Abstract
In this study, we have developed corrosion protective coatings material from Pongamia glabra seed oil. First, oil was converted to pongamia oil epoxy (POE). The resin was synthesized by the reaction of POE with phthalic acid to develop polyester (PE) and further treated with diethylene triamine (DTA) in different (20-35%wt) amount. The structural elucidation of POE and PE were carried out by FT-IR, 1H-NMR and 13C-NMR spectroscopic techniques. Thermal behavior of PE-30 was studied by thermogravimetric analyses (TGA) and differential scanning calorimetry (DSC). The coatings of PE-DTA resins were prepared on mild steel strips to investigate their physico-mechanical and corrosion performance. Corrosion protection of coated panels were examined in different corrosive media (3.5 wt% HCl, 3.5 wt% NaOH, 5.0 wt% NaCl) using potentiodynamic polarization and AC impedance. Thermal analyses revealed that PE-30 may find application as eco-friendly corrosion protective coating safely used up to 175 degrees C.