Synthesis, characterization and corrosion protection properties of poly(N-(acryloyloxymethyl) benzotriazole-co-glycidyl methacrylate) coatings on mild steel

The synthesis of copolymers from different feed ratios of N-(acryloyloxymethyl) benzotriazole (AMBT) and glycidyl methacrylate (GMA) was achieved by using free radical solution polymerization technique and characterised using FT-IR and 13C NMR spectroscopy. The thermal stability of the synthesized copolymers was studied using theremogravimetrtic analysis (TGA). The corrosion performances of mild steel specimens dip coated with different composition of copolymers were investigated in 0.1 M HCl by using potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) method. The polarization and impedance measurements showed different corrosion protection efficiency with change in composition of the copolymers. It was found that the corrosion protection properties are owing to the barrier effect of the polymer layer covered on the mild steel surfaces. However, it was observed that the copolymer obtained from 1:1 mole ratio of AMBT and GMA exhibited better protection efficiency than other combinations.