Synthesis and Characterization of PolyEthylene Glycol-g-Arginine and its Corrosion - Inhibition Behaviour on Mild Steel

Aqueous chemical process is an environment-friendly efficient technique used to prepare conducting polymers. It is widely preferred because of its simplicity and it can be used as one step method. A polymer was prepared by grafting amino acid Arginine (A) on polyethylene glycol (PEG) in different ratios. The structure of the polymer composite was characterized using FT-IR, X-Ray diffraction and UV absorption spectroscopy. The water soluble polymers gained attraction of the researchers in the corrosion inhibition because of the available lone pair of electrons. In the present study, water-soluble PEG-g-A is explored for its inhibitive action on mild steel corrosion in acid media. The polymer was evaluated using polarization studies and electrochemi cal impedance spectroscopy. The evaluation revealed that the polymer as an effective mixed-type inhibitor in the HCl and H2SO4 media. The charge transfer resistance and double layer capacitance values confirmed the adsorption of the polymer on the metal surface. The open circuit potential study proved the formation of polymer film on the metal surface and the stability of the formed film.