Investigation the Results of Density Function Theory and Potentiodynamic Polarization Test of Corrosion Inhibitors in Hydrochloric Acid Environment

The purpose of this research was investigation the effectiveness of two organic inhibitors containing thiazole functional group for preventing corrosion based on the results of density function theory extracted from Gaussian 09W software and then comparing and verifying these results with the potentiodynamic polarization test results. The results showed that two corrosion inhibitors, Mercapto Benzo Thiazole and Aneurin, were film-forming and mixed type inhibitors and have the ability to prevent the corrosion of carbon steel in hydrochloric acid environment. The analysis of the results showed that the data obtained from the laboratory tests and the parameters extracted from the software were verified each other. Among these two inhibitors, MBT showed a higher inhibition percentage due to the presence of more and stronger heteroatoms and a higher tendency to donate electrons, so that the inhibition efficiency of 200 ppm of this inhibitor at 25 °C was reported 87%.