The invention provides a preparation method of an aluminum alloy surface conductive thermal control coating with low solar absorptivity and high emissivity, and relates to the preparation method of the aluminum alloy surface conductive thermal control coating. The preparation method aims at solving the technical problems that a conductive thermal control coating integrated film meeting the requirements of space ultraviolet radiation and electron radiation cannot be prepared with the existing aluminum alloy surface treatment technology. The method includes the steps of 1, surface pre-treatmentof an aluminum alloy part; 2, preparation of electrolyte; 3, pulse micro-arc oxidation; and 4, magnetron sputtering. The thickness of the prepared aluminum alloy surface conductive thermal control coating with low solar absorptivity and high emissivity is 20-100 micrometers, and the roughness of the prepared aluminum alloy surface conductive thermal control coating with low solar absorptivity andhigh emissivity is 2.0-12.0 micrometers; and the solar absorptivity is 0.35-0.42, the emissivity is 0.88-0.92, the value of alpha s/epsilon is about 0.4, the surface resistivity is 1*10 Ohm.cm, the dual requirements of thermal control and static resistance of spacecrafts are met, and the conductive thermal control coating can be used for spacecraft structures.

Preparation method of aluminum alloy surface conductive thermal control coating with low solar absorptivity and high emissivity

The invention provides a preparation method of an anodic oxide film. The preparation method comprises the following steps of immersing a metal workpiece into a solution containing colloidal particles for anodic oxidation treatment so as to form an anodic oxide film with a plurality of membrane pores on a colored surface of the metal workpiece, and filling colloidal particles into at least part of the membrane pores, wherein the colloidal particles are used for carrying out diffuse reflection on incident light which is injected into the anodic oxide film, so that the anodic oxide film is white. According to the preparation method, the white oxide film with better texture can be formed, the preparation steps are simple, and the efficiency is high.

Preparation method of anode oxide film

The invention provides an aluminum member and a manufacturing method thereof. The aluminum member can obtain high whiteness only through simple and convenient one-time treatment compared with prior art. The aluminum member comprises a base material made of aluminum or art aluminum alloy, and an anodized coating provided on a surface of the base material and having a thickness of 100 [mu]m or less.The anodized coating comprises a barrier layer formed on the surface of the base material and having a thickness of 10 to 150 nm, and a porous layer formed on the barrier layer and having a thicknessof 6 [mu]m or more. The porous layer comprises a first pore extending in a thickness direction of the porous layer from a boundary between the porous layer and the barrier layer, and a second pore connected to the first pore and extending so as to branch radially in the thickness direction of the porous layer toward a surface of the porous layer.

Aluminum member and manufacturing method therof

An aluminum member comprises a base material made of aluminum or art aluminum alloy, and an anodized coating provided on a surface of the base material and having a thickness of 100 μm or less The anodized coating comprises a barrier layer formed on the surface of the base material and having a thickness of 10 to 150 nm, and a porous layer formed on the barrier layer and having a thickness of 6 μm or more The porous layer comprises a first pore extending in a thickness direction of the porous layer from a boundary between the porous layer and the barrier layer, and a second pore connected to the first pore and extending so as to branch radially in the thickness direction of the porous layer toward a surface of the porous layer

Aluminum member and method of manufacturing the same

The invention relates to a preparation process of an acid-corrosion-resistant functional ceramic membrane for the aluminium-alloy surface. The preparation process comprises the following steps: (1) polishing, cleaning and drying an aluminium-alloy substrate to obtain a pretreated aluminium-alloy substrate; (2) placing the pretreated aluminium-alloy substrate in pretreating liquid for treatment, cleaning and drying to obtain pretreated aluminium-alloy substrate; (3) preparing micro-arc oxidation electrolyte solution adding basic electrolyte, functional electrolyte and pH-value regulator into deionized water, and after uniformly mixing, obtaining the micro-arc oxidation electrolyte solution with the pH value of 11-13; (4) adopting the aluminium-alloy substrate as a positive electrode and stainless steel as a negative electrode, soaking the pretreated aluminium-alloy substrate in the micro-arc oxidation electrolyte solution, starting circulating cooling, adopting an alternating-current bipolar pulse power supply to carry out micro-arc oxidation treatment, taking out an aluminium-alloy sample after completion, using water for washing, and drying. The treatment process is simple, and the prepared functional ceramic membrane with micro-arc oxidation of aluminium alloy is uniform and dense, the structure components are controllable and the stability in the acid environment is good.

Preparation process of acid-corrosion-resistant functional ceramic membrane for aluminium-alloy surface

The invention discloses a preparation method of a white aluminum alloy surface thermal control coating with a high solar reflectance. The preparation method lies in that during the micro-arc oxidation preparation process, a mixture of one or more of sodium silicate, trisodium phosphate and sodium aluminate, of which the concentration is 2-50 g/L, is adopted as a film-forming agent in the used micro-arc oxidation electrolyte; potassium fluozirconate of which the concentration is 2-30 g/L is adopted as a coloring agent; a mixture of one or more of sodium sulfate, sodium acetate and sodium hypophosphite of which the concentration is 1-15 g/L is adopted as a stabilizer; a mixture of one or more of oxalic acid, cinnamic acid, citric acid and lactic acid is adopted as a PH regulating agent; the PH value of the electrolyte is maintained within the range of 3-6; deionized water is adopted as a solvent; the dosage of all the substances is calculated on the basis of the volume of the added deionized water; the frequency of a pulsed power supply is 50-2000 Hz; the duty ratio is 5-45%; the electric current density is 1-12 A/dm[2]; the reaction time is 20-180 min. The white aluminum alloy surface thermal control coating prepared by adopting the preparation method has a high solar reflectance.

Li Qingbiao

Papers

Preparation method of white aluminum alloy surface thermal control coating with high solar reflectance