Highly protective polyolefin coating modified with ceria nano particles treated with N,N,N',N'-Tetrakis(2-hydroxyethyl)ethylenediamine for corrosion protection of carbon steel

A polyolefin coating was modified with cerium oxide nanoparticles treated with N,N,N',N'-Tetrakis(2-hydroxyethyl)ethylenediamine (THEEDA) as corrosion inhibitor for corrosion protection of carbon steel. Electrochemical Impedance Spectroscopy tests carried out in 0.05 M NaCl revealed low-frequency impedance modulus around 1012 ٠cm2 for the modified coating without significant changes after three months of immersion. The self-healing ability of modified coating was studied by combining different localized electrochemical techniques, namely localized impedance spectroscopy (LEIS), the scanning vibrating electrode technique (SVET), and scanning fiber-optic dissolved oxygen microsensor. This comprehensive study confirmed the ability of ceria nanoparticles treated with THEEDA to mitigate corrosion thanks to the synergistic protective role of ceria nanoparticles and THEEDA that inhibit both cathodic and anodic activities, respectively.This publication was made possible by NPRP11S-1226-170132 from Qatar National Research Fund (a. member of the Qatar Foundation). Authors from Centro de Qu�mica Estrutural and CERENA acknowledge the financial support of Funda��o para a Ci�ncia e Tecnologia, through grants UIDB/00100/2020, UIDP/00100/2020; The authors acknowledge Dow Chemical Company (Dr. Bernhard Kainz, Global Application Development Leader Metal Packaging Coatings, Dow Coating Materials) for providing polyolefin-based coating formulation CANVERATM 1110 and VoestAlpine AG for providing the steel samples. M.A. also thanks M.Sc. M�rio Vale and M.Sc. M�nica Loureiro for support on the synthesis set-up and micro-FTIR experiments, M.Sc. Mafalda Macatr�o for helping in the SEM characterization, and Dr. Ana Cristino (Faculdade de Ci�ncias da Universidade de Lisboa) for conducting the XRD tests.Scopu