IJNCSE - SPECIAL ISSUE - ICCER 2015

INTERNATIONAL JOURNAL OF NANO CORROSION SCIENCE ENGINEERING

SPECIAL ISSUE

ICCER 2015

ISSN :2395 – 7018


Research Article

TITLE :

Antagonistic effects of polyacrylic acid with Sodium gluconate and Zn2+ for corrosion control of mild steel in aqueous solution

AUTHORS

V. Dharmalingam1*, P. Arockia Sahayaraj1, A. John Amalraj1, S. Rajendran2

[1] PG and Research Department of Chemistry, Periyar E.V.R College (Autonomous),
Tiruchirappalli - 620023, Tamilnadu, India.
[2] RVS School of Engineering and Technology, Dindigul - 624 005, Tamilnadu, India.
Corresponding author: dharma.nalli@gmail.com

ABSTRACT

The inhibition effect of Polyacrylic acid (PAA), Sodium gluconate (SG), and Zn2+ ions on the corrosion of mild steel in 60 ppm Cl- medium has been investigated by gravimetric studies, Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The investigations revealed that SG acts as an Optimum in the inhibition effiency (98 %) is observed for a concentration close to 100 ppm, addition of increase in SG concentration decrease the inhibition efficiency. which is ascribed to the formation of hemi-micellar aggregates that intensify inhibitor desorption from the metal/solution interface higher concentrations. These concentration regions shows antagonistic behaviour are identified. 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, AFM) are also used to ascertain the nature of the protective film. The mechanical aspect of corrosion inhibition is proposed.

Keywords:Polyacrylic acid, Sodium gluconate, Mild steel, Polarization, EIS, FT-IR, AFM, Antagonism.

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