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The N in the nitrogen-containing corrosion inhibitor molecules can not only adsorb with carbon steel to form a protective film， but also destroy the bacterial cell membrane and thereby killing the bacteria. In order to explore the corrosion inhibition performance of benzimidazole catering waste oil derivative corrosion inhibitor on Q235 carbon steel， benzimidazole catering waste oil derivative 2-heptadecyl-5-methyl-1H-benzo[d]imidazole corrosion inhibitor was added into simulated seawater， and the weight loss method， electrochemical test and scanning electron microscope were used to characterize the corrosion. Meanwhile， molecular dynamics simulation was employed to investigate the adsorption performance parameters of corrosion inhibitor molecules on the Fe surface. Results showed that when the added amount of benzimidazole catering waste oil derivative corrosion inhibitor was 500 mg/L， the corrosion inhibition rate could reach 91.95%. The molecular dynamics simulation results revealed that the corrosion inhibitor molecules had a planar adsorption configuration on the Fe surface.