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 using1HNMR 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.
Highlights
In the petroleum production industry, failures of pipelines as a result of corrosion have led to heavy loss [1]
The first goal of this study is to examine the inhibition efficiency of three synthesized cationic Gemini surfactants, namely, A312, A314, and A316, in which the two cationic head groups are linked by rigid spacer containing Schiff base, on the corrosion behavior of API X52 steel pipeline in 1 M HCl
The second goal is to identify the relation between the experimental inhibition efficiency and theoretical chemical parameters obtained by computational calculation in order to predict of the behavior of the organic compounds as corrosion inhibitors
Summary
In the petroleum production industry, failures of pipelines as a result of corrosion have led to heavy loss [1]. Certain quantum chemical indices which are calculated by computational chemistry programs can be associated with metal/inhibitor reactions These are the HOMO energy, LUMO energy, and the gap energy ΔE (ΔE = ELUMO - EHOMO) and dipole moment (μ). The first goal of this study is to examine the inhibition efficiency of three synthesized cationic Gemini surfactants, namely, A312, A314, and A316, in which the two cationic head groups are linked by rigid spacer containing Schiff base, on the corrosion behavior of API X52 steel pipeline in 1 M HCl. The second goal is to identify the relation between the experimental inhibition efficiency and theoretical chemical parameters obtained by computational calculation in order to predict of the behavior of the organic compounds as corrosion inhibitors
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