Method for preparing super-hydrophobic green film on magnesium alloy substrate
A superhydrophobic, magnesium alloy technology, applied in the direction of surface coating liquid device, pretreatment surface, coating, etc., to achieve the effect of simple equipment, easy large-scale preparation, and low cost
Inactive Publication Date: 2012-08-01
DALIAN UNIV OF TECH
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[0003] In order to overcome the difficulties and problems existing in the preparation of superhydrophobic magnesium alloy surface in the prior art, the present invention proposes a simple, efficient and low-cost immersion method to prepare superhydrophobic green film on the magnesium alloy substrate
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Embodiment 1
[0018] The 20×30×2mm AZ61 magnesium alloy plate was polished with 1500# sandpaper to remove the oxide layer and impurities on the surface. The polished magnesium alloy plate was ultrasonically cleaned by absolute ethanol and deionized water in sequence, and dried. Then soak the cleaned magnesium alloy plate in 80±5℃, 0.2mol / L copper sulfate aqueous solution for 10min, take it out, rinse thoroughly with deionized water, and blow dry. Finally, soak the dried magnesium alloy plate in 0.05 mol / L stearic acid ethanol solution for 3 hours, take it out and put it in an oven at 120° C. for 10 minutes. The surface of the dried magnesium alloy plate is covered with a green rough film, which is superhydrophobic. The contact angle of water droplets on it is 151.3°, and the rolling angle is only 3°.
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The invention discloses a method for preparing a super-hydrophobic green film on a magnesium alloy substrate. The method comprises the following steps of: polishing and grinding a magnesium alloy plate, cleaning for oil removal, soaking in an aqueous solution of copper sulfate for not less than 10 minutes, putting the soaked magnesium alloy plate into an ethanol solution of stearic acid for not less than 3 hours, taking out, and drying to obtain a layer of super-hydrophobic green film. The super-hydrophobic film prepared by the method has high hydrophobicity, the contact angle of a water drop on the film is more than 150 degrees, and the rolling angle is only 3 degrees; and the method has the advantages of high efficiency, low cost and the like and is simple.
Description
technical field [0001] The invention relates to a method for constructing a new structure and modification on the surface of a metal substrate, in particular to a method for preparing a super-hydrophobic green film on a magnesium alloy substrate. Background technique [0002] As the lightest metal structural material among practical metals, magnesium alloy has a series of advantages such as low density, high specific strength, strong impact resistance and good battery shielding performance. Wide application prospects. However, due to the active chemical properties of magnesium, the corrosion resistance of magnesium alloys is very poor, which limits the application of magnesium alloys. The existing methods for improving the corrosion resistance of magnesium alloys mainly include chemical conversion coating, organic coating, electroless nickel coating, micro-arc oxidation and laser treatment. However, the above methods have disadvantages such as serious environmental polluti...
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Inventor 徐文骥宋金龙刘新陆遥王续跃
Owner DALIAN UNIV OF TECH