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A kind of preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer

A technology of micro-arc oxidation and magnesium alloy, which is applied in the direction of anodic oxidation, coating, surface reaction electrolytic coating, etc., can solve the problems of affecting the stability of the solution system, the toxicity of metal oxides, and polluting the environment and human body, so as to improve the durability corrosion resistance, low energy consumption per unit, and improved blackness

Active Publication Date: 2022-08-05
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on micro-arc oxidation coloring technology at home and abroad is still in its infancy. Although black micro-arc oxidation films can be prepared on magnesium alloys, there are still the following problems: First, the corrosion resistance of black micro-arc oxidation films, combination Performance such as force needs to be improved. For example, when the voltage or current is too high, the film quality is poor and the corrosion resistance is not high. Oxides are highly toxic, not only causing some pollution to the environment, but also affecting the stability of the solution system
At present, modifiers commonly used to reduce surface free energy during superhydrophobic modification, such as fluorine-containing resins and siloxanes, are expensive, pollute the environment, and are harmful to the human body. Superhydrophobic film layer is an urgent problem to be solved

Method used

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  • A kind of preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer
  • A kind of preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer
  • A kind of preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer

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Embodiment 1

[0038] The magnesium alloy to be treated was ground to 1200# sandpaper, ultrasonically washed in acetone for 1 min, and dried for use. The basic electrolyte was prepared first, and 8g / L of sodium silicate, 0.5g / L of potassium fluoride and 2g / L of potassium hydroxide were sequentially added to distilled water at room temperature. In addition, take a beaker containing distilled water and add the corresponding complexing agent potassium sodium tartrate 8g / L, stir and dissolve, and add the coloring salt copper pyrophosphate 10g / L. Finally, the prepared coloring salt solution was added to the basic electrolyte in a volume ratio of 1:1, and stirred evenly. Subsequently, using the magnesium alloy as the anode and the stainless steel plate as the cathode, the dried magnesium alloy is immersed in the electrolyte, and the magnesium alloy is subjected to micro-arc oxidation treatment in a constant pressure mode. Before the start of micro-arc oxidation, set the electrical parameters, the...

Embodiment 2

[0040] The magnesium alloy to be treated was ground to 1200# sandpaper, ultrasonically washed in acetone for 1 min, and dried for use. First prepare the basic electrolyte, add 10 / L sodium silicate, 0.5 g / L potassium fluoride, and 3 g / L potassium hydroxide in sequence to distilled water at room temperature. Another beaker containing distilled water was added to the corresponding complexing agent potassium sodium tartrate 5g / L, and after stirring and dissolving, the coloring salt copper pyrophosphate 6g / L was added. Finally, the prepared coloring salt solution was added to the basic electrolyte in a volume ratio of 1:1, and stirred evenly. Subsequently, using the magnesium alloy as the anode and the stainless steel plate as the cathode, the dried magnesium alloy is immersed in the electrolyte, and the magnesium alloy is subjected to micro-arc oxidation treatment in a constant pressure mode. Before the micro-arc oxidation starts, set the electrical parameters, the forward voltag...

Embodiment 3

[0042] The magnesium alloy to be treated was ground to 1200# sandpaper, ultrasonically washed in acetone for 1 min, and dried for use. The basic electrolyte was prepared first, and 12 g / L of sodium silicate, 0.5 g / L of potassium fluoride, and 4 g / L of potassium hydroxide were sequentially added to distilled water at room temperature. Another beaker containing distilled water was added to the corresponding complexing agent potassium sodium tartrate 7g / L, and after stirring and dissolving, the coloring salt copper pyrophosphate 8g / L was added. Finally, the prepared coloring salt solution was added to the basic electrolyte in a volume ratio of 1:1, and stirred evenly. Subsequently, using the magnesium alloy as the anode and the stainless steel plate as the cathode, the dried magnesium alloy is immersed in the electrolyte, and the magnesium alloy is subjected to micro-arc oxidation treatment in a constant pressure mode. Before the micro-arc oxidation starts, set the electrical pa...

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Abstract

The invention discloses a method for preparing a black super-hydrophobic film layer by micro-arc oxidation of magnesium alloy. First, a coloring salt solution containing copper pyrophosphate and potassium sodium tartrate is mixed with a basic electrolyte containing silicate as the main salt, and a magnesium alloy In order to immerse the substrate in the electrolyte, a black ceramic film was prepared on the surface of the magnesium alloy by micro-arc oxidation; secondly, the black ceramic film was immersed in aluminum nitrate nonahydrate solution for LDH treatment; finally, it was immersed in lauric acid ethanol solution for modification and drying. That is, a black super-hydrophobic film layer of magnesium alloy micro-arc oxidation is obtained. The invention combines the micro-arc oxidation black ceramic film with the super-hydrophobicity to prepare the functionalized film layer, which not only significantly improves the corrosion resistance of the magnesium alloy, but also has the properties of high light absorption rate, self-cleaning, anti-fouling and the like, and broadens the scope of the magnesium alloy. And the application field of micro-arc oxidation technology.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a preparation method of a magnesium alloy micro-arc oxidation black super-hydrophobic film layer. Background technique [0002] The development and application of magnesium alloy materials characterized by light weight and recyclability have attracted more and more attention from countries all over the world, and have increasingly become an ideal material for modern industrial products. The production and development of magnesium alloys has developed rapidly in my country in recent years, but the poor corrosion resistance of magnesium alloys has always been the main reason that restricts its popularization and application. In order to improve the properties of magnesium alloys and further expand the application field of magnesium alloys, various surface treatment technologies are applied to the treatment of magnesium alloys. Among them, the micro-arc oxidation technology o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/14C25D11/06C25D11/24
CPCC25D11/14C25D11/06C25D11/24
Inventor 周根树王梦杰周凡
Owner XI AN JIAOTONG UNIV
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