Theoretical and experimental exploration of organic molecules adsorption on iron surfaces for corrosion inhibition: a review
Khdir Ahmed Othman, Wali M. Hamad, Rebaz Anwar Omer
Abstract
Abstract Iron corrosion in acidic environments poses a significant challenge in various industries. This study explores the relationship between theoretical parameters and experimental data for organic corrosion inhibitors applied to iron surfaces in 1 M HCl solution at 25 °C. The review analyzes studies employing various techniques, primarily Electrochemical Impedance Spectroscopy (EIS), to assess inhibitor efficiency (IE%). Key theoretical parameters like E binding (interaction strength) and Δ N (electron transfer) are investigated for their ability to predict IE%. The findings reveal a strong correlation between experimental IE% and E binding , suggesting the potential of E binding as a reliable predictor of inhibitor performance before experimentation. While Δ N demonstrates promise in evaluating inhibitor effectiveness, further validation is necessary. Furthermore, the review emphasizes the possibility of using a single standardized method like EIS for inhibitor efficiency evaluation due to consistent results observed across studies with standardized conditions. Additionally, the influence of factors like molecular structure, surface interactions, and temperature on inhibitor effectiveness is highlighted. Higher inhibitor concentrations and lower temperatures generally resulted in improved corrosion inhibition. This review underscores the importance of a combined theoretical and experimental approach for the development of efficient and optimized corrosion inhibitors for iron in acidic environments.