Aspartame as a Green and Effective Corrosion Inhibitor for T95 Carbon Steel in 15 wt.% HCl Solution
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MDPI
Abstract
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Oil well acidizing, although a stimulation process, induces the corrosion of metallic
equipment and well tubing. There is, at present, a high demand for effective and less toxic hightemperature
corrosion inhibitors for the acidizing process due to the failing of the existing inhibitors
at high temperatures occasioned by increases in the well depths. In this study, aspartame (ASP), a
commercially available natural compound, is examined as a corrosion inhibitor for T95 carbon steel
in 15 wt.% HCl solution at 60, 70, 80, and 90 �C using the weight loss, electrochemical impedance
spectroscopy (EIS), potentiodynamic polarization (PDP), scanning electron microscope (SEM), energy
dispersive spectroscopy (EDX), and optical profilometry (OP) techniques. It was found that ASP
possesses a corrosion inhibiting effect at the studied conditions. Inhibition efficiency increased with
increases in temperature. With 2000 ppm ASP, inhibition efficiency of 86% was achieved from the
weight loss method at 90 �C after 4 h of immersion. Results from the electrochemical techniques
are in good agreement with the weight loss results. PDP results reveal that ASP acted as a mixedtype
corrosion inhibitor under the investigated conditions. The inhibition ability of ASP is due to
adsorption on the steel surface and has been confirmed by the SEM, OP, and EDX results. ASP is a
promising active compound for the formulation of acidizing corrosion inhibitors.
Keywords
QD Chemistry