Abstract
A new class of corrosion inhibitors, namely, polyethyleneiminemethylene phosphonic acid (PEIMPA), was synthesized and its inhibiting action on the corrosion of C38 steel in 1 M HCl at 30 °C was investigated by various corrosion monitoring techniques such as weight loss measurements, potentiodynamic polarization, linear polarization resistance (Rp), and surface analysis (SEM and EDX) which are used to characterize the steel surface. Weight loss measurements revealed that the presence of PEIMPA increases the inhibition efficiency by decreasing the corrosion rate. Tafel polarization study showed that the inhibitor acts as a mixed-type inhibitor. Adsorption of PEIMPA on the carbon steel surface was found to obey the Langmuir isotherm. Some thermodynamic functions of dissolution and adsorption processes were also determined and discussed. The SEM results showed the formation of protective film on the mild steel surface in the presence of PEIMPA. The results obtained from different tested techniques were in good agreement.
Highlights
Study of organic corrosion inhibitor is an attractive field of research due to its usefulness in various industries
A new class of corrosion inhibitors, namely, polyethyleneiminemethylene phosphonic acid (PEIMPA), was synthesized and its inhibiting action on the corrosion of C38 steel in 1 M HCl at 30 °C was investigated by various corrosion monitoring techniques such as weight loss measurements, potentiodynamic polarization, linear polarization resistance (Rp), and surface analysis (SEM and EDX) which are used to characterize the steel surface
The gravimetric measurements of mild steel in 1 M HCl in the absence and presence of various concentrations of PEIMPA investigated were determined after 4 h of immersion at 30 °C
Summary
Study of organic corrosion inhibitor is an attractive field of research due to its usefulness in various industries. The influence of polyethyleneiminemethylene phosphonic acid (PEIMPA) as a corrosion inhibitor of carbon steel in 1 M HCl has been systematically studied by weight loss measurements, potentiodynamic polarization studies, and surface analysis (SEM, EDX). Scheme 1 Synthesis of polyethyleneiminemethylene phosphonic acid from Lupasol P performed in distilled water under microwave irradiation. For the weight loss measurements, the experiments were carried out in the solution of 1 M HCl (uninhibited and inhibited) on carbon steel containing 0.30–0.35% C, 0.15–0.35% Si, 0.035% S, 0.5–1.0% Mn, and 0.035% P. Ð1Þ w where w and w0 are the corrosion rate of steel due to the dissolution in 1 M HCl in the absence and the presence of definite concentrations of inhibitor, respectively. The surface morphology of the samples before and after adding PEIMPA inhibitor in the medium 1 M HCl after 1 day of immersion was observed by scanning electron microscope (SEM) Quanta 200 FEG coupled with EDX analysis
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