Influence of (3-mercaptopropyl) methyldimethoxysilane on a GO/Zn coating and its corrosion resistance

A GO/MPTS coating on a Zn coating electrodeposited on carbon steel was prepared by immersing zinc samples into suspension of graphene oxide/(3-mercaptopropyl) methyldimethoxysilane GM and then drying at 80°C. The silanol groups reacted with oxygen-containing functional groups on the GO during the hydrolysis process, and the GO was stacked layer by layer to construct a dense organic coating over the etched zinc surface. The synthesized GM coatings were characterized by FTIR, XRD, Raman spectroscopy and SEM. The corrosion behaviour of the galvanized carbon steel (GCS) and GCS coated with a GM composite coating exposed to a 3.5% NaCl solution were studied by potentiodynamic polarization and EIS. The results confirm that the GM coating can effectively protect GCS. Combined with the physical characterization of the GM-coated GSC explaines its markedly increased corrosion resistance.