A dissymmetric bis-quaternary ammonium salt gemini surfactant as effective inhibitor for Q235 steel in hydrochloric acid

► The dissymmetric bisquaternary ammonium gemini surfactant as HCl corrosion inhibitors. ► The studied bis-quaternary ammonium salt is a mixed-type inhibitor. ► The inhibition efficiency increases with temperature. ► Adsorption of the inhibitor follow Langmuir isotherm and is chemical adsorption.