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Method for preparing thermal control coating with high sunlight absorptivity and high emittance on the surface of magnesium alloy

A technology of solar absorptivity and high emissivity, applied in anodizing and other directions, can solve problems such as the inability to meet the requirements of lightweight spacecraft structures and the heavy weight of aluminum alloy materials, to improve corrosion resistance, avoid corrosion, and bond strength. high effect

Active Publication Date: 2010-06-23
HARBIN INST OF TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims to solve the problem that the existing aluminum alloy materials used in spacecraft are heavy and cannot meet the requirements of lightweight spacecraft structures, and provide a method for preparing a thermal control coating with high solar absorption rate and high emissivity on the surface of magnesium alloy

Method used

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specific Embodiment approach 1

[0007] Specific embodiment one: the preparation method of the high solar absorptivity and high emissivity thermal control coating on the surface of the magnesium alloy of the present embodiment is carried out according to the following steps: 1. Magnesium alloy surface pretreatment: immerse the magnesium alloy at a concentration of 80g / L~ In 120g / L sodium hydroxide aqueous solution, keep at a temperature of 70°C to 90°C for 15min to 20min, after taking it out, rinse it with clean water, then rinse it with distilled water, and dry it; 2. Preparation of electrolyte: according to the main film forming agent The concentration is 20g / L-100g / L, the concentration of auxiliary film-forming agent is 1g / L-10g / L, the concentration of coloring additive is 10g / L-50g / L, the concentration of complexing agent is 20g / L-100g / L, PH The concentration of the regulator is 1g / L~5g / L. Weigh the main film-forming agent, auxiliary film-forming agent, coloring additive, complexing agent, PH regulator and...

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the magnesium alloy is immersed in an aqueous solution of sodium hydroxide with a concentration of 85g / L-115g / L, and kept at a temperature of 75°C-85°C for 16min ~19min. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the magnesium alloy is immersed in an aqueous solution of sodium hydroxide with a concentration of 100 g / L, and kept at a temperature of 80° C. for 18 minutes. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a thermal control coating with high sunlight absorptivity and high emittance on the surface of magnesium alloy, which relates to a method for preparing a thermal control coating, and solves the problem that the aluminum alloy material applied on the prior spacecraft can not meet the requirement on structure lightweighting of the spacecraft due to the heavy weight. The method comprises the following steps: firstly, pre-treating the surface of magnesium alloy; secondly, compounding main film forming agent, auxiliary film forming agent, color additive, complexing agent and pH conditioning agent into electrolyte; thirdly, adopting a micro-arc oxidation pulse power supply to provide power, and obtaining the thermal control coating with high sunlight absorptivity and high emittance on the surface of the magnesium alloy after reaction in a constant current mode. The sunlight absorptivity of the coating is 0.80-0.95, the infrared emittance is 0.80-0.90, and the weight is reduced by 28-33 percent than the weight of aluminum alloy. Therefore, the coating can be applied to spacecrafts.

Description

technical field [0001] The invention relates to a method for preparing a thermal control coating. Background technique [0002] In recent years, with the development of modern aerospace technology, spacecraft such as satellites and spacecraft have developed towards large-scale, high-precision and multi-functional aspects, and the payload of spacecraft has continued to increase. Therefore, higher requirements have been put forward for the lightweight structure of spacecraft. The material used for spacecraft is generally aluminum alloy, while the density of magnesium alloy is 1.73g / cm 3 , which is about 2 / 3 of the density of aluminum alloy, and the specific strength and specific stiffness of magnesium alloy are large, and it has good damping performance, and can withstand large impact and vibration loads. It is a development direction of future aerospace materials. However, when spacecraft such as satellites and spaceships work in space, they have to endure the alternating he...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 吴晓宏秦伟
Owner HARBIN INST OF TECH
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