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Environment-friendly surface treatment method for aluminium profile before spray coating

A treatment method and front surface technology, applied in the direction of pretreatment surface, metal material coating process, device for coating liquid on the surface, etc. Short life and other problems, to achieve the effect of easy maintenance of production conditions, easy control of operation process and low production cost

Inactive Publication Date: 2007-05-30
TAISHAN CITY KAM KIU ALUMINUM EXTRUSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned chromium-free treatment method has the following defects in production and application: it is difficult to control the content of the main salt component, the bath is easily disturbed by impurities, and the service life of the bath is short, which indirectly leads to higher production costs.

Method used

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  • Environment-friendly surface treatment method for aluminium profile before spray coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Decontamination: According to the conventional aluminum metal surface decontamination process, for example, put the aluminum parts in 80 g / L sulfuric acid solution, and treat them at room temperature for 6 minutes.

[0019] Removal of natural oxide film: According to the conventional process of removing natural oxide film on the surface of aluminum metal, for example, put aluminum parts in 50 g / L sodium hydroxide solution and treat at 60 ° C for 10 minutes.

[0020] Pickling: According to the conventional aluminum metal surface pickling process, for example, put the aluminum parts in a 160 g / L nitric acid solution and treat it at room temperature for 5 minutes.

[0021] Sulfuric acid anodizing: use pre-treated clean aluminum parts as anodes, and immerse them in an electrolyte solution containing 180 g / L sulfuric acid and 5 g / L aluminum ions, with a working voltage of 13 volts and an electrolysis temperature of 22 °C for 22 minutes. Make the aluminum surface obtain an an...

Embodiment 2

[0025] Decontamination: According to the conventional aluminum metal surface decontamination process, for example, put the aluminum parts in 90 g / L sulfuric acid solution and treat them at room temperature for 5 minutes.

[0026] Removal of natural oxide film: According to the conventional process of removing natural oxide film on the surface of aluminum metal, for example, put aluminum parts in 60 g / L sodium hydroxide solution and treat at 55 ° C for 9 minutes.

[0027] Pickling: According to the conventional aluminum metal surface pickling process, for example, put the aluminum parts in 170 g / L nitric acid solution, and treat it at room temperature for 4 minutes.

[0028] Sulfuric acid anodizing: use pre-treated clean aluminum parts as anodes, and immerse them in an electrolyte solution containing 190 g / L sulfuric acid and 10 g / L aluminum ions, with a working voltage of 15 volts and an electrolysis temperature of 20°C for 18 minutes. Make the aluminum surface obtain an anodi...

Embodiment 3

[0032] Decontamination: According to the conventional aluminum metal surface decontamination process, for example, put the aluminum parts in 100 g / L sulfuric acid solution, and treat them at room temperature for 4 minutes.

[0033] Removal of natural oxide film: According to the conventional process of removing natural oxide film on the surface of aluminum metal, for example, put aluminum parts in 70 g / L sodium hydroxide solution and treat at 60 ° C for 8 minutes.

[0034] Pickling: according to the conventional aluminum metal surface pickling process, for example, put the aluminum parts in 180 g / L nitric acid solution, and treat it at room temperature for 3 minutes.

[0035] Sulfuric acid anodizing: use pre-treated clean aluminum parts as anodes, and immerse them in an electrolyte solution containing 200 g / L sulfuric acid and 15 g / L aluminum ions, with a working voltage of 18 volts and an electrolysis temperature of 18°C ​​for 15 minutes. Make the aluminum surface obtain an a...

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Abstract

The invention discloses an environment protective aluminium coating front-surface disposing method, which comprises the following steps: 1. cleaning oil on the working piece surface; 2. removing natural oxide film on the working piece surface; 3. acidifying; 4. oxidizing sulfuric acid anode; 5. washing; 6. drying.

Description

technical field [0001] The invention relates to a surface treatment process before metal spraying, in particular to a surface treatment of an aluminum material before spraying through aluminum anodic oxidation. Background technique [0002] At present, the surface treatment methods before aluminum spraying mainly include: phosphoric acid-chromate method, chromate method, chromium-free treatment method, etc. Phosphoric acid-chromate method and chromate method both use highly toxic substances such as hexavalent chromium, causing serious environmental pollution. With the restriction or prohibition of the use of hexavalent chromium by domestic and foreign environmental regulations, it is the development trend of aluminum processing technology to replace the chromium treatment with the green process of chromium-free treatment. [0003] At present, the chromium-free treatment method mainly uses some metals with good corrosion resistance: salts of zirconium, titanium, cobalt, moly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23G5/00C23G1/12C25D11/08B05D3/04
CPCC25D11/08
Inventor 刘一峥杨翠颜雷清和雷远明陶朝弟
Owner TAISHAN CITY KAM KIU ALUMINUM EXTRUSION
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