Microwave assisted green synthesis of bis-phenol polymer containing piperazine as a corrosion inhibitor for mild steel in 1M HCl

Abstract

Microwave-assisted organic synthesis involves simple work procedure and gives high yield of product. In view of this we have synthesized bis-phenol formaldehyde polymer containing piperazine by microwave technique and investigated its inhibition action on corrosion of mild steel in 1 M HCl using gravimetric, electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiodynamic polarization techniques. The Tafel polarization study reveals that inhibitor acts as mixed-type inhibitor. EIS study indicates that it inhibits corrosion by adsorption mechanism. The adsorption of polymer on mild steel followed Langmuir adsorption isotherm. In optical microscopy examination inhibited mild steel surface was found to be smoother than uninhibited mild steel surface. © 2013 by ESG.