Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 144, Issue -, Pages 305-315Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.12.106
Keywords
CO2 corrosion; J55 tubular steel; Scanning Kelvin probe; Chitosan; Electrochemical measurements
Funding
- Research and Development (R&D) Program (Research Pooling Initiative), Ministry of Education, Riyadh, Saudi Arabia
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An eco-friendly Schiff base, namely Salicylaldeyde-Chitosan Schiff Base (SCSB), was synthesized by the reaction of chitosan and salicylaldehyde. In 3.5% NaCl saturated with carbon dioxide at 65 degrees C corrosion inhibition effect was analyzed using weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods. The PDP results revealed that SCSB acts as a mixed type inhibitor and reduces the corrosion process effectively at 150 mg L-1 concentration with an inhibition efficiency of 95.2% and corrosion rate of 0.444 mm/y. EIS measurements suggest that the corrosion inhibition process is kinetically controlled. Langmuir adsorption model is the best fit among the other tested isotherms. The surface analysis was carried out using scanning electron microscopy (SEM), atomic force microscopy (AFM), scanning Kelvin probe (SKP), and X-ray photoelectron spectroscopy (XPS) to corroborate the formation of inhibitor film on the metal surface. Computational studies showed the effective adsorption of the protonated form of inhibitor. (C) 2019 Elsevier B.V. All rights reserved.
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