Preparation method for anode oxide film with high emissivity

An anodizing film and anodizing technology, applied in the direction of anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of reducing the stability of parts and large cracks, reducing flow marks, fast coloring, and improving the film layer. The effect of surface emissivity

Inactive Publication Date: 2016-12-14
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the increase in the thickness of the oxide film can increase the protective effect of the film layer, but in the space environment of alternating cold and heat, the thicker the film layer, the greater the probability of cracks, which reduces the stability of the part in the space environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Select an aluminum sheet made of 5A06, with a length of 100mm, a width of 50mm, and a thickness of 5mm, which is anodized and colored. Take the example of preparing 5L bath solution for each process.

[0057] (1) Pretreatment

[0058]1) Prepare a chemical degreasing solution with the concentration of sodium phosphate 50g / L, sodium carbonate 25g / L, add 250g sodium phosphate, 125g sodium carbonate, and water to the degreasing tank, and use it after the solution is fully dissolved. Put the aluminum sheet into the degreasing liquid to clean the oil stain on the surface, the temperature is 50°C, and the time is 15 minutes. After degreasing, put the test piece into running hot water to wash once, and then put it into running cold water to wash once.

[0059] 2) Prepare the alkali etching solution with a concentration of 30g / L sodium hydroxide, add 150g sodium hydroxide to the alkali etching tank, and the rest is water, and use it after the solution is fully dissolved. Put ...

Embodiment 2

[0070] Select an aluminum sheet made of 5A06, with a length of 100mm, a width of 50mm, and a thickness of 5mm, which is anodized and colored. Take the example of preparing 5L bath solution for each process.

[0071] (1) Pretreatment

[0072] 1) Prepare a chemical degreasing solution with a concentration of 60g / L sodium phosphate and 30g / L sodium carbonate, add 300g sodium phosphate, 150g sodium carbonate, and water to the degreasing tank, and use it after the solution is fully dissolved. Put the aluminum sheet into the degreasing liquid to clean the surface oil, the temperature is 60°C, and the time is 25min. After degreasing, put the test piece into running hot water to wash once, and then put it into running cold water to wash once.

[0073] 2) Prepare the alkali etching solution with a concentration of 40g / L sodium hydroxide, add 200g sodium hydroxide to the alkali etching tank, and the rest is water, and use it after the solution is fully dissolved. Put the degreased al...

Embodiment 3

[0084] Select an aluminum sheet made of 5A06, with a length of 100mm, a width of 50mm, and a thickness of 5mm, which is anodized and colored. Take the example of preparing 5L bath solution for each process.

[0085] (1) Pretreatment

[0086] 1) Prepare a chemical degreasing solution with a concentration of 70g / L sodium phosphate and 35g / L sodium carbonate. Add 350g sodium phosphate, 175g sodium carbonate and the rest to the degreasing tank, and use it after the solution is fully dissolved. Put the aluminum sheet into the degreasing liquid to clean the surface oil, the temperature is 70°C, and the time is 30min. After degreasing, put the test piece into running hot water to wash once, and then put it into running cold water to wash once.

[0087] 2) Prepare the alkali etching solution with a concentration of 50g / L sodium hydroxide, add 250g sodium hydroxide to the alkali etching tank, and the rest is water, and use it after the solution is fully dissolved. Put the degreased ...

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Abstract

The invention discloses a preparation method for an anode oxide film with the high emissivity, and belongs to the technical field of aluminum and aluminum alloy surface treatment. Through the method, the compact and uniform anode oxide film free of cracking can be provided. The method comprises the steps of (1) pretreatment, (2) anodizing, (3) chambering anodizing, (4) coloring pretreatment and (5) coloring. The anode oxide film prepared through a sulfuric acid-adipic acid anodizing process is small in thickness (about 5-7 microns), compact, uniform and low in porousity, cracks of the film due to spatial environment changes can be avoided, and the film cracking problem is solved. The anode oxide film prepared through the method is high in emissivity.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of aluminum and its aluminum alloy, and relates to a method for preparing a high-emissivity anodized film layer. Background technique [0002] The anodized thermal control coating on the surface of the spacecraft mainly includes bright anodized thermal control coating and black anodized thermal control coating. The former is to form a thin layer of oxide film transparent to sunlight on the surface of polished aluminum by using anodic oxidation process, while the aluminum surface of the substrate has a high reflectivity to sunlight. By controlling the thickness of the oxide film, it can be changed The reflectivity of the film layer, thereby adjusting the absorption / emission ratio of the film layer. The latter utilizes the porosity of the oxide film to absorb other substances to form an outer surface with a high absorption rate. After the oxide film is treated, its thermal radiation prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/10C25D11/16C25D11/14C25D11/24
CPCC25D11/08C25D11/10C25D11/14C25D11/16C25D11/24
Inventor 杨茗佳毕荣荣于美
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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