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Fluorine-free super-hydrophobic Zn-MOF composite coating on surface of magnesium alloy and preparation method thereof

A composite coating, magnesium alloy technology, applied in the surface reaction electrolytic coating, metal material coating process, coating and other directions, can solve the problem of reducing the corrosion resistance of the film layer

Active Publication Date: 2021-03-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the micro-arc discharge causes the formation of volcanic micropores on the surface, it provides a channel for the corrosive medium to contact with the magnesium alloy, resulting in a decrease in the corrosion resistance of the film.

Method used

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  • Fluorine-free super-hydrophobic Zn-MOF composite coating on surface of magnesium alloy and preparation method thereof
  • Fluorine-free super-hydrophobic Zn-MOF composite coating on surface of magnesium alloy and preparation method thereof
  • Fluorine-free super-hydrophobic Zn-MOF composite coating on surface of magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Magnesium alloy pretreatment

[0024] The magnesium alloy substrate is sequentially polished with 180#, 600#, 1000#, 1500# metallographic sandpaper, cleaned and dried. Then, at 60 °C, place in alkaline degreasing solution (20 g / L NaOH, 30 g / L NaOH 2 CO 3 , 20 g / L Na 3 PO 4 ) for 1 min, followed by ultrasonic cleaning with ethanol solution and deionized water for 10 min, and dried for use.

[0025] (2) Micro-arc oxidation treatment

[0026] Micro-arc oxidation is carried out in a silicate system using pulse voltage. At room temperature, the magnesium alloy after (1) is used as an anode, and a stainless steel sheet is used as a cathode. For oxidation treatment, set electrical parameters as follows: frequency 50 Hz, duty cycle 30%, termination voltage 220 V, micro-arc oxidation time 30 min; composition of micro-arc oxidation solution used in the process: 11 g / L NaOH, 5 g / L Na 2 SiO 3 , 8 g / L NaF, 4 g / L Na 2 B 4 o 7 , 1 g / L Na 2 WO 4 , 5mL / L C 3 h 8 o 3 ...

Embodiment 2

[0031] Example 2: The concentration of 2-methylimidazole in step (3) of Example 1 was set to 0.69 g, and other treatment methods were consistent with Example 1, and the water contact angle was 129.16°.

Embodiment 3

[0032] Example 3: The concentration of 2-methylimidazole in step (3) of Example 1 was set to 0.89 g, and other treatment methods were consistent with Example 1, and the water contact angle was 128.13°.

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Abstract

The invention discloses a fluorine-free super-hydrophobic Zn-MOF composite coating on the surface of a magnesium alloy and a preparation method thereof. The fluoride-free super-hydrophobic Zn-MOF composite coating on the surface of the magnesium alloy specifically comprises a micro-arc oxidation layer, a Zn-MOF layer and a stearic acid layer which are sequentially attached to the surface of the magnesium alloy. A magnesium alloy matrix is sequentially subjected to grinding and polishing, oil removal and ultrasonic cleaning, then micro-arc oxidation treatment is carried out, after a micro-arc oxidation film is formed on the surface of the magnesium alloy matrix, the micro-arc oxidation film is placed in a polytetrafluoroethylene reaction kettle for high-temperature and high-pressure reaction to form the Zn-MOF coating, and finally the Zn-MOF coating is treated with a low-surface-energy substance stearic acid, and the fluorine-free super-hydrophobic Zn-MOF composite coating on the surface of the magnesium alloy is obtained after drying. The method is simple in preparation process and free of fluorine, the composite coating and a magnesium alloy base material have good binding force,the composite coating can be evenly distributed on the surface of the magnesium alloy, the corrosion current density is low, the super-hydrophobic effect is achieved, and good corrosion resistance isshown.

Description

technical field [0001] The invention belongs to a corrosion-resistant superhydrophobic composite coating for metal materials, in particular to a fluorine-free superhydrophobic Zn-MOF composite coating on the surface of a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium and its alloys are ideal green engineering materials with many excellent properties, such as low density, excellent biocompatibility and degradability, high strength ratio, etc. It has broad application prospects in the fields of automobile, aerospace industry and electronic products. However, magnesium alloy is relatively active and has an extremely negative potential, which makes it susceptible to corrosion in humid air, which severely limits its large-scale application. In order to solve this problem, researchers have introduced many processing methods. Among the many coating preparation methods, micro-arc oxidation (MAO) is widely used. This is due to its satisfa...

Claims

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Application Information

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IPC IPC(8): C23C28/04C23G1/22C25D11/02C25D11/30C23C26/00
CPCC23C28/04C25D11/026C25D11/30C23C26/00C23G1/22
Inventor 尚伟蒋世权王东温玉清金苏丹
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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