Inhibitor effect of nicotinamide on corrosion of aluminum

Abstract

The inhibitory effect of nicotinamide on the corrosion of aluminum in 0.1 M NaCl and 0.1 M NaOH aqueous solutions was investigated in this study for the first time. In this study, the inhibitory effect of nicotinamide on corrosion of aluminum in 0.1 M NaCl and 0.1 M NaOH aqueous solutions was investigated. Since nicotinamide has nitrogen and oxygen atoms with unpaired electrons in its structure, it has been chosen with the idea that it may be a good inhibitor candidate. Nicotinamide is also an environmentally friendly compound without toxic effects. For the best inhibitor activity of nicotinamide, time and inhibitor concentration parameters were investigated. The best inhibitory activity time and inhibitor concentration was determined as 60 min and 500 ppm respectively. Tafel Polarization method was used for corrosion rate measurements. Cyclic Voltammogram were taken to determine the electrochemical behavior of aluminum in saline and basic environments that do not contain inhibitors and contain inhibitors of different concentrations. For both media, it was found that as inhibitor concentration increased, corrosion potential shifted to positive values and corrosion current decreased. This shows that nicotinamide, as an anodic inhibitor, reduces the anodic reaction by forming a film on the aluminum surface. (C) 2019 Elsevier B.V. All rights reserved.