6-dibutylamino-1,3,5-triazine-2,4-dithiolmonosodium as an inhibitor of brass corrosion in 0.5 M sodium chloride solution

Abstract

The inhibition action of 6-dibutylamino-1,3,5-triazine-2,4-dithiolmonosodium (DBN) on the corrosion of brass in a 0.5 M sodium chloride solution has been investigated using weight loss methods, potentiodynamic polarization curves, contact angle measurements and scanning electron microscopy (SEM) techniques. Results indicated that the inhibition efficiency increases with increasing concentration of DBN. The potentiodynamic polarization results showed that the corrosion inhibition efficiency reaches 98% when the concentration of DBN is 1.2 mM. Adsorption of DBN inhibitors on the brass/chloride surface is found to follow the Langmuir’s adsorption isotherm. The calculated ΔGads value of −17.56kJ/mol demonstrates that the adsorption of DBN on brass surface is a spontaneous and exothermic process at 30 °C. Further, morphology observation results reveal that the DBN acts as a good inhibitor for brass in chloride solution.