Corrosion Inhibition of Rumex vesicarius Mediated Chitosan-AgNPs Composite for C1018 CS in CO2-Saturated 3.5% NaCl Medium under Static and Hydrodynamic Conditions
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MDPI Switzerland
Abstract
Description
Rumex vesicarius (RVE) mediated chitosan–AgNPs composite was produced in situ by
using an aqueous extract of Rumex vesicarius leaves as the reducing agent to reduce Ag+ to Ag0. The
synthesized composite was evaluated as a sweet (CO2) corrosion inhibitor (CI) for C1018 carbon steel
(CS) in 3.5 wt% NaCl solution under static and hydrodynamic conditions. The corrosion inhibitive
performance was evaluated using electrochemical impedance spectroscopy (EIS), linear polarization
resistance (LPR), and potentiodynamic polarization (PDP) techniques, as well as scanning electron
microscopy (SEM)/energy dispersive X-ray spectroscopy (EDAX), and atomic force microscopy
(AFM) on corroded C1018 CS without and with additives. The effect of concentration, immersion
time, temperature, and rotation speed on the CI performance of the composite was also investigated.
The corrosion inhibitive effect increased with increasing composite dosage, with the highest inhibition
efficiency (IE) acquired at the maximum composite dosage of 0.3%. Beyond this concentration, the
IE decline with increasing concentration. Furthermore, IE was found to increase with immersion
time and decline with a temperature rise from 25 to 40 �C, with the optimum temperature of 60 �C
found to accelerate corrosion without and with RVE-mediated Chi–AgNPs composite. Under high
shear stress, the Chi–AgNPs composite exhibits moderate corrosion inhibition under hydrodynamic
conditions. The surface analysis results validate the formation of a protective covering due to
composite adsorption on the CS surface. The RVE-mediated chitosan–AgNPs composite could be
recommended as a CI for C1018 CS in sweet (CO2) corrosion environments at ambient temperature
Keywords
QD Chemistry