Evaluation of Leaf and Bark Extracts of Chrozophora Plicata as Corrosion Inhibitors for Mild Steel in HCl

Metals and alloys are susceptible to corrosion, a severe occurrence that shortens the lifespan of metallic and alloyed items and lowers their value and efficiency. Developing affordable and environmentally friendly inhibitors from the many local plants found in Kanuvai, Tamilnadu, India, was the goal of this study. For the ethanolic extracts from leaves and barks, phytochemical screening was done. Flavonoids, phenolic chemicals, and polyphenols were identified as the main groupings. The effectiveness of the inhibitors was examined using electrochemical impedance spectroscopy as well as potentio-dynamic polarization curves. For CTL and CTB, the highest possible IE%s were 87.1% and 69.6%, respectively. Both extracts function as mixed type inhibitors, according to the results of the potentio-dynamic polarization (PDP) tests. An increase in polarization resistance is shown by the findings of electrochemical impedance spectroscopy (EIS) experiments, indicating the inhibitors' ability to inhibit. Competitive physio-sorption and chemisorption mechanisms are involved in the inhibitors' adsorption on the steel surface, which follows the Langmuir adsorption isotherm model. The influence of temperature on corrosion inhibition was examined using the EIS approach at temperatures between 298K and 328K. The findings verify that when temperature rises, the inhibition efficiency (IE%) of all inhibitors somewhat decreases. Both inhibitors' thermodynamic properties were computed.