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

Active Publication Date: 2021-02-09
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing an electrolytic solution for micro-arc oxidation on the surface of magnesium alloys and a black coating. The electrolytic solution is not prone to precipitation during micro-arc oxidation and has high stability. It has a long service life; the electrolyte solution has high film-forming efficiency in the micro-arc oxidation process, and extreme discharge is not easy to occur during t

Method used

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

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Embodiment 1

[0043] The content of each component in the electrolyte solution used is as follows: the main coloring salt is 10g / L copper sulfate, the complexing agent is 5g / L sodium ethylenediamine tetramethylene phosphonate (EDTMPS), 5g / L sodium tartrate and 5g / L Sodium pyrophosphate, the main film-forming agent is 25g / L sodium silicate, the auxiliary film-forming agent is 15g / L potassium hydroxide and 10g / L potassium fluoride.

[0044] Preparation of electrolyte solution: Weigh 600ml of deionized water and pour it into a 2L beaker, first add 10g of copper sulfate, 5g of sodium ethylenediamine tetramethylene phosphonate (EDTMPS), 5g of sodium tartrate, and 5g of sodium pyrophosphate into the beaker, and use a magnetic Stir with a stirrer for 5 minutes; then add 25g of sodium silicate, 15g of potassium hydroxide, and 10g of potassium fluoride to the beaker in sequence, and stir for 5 minutes with a magnetic stirrer; make up the remaining amount of deionized water to 1L and stir again evenly...

Embodiment 2

[0050] The contents of each component in the electrolyte solution used are as follows: the main coloring salt is 10g / L copper pyrophosphate, the auxiliary coloring salt is 3g / L organic selenium, and the complexing agent is 3g / L sodium ethylenediamine tetramethylene phosphonate (EDTMPS ), 5g / L sodium tartrate and 3g / L sodium tripolyphosphate, the main film-forming agent is 25g / L sodium silicate, and the auxiliary film-forming agent is 15g / L potassium hydroxide, 10g / L potassium fluoride and 5g / L Sodium tetraborate, the stabilizer is 5g / L polyethylene glycol and 5g / L sodium lauryl sulfate, and the nano powder is 3g / L nano manganese dioxide and 3g / L nano graphene particles.

[0051] Preparation of electrolyte solution: Weigh 600ml of deionized water and pour it into a 2L beaker, first add 10g copper pyrophosphate, 3g organic selenium, 3g sodium ethylenediaminetetramethylene phosphonate (EDTMPS), 5g sodium tartrate, 3g sodium tripolyphosphate into the beaker, stirred with a magneti...

Embodiment 3

[0055] The contents of each component in the electrolyte solution used are as follows: the main coloring salt is 10g / L copper pyrophosphate, the auxiliary coloring salt is 5g / L cobalt acetate, and the complexing agent is 3g / L sodium polyphosphate, 6g / L sodium tartrate and 3g / L sodium ethylenediamine tetramethylene phosphonate (EDTMPS), the main film-forming agent is 25g / L sodium silicate, and the auxiliary film-forming agent is 5g / L potassium hydroxide, 10g / L potassium fluoride and 10g / L Sodium tetraborate, the stabilizer is 5g / L polyethylene glycol and 2g / L sodium lauryl sulfate, and the nano powder is 3g / L nano titanium dioxide and 3g / L nano cobalt oxide.

[0056] Preparation of electrolyte solution: Weigh 600ml of deionized water and pour it into a 2L beaker, first add 10g of copper pyrophosphate, 5g of cobalt acetate, 3g of sodium polyphosphate, 6g of sodium tartrate, and 3g of ethylenediamine tetramethylene phosphonate (EDTMPS) into the beaker, stirring continuously with ...

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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.

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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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/026C25D11/30
Inventor 崔学军莫格张颖君金永中汪雨婷黄鑫
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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