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| PREPARATION OF GREENISH SUPER-HYDROPHOBIC DUPLEX-MODIFIED FILM ON Mg-Li ALLOY AND ITS CORROSION RESISTANCE |
| HOU Wenting, KANG Zhixin |
| National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640 |
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Abstract Greenish analogous ceramic coating was obtained on the surface of Mg-Li alloy by micro-arc oxidation (MAO) coloring, then duplex modification was executed through polymer plating on the surface of MAO coloring film. The contact angle of distilled water, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the wettability and corrosion resistance before and after duplex modification, respectively. The experimental results showed that the MAO coloring surface is covered by polymeric thin film through polymer plating, and it leads to the change of contact angle from nearly 0° to 169.2°, which indicates the wettability is modified from super-hydrophilic to super-hydrophobic. The MAO coloring film exhibits better corrosion resistance than bare Mg-Li alloy and its corrosion resistance is improved by duplex modification of polymer plating. Compared to bare Mg-Li alloy, the corrosion current density of super-hydrophobic duplex-modified film from potentiodynamic polarization decreases by three orders of magnitude and electrochemical impedance from electrochemical impedance spectroscopy increases by three orders of magnitude in 0.1 mol/L NaCl solution.
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Received: 30 May 2011
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| Fund: Guangzhou Science and Technology Development Program of China |
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Corresponding Authors:
KANG Zhixin
E-mail: zxkang@scut.edu.cn
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