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Method for preparing low-absorptance high-emissivity thermal control coating on magnesium alloy surface through micro-arc oxidation technology

A micro-arc oxidation and thermal control coating technology, applied in anodizing and other directions, can solve the problems of non-dense, poor corrosion resistance, uneven coating film, etc., and achieve good adhesion, good corrosion resistance, and film coating. Even and dense effect

Inactive Publication Date: 2016-03-30
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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Problems solved by technology

[0004] The problem solved by the present invention is that the coating layer produced by the existing technology is not uniform and dense, the bonding force with the substrate is not good, and the corrosion resistance is poor.

Method used

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  • Method for preparing low-absorptance high-emissivity thermal control coating on magnesium alloy surface through micro-arc oxidation technology

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Embodiment Construction

[0014] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

[0015] see figure 1 , the present invention prepares the method for low-absorption high-emission thermal control coating on the surface of magnesium alloy by micro-arc oxidation process and comprises the following steps:

[0016] Inspection before oxidation → organic solvent degreasing → chemical degreasing → hot water washing → pure water washing → micro-arc oxidation → cold water washing → pure water washing → drying → packaging.

[0017] The above-mentioned process steps are detailed as follows:

[0018] 1. Organic solvent degreasing: use aviation gasoline for degreasing, and then transfer to the next process after natural drying.

[0019] 2. Chemical degreasing: the process conditions are as follows:

[0020] Sodium carbon...

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Abstract

Te invention discloses a method for preparing a low-absorptance high-emissivity thermal control coating on a magnesium alloy surface through a micro-arc oxidation technology. The process flow of the method comprises detecting before oxidation, removing oil through an organic solvent, chemically removing oil, washing with hot water, washing with pure water, performing micro-arc oxidation, washing with cold water, washing with pure water, drying and packaging. In the micro-arc oxidation step, an electrolyte is composed of 10-15 g / L of sodium silicate, 2-5 g / L of potassium hydroxide, 0.5-2 g / L of sodium fluoride, 1-5 g / L of potassium hexafluorozirconate, and 1-10g / L of potassium tartrate hemihydrates; and the technology parameters comprise that the electric current density is 4-6 A / dm2, the frequency is 400-600 Hz, the duty ratio is 30-50%, the time is 60-90 min, and the temperature is 10-30 DEG C. Therefore, the obtained thermal control coating possesses the emissivity of 0.86 or more and solar absorptance of 0.35 or less, is uniform and dense, good in binding force with a matrix and good corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, in particular to a method for preparing a low-absorption and high-emission thermal control coating on the surface of a magnesium alloy through a micro-arc oxidation process and the emission thermal control coating. Background technique [0002] 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. Thermal control coating is one of the main measures in passive temperature control design, that is, thermal control coating is applied to the inner and outer surfaces of the spacecraft (including the inner and outer surfaces of instruments) to adjust the heat flow absorbed and radiated to achieve temperature control. [0003] In spacecraft, many structural parts and instrument structures use magnesium alloy as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 苏培博鞠鹏飞吴超翟运飞胡玉冰
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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