Exploration of Sunflower Oil As a Renewable Biomass Source to Develop Scalable and Highly Effective Corrosion Inhibitors in a 15% HCl Medium at High Temperatures

Abstract

The feasibility study of utilizing sunflower oil as renewable biomass source to develop highly effective inhibitors for mild steel corrosion (MS) in the 15% HCl medium was done by weight loss, potentiodynamic polarization (PDP), dynamic electrochemical impedance spectroscopy (DEIS), and electrochemical impedance spectroscopy (EIS), supported with energy-dispersive X-ray (EDX), atomic force microscopy (AFM), and field-emission scanning electron microscope (FESEM) techniques. Moreover, a complementary theoretical investigation was carried out to clarify the inhibition mechanism of inhibitors by density functional theory (DFT), density functional based tight-binding (DFTB), and molecular dynamics (MD) simulation approaches. The obtained results confirm that sunflower-oil-based corrosion inhibitor (SFOCI) has a significant anticorrosion property toward the dissolution of MS in 15% HCl solution in the temperature range 20–80 °C. In addition, the results show that SFOCI could provide an inhibition efficiency of 98 and 93% at 60 and 80 °C, respectively. The inhibition mechanism of SFOCIs was mixed-type and their adsorption on the surface of MS was mainly chemisorption. The FESEM and EDX studies proved the presence of SFOCI molecules on the surface of MS. In addition, the adsorption energy of SFOCI indicated an intense interaction between the inhibitor and surface of Fe. The results of this study could open a new window for the design and development of scalable and effective eco-friendly vegetable-oil-based corrosion inhibitors for highly corrosive solutions at high temperatures.

Efficient corrosion inhibition by sugarcane purple rind extract for carbon steel in HCl solution: mechanism analyses by experimental and in silico insights

“…As evidenced by other reports, 8,26,32 the concentrated distribution of the frontier orbitals (CTM and ATC) is conductive for the rapid charge interaction of an inhibitor with the metal surface; meanwhile, the polarized distribution of the frontier orbitals (ATA and CCA) favors the parallel adsorption conguration of an inhibitor. Furthermore, the four SPRE constituents exhibit a surface electron density with a prominent positive charge; consequently, these molecules preferentially adsorb on the C-steel surface via the binding bridge with pre-adsorbed chloride ions (i.e., physisorption).…”

“…It is well-established that the corrosion of C-steel in HCl medium consists of anodic metal dissolution and cathodic hydrogen evolution. 32 SPRE adsorbs on the active sites of the C-steel surface, isolates the metal from aggressive species, and thus reduces the corrosion current density. In addition, the almost parallel cathodic curves shown in Fig.…”

“…The typical parameters including solution resistance ( R s ), R ct , double-layer capacitance ( C dl ) and n are compiled in Table 2 . Accordingly, the C dl values were deduced using the Brug formula as follows: 32 …”

“…46 Meanwhile, altering the temperature dominantly changed the anodic process rather than its cathodic counterpart, conrming that SPRE behaves as a mixed-type inhibitor with a predominant anodic effect for preventing C-steel from corrosion. 32 The effect of temperature on the corrosion inhibition capacity of SPRE is also manifested by the tted kinetic parameters tabulated in Table 3. According to Table 3, i corr-P persistently increased from 0.43 mA cm À2 at 298 K to 1.01 mA cm À2 at 328 K, which indicates that an increase in temperature exacerbated the corrosion of C-steel in the HCl solution to a certain extent.…”

Development of a Novel Thermally Stable Inhibitor Based on Furfuryl Alcohol for Mild Steel Corrosion in a 15% HCl Medium for Acidizing Application

“…It causes leaks in pipelines, tubing, tanks, and other equipment, resulting in process shutdown, environmental contamination, and drastic economic losses. 6,7 Well acidizing is the most important step in the gas and oil drilling industry, in which the rock reservoir stimulation technique is applied to enhance productivity using hydrochloric acid, formic acid, hydrofluoric acid, and acetic acid at 15% concentration. 8−11 In addition, 15% HCl solutions are commonly used for scale removal treatments at temperatures up to 60 °C for eliminating carbonated minerals and iron oxides.…”