Enhancing epoxy coating corrosion resistance with a novel MoS2-modified polydopamine functionalized graphene oxide nanocomposite

Environmental-friendly epoxy (EP) composite coatings are regarded as distinguished candidates for preventing metal corrosion. In this paper, we synthesized a novel GO-PDA-MoS 2 /EP nanocomposite coating system by modifying dopamine (PDA) functionalized graphene oxide (GO) with MoS 2 . Here, the effect of different MoS 2 additions on the corrosion resistant properties of coatings was investigated by altering the ratio of MoS 2 to GO-PDA via electrochemical measurements, long-duration immersion experiments, and water contact angle tests. The results indicated that 0.3  wt .% MoS 2 can substantially enhance the interfacial compatibility between EP and GO-PDA and the GO-PDA-MoS 2 -0.3  wt .%/EP coating presented optimum corrosion resistant properties. Specifically, the impedance modulus (|Z|) of the GO-PDA-MoS 2 -0.3  wt .%/EP coating still reached 2.36 × 10 7 Ω·cm 2 after 30 days immersed, which was two orders of magnitude higher than pure EP coatings. This work demonstrates a novel economical and environmental scheme that MoS 2 can be employed to enhance the corrosion resistant properties and improve the interfacial interactions of EP coatings.