Synthesis Characterization and Highly Protective Efficiency of Tetraglycidyloxy Pentanal Epoxy Prepolymer as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl Medium

Rachid Hsissou; Redouane Lachhab; Anouar El Magri; Siham Echihi; Hamid Reza Vanaei; Mouhsine Galai; Mohamed Ebn Touhami; Mohamed Rafik

doi:10.3390/polym14153100

Synthesis Characterization and Highly Protective Efficiency of Tetraglycidyloxy Pentanal Epoxy Prepolymer as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl Medium

Polymers (Basel). 2022 Jul 30;14(15):3100. doi: 10.3390/polym14153100.

Authors

Rachid Hsissou¹, Redouane Lachhab², Anouar El Magri³, Siham Echihi⁴, Hamid Reza Vanaei⁵, Mouhsine Galai², Mohamed Ebn Touhami², Mohamed Rafik¹

Affiliations

¹ Laboratory of Organic Chemistry, Catalysis and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 242, Kenitra 14000, Morocco.
² Laboratory of Advanced Materials and Process Engineering, Faculty of Sciences, Ibn Tofail University, BP 242, Kenitra 14000, Morocco.
³ Euromed Polytechnic School, Euromed Research Center, Euromed University of Fes, Route de Meknès (Rond point Bensouda), Fès 30000, Morocco.
⁴ Laboratory of Materials Engineering for the Environment and Natural Resources, Faculty of Sciences and Techniques, University Moulay Ismail of Meknes, BP 509 Boutalamine, Errachidia 52000, Morocco.
⁵ Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France.

Abstract

Anticorrosive protection efficiency of novel tetrafunctional epoxy prepolymer, namely 2,3,4,5-tetraglycidyloxy pentanal (TGP), for mild steel in 1 M HCl medium was assessed through potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), contact angle (CA), adsorption isotherm model, temperature effect and thermodynamic parameters. The synthesized TGP was characterized and confirmed by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR). The inhibitory efficiencies found at lower concentration of the prepolymer TGP were85% (PDP) and 87.17% (EIS). PDP measurement illustrated that the TGP behaved as a mixed-type inhibitor in the realized solution. SEM and EDS analysis showeda significant decrease in the corrosion of the MS surface in the presence of the inhibitory prepolymer compared with the blank (1 M HCl). Langmuir adsorption isotherm is the most acceptable modelto describe the TGP epoxy prepolymer on the MS area.

Keywords: FTIR/NMR characterization; Langmuir adsorption; PDP/EIS measurements; SEM/EDS/CA analyses; anticorrosive protection; epoxy prepolymer TGP; synthesis.

Grants and funding

This research received no external funding.