Benzodimidazole and Imidazole as Corrosion Inhibitors of AISI 316L Stainless Steel in Sulphuric Acid Medium

Tuesday, 7 October 2014
Expo Center, 1st Floor, Center and Right Foyers (Moon Palace Resort)
C. Cardona (Facultad del Hábitat, Universidad Autónoma de San Luis Potosí, Universidad Tecnológica de Querétaro (UTEQ)), L. Narváez (Facultad del Habitat, Universidad Autónoma de San Luis Potosí), J. M. Miranda (Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí), and A. Acosta (Instituto Mexicano del Transporte)
The corrosion behaviour of AISI 316L stainless steel in 0.5 M H2SO4 solution containing various concentrations of dimethyl benzodimidazole (BZD) as corrosion inhibitor was investigated. Inhibition efficiency was evaluated using potentiodynamic polarization and electrochemical impedance techniques. 40 ppm of BZD showed the best behaviour at 25 °C, above this concentration the efficiency was decrease. All results were compared with imidazole as inhibitor as same conditions, founded a similar performance at 40 ppm. Both inhibitors showed absorptions on the stainless steel surface which obeyed the Frumklin isotherm adsorption equation.