Novel Amide‐Based Cationic Surfactants as Efficient Corrosion Inhibitors for Carbon Steel in HCl and H₂SO₄ media

Abstract

A variety of surface active compounds were synthesized by the quaternization of some straight chain amide derivatives with triethylamine or pyridine. Their structure FT‐IR and 1H‐NMR spectra were recorded. In addition their physical properties and corrosion prevention efficiencies were investigated. All compounds were tested with steel coupons in acidic media by the gravimetric method. As acidic media 1.5 M HCl and 1.5 M H2SO4 were used and the corrosion inhibition tests fulfilled at room temperature for 24 h. Almost all prepared cationic surfactants showed efficient inhibition around their critical micelle concentrations. The effects of HCl concentration on corrosion inhibition of some synthesized compounds were also investigated. The corrosion tests were supported by contact angle measurements.

Mono‐, Di‐ and Tetra‐Cationic Surfactants as Carbon Steel Corrosion Inhibitors

“…In oil and gas fields, solutions of acids like sulfuric, nitric, hydrochloric and phosphoric are extensively used in industrial processes like oil well acidification, acidic cleaning, and pickling, which lead to serious metal corrosion [1]. In oil and gas plants, metal equipment such as vessels, storage tanks, distillation towers, and chillers get fouled by both inorganic and organic substances from different corroding metals, lubricating oils, and deposits from hard water, so periodic cleaning is necessary to prevent damage and maintain normal operation efficiency [2]. The metal chemical cleaning process in the oil and gas industry is advantageous in comparison with mechanical cleaning methods, primarily because there is no need to dismantle or reassemble metal equipment to be cleaned [3].…”

Synthesis of Aromatic Structured Di-cationic Surfactants Used as Inhibitors Against Corrosion of Carbon Steel in Acidic Medium

“…These hydrophobic groups, oriented perpendicular to the metal surface, form nonpolar interactions originating from van der Waals attraction forces. Thus, double layered or multilayered protective layers are formed which act as a barrier between the metal surface and the acidic corrosive medium (13). It is known that non-polar interactions between the long alkyl chains in the molecule increase in parallel with the concentration of surfactant (14).…”

Synthesis of Quaternary, Long‐Chain N‐Alkyl Amides and Their Corrosion Inhibition in Acidic Media

“…On the other hand the hydrophobic tail of the surfactant molecule is oriented perpendicularly to the metal surface. Thus bilayer or multimolecular layers designated as protective layers are formed which behave as a barrier between the metal and the corrosive medium [32].…”

“…Quaternary ammonium surfactants have been reported to be excellent corrosion inhibitors for iron and steel in acidic media [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Particularly, studies have indicated that cationic surfactants containing an amide functional group are important as inhibitor additives in hydrochloric and sulfuric acids [31][32][33]. The synergistic effect between organic cations and halide anions is considered to be an important factor in the inhibition of metal corrosion [34][35][36][37].…”