Corrosion Inhibition of Carbon Steel in Hydrochloric Acid Solution Using Ethoxylated Nonionic Surfactants Based on Schiff Base: Electrochemical and Computational Investigations

Abstract

Two ethoxylated nonionic surfactants (L400 and L600) based on Schiff base are prepared from polyoxyethylene, glyoxalic acid, and phenylenediamine. They are evaluated electrochemically as carbon steel corrosion inhibitors in 1 M HCl by electrochemical impedance spectroscopy (EIS) and Tafel techniques and complemented with microscopic analysis methods. The obtained Tafel data indicate the mixed-type behavior of the inhibitor used. The inhibition efficiency touches the peak at 1 × 10 –4 M, exhibiting 92 and 94% for L400 and L600, respectively. The presence of the tested inhibitors decreases corrosion current density ( i corr ) and double-layer capacitance ( C dl ) due to the formation of a protective adsorption layer in place of the already adsorbed water and aggressive Cl – ions. Both L400 and L600 adsorption modes follow Langmuir adsorption isotherm. The density functional theory (DFT) calculated indices (Δ E gap and E HOMO ) indicate the superiority of L600 over the L400 counterpart as a reactive compound. Adsorption of L600 and L400 over the Fe(1 1 0) in simulated acidic medium is investigated by Monte Carlo (MC) simulation to verify their inhibition performance and are matched with adsorption free energy Δ G ads calculated values. Both experimental and theoretical data are in agreement.

Green inhibitor of carbon steel corrosion in 1 M hydrochloric acid:Eruca sativaseed extract (experimental and theoretical studies)

“…Nonetheless, because of the very destructive corrosion impact of the mineral acid utilized, this process must be controlled. [14][15][16][17][18] Organic inhibitors, such as those containing nitrogen, oxygen, sulfur, or carbon, are one of the most widely used strategies for combating metal corrosion, which causes signicant economic losses and serious accidents in the industry. [19][20][21][22][23][24][25][26] Hetero-atoms, conjugate p bonds, and aromatic nuclei, set in organic compounds have been shown to be particularly effective at preventing corrosion in previous studies.…”

Coco Monoethanolamide Surfactant as a Sustainable Corrosion Inhibitor for Mild Steel: Theoretical and Experimental Investigations

“…In addition to being ecologically friendly and sustainable, non-ionic surfactants also have the potential to reduce corrosion. They have centres with a high electron density (N, S, O, P, π electrons and aromatic ring), enabling them to adsorb on metallic surfaces and protecting them from corrosive environments [ 37 , 38 , 39 , 40 ]. Some green corrosion inhibitors, according to reports, are, however, costly or only work well when administered in high concentrations.…”

The oligosuccinimide and modified polysuccinimide as green corrosion and scale inhibitors

“…Several techniques have been applied to control corrosion and scale formation. Corrosion reaction on metal can be controlled by using corrosion-resistance material [10,11], coating/painting [12][13][14], and corrosion inhibitors [15][16][17]. Meanwhile, scaling can be solved physically, by the ultrasonic wave and magnetic field, or chemically, by pickling, acidification, and scale inhibitors [18][19][20].…”