Functionalized chitosan-based coatings for active corrosion protection

J. Carneiro , J. Tedim , Susana C.M. Fernandes (1) , C.S.R. Freire , A. Gandini , M.G.S. Ferreira , M.L. Zheludkevich

1 Universidade de Aveiro

Chitosan-based coatings were suggested in this work as a "green" alternative for active corrosion protection of aluminum alloys. 2-Mercaptobenzothiazole (MBT) was used here as an efficient corrosion inhibitor for AA2024. The electrochemical impedance spectroscopy has demonstrated a strong inhibiting action of MBT showing no corrosion attack even after one week in full immersion tests when MBT-loaded chitosan coatings are applied.The surface properties of the chitosan coatings were improved by chemical grafting with poly(ethylene-alt-maleic anhydride) (PEMA) and poly(maleic anhydride-alt-1-octadecene) (POMA), aiming at increasing hydrophobicity that is crucial for corrosion protection in atmospheric conditions. The high contact angles, in the range of 140°, were obtained on the MBT-containing chitosan films. © 2013 Elsevier B.V.

Domaines: Polymères

J. Carneiro, J. Tedim, Susana C.M. Fernandes, C.S.R. Freire, A. Gandini, et al.. Functionalized chitosan-based coatings for active corrosion protection. Surface and Coatings Technology, 2013, 226, pp.51-59. ⟨10.1016/j.surfcoat.2013.03.035⟩. ⟨hal-01600468⟩