Acenaphtho [1,2-b] quinoxaline as a novel corrosion inhibitor for mild steel in 0.5 M H2SO4

Acenaphtho [1,2-b] quinoxaline (AQ) was tested as a novel corrosion inhibitor for mild steel in 0.5 M H2SO4 solution using chemical technique at 30 °C. AQ acts as an effective inhibitor for mild steel in acidic medium. Inhibition efficiency increased with increasing concentration of AQ. Langmuir isotherm was found to provide an accurate description of the adsorption behaviour of the investigated compound. A zero-order kinetics relationship with respect to mild steel was obtained with and without AQ from the kinetic treatment of the data. DFT study gave further insight into the mechanism of inhibition action of AQ.