Abstract
A hierarchical superhydrophobic film has been fabricated on a magnesium alloy substrate via a facile chemical substitution method following stearic acid modification. The characteristics of the film were investigated by scanning electronic microscope (SEM), energy dispersive spectroscopy (EDS), Fourier transformed infrared (FT-IR) spectroscopy and X-ray diffraction (XRD). The results showed that the hierarchical film surface with cluster structures composed of micro-sheets and stearic acid had been successfully grafted onto the sample surface. The film wettability was examined by water contact angle (CA) measurement and the obtained CA value was as high as 167.4°. The corrosion resistance of the superhydrophobic film to the substrate was tested with potentiodynamic polarization measurement. Polarizaton measurements revealed that the superhydrophobic film coated magnesium alloy had better corrosion resistance in neutral 3.5 wt. % NaCl solution. Morever, the superhydrophobic film showed good self-cleaning property and chemical stability.
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