1PG and Research, Department of Chemistry, Periyar E.V.R College (Autonomous), Tiruchirappalli-620 023, Tamil Nadu, India
2PG and Research, Department of Physics, Periyar E.V.R College (Autonomous), Tiruchirappalli-620 023, Tamil Nadu, India
3RVS School of Engineering and Technology, Dindigul-624 005, Tamil Nadu, India
Inhibition of mild steel corrosion in 60 ppm chloride medium by Polyacrylic acid (PAA), Trisodium citrate Zn2+ (TSC) and ions was investigated by weight loss measurement, potentiodynamic polarization, electrochemical impedance studies (EIS), Fourier transform infrared spectroscopy (FT-IR), Scanning electron spectroscopy (SEM), Energy dispersive X-Ray spectroscopy (EDS) and Atomic force microscopy (AFM). The results indicated that the TSC acts as an optimum in the inhibition efficiency (95%) is observed for a concentration close to 100 ppm, addition to increase in TSC concentration decrease the inhibition efficiency. Potentiodynamic polarization studies inferred that this mixture functions as a cathodic inhibitor. EIS studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of mild steel. Surface characterization techniques (FT-IR, SEM, EDS and AFM) are also used to ascertain the nature of the protective film. The mechanical aspect of corrosion inhibition is proposed.
Polyacrylic acid, Mild steel, Polarization, EIS, FT-IR, SEM, EDS, AFM
