Comparative study of the performance and inhibitory efficiency of two new organic heterocyclic in the chemical industry

Abstract

In this study, two inhibitors namely 6-Chloro −2-phenylimidazo[1,2-a]pyridine (Pyr1) and 6-Chloro-2-(4- Chlorophenyl)imidazo[1,2-a]pyridine (Pyr2) were used to investigate their inhibition ability toward mild steel corrosion in 1 M HCl using electrochemical techniques and quantum approaches. The two inhibitors show corrosion inhibition efficiency of 98.35% and 97.57% for Pyr2 and Pyr1 respectively at the optimum concentration 10-3 M. This is due to the features of the substituent group and the effect of its emplacement in the phenyl ring. The electrochemical measurements reveal that both anodic and cathodic current are affected by these organic compounds so they are classified as mixed-type inhibitors with predominance cathodic character. The inhibited solution was analysed using UV spectrometer, which indicates a tendency to develop a complex between inhibitors and ferrous ions. The computational approaches were performed in order to examine the correlation between inhibition efficiency and molecular structure of the inhibitors Pyr1 and Pyr2.