Preparation method of thermal-control and corrosion-resistant integrated film of magnesium-lithium alloy

Abstract

The invention discloses a preparation method of a thermal-control and corrosion-resistant integrated film of a magnesium-lithium alloy. The preparation method comprises the following steps: a thermal-control microarc oxidation film is prepared on the surface of the magnesium-lithium alloy; and the thermal-control microarc oxidation film is subjected to perfluoroalkyl surface modification. The prepared thermal-control and corrosion-resistant integrated film is good in thermal control effect, good in corrosion-resistant effect and uniform in density and has the good binding force with a substrate.

Description

technical field [0001] The invention relates to material surface treatment, in particular to a method for preparing a thermally controlled and corrosion-resistant integrated film layer of a magnesium-lithium alloy. Background technique [0002] Magnesium-lithium alloy is currently the metal material with the smallest density, and it has excellent specific strength and specific stiffness. In spacecraft, many structural parts and instrument structures use magnesium-lithium alloy as the raw material for processing. [0003] The thermal control system is one of the main systems of the spacecraft. The spacecraft generally adopts an isothermal thermal control design scheme, mainly passive control methods, supplemented by local active control measures. The thermal control coating is one of the main measures of the passive control method, that is, the thermal control coating is applied to the inner and outer surfaces of the spacecraft (including the inner and outer surfaces of the i...

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Problems solved by technology

In recent years, there have also been reports on the technology of achieving thermal control performance through micro-arc oxidation. However, the micro-arc oxidation film layer is a porous ceramic film layer. How to improve its corrosion resistance while ensuring its thermal control performance has not been reported yet.

Perfluorosilane surface modification is a chemical method to form a transparent organic film on the surface of the metal, which is usually used to prepare a super-hydrophobic film, but perfluorosilane is modified on the surface of the thermally controlled micro-arc oxidation film to improve Its corrosion resistance has not yet been reported