In-situ grown super- or hydrophobic Mg-Al layered double hydroxides films on the anodized magnesium alloy to improve corrosion properties

摘要

Mg-Al layered double hydroxides (LDHs) were deposited on the anodized magnesium alloy AZ31 via an easy in-situ method, and the surfaces of MgAl-LDHs were modified with myristic acid (MA) and 1H, 1H, 2H, 2H-Perfluorodecyltrimethoxysilane (PFDTMS). The obtained results showed that LDHs with the biggest flakes were preferential sites for absorption of MA, while unfavorable for the adsorption of PFDTMS. All of films modified with MA were superhydrophobic. The corrosion behavior of the AZ31 with modified LDH films was evaluated using hydrogen collection, electrochemical impedance spectroscopy (EIS), polarization potentiodynamic curves and the immersion tests. The superhydrophobic films considerably improved the corrosion performance of the LDH films on the AZ31 substrate.