Trilaminar structure hydrophobic graphene oxide decorated organosilane composite coatings for corrosion protection

The hydrophobic organosilane coatings decorated with graphene oxide were prepared to hinder the water molecules and corrosive ions to the metal bases, and to retard the corrosion reactions. The trilaminar structure was composed of Fe-W amorphous alloy layer, silane cross-linked graphene oxide layer and hydrophobic organosilane layer, which were formed layer by layer via electroplating, electrophoresis and vapor deposition, respectively. The morphology of the composite coating was observed by scanning electron microscopy, the electrochemical behavior was analyzed with the electrochemical impedance spectroscopy and potentiodynamic polarization curves in 3.5 wt% NaCl solution. The results showed that the trilaminar structure composite coatings were successfully prepared, and they have excellent corrosion resistance property by a reduction of three orders of magnitude. The formation of Si-O-C covalent bonds based on X-ray photoelectron spectrometer analysis implied the improved binding force between silane and the graphene oxide sheets. The composite coatings also showed a well hydrophobic performance that the static water contact angle was achieved 141.7 degrees by controlling the morphology of the electrodeposited Fe-W alloy layer.