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Method for preparing differential arc oxidation coating with high solar absorptivity and high emissivity

A technology of solar absorptivity and micro-arc oxidation, which is applied in the coating field, can solve problems such as the solar absorptivity, emissivity, and bonding force of aluminum alloy coatings, and achieve improved implementability, improved performance, and high hardness Effect

Active Publication Date: 2008-03-12
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the solar absorptivity, emissivity, and binding force of the current aluminum alloy coating cannot meet the requirements of aviation, aerospace, decoration and other fields; and to provide a high solar absorptivity and high emissivity micro-arc Preparation method of oxide coating

Method used

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  • Method for preparing differential arc oxidation coating with high solar absorptivity and high emissivity

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specific Embodiment approach 1

[0011] Specific Embodiment 1: The preparation method of the micro-arc oxidation coating in this embodiment is as follows: first, clean the aluminum alloy decorative plate, the thermal control part of the spacecraft or the surface of the precision optical device with acetone or water, and place it in a stainless steel electrolytic cell as an anode , the stainless steel electrolytic cell is used as the cathode, and the pulse micro-arc oxidation power supply is used for power supply, and the current density is controlled at 0.5-30A / dm 2 , the forward voltage is 240-1000V, the power supply frequency is 50-3000Hz, the duty cycle is 10-50%, the temperature of the electrolyte is controlled by cooling circulating water to not exceed 30°C, and the pH value of the electrolyte is controlled between 8-12. After arc oxidation reaction for 5-180 minutes, a layer of ceramic coating with high solar absorption rate and high emissivity can be grown in situ on the surface of aluminum alloy.

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specific Embodiment approach 2

[0014] Specific implementation mode 2: In this implementation mode, the current density is controlled at 10-25A / dm 2 . Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: In this embodiment, the forward voltage is 300-600V. Others are the same as in the first embodiment.

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Abstract

The invention provides a method for preparing a micro-arc oxidized coating with high solar absorptivity and high emissivity. The invention solves such a problem associated with prior Al-alloy coating that the solar-absorptivity, emissivity and bond, etc. can't meet the requirements from such fields as aerospace and decoration. The procedures are: placing a cleaned Al alloy in a stainless steel electrolytic tank as an anode, taking the stainless steel electrolytic tank as a cathode, supplying power by a pulse micro-arc oxidizing power supply, controlling the current density to be 0.5- 30A / dm<2>, positive voltage 240-1000 V, power supply frequency 50-3000 Hz, duty rate 10-50%, and controlling the electrolyte by a cooling circulating water to be no more than 30 DEG C, pH value of the electrolyte 8-12, carrying out micro-arc oxidization for 5-180 min., and then obtaining a ceramic coating. The invention reduces the cost and improves the product performance. The invention obtains a ceramic coating that has a solar absorptivity on Al alloy surface more than 0.90 and emissivity more than 0.80, in addition, the coating is of high hardness (more than 1000 Hv) and good bond with the substrate.

Description

technical field [0001] The invention relates to a coating method, in particular to a micro-arc oxidation ceramic coating with high solar absorption rate and high emissivity prepared on the surface of an aluminum alloy by using a micro-arc oxidation technology. technical background [0002] High solar absorptivity and high emissivity coatings, as an important class of thermal control coatings, are widely used in aviation, aerospace, decoration and other fields to control temperature and eliminate stray light. They have two important properties: high solar absorptivity (generally greater than 0.8) and higher emissivity (emissivity is generally greater than 0.8). At present, the high-absorption and high-emission coatings mainly used include two types: one is a coating based on anodized film obtained by anodic oxidation coloring or electrolytic coloring; the other is a binder plus black fuel (graphite, etc. ) mixed and applied to the surface of the substrate. Although these tw...

Claims

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Application Information

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IPC IPC(8): C25D11/04
Inventor 吴晓宏秦伟崔博姜兆华
Owner HARBIN INST OF TECH
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