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Method for preparing heat control coating layer on surface of magnesium alloy

A technology of thermal control coating and magnesium alloy, which is applied in the direction of anodic oxidation, etc., can solve the problems of high quality of thermal control coating, and achieve the effect of non-loose coating, high specific strength, high strength and bonding force

Active Publication Date: 2010-06-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a thermal control coating on the surface of a magnesium alloy in order to solve the problem of high quality of the thermal control coating using aluminum alloy as the substrate

Method used

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specific Embodiment approach 1

[0007] Embodiment 1: In this embodiment, the preparation method of the thermal control coating on the surface of the magnesium alloy is realized according to the following steps: 1. Pretreatment of the surface of the magnesium alloy: the magnesium alloy is immersed in a sodium hydroxide solution with a concentration of 100g / L, and then Under the condition of 70℃~90℃, keep warm for 15~20 minutes, rinse with clean water 3~5 times, then rinse with distilled water 3~5 times, and dry; 2. Magnesium alloy micro-arc oxidation electrolyte configuration: magnesium alloy micro-arc oxidation The electrolyte is composed of sodium aluminate, borax, potassium hydroxide, complexing agent and coloring additives. The concentration of sodium aluminate in the magnesium alloy micro-arc oxidation electrolyte is 20g / L~80g / L, and the concentration of borax is 5g / L. L~20g / L, the concentration of potassium hydroxide is 1g / L~10g / L, the concentration of complexing agent is 20g / L~50g / L, the concentration o...

specific Embodiment approach 2

[0010] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the magnesium alloy described in step 1 is magnesium alloy AZ91D or magnesium alloy AM20. Others are the same as the first embodiment.

[0011] The thermal control coating obtained on the surface of the magnesium alloy by this embodiment is uniform, dense, and has high strength and bonding force. The solar absorption rate of the thermal control coating can reach 0.80-0.95, and the infrared emissivity can reach 0.80-0.90.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the complexing agent described in Step 2 is ethylenediamine or ethylenediaminetetraacetic acid. Others are the same as in the first or second embodiment.

[0013] The thermal control coating obtained on the surface of the magnesium alloy by this embodiment is uniform, dense, and has high strength and bonding force. The solar absorption rate of the thermal control coating can reach 0.80-0.95, and the infrared emissivity can reach 0.80-0.90.

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Abstract

The invention discloses a method for preparing a heat control coating layer on the surface of magnesium alloy, which relates to a method for preparing a heat control coating layer on the surface of alloy. The invention solves the problem of large mass of the heat control coating layer of aluminum alloy as a base body. The preparation method is realized according to the following steps of: preprocessing the surface of magnesium alloy; preparing magnesium alloy microarc oxidation electrolyte; adding the magnesium alloy microarc oxidation electrolyte into a microarc oxidation electrolytic bath; placing the preprocessed magnesium alloy into the magnesium alloy microarc oxidation electrolyte to be used as an anode; supplying power by a pulse microarc oxidation power supply to react for 5-40 minutes; then washing the surface of magnesium alloy with distilled water and drying to obtain the heat control coating layer on the surface of the magnesium alloy. The density of the magnesium alloy used by the invention is small, is just 1.73g / cm3 and is about two thirds of the density of the aluminum alloy. Compared with a method by adopting the aluminum alloy, the heat control coating layer obtained by the method reduces weight by 30 percent.

Description

technical field [0001] The invention relates to a method for preparing a thermal control coating on the surface of an alloy. Background technique [0002] In recent years, with the development of modern aerospace technology, military satellites have developed in terms of large-scale, high-precision and multi-function, and the payload of satellites has continued to increase, which has put forward higher requirements for the lightweight of satellite structures. Magnesium has low chemical stability and poor corrosion resistance, and its potential is the most negative among practical metals. Galvanic corrosion may occur when it is in contact with other metal connectors; the oxide film naturally formed by magnesium in the air is relatively low. Loose, poor wear resistance, can not play a protective role. Therefore, the substrate for preparing high-emissivity thermal control coating is mainly aluminum alloy. Currently, there are two types of high-emissivity thermal control coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 吴晓宏秦伟卢松涛王小东解卿
Owner HARBIN INST OF TECH
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