Method for preparing superhydrophobic film on magnesium alloy surface

A magnesium alloy, super-hydrophobic technology, which is applied to the device for coating liquid on the surface, the pretreatment surface, the coating process of metal materials, etc., can solve the problems of complex preparation process, operator and environmental hazards, and achieve simple processing , improve the corrosion resistance, the preparation process is easy to achieve the effect

Inactive Publication Date: 2015-04-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process of superhydrophobic surface reported in the past, some processes use relatively expensive equipment, and some processes use some strong acids in the preparation process, which will generate irritating gas during the reaction process, which is

Method used

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  • Method for preparing superhydrophobic film on magnesium alloy surface
  • Method for preparing superhydrophobic film on magnesium alloy surface
  • Method for preparing superhydrophobic film on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The material is AZ91 magnesium alloy plate, which is put into the pre-prepared solution after surface treatment, and a layer of hydrotalcite-like rough surface with micro / nano multi-level structure is grown on the surface of the magnesium alloy by hydrothermal method, and then after low surface free It can be modified to obtain a super-hydrophobic surface, specifically including the following steps and process conditions:

[0026] (1) Surface pretreatment of AZ91 magnesium alloy: use 400, 800, and 1500 mesh SiC sandpaper to polish the magnesium alloy substrate in sequence to remove oxides and burrs on the surface of the magnesium alloy; rinse the surface of the polished magnesium alloy sample with deionized water, and Put the rinsed magnesium alloy sample in acetone and ultrasonically clean it for 15 minutes, take it out, clean it with absolute ethanol, dry the surface of the sample with a hair dryer, and put it in a drying dish for use.

[0027] (2) Preparation of reac...

Embodiment 2

[0032] Embodiment 2 The method for preparing a superhydrophobic film layer on the surface of a magnesium alloy is basically the same as that of Embodiment 1, except that the pH=10 of the solution in step (2) is changed to pH=10.5, and the modification of the low surface free energy in step (4) The time of the modification was changed to 4 hours, and the temperature was room temperature. After the modification, it was cleaned with absolute ethanol, and after drying with a hair dryer, a super-hydrophobic film layer was obtained on the surface of the magnesium alloy.

Embodiment 3

[0034] Embodiment three prepares the method for superhydrophobic film layer on the surface of magnesium alloy and embodiment one is basically the same, and difference is: the pH=10 of step (2) solution changes pH=11, and the constant temperature water bath in step (3) The temperature was set at 70°C, the time for low surface free energy modification in step (4) was changed to 3 hours, and the temperature was room temperature. After the modification was completed, it was cleaned with absolute ethanol and dried with a hair dryer to obtain a superhydrophobic film on the surface of the magnesium alloy.

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Abstract

The invention provides a preparation method of a superhydrophobic film on a magnesium alloy surface, which mainly comprises the following steps: preparing a mixed solution (pH value is 10-11) containing 0.1M (molar concentration) Zn(CH3COO)2.2H2O and 0.05M Al(OH)3, transferring the solution into a stainless steel hydrothermal synthesis reaction kettle, vertically inserting a pretreated magnesium alloy sample into the mixed solution, and reacting in the 60-DEG C thermostat water bath for 5 hours to obtain a micro/nano multilevel-structure rough surface on the magnesium alloy surface; and immersing the rough surface in a 0.05M stearic acid ethanol solution for 5 hours to prepare the superhydrophobic film on the magnesium alloy surface. The electrochemical testing on the corrosion resistance of the magnesium alloy before and after superhydrophobic treatment detects that the superhydrophobic film can obviously enhance the corrosion resistance of the magnesium alloy. Besides, the prepared hydrotalcite-like superhydrophobic film has high superhydrophobicity stability in an atmospheric environment.

Description

technical field [0001] The invention belongs to the field of metal material surface treatment technology and surface modification, in particular to a method for preparing a hydrotalcite-like superhydrophobic film layer grown in situ on the surface of a magnesium alloy. Background technique [0002] Among the metal materials used in practice, magnesium alloy is the lightest metal structure material, its specific gravity is only 1 / 4 of iron and 2 / 3 of aluminum, and it has high specific strength and specific stiffness, good electromagnetic shielding performance, Machining performance, casting performance and biodegradability, so magnesium alloy is known as "the green engineering material of the 21st century", and is widely used in automobile manufacturing, aviation, medical biomaterials and 3C industry. Especially with the increasing energy and environmental problems and the rapid development of the automobile industry, the lightweight of automobiles can significantly reduce en...

Claims

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Application Information

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IPC IPC(8): C23C26/00B05D3/00B05D1/18
Inventor 高克玮周孟庞晓露
Owner UNIV OF SCI & TECH BEIJING
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