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Preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer

A micro-arc oxidation, magnesium alloy technology, applied in anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of affecting the stability of the solution system, high toxicity of metal oxides, polluting the environment and human body, etc. Corrosion, reduce direct contact, improve the effect of corrosion resistance

Active Publication Date: 2021-03-09
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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  • Preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer
  • Preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer
  • Preparation method of magnesium alloy micro-arc oxidation black super-hydrophobic film layer

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Grind the magnesium alloy to be treated to 1200# sandpaper, ultrasonically wash it in acetone for 1 min, and dry it for later use. Prepare the basic electrolyte first, add sodium silicate 8g / L, potassium fluoride 0.5g / L, and potassium hydroxide 2g / L sequentially in distilled water at room temperature. Take another beaker filled with 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, add the prepared coloring salt solution into the basic electrolyte at a volume ratio of 1:1, and stir evenly. Subsequently, with 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 voltage mode. Before the start of the micro-arc oxidation, set the electrical parameters, the forward voltage is 280V, the neg...

Embodiment 2

[0040] Grind the magnesium alloy to be treated to 1200# sandpaper, ultrasonically wash it in acetone for 1 min, and dry it for later use. Prepare the basic electrolyte first, add sodium silicate 10 / L, potassium fluoride 0.5g / L, and potassium hydroxide 3g / L in order in distilled water at room temperature. Take another beaker with distilled water and add the corresponding complexing agent potassium sodium tartrate 5g / L, stir and dissolve and add the coloring salt copper pyrophosphate 6g / L. Finally, add the prepared coloring salt solution into the basic electrolyte at a volume ratio of 1:1, and stir evenly. Subsequently, with 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 voltage mode. Before the start of the micro-arc oxidation, set the electrical parameters, the forward voltage is 300V, the negative voltag...

Embodiment 3

[0042] Grind the magnesium alloy to be treated to 1200# sandpaper, ultrasonically wash it in acetone for 1 min, and dry it for later use. Prepare the basic electrolyte first, add sodium silicate 12g / L, potassium fluoride 0.5g / L, and potassium hydroxide 4g / L sequentially in distilled water at room temperature. Take another beaker filled with distilled water and add the corresponding complexing agent potassium sodium tartrate 7g / L, stir and dissolve and add the coloring salt copper pyrophosphate 8g / L. Finally, add the prepared coloring salt solution into the basic electrolyte at a volume ratio of 1:1, and stir evenly. Subsequently, with 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 voltage mode. Before the start of the micro-arc oxidation, set the electrical parameters, the forward voltage is 250V, the neg...

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Abstract

The invention discloses a preparation method of a magnesium alloy micro-arc oxidation black super-hydrophobic film layer. The preparation method comprises the following steps that a coloring salt solution containing copper pyrophosphate and sodium potassium tartrate is mixed with a basic electrolyte taking silicate as a main salt, a magnesium alloy is taken as a matrix to be immersed into the electrolyte, and a black ceramic film is prepared on the surface of the magnesium alloy in a micro-arc oxidation mode; secondly, the black ceramic film is immersed into an aluminum nitrate nonahydrate solution, and LDH treatment is carried out; and finally, the obtained object is immersed into a lauric acid ethanol solution for modification and drying is carried out to obtain the magnesium alloy micro-arc oxidation black super-hydrophobic film layer. According to the preparation method, the micro-arc oxidation black ceramic film and super-hydrophobicity are combined to prepare the functionalized film layer, so that the corrosion resistance of the magnesium alloy is remarkably improved, meanwhile, the magnesium alloy has the properties of high light absorption rate, self-cleaning, pollution prevention and the like, and the application fields of the magnesium alloy and a micro-arc oxidation technology are broadened.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a method for preparing 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 all over the world, and have increasingly become ideal materials for modern industrial products. The production and research 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 restricting its popularization and application. In order to improve the performance of magnesium alloys and further expand the application fields of magnesium alloys, various surface treatment technologies are applied to the treatment of magnesium alloys. Among them, the micro-arc oxidation technology of in-situ growth ...

Claims

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Application Information

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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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