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Hole-sealing method of micro-arc oxidation coating

A technology of micro-arc oxidation and oxide film, which is applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of destroying the ceramic texture of micro-arc oxidation film and difficult to achieve the sealing effect of micro-arc oxidation film, and achieve Good sealing effect

Inactive Publication Date: 2009-12-30
SHENZHEN FUTAIHONG PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different properties of the anodized film and the micro-arc oxidation film, the pore diameter is different (the pore diameter of the anodized film is nanometer, and the pore diameter of the micro-arc oxidation film is micron), it is difficult to imitate the sealing method of the anodized film. The arc oxidation film has a good sealing effect, and even destroys the unique ceramic texture of the micro-arc oxidation film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: An aluminum alloy micro-arc oxidation film is selected, and the surface roughness of the oxide film is 1.31 μm. The hydroxyacrylic polyurethane, hexamethylene 1,6 diisocyanate and isopropanol are uniformly mixed in a mass ratio of 3:1:2-4 and used as a sealing agent. The oxide film is spray-coated with the sealing agent, and then left at room temperature (20° C.) for 72 hours or baked at 70° C. for 4 hours to cure after spraying. After sealing, the thickness of the film layer formed by the sealing agent on the oxide film is about 2.5 μm, the surface roughness of the oxide film after sealing is 1.29 μm, and the hardness is 820 HV. The oxide film after sealing can pass the dirt resistance test.

Embodiment 2

[0010] Embodiment 2: An aluminum alloy micro-arc oxidation film is selected, and the surface roughness of the oxide film is 1.31 μm. The resorcinol bisphenol A type epoxy resin, melamine and isopropanol are uniformly mixed in a mass ratio of 3:1:1-2 and used as a sealing agent. The oxide film is spray-coated with the sealing agent, and then left at room temperature (20° C.) for 72 hours or baked at 80° C. for 1 hour to cure after spraying. After sealing, the thickness of the film layer formed by the sealing agent on the oxide film is about 2.5 μm, the surface roughness of the oxide film after sealing is 1.29 μm, and the hardness is 820 HV. The oxide film after sealing can pass the dirt resistance test.

[0011] The micro-arc oxidation film sealing method of the present invention is suitable for the micro-arc oxidation film formed on the surface of light metals such as aluminum alloy, magnesium alloy or titanium alloy.

[0012] The present invention uses the mixture containin...

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Abstract

The invention relates to a sealing method of a micro-arc oxidation coating. An oxide film is sealed by a mixture of polyurethane resin, epoxy resin and curing agent as a sealing agent in a spraying way; and the sealing agent forms a film layer on the surface of the oxide film after the hole sealing.

Description

technical field [0001] The invention relates to a hole sealing method of a micro-arc oxidation film. Background technique [0002] Micro-arc oxidation technology (also known as plasma oxidation, anodic spark deposition, spark discharge anodic deposition and surface ceramization, etc.) is a technology that can directly grow an oxide film with ceramic texture in situ on the metal surface. The ceramic oxide film formed by this technology has good appearance and high hardness, so it is widely used in the field of surface decoration of products. During the process of forming ceramic oxide film on the surface of metal workpiece by using this technology, the workpiece emits a large amount of gas due to high temperature sintering, and the gas passes through the oxide film formed on the surface of the workpiece when discharged, so that the oxide film forms many micropores. The existence of the many micropores makes it very easy for dirt to penetrate into the oxide film and is not ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C25D11/18
CPCC25D11/246C25D11/026C25D11/30C25D11/26
Inventor 戴丰源罗勇达何纪壮刘伟敖旭峰
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD
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