Adsorption and corrosion inhibition performance of multi-phytoconstituents from Dioscorea septemloba on carbon steel in acidic media: characterization, experimental and theoretical studies

•Extracts of Dioscorea septemloba were characterized.•The extracts acted as mixed-type corrosion inhibitors•Surface analysis confirmed the presence of the extracts on the metal surface.•The adsorption properties were discussed by computational studies.