Resumo

ARSHAD, Nasima; IMRAN, Muhammad; AKRAM, Muhammad  e  ALTAF, Fouzia. Graphene Oxide-Aryl Substituted Triazole Thin Hybrid Corrosion Resistant Coating for Copper. Port. Electrochim. Acta [online]. 2022, vol.40, n.3, pp.193-207.  Epub 30-Jun-2022. ISSN 0872-1904.  https://doi.org/10.4152/pea.2022400304.

A graphene oxide-triazole hybrid anti-corrosive coating was done by fabricating a triazole derivative - 2-(5-mercapto-4-((3-nitrophenyl)amino)-4H-1,2,4-triazol-3-yl)isoindoline-1,3-dione (4-NBT) on a graphene oxide (GO) coated Cu electrode. The GO-4-NBT hybrid coating effect on the Cu surface corrosion behavior was electrochemically monitored through cyclic voltammetry (CV), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The fabrication of a protective coating was done in two steps. Firstly, GO was electrochemically deposited on the Cu electrode in two different aggressive media (1 M HCl and 0.1 M Na2SO4), separately. Secondly, different 4-NBT concentrations were employed to reinforce GO corrosion resistant properties. CV studies revealed that GO-4-NBT effectively suppressed the metal oxidation and oxygen reduction. EIS studies suggested that the electrochemical process on the Cu surface with GO and GO-4-NBT was charge transfer controlled. The corrosion inhibition efficiency (IE) measured by PDP and EIS was enhanced with a related raise in 4-NBT concentration. Electrochemical studies revealed that the GO-4-NBT was a mixed type of inhibitor that predominantly inhibited the anodic reaction, especially in the case of 0.1 M Na2SO4. Adsorption studies further indicated the involvement of a stable and spontaneous adsorption mechanism, most probably by chemisorption. GO-4-NBT has shown significant corrosion protection activity in 0.1 M Na2SO4.

Palavras-chave : GO-4-NBT; Cu electrode; anti-corrosion coating; electrochemical studies by; PDP and EIS; adsorption studies.

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