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Highlights • Extract's main basic constituent responsible for inhibition is Glu, Pro and Leu. • MGME and its main basic constituent are mixed-type inhibitors. • The antagonistic effect between Glu, Pro and Leu in extract was investigated. • Bonding of main basic inhibitors with steel was studied by theoretical calculation. Abstract The inhibition mechanism of maize gluten meal extract (MGME) for steel was systematically elucidated combining experimental analysis with theoretical calculation. It is revealed that the MGME and its main basic constituent are responsible for inhibition including Glu, Pro and Leu, their inhibition efficiency are 83.15% and 79.27%, respectively. The antagonistic effect between the main basic molecules of Glu, Pro and Leu in MGME and the barrier film formed on steel surface were verified by electrochemical measurement and XPS result, respectively. Besides the quantum chemical calculation and Monte Carlo simulation were used to clarify inhibition mechanism of co-adsorption. [ABSTRACT FROM AUTHOR]

• A novel and sustainable inhibitor was extracted from maize gluten meal. • The extracts possess amide structure and exhibit a mix-type inhibitor. • Surface analysis provides the evidence for extract adsorbed layer on steel. • Green extract is an effectively inhibitor for reinforced steel in concrete. The corrosion inhibitive effect of maize gluten meal extracts for steel in simulated concrete pore solution with 3.0 wt% sodium chloride was investigated. The results acquired from EIS and polarization studies were in a good agreement, which suggest an increase in the corrosion resistance of steel with the extract introduced comparatively to the blank systems. Adsorption of extracts onto the steel surface obeyed the isothermal Langmuir adsorption, was mainly controlled by physisorption. The confirmatory evidence of enhanced corrosion resistance during adsorption was obtained from the SEM-EDS, ATR-FTIR and surface structure analysis. Furthermore, the amide bond structures of the main constituents in extract were also beneficial to adhere to steel surface. The sustainable extract of maize gluten meal is a by product of starch industry, which is an effectively and promisingly inhibitor for reinforced steel with the anticorrosion efficiency of 62.71–88.10%. [ABSTRACT FROM AUTHOR]