Chemically modified resveratrol as green corrosion inhibitor for Q235 steel: Electrochemical, SEM, UV and DFT studies

It is of great significance to develop high-efficiency and green corrosion inhibitors for Q235 steel under acidic conditions. In this study, resveratrol was chemically modified to resveratro-3-O-beta-D-glucopyranoside (R3GP) in order to increase its solubility and complexation ability with metal ions. The obtained electrochemical analysis results indicated that R3GP was an anode-based mixed inhibitor, whose inhibitive efficiency was obviously higher than that of resveratrol (400 mg/L, 90.33% versus 69.52%). The adsorption of R3GP over steel surface followed Langmuir isotherm, and the inhibition efficiency was still maintained 82.60% at 328 K. Surface analyses (SEM and AFM) proved the existence of R3GP on Q235 steel surface to form a corrosion-protective film. Quantum chemistry calculations revealed the R3GP molecule could be more stable on Q235 steel surface. Molecular dynamic simulations also manifested that R3GP was absorbed more strongly on the metal surface in a parallel mode and had a large bind energy (561.66 kJ/mol). (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The development of high-efficiency and green corrosion inhibitors for Q235 steel under acidic conditions is of great significance. Resveratrol was chemically modified to resveratro-3-O-beta-D-glucopyranoside (R3GP) to enhance its solubility and complexation ability with metal ions. The study found that R3GP showed superior inhibitive efficiency compared to traditional resveratrol, forming a corrosion-protective film on the steel surface and exhibiting stable adsorption capacity.