Synthesis and characterization of a unique isocyanate silane reduced graphene oxide nanosheets; Screening the role of multifunctional nanosheets on the adhesion and corrosion protection performance of an amido-amine cured epoxy composite

The present study focuses on improving the adhesion bonding strength between an amido-amine cured epoxy coating and steel substrate and decreasing the cathodic delamination rate via a new surface pretreatment method through decoration of steel/epoxy interface by graphene oxide (fGO) nanosheets co-valently functionalized with 3-(Triethoxysilyl) propylisocyanate. The effect of fGO film on the organic coating behavior was determined by electrochemical impedance spectroscopy, Pull-off adhesion, water contact angle, cathodic delamination and salt spray tests. It was found that steel surface pre-treatment by fGO coatings could remarkably improve the adhesion strength and corrosion prortection properties and reduce cathodic delamination rate. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.