Corrosion resistance of three-layer superhydrophobic composite coating on carbon steel in seawater

The corrosion resistance of the three-layer superhydrophobic composite coating on carbon steel in sterilized seawater is investigated using electrochemical and contact angle measurements. The composite coating consists of Ni–P, TiO2/ZnO and octadecyltrimethoxysilane (ODS) molecules. The corrosion resistance of the composite coating is estimated by electrochemical impedance spectroscopy (EIS) and polarization curves. The results show that forming a bi-layer or three-layer composite coating on carbon steel considerably improves the corrosion resistant in sterilized seawater. The corrosion mechanism of the composite coating on carbon steel is proposed through the equivalent circuit.