agent is aluminum passivation agent and aluminum polishing agent. It is an environmentally friendly passivation agent dedicated to the surface of various aluminum products and aluminum alloys. It is suitable for forming a chemical passivation film on the surface of aluminum and aluminum alloys. The obtained chemical passivation film has excellent anti-corrosion properties and can be used as pre-treatment for paint, plastic and decoration. [0003] Aluminum products are more and more widely used in daily life and industrial and agricultural production. Because metal aluminum is relatively active, if these aluminum products are placed directly in the air, they will be easily oxidized, so the surface treatment of al...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/68
CPCC23C22/34C23C22/68
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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