How the Semiconductor Transition Metal Dichalcogenides Replaced Graphene for Enhancing Anticorrosion
Semiconductor transition metal dichalcogenides (TMDs) are expected to be used for corrosion protection, while few studies have focused on the interactions between TMDs and metal substrates. Herein, few layered TMDs nanosheets MoS2 and WS2 were obtained through a liquid exfoliation technique. And then, the TMDs reinforced epoxy (TMDs/EP) composite coatings were fabricated through incorporating MoS2 and WS2 nanosheets into epoxy matrix. The corrosion behavior of the TMDs/EP composite coatings was investigated by a series of electrochemical tests like EIS and Polarization curves. And the corrosion promoting activity of the MoS2 and WS2 were also studied through the EIS measures of the semiconductor/metal contacts at coating defects. Our work reveals that single layered TMDs and GNPs accelerated the corrosion of metals, while few layered TMDs nanosheets exhibited no promising effect. At the same time, we proposed the different corrosion mechanisms according to the work function difference of nanomaterials as well as their oxygen reduction reaction activity to clarify the corrosion promoting activity.