Fig. 1. Plasma electrolytic oxidation of Mg alloy (AZ31B); (a) appearance of plasma discharge in silicate based electrolyte and SEM image of (a) top surface and (b) cross-section of porous oxide layer.
Fig. 2. Schematic mechanism of hydrophobizing techniques; (a) Teflon coating, (b) self-assembled monolayer coating of Octadecyltrichlorosilane (OTS) and (c) self-assembled monolayer coating of perfluorodecyltrichlorosilane (FDTS).
Fig. 3. Static contact angle of water droplet on (a) bare Mg alloy and (b) plasma electrolytic oxidized (PEO) surface. Static and dynamic (advancing and receding) contact angles of water droplet on (c) Teflon-coated, (d) OTS-coated and (e) FDTS-coated PEO surface.
Fig. 5. SEM image, EDS spectra and chemical composition of (a) Teflon-coated, (b) OTS-coated and (c) FDTS-coated PEO surface.
Fig. 4. (a) Potentiodynamic polarization curves of bare AZ31B Mg alloy, PEO treated surface (PEO), PEO treated surface with Teflon coating (PEO-T), PEO treated surface with OTS coating (PEO-O) and PEO treated surface with FDTS coating (PEO-F) in 3.5 wt.% NaCl solution. (b) Estimated corrosion current density and potential. (c) Estimated inhibition efficiency.
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