Predicting ionic liquid efficiency as steel corrosion inhibitor under static hydrochloric acid immersion using group contribution method

Abstract

As a novel corrosion inhibitor, ionic liquid has garnered a growing amount of interest. Different electrodes, such as carbon steel, stainless steel, aluminium, copper, magnesium, and others; different electrolytes, such as hydrochloric acid, sulfuric acid, nitric acid, and seawater; different condition operations at different temperatures and tribological properties; and various techniques, such as weight loss (WL), potentiodynamic polarization (PDP), and electro impedance spectroscopy (EIS), have been investigated. Due to the large number of cations and anions, this conventional laboratory study may not be completed anytime soon. Therefore, IL as a corrosion inhibitor must be investigated further. The purpose of this study is to conduct a more comprehensive analysis of IL as a corrosion inhibitor in 1 M HCl immersion on carbon steel using the group contribution method. Cations and anions were divided into 29 functional groups (FG) of cations and 17 functional groups (FG) of anions using 74 IL and 760 WL data points collected from various studies. Training and test set results have R2 values of 0.639 and AARD values of 14.9%; validation set results have R2 values of 0.319 and AARD values of 14.4%; and the overall data point evaluation has R2 values of 0.324 and AARD values of 14.3%.