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Environment-friendly aluminum profile spraying pretreatment process

A green and environmentally friendly aluminum profile technology, applied in the field of aluminum alloy processing, can solve the problems of easy pollution of environmental water resources, high treatment costs, etc.

Pending Publication Date: 2021-06-08
FUJIAN MINFA ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, aiming at the above content, the present invention provides a green and environment-friendly aluminum profile spraying pretreatment process, which solves the problem that the existing aluminum profile spraying pretreatment process produces a large amount of fluorine-containing and chromium-containing industrial waste, which not only has high processing costs, but also easily pollutes the environment and water problem

Method used

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  • Environment-friendly aluminum profile spraying pretreatment process
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  • Environment-friendly aluminum profile spraying pretreatment process

Examples

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Effect test

Embodiment 1

[0038] A kind of green environmental protection aluminum profile spraying pre-treatment process, the aluminum profile top hangs on the continuous conveying system, carries out various spraying pre-treatments in the conveying process, specifically comprises the following steps:

[0039] (1) Washing:

[0040] Clean the aluminum profile with tap water to remove dust and debris;

[0041] (2) Alkaline washing and degreasing:

[0042] Dissolve the degreasing agent in water to make a degreasing liquid, the concentration of the degreasing liquid is 1.5%, and spray the aluminum profile to remove oil. The degreasing agent includes the following components in parts by weight: 15 parts of sodium hydroxide, 8 parts of potassium, 1 part of aluminum hydroxide, 5 parts of sodium gluconate, 5 parts of sodium nitrite, 0.1 part of sodium thiosulfate;

[0043] The degreasing liquid is recycled, and the ion concentration of the degreasing liquid is monitored and controlled within the following r...

Embodiment 2

[0061] A kind of green environmental protection aluminum profile spraying pre-treatment process, the aluminum profile top hangs on the continuous conveying system, carries out various spraying pre-treatments in the conveying process, specifically comprises the following steps:

[0062] (1) Washing:

[0063] Clean the aluminum profile with tap water to remove dust and debris;

[0064] (2) Alkaline washing and degreasing:

[0065] Dissolve the degreasing agent in water to form a degreasing liquid, the concentration of the degreasing liquid is 1.8%, and spray the aluminum profile to remove oil. The degreasing agent includes the following components in parts by weight: 18 parts of sodium hydroxide, 10 parts of potassium, 1.5 parts of aluminum hydroxide, 4 parts of sodium gluconate, 4 parts of nitrous acid, 0.2 parts of sodium thiosulfate;

[0066] The degreasing liquid is recycled, and the ion concentration of the degreasing liquid is monitored and controlled within the followin...

Embodiment 3

[0084] A kind of green environmental protection aluminum profile spraying pre-treatment process, the aluminum profile top hangs on the continuous conveying system, carries out various spraying pre-treatments in the conveying process, specifically comprises the following steps:

[0085] (1) Washing:

[0086] Clean the aluminum profile with tap water to remove dust and debris;

[0087] (2) Alkaline washing and degreasing:

[0088] Dissolve the degreasing agent in water to form a degreasing liquid, the concentration of the degreasing liquid is 2%, and spray the aluminum profile to remove oil. The degreasing agent includes the following components in parts by weight: 20 parts of sodium hydroxide, 5 parts of potassium, 2 parts of aluminum hydroxide, 6 parts of sodium gluconate, 3 parts of sodium nitrite, 0.3 parts of sodium thiosulfate;

[0089] The degreasing liquid is recycled, and the ion concentration of the degreasing liquid is monitored and controlled within the following r...

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Abstract

The invention relates to the technical field of aluminum alloy processing, and provides an environment-friendly aluminum profile spraying pretreatment process. The process comprises the following steps of (1) washing; (2) alkali washing and oil removal, specifically, a degreasing agent is dissolved in water to be prepared into degreasing fluid, the degreasing fluid is sprayed to an aluminum profile for oil removal, and the degreasing fluid comprises, by weight, 15-20 parts of sodium hydroxide, 5-10 parts of potassium hydroxide, 1-2 parts of aluminum hydroxide, 4-6 parts of sodium gluconate, 3-5 parts of sodium nitrite and 0.1-0.3 part of sodium thiosulfate; (3) washing; (4) neutralizing; (5) washing; (6) washing with pure water; (7) chromate-free passivation; and (8) drying. The problems that a large amount of fluorine-containing and chromium-containing industrial waste residues are generated in an existing aluminum profile spraying pretreatment process, the treatment cost is high, and the environment and water resources are prone to being polluted are solved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a pre-treatment process for spraying of green and environment-friendly aluminum profiles. Background technique [0002] The traditional pre-treatment process of aluminum alloy profile spraying mainly adopts pickling and chromization process, and the pickling process has a good degreasing effect; after chromization treatment, a chromium film is formed on the surface of the aluminum profile, which has strong corrosion resistance. However, there are also certain deficiencies in the pickling and chromization process, which are specifically manifested in: first, the removal efficiency of ordinary acid on the oxide film on the surface of aluminum alloy is not high, and it cannot efficiently meet industrial production. Therefore, when producing degreasers, it is often Inorganic strong acid-hydrofluoric acid will be added to quickly react with aluminum alloy to improve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78C23C22/06C23G1/22
CPCC23C22/78C23C22/06C23G1/22
Inventor 黄长远朱耀辉叶细发
Owner FUJIAN MINFA ALUMINUM
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