Corrosion Protection Performance of YSZ Coating on AA7075 Aluminum Alloy Prepared by Aerosol Deposition

Yttria stabilized zirconia (YSZ) coating was deposited on AA7075 aluminum alloy by aerosol deposition (AD) at room temperature, and its electrochemical corrosion properties were investigated in 0.5 M H2SO4, 3.5 wt% NaCl, and 0.1 M KOH solutions. A crack-free, dense, and ∼5 μm thick YSZ coating on Al alloy was successfully obtained by AD method. The YSZ coating was polycrystalline and composed of ∼10 nm nanocrystallites. Potentiodynamic and electrochemical impedance spectroscopy (EIS) tests indicated that the corrosion behavior in each solution was different, but the corrosion protection of the AA7075 Al alloy was significantly improved by the AD YSZ coating in all three solutions.