Thermal control film on surface of magnesium lithium alloy, and preparation method of thermal control film

A magnesium-lithium alloy, thermal control film technology, applied in surface reaction electrolytic coating, coating, anodizing and other directions, can solve the problems of difficult implementation, low absorption, lack of thermal control coating preparation technology for magnesium-lithium alloy, etc. The effect of improved thermal control performance and excellent performance

Inactive Publication Date: 2019-03-29
BEIJING SATELLITE MFG FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used high-emissivity-low-absorption thermal control coating preparation technology is mainly used for aluminum alloys. Magnesium-lithium alloys lack the corresponding thermal control coating preparation technology, and spraying thermal control paint can meet the high emissivity-low absorption thermal control requirements. , but there is a risk of redundant
At the same time, the current product design has higher and higher requirements for radiation performance, and high emissivity (ε H ≥0.8), low absorption (δ S ≤0.3) is difficult to implement through conventional thermal control technology

Method used

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  • Thermal control film on surface of magnesium lithium alloy, and preparation method of thermal control film
  • Thermal control film on surface of magnesium lithium alloy, and preparation method of thermal control film
  • Thermal control film on surface of magnesium lithium alloy, and preparation method of thermal control film

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preparation example Construction

[0035] The method for preparing the magnesium-lithium alloy high-emission-low-absorption thermal control film layer of the present invention is carried out according to the following steps: pretreatment→installation→oxidation→cleaning→drying, specifically including the following steps:

[0036] Step (1), pretreatment: Use absolute ethanol or acetone to clean the surface of the magnesium-lithium alloy to remove oil stains and cutting fluids on the surface of the magnesium-lithium alloy parts; then put the magnesium-lithium alloy parts into the In sodium hydroxide aqueous solution, wash at a temperature of 80°C to 90°C for 1min to 3min, take it out, wash it with clean water and dry it;

[0037] Step (2), preparing the electrolyte: prepare the electrolyte required for oxidation according to the following ratio, place the prepared electrolyte in the stainless steel oxidation tank, use the magnesium-lithium alloy parts as the anode, and the stainless steel oxidation tank as the cath...

Embodiment 1

[0058] The preparation method of the high-emission-low-absorption thermal control coating of magnesium-lithium alloy parts is carried out according to the following steps: 1. Part surface pretreatment: use absolute ethanol or acetone to clean the surface of magnesium-lithium alloy parts, and remove oil stains and cutting fluids on the parts surface ; Then put the magnesium-lithium alloy parts into the sodium hydroxide aqueous solution with a concentration of 45g / L, wash them at a temperature of 85°C for 2 minutes, take them out, clean them with clean water, and dry them; 3 SiO 4 10g / L, potassium fluozirconate K 2 ZrF 6 15g / L, potassium fluoride KF 2g / L, potassium hydroxide KOH 2g / L, dissolve respectively; pour the above solution into the stainless steel oxidation tank and mix, use the parts as anode and the stainless steel oxidation tank as cathode, respectively in Φ3 Tap the M3 external thread at one end of the aluminum wire, tap the M3 internal thread on the magnesium-lit...

Embodiment 2

[0062] The preparation method of the high-emission-low-absorption thermal control coating of magnesium-lithium alloy parts is carried out according to the following steps: 1. Part surface pretreatment: use absolute ethanol or acetone to clean the surface of magnesium-lithium alloy parts, and remove oil stains and cutting fluids on the parts surface ; Then put the magnesium-lithium alloy parts into the sodium hydroxide aqueous solution with a concentration of 45g / L, wash them at a temperature of 85°C for 2 minutes, take them out, clean them with clean water, and dry them; 3 SiO 4 10g / L, potassium fluozirconate K 2 ZrF 6 15g / L, potassium fluoride KF 2 1g / L, potassium hydroxide KOH 2 Dissolve 1g / L separately; pour the above solution into the stainless steel oxidation tank and mix, use the part as the anode and the stainless steel oxidation tank as the cathode, respectively tap the M3 external thread on one end of the Φ3 aluminum wire, and tap the M3 internal thread on the m...

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Abstract

The invention relates to thermal control film on the surface of magnesium lithium alloy, and a preparation method of the thermal control film. According to the preparation method, because a micro-arcoxidation electrolyte system suitable for the magnesium lithium alloy is built on the basis of a lot of solution screening experiments, electrical parameters matched with the solution system are created on the basis of a lot of electrical parameter optimization tests, the binding force of the film prepared on the surface of the magnesium lithium alloy is guaranteed, and the composition of the filmis changed by doping the electrolyte with zirconium salt, then remarkable improvement on thermal control performance of the film is achieved, and the thermal control film meeting the requirements forthermal control of a spacecraft product is prepared on the surface of the magnesium lithium alloy finally. According to the thermal control film on the surface of the magnesium lithium alloy, a micro-arc oxidation technology is adopted, the magnesium lithium alloy is used as a substrate, one layer of ceramic film grows on the surface of the magnesium lithium alloy in an in-situ manner, the film is doped with the zirconium oxide with good thermal control performance, infrared emittance of the film ranges from 0.80 to 0.90, the solar absorptance ranges from 0.20 to 0.30, the part dimensions andthe assembly accuracy of the magnesium lithium alloy are not affected, and the film can be applied to spacecrafts instead of organic coatings.

Description

technical field [0001] The invention relates to a thermal control coating on the surface of a magnesium-lithium alloy and a preparation method thereof, in particular to a high-emission-low-absorption thermal control coating applied to the surface of casing structural parts such as electronic products and secondary power supplies on spacecraft The invention relates to a preparation method of a device, which belongs to the technical field of thermal control materials. Background technique [0002] Magnesium-lithium alloy has a series of advantages such as low density, high specific strength and specific stiffness, good machinability, and good vibration damping performance. Its density is about 1.459 / cm 3 , is currently the lightest metal structure material. The same structural product is processed with different metal materials. The weight of magnesium-lithium alloy structural products is about 18% lighter than magnesium alloy products, and about 46% lighter than aluminum all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/024C25D11/026C25D11/30
Inventor 曹克宁李思振刘云彦李家峰程德白晶莹张立功王旭光杨铁山姚雪征
Owner BEIJING SATELLITE MFG FACTORY
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