Inhibition of API 5L X52 Pipeline Steel Corrosion in Acidic Medium by Gemini Surfactants: Electrochemical Evaluation and Computational Study

Abstract

The efficiency of three new synthesized Gemini surfactants (namely, A312, A314, and A316) of the type 4,4-[1,4phenylenebis(azanylylidene)bis(N,N-dimethyl-N-alkylaminium] bromide is evaluated as corrosion inhibitors for carbon steel API 5L X52 grade in 1M HCl. The relation between the experimental inhibition efficiency and theoretical chemical parameters obtained by computational calculation in order to predict the behavior of the organic compounds as corrosion inhibitors was instigated. The chemical structures were elucidated using 1HNMR spectra. Inhibition performance was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and weight loss tests. The polarization curves show that applied surfactants act as mixed type inhibitors. Nyquist plots showed the semicircle capacitive loop with different surfactants and concentrations. The inhibition efficiency orders are A312 > A314 > A316 with the highest efficiency of 94.87% for A312. Adsorption of inhibitors on API X52 steel surface was found to obey Langmuir isotherm. Theoretical evaluation of the inhibitory effect was performed by computational quantum chemical calculations. The molecule structural parameters (EHOMO), (ELUMO), energy gap (ΔE), and the dipole moment (μ) were determined. The results of experimental inhibition efficiency and theoretical calculated quantum parameters were subjected to correlation analysis.

Synthesis New Triethylammonium Salts as Corrosion Inhibitors for Mild Steel in 1 MH2SO4

“…Surfactant efficiency as corrosion inhibitors has recently been extensively researched in various media and for the protection of multiple metals, leading to studies on organicbased corrosion inhibitors [13][14][15]. Gemini surfactants, which are new generation quaternized salt surfactants composed of two surfactant monomers joined together by a spacer group, have been thoroughly investigated in corrosion investigations [16,17]. For instance, innovative cationic Gemini surfactants produced for C-steel pipeline corrosion inhibition in 1 M HCl media [18] shown a potent inhibition effectiveness.…”

An Eco-Friendly Quaternary Ammonium Salt as a Corrosion Inhibitor for Carbon Steel in 5 M HCl Solution: Theoretical and Experimental Investigation

“…Recently, the effectiveness of surfactants as corrosion inhibitors has been widely investigated in different mediums and for the protection of several metals, contributing to approximately 24% of organic-based corrosion inhibitor studies [ 22 , 23 , 24 ]. As new generation surfactants of quaternized salts, consisting of two surfactant monomers linked together through a spacer group, Gemini surfactants have been extensively examined in corrosion studies [ 25 , 26 ]. For instance, novel cationic Gemini surfactants synthesized for corrosion inhibition in the context of C-steel pipelines in 1 M HCl medium by Hegazy et al [ 27 ] exhibited a strong inhibition efficiency, reaching 93.7%.…”

Enhancement of corrosion resistance and mechanical properties of API 5L X60 steel by heat treatments in different environments

“…In addition, different pH values and concentrations of various exposed solutions affect the corrosion behavior of heat-treated samples (Sharma and Chhibber 2019). Hamed et al conducted a comparative study between theoretical chemical parameters and experimental inhibition efficiency of Gemini surfactants for carbon steel API 5L X52 grade (Hamed et al 2019).…”