Cinnamaldehyde-modified chitosan as a bio-derived corrosion inhibitor for acid pickling of copper: Microwave synthesis, experimental and computational study

• Published in: International journal of biological macromolecules 2020-12, Vol.164, p.3709-3717
• Main Authors: EL. Mouaden, Khadija, Chauhan, Dheeraj Singh, Quraishi, M.A., Bazzi, Lahcen, Hilali, Mustapha
• Format: Article
• Language: English
• Subjects: Acrolein - analogs & derivatives; Acrolein - chemistry; Acrolein - pharmacology; Adsorption - drug effects; Chitosan; Chitosan - chemistry; Chitosan - pharmacology; Computational Biology; Copper - chemistry; Corrosion; Electrochemical impedance spectroscopy; Electrochemical Techniques; Electrostatic potential; Hydrochloric Acid - adverse effects; Hydrochloric Acid - chemistry; Microscopy, Electron, Scanning; Microwaves; Monte Carlo simulations; Schiff Bases - chemistry; Steel - chemistry; Surface Properties - drug effects
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2020.08.137

Chitosan (CS) was cross-linked using cinnamaldehyde (Cinn) in a single step procedure following microwave irradiation to produce cinnamaldehyde-modified chitosan (Cinn-CS). The synthesized Cinn-CS was used as a novel corrosion inhibitor for copper in 1 M hydrochloric acid. A comprehensive electrochemical investigation using the impedance measurements, and potentiodynamic polarization was undertaken, supported with surface analysis and computational studies. The inhibitor Cinn-CS functioned by adsorption on the copper surface and showed an inhibition efficiency of >89% at a dose of 1000 mgL−1. The charge transfer resistance showed a rise with increase in inhibitor dosage to the corrosive medium, and the corrosion currents showed a significant decrease with the addition of the inhibitor. The Cinn-CS displayed a mixed type of inhibition performance with cathodic nature. The study of the copper surface using scanning electron microscopy depicted a considerably smooth morphology in the presence of the adsorbed Cinn-CS. The computational studies indicated that the Cinn-CS Schiff base shows better adsorption behavior compared to the parent molecules of chitosan and cinnamaldehyde and can show an inhibition performance in the neutral, and the protonated form. [Display omitted]