Ti3C2Tx@polyaniline/epoxy coating based on cathodic electrophoretic deposition with effective corrosion inhibition effect for corrosion protection on P110 steel

Polyaniline-coated Ti3C2Tx particles (TPi) endowed the electrophoretic deposited epoxy coating with efficient physical shielding and corrosion inhibition capacities to improve the corrosion protection ability. Ti3C2Tx of few/single layers was prepared and TPi particles were synthesized by in-situ polymerization of polyaniline on Ti3C2Tx surface. Characterization results indicated the successful synthesis of TPi material. TPi/epoxy coating was prepared on P110 steel sheet through cathodic electrophoretic deposition method, and the protection ability was tested by electrochemical impedance spectroscopy (EIS) and saline immersion test. EIS results of the complete coating showed that impedance modulus at low frequency (0.01 Hz) of TP7 coating was 3.92 x 108 omega cm2 after soaking for 20 d, which was higher than 2.82 x 106 omega cm2 of neat epoxy coating (NEP), indicating better protection performance. The results of impedance spectrum of scratched coating showed that TP7 coating had obvious corrosion inhibition effect, which was attributed to the passivation effect of polyaniline to promote the conversion of loose corrosion products into dense layers. This research provided a new approach to apply Ti3C2Tx into the electrophoretic deposited epoxy coating with corrosion inhibition effect.