Electrolyte solution for magnesium alloy surface micro-arc oxidation and preparation method of black coating

An electrolytic solution and micro-arc oxidation technology, applied in surface reaction electrolytic coatings, electrolytic coatings, coatings, etc., can solve the problems of strong adhesion to magnesium alloy substrates, low surface roughness of coatings, and high blackness of black coatings , to achieve the effect of high hardness, elimination of local defects and high impedance
CN112342591AActive Publication Date: 2021-02-09SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
Publication Date
2021-02-09

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Abstract

The invention discloses an electrolyte solution for magnesium alloy surface micro-arc oxidation and a preparation method of a black coating. The electrolyte solution is prepared from a main film-forming agent, an auxiliary film-forming agent, main coloring salt, a complexing agent and deionized water; the main coloring salt is metal copper salt; the complexing agent is composed of condensed phosphate, organic phosphonate and tartrate; in the electrolyte solution, the content of the main film-forming agent is 5-50 g / L, the content of the auxiliary film-forming agent is 1-30 g / L, and the contentof the main coloring salt is 1-20 g / L; and the contents of various complexing agents can be compounded at 1-20 g / L. The electrolyte solution is not prone to precipitating in the micro-arc oxidation process, high in stability and long in service life; electrical parameters can be regulated and controlled in a large range, extreme discharge is not prone to occurring, and the film forming efficiencyis high; and the black coating prepared from the electrolyte solution is high in blackness, small in color difference, low in surface roughness, high in hardness, good in corrosion resistance, high in adhesive force, not prone to discoloring and excellent in thermal control performance.
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Description

technical field

[0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation method of an electrolyte solution and a black coating for micro-arc oxidation on the surface of a magnesium alloy. Background technique

[0002] Magnesium alloy, as the lightest metal in practical use, has broad application prospects in aerospace, weaponry, optoelectronic devices, 3C and other fields. However, in order to meet the service requirements of magnesium alloy products, it is necessary to prepare a layer of black coating on its surface. For example, the surface of the lens barrel of the optical device for deep space exploration needs to prepare a black coating with high absorption rate and low reflectivity to improve the measurement. Accuracy; space vehicle (satellite, spaceship, etc.) surface needs to prepare suitable solar light absorption rate (α s ) / emissivity (ε) ratio of black thermal control coating to ensure its normal ...

Claims

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