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CN-122013279-A - Nanoparticle modified electrolyte, application thereof, thermal control coating, preparation method of nanoparticle modified electrolyte and thermal control component

CN122013279ACN 122013279 ACN122013279 ACN 122013279ACN-122013279-A

Abstract

The application relates to the field of surface engineering, and discloses a nanoparticle modified electrolyte, application thereof, a thermal control coating, a preparation method thereof and a thermal control component. The electrolyte comprises silicate, phosphate, hydroxide and zirconium dioxide nano particles, wherein the concentration of the zirconium dioxide nano particles is 5-50 g/L, and the particle size is 20-50 nm. The application provides a zirconium dioxide nanoparticle modified micro-arc oxidation electrolyte, which realizes the thermal control performance of alpha S =0.24~0.28、ε H more than or equal to 0.85 through the filling, densification and optical interference effect of zirconium dioxide nanoparticles, simultaneously improves the neutral salt spray resistance to more than 96 hours, simultaneously realizes the precise regulation and control of thermal control parameters and the long-term blocking of corrosive media through a single ceramic layer, and meets the requirements of high-reliability service of the thermal control part in the whole life cycle.

Inventors

  • WEN CHEN
  • ZHANG ZISHUO
  • BAI JINGYING
  • YANG DONGCHENG
  • ZHONG JINGKANG
  • ZHAO KUO
  • LIU DONG
  • SHI SHAOHONG

Assignees

  • 北京星驰恒动科技发展有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The nanoparticle modified electrolyte is characterized by comprising silicate, phosphate, hydroxide and zirconium dioxide nanoparticles, wherein the concentration of the zirconium dioxide nanoparticles is 5-50 g/L, and the particle size is 20-50 nm.
  2. 2. The electrolyte of claim 1, comprising 30-60 g/L silicate, 3-10 g/L phosphate, 2-10 g/L hydroxide, 5-50 g/L zirconium dioxide nanoparticles.
  3. 3. The electrolyte of claim 1 or 2 wherein the silicate comprises sodium silicate, the phosphate comprises sodium dihydrogen phosphate, and the hydroxide comprises sodium hydroxide.
  4. 4. The electrolyte of claim 1, further comprising a dispersant selected from any one of sodium citrate, sodium dodecylbenzene sulfonate, and sodium dodecylsulfate.
  5. 5. Use of the electrolyte according to any one of claims 1-4 for the preparation of a micro-arc oxidation thermal control coating.
  6. 6. A thermal control coating formed by micro-arc oxidation of the electrolyte of any one of claims 1-4.
  7. 7. A method of preparing a thermal control coating as recited in claim 6, comprising: taking magnesium alloy as an anode and stainless steel plate as a cathode, placing the magnesium alloy into the electrolyte according to any one of claims 1-4 for micro-arc oxidation, and obtaining the thermal control coating on the surface of the magnesium alloy.
  8. 8. The method of claim 7, wherein the process parameters of the micro-arc oxidation include: a frequency of 500 to 1000Hz the duty ratio is 10-20%.
  9. 9. The method according to claim 7 or 8, wherein the micro-arc oxidation is performed with the aid of inert gas or compressed air introduced by a vacuum gas stirring system.
  10. 10. A thermal control component comprising a magnesium alloy substrate and a thermal control coating disposed on a surface of the magnesium alloy substrate, the thermal control coating comprising the thermal control coating of claim 6.

Description

Nanoparticle modified electrolyte, application thereof, thermal control coating, preparation method of nanoparticle modified electrolyte and thermal control component Technical Field The application relates to the field of surface engineering, in particular to nanoparticle modified electrolyte, application thereof, a thermal control coating, a preparation method thereof and a thermal control component. Background The spacecraft components need to be subjected to double tests of special storage environment and on-orbit heat alternation in the service period. Under coastal special storage environments, the concentration of chloride ions in the air is up to 5-10 mg/m 3, the relative humidity is over 85 percent, and when the magnesium alloy is stored for 3-6 months under the conditions, macroscopic pitting can occur, so that the performance safety of the component is affected. After entering the track, each track of the assembly experiences periodic temperature impact of +/-120 ℃, and if the solar absorption ratio alpha S of the thermal control coating is more than 0.30, the temperature drift of the structural member exceeds 30 ℃, so that the optical load precision and the service life of the electronic device are directly affected. Although the traditional micro-arc oxidation film layer can provide a certain hemispherical emissivity, the porosity is generally more than 8%, the microcrack density is high, a chloride ion rapid permeation channel is formed, and the service life of neutral salt fog is less than 24 hours. The existing composite coating improves the salt fog performance to 48 hours, but the organic hole sealing layer is embrittled and cracked after being subjected to thermal cycle for 2000 times at-150 ℃ to +150 ℃, and a new corrosion primary cell is formed at the interface, so that protection failure is caused. Disclosure of Invention Therefore, the application aims to provide the nanoparticle modified electrolyte, so that the thermal control performance of alpha S≤0.28、εH is more than or equal to 0.85 of the thermal control coating generated by micro-arc oxidation of the electrolyte is achieved, and the neutral salt fog resistance is obviously improved to be more than 96 hours. It is a further object of the present application to provide the use of the above-described electrolyte for the preparation of a thermal control coating; another object of the present application is to provide a thermal control coating prepared based on the above electrolyte and a method for preparing the same; it is another object of the present application to provide a thermal control member based on the above thermal control coating, so that the thermal control member has excellent properties brought by the above thermal control coating. In order to solve the technical problems or at least partially solve the technical problems, as a first aspect of the present application, a nanoparticle modified electrolyte is provided, which includes silicate, phosphate, hydroxide and zirconium dioxide nanoparticles, wherein the concentration of the zirconium dioxide nanoparticles is 5-50 g/L, and the particle size is 20-50 nm. Optionally, the electrolyte comprises 30-60 g/L silicate, 3-10 g/L phosphate, 2-10 g/L hydroxide and 5-50 g/L zirconium dioxide nano particles. Further alternatively, the silicate comprises sodium silicate, the phosphate comprises sodium dihydrogen phosphate, and the hydroxide comprises sodium hydroxide. Optionally, the electrolyte further comprises a dispersing agent, wherein the dispersing agent is selected from any one of sodium citrate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate. As a second aspect of the application, there is provided the use of said electrolyte for the preparation of a micro-arc oxidation thermal control coating. As a third aspect of the present application, there is provided a thermal control coating formed by micro-arc oxidation of the electrolyte of the present application. As a fourth aspect of the present application, there is provided a method for preparing the thermal control coating according to the present application, comprising: And taking magnesium alloy as an anode, taking a stainless steel plate as a cathode, placing the stainless steel plate into the electrolyte for micro-arc oxidation, and obtaining the thermal control coating on the surface of the magnesium alloy. Optionally, the technological parameters of the micro-arc oxidation include: a frequency of 500 to 1000Hz the duty ratio is 10-20%. Optionally, the micro-arc oxidation is assisted by introducing inert gas or compressed air through a vacuum gas stirring system. As a fifth aspect of the present application, there is provided a thermal control member comprising a magnesium alloy substrate and a thermal control coating layer provided on the surface of the magnesium alloy substrate, the thermal control coating layer comprising the thermal control coating layer of the present application. The applicat