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Asian Journal of Research in Chemistry
Year : 2016, Volume : 9, Issue : 1
First page : ( 40) Last page : ( 46)
Print ISSN : 0974-4169. Online ISSN : 0974-4150.
Article DOI : 10.5958/0974-4150.2016.00008.0

Electrochemical Study and Spectroscopic Methods used for Self Assembling Nanofilm Formed by Polyacrylic Acid on Mild Steel in Aqueous Environment

Dharmalingam V.1, Sahayaraj P. Arockia1,*, Amalraj A. John1, Prema A. Angelin2, Rajendran S.3

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

*Corresponding Author E-mail: sahaiangel@gmail.com

Online published on 9 March, 2016.

Abstract

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.

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Keywords

Polyacrylic acid, Mild steel, Polarization, EIS, FT-IR, SEM, EDS, AFM.

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