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

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...