Low absorption-radiation ratio thermal control coating on magnesium alloy surface and preparation method thereof

Abstract

The invention relates to a low absorption-radiation ratio thermal control coating on the surface of a magnesium alloy and a preparation method thereof, which belongs to the technical field of spacecraft thermal control coatings and is used to solve the problem of temperature control of spacecraft exposed to extraterrestrial magnesium alloy components. The coating of the present invention is prepared by plasma electrolytic oxidation. The components of the electrolytic solution used include 1-15 g / l of soluble silicate, 1-5 g / l of soluble hydroxide, 1-5 g / l of soluble fluoride, and 1-20 g / l of zinc oxide particles. The oxidation process of magnesium alloy was controlled by AC pulse power supply. The solar absorption ratio (in the solar radiation interval of 250-2500nm) of the magnesium alloy surface of the present invention is 0.4-0.44, and the hemispherical infrared radiation rate is greater than 0.4, and the solar absorption ratio is equal to the hemispherical infrared radiation rate. The ratio is less than 1. The coating is composed of magnesium oxide, magnesium silicate, zinc oxide and γ-alumina, which can adapt to the processing of the surface of parts with more complex structures, has high bonding strength with the substrate, and the coating has good spatial stability.

Description

Low absorption-radiation ratio thermal control coating on magnesium alloy surface and preparation method thereof technical field The invention relates to a low-absorption-radiation ratio thermal control coating on the surface of a magnesium alloy and a preparation method thereof, in particular to a low-absorption-radiation ratio thermal control coating on the surface of an external magnesium alloy part of a spacecraft and a preparation method thereof, belonging to the spacecraft thermal control coating. control coating technology field. Background technique The specific gravity of magnesium alloy is 1 / 4 of that of steel and 2 / 3 of that of aluminum. Its specific strength and specific stiffness exceed other metals, and it also has the characteristics of low elastic modulus and good vibration damping. With the development of my country's large-scale spacecraft and deep space exploration technology, magnesium alloy materials will replace aluminum alloys and be widely used in t...

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Problems solved by technology

The purpose of the present invention is to propose a kind of magnesium alloy surface low absorption-radiation ratio thermal control coating and its preparation method in order to solve the above-mentioned problems, to solve the problem of thermal control of magnesium alloy parts for external use in spacecraft

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