Preparation method of titanium alloy surface coating with low solar absorptivity and high emissivity

A technology with high solar absorptivity and high emissivity, applied in the direction of surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve problems such as low emissivity, high solar absorptivity, poor bonding and thermal stability, and achieve solar High absorption rate, uniform surface, good binding effect

Active Publication Date: 2013-07-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of high solar absorptivity and low emissivity of titanium alloy materials, and poor bonding force and thermal stability with the substrate, and provides a method for preparing a coating with low solar absorptivity and high emissivity on the surface of titanium alloy

Method used

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  • Preparation method of titanium alloy surface coating with low solar absorptivity and high emissivity
  • Preparation method of titanium alloy surface coating with low solar absorptivity and high emissivity
  • Preparation method of titanium alloy surface coating with low solar absorptivity and high emissivity

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specific Embodiment approach 1

[0015] Embodiment 1: In this embodiment, a method for preparing a coating with low solar absorptivity and high emissivity on the surface of a titanium alloy is specifically prepared according to the following steps:

[0016] 1. Polish the surface of the titanium alloy with sandpaper, and then clean the surface of the titanium alloy with acetone;

[0017] 2. Put the cleaned titanium alloy in the electrolyte of the stainless steel electrolytic cell, the titanium alloy is used as the 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 1A / dm 2 ~20A / dm 2 , The forward voltage is 200V-800V, the power frequency is 50Hz-3000Hz, the duty cycle is 10%-50%, the temperature of the electrolyte does not exceed 40°C, and the pH value of the electrolyte is 8-13 under the condition of micro-arc oxidation React for 5 minutes to 60 minutes, grow a layer of ceramic coating with lo...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 2, the main film-forming agent is silicate, and the auxiliary film-forming agent is phosphate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 in that: in step 2, the concentration of the film-forming agent is 6g / L-18g / L, and the concentration of the auxiliary film-forming agent is 0.5g / L-15g / L. Others are the same as in the first embodiment.

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Abstract

The invention relates to a preparation method of a titanium alloy surface coating with low solar absorptivity and high emissivity, and relates to a preparation method of a titanium alloy surface coating. The titanium alloy surface coating provided by the invention is used for solving the problems of high solar absorptivity, low emissivity and poor binding force with a substrate and thermal stability of the titanium alloy material. The preparation method comprises the following steps of: 1, polishing and cleaning titanium alloy; and 2, carrying out micro-arc oxidation. The coating prepared by the invention is white or grey white in appearance, uniform and attractive; the thickness of the coating is up to 30-120 mu m and can be adjusted; due to in-situ growth, the coating has good binding force and thermal shock resistance; furthermore, the solar absorptivity is 0.35-0.6; the emissivity is 0.8-0.95; the coating is a thermal control coating with low solar absorptivity and high emissivity and is good in performance; and the preparation method disclosed by the invention is used for preparing the titanium alloy surface coating with low solar absorptivity and high emissivity.

Description

technical field [0001] The invention relates to a preparation method of a titanium alloy surface coating. Background technique [0002] With the development of the aerospace industry, the requirements for spacecraft are getting higher and higher. Titanium alloys are more and more used as structural materials and skin materials due to their unique advantages, and are widely used in spacecraft. When the aircraft is in orbit, because it has to be in the alternating changes of solar radiation and shady side for a long time, when it is exposed to solar radiation, the maximum temperature reaches 200°C, and the stress caused by excessive temperature is not conducive to the normal operation of internal precision instruments. Therefore, when the aircraft is irradiated by the sun, the heat should be dissipated as quickly as possible to reduce the surface temperature and provide guarantee for the normal operation of the instrument. However, due to the low emissivity of titanium alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 姚忠平牛翱翔沈巧香胡冰姜兆华
Owner HARBIN INST OF TECH
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