Preparation method of black thermal control coating on surface of light alloy

A thermal control coating and light alloy technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of narrow application range of preparation process, unfavorable application of lightweight structural materials, and cumbersome preparation process, etc. Achieve the effect of solving process complexity and process stability, wide application range and high blackness
CN109280949AActive Publication Date: 2019-01-29LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2019-01-29

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Abstract

The invention relates to a preparation method of a black thermal control coating on the surface of a light alloy. The method comprises the following steps that (1) after being ground, a light alloy sample is cleaned and dried to obtain the treated light alloy sample; (2) a micro-arc oxidation electrolyte is prepared, wherein a film forming agent, a coloring agent, a stabilization agent and a pH value adjusting agent are added into deionized water, and after even mixing, the micro-arc oxidation electrolyte with the pH value ranging from 9 to 13 is obtained; and (3) one kind of metal in an aluminum alloy, a magnesium alloy and a titanium alloy is adopted as an anode, stainless steel is adopted as a cathode, the treated light alloy sample is soaked in the micro-arc oxidation electrolyte, circulation cooling is started, the treated light alloy sample is subjected to micro-arc oxidation treatment through a bipolar pulse power source, and after micro-arc oxidation treatment is completed, thesample is taken out and is washed with water and dried. According to the preparation method, universality and stability are good, the prepared micro-arc oxidation black thermal control coating on thesurface of the light alloy has high solar high absorbability and emissivity, and the preparation method can be widely applied to high-absorbability and high-emissivity spaceflight thermal control coatings.
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Description

technical field

[0001] The invention relates to the technical field of metal surface treatment, in particular to a method for preparing a black thermal control coating on the surface of a light alloy. Background technique

[0002] Light metals generally refer to metallic materials with a relative density less than 5. They are divided into non-ferrous light metals and rare light metals. Non-ferrous light metals include aluminum, magnesium, calcium, titanium, potassium, strontium, barium, etc. Rare light metals include lithium, beryllium, rubidium, cesium, etc., among which Aluminum, magnesium, and titanium are rich in resources due to their low relative density and high strength (in the earth's crust, the contents of aluminum, magnesium, and titanium are 8.0%, 2.5%, and 0.61%, respectively, accounting for the first and third in the reserves of metal elements , 4 digits), excellent overall performance and other characteristics as lightweight structural materials (mainly referr...

Claims

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