Abstract
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•GlP and GaP ecofriendly epoxy resins were synthesized and identified by FTIR analysis.•GlP and GaP used present higher protective efficiencies (for EIS and PDP) compared with 1 M HCl only.•SEM/AFM analysis displayed that the GlP and GaP could effectively block the Cl− ions attack by chemisorption on the CS surface.•DFT, MDs, RDF, FFV and experimental results lead to investigate GlP and GaP as a potential inhibitors for CS in HCl solution.
An ecofriendly epoxy resins derivatives namely tetraglycidyl methyl -β-D-glucopyranoside (GlP) and tetraglycidyl methyl -β-D-galactopyranoside (GaP) were synthesized and characterized. The corrosion protection of GlP and GaP on carbon steel in a corrosive electrolyte (1 M HCl medium) was investigated using Fourier transform infrared (FTIR), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), temperature effect (TE), scanning electron microscopy (SEM), atomic force microscopy (AFM), density function theory (DFT), molecular dynamics (MD) simulations, fractional free volume (FFV) and radial distribution function (RDF). The EIS results show that the two GlP and GaP have excellent inhibitory efficiency and GlP (93.65%) higher than GaP (93.08%) at 10−3 M. SEM and AFM analysis illustrated that the protective layer formed on CS surface in the presence of GlP and GaP could be stopped the chloride ions attack. FFV value of GlP films (34.20%) is lower than compared to GaP (34.31%), due to the most condensed film by the GlP epoxy resin on CS surface.