Synthesis and performance of two ecofriendly epoxy resins as a highly efficient corrosion inhibition for carbon steel in 1 M HCl solution: DFT , RDF, FFV and MD approaches

An ecofriendly epoxy resins derivatives namely tetraglycidyl methyl -beta-D-glucopyranoside (GlP) and tetraglycidyl methyl -beta-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.

Automated summary

Ecofriendly epoxy resins derivatives GlP and GaP were synthesized and their corrosion protection properties on carbon steel were investigated. The results showed that GlP and GaP have excellent inhibitory efficiency and can effectively prevent chloride ion attack.