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Vol. 29 No. 12 (2017): Vol 29 Issue 12

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Evaluation of Synergism in Sodium Tungstate/Sodium Silicate - (PA-Zn2+) System for Mitigating Mild Steel Corrosion in Industrial Cooling Water System

https://doi.org/10.14233/ajchem.2017.20875
Athira Krishnan
Department of Chemistry, Amrita University, Amritapuri-690 525, India
S.M.A. Shibli
Department of Chemistry, University of Kerala, Kariavattom Campus, Thiruvananthapuram-695 581, India
S. Akashnath
Department of Chemistry, Amrita University, Amritapuri-690 525, India
Aravind Chithi
Department of Chemistry, Amrita University, Amritapuri-690 525, India
A.N. Vanikrishna
Department of Chemistry, Amrita University, Amritapuri-690 525, India
S. Vinayak
Department of Chemistry, Amrita University, Amritapuri-690 525, India

Corresponding Author(s) : Athira Krishnan

athikrishnan91@gmail.com

Asian Journal of Chemistry, Vol. 29 No. 12 (2017): Vol 29 Issue 12

Abstract

Mild steel was extensively used in many industrial applications for the last few decades. Industries depend water particularly for cooling machines and other equipments to a temperature that allow manufacturing process to keep going, washing machineries etc. The dissolved oxygen present in water accelerates corrosion of steel equipments. Therefore it was absolutely needed to develop eco-friendly inhibitors having low cost and high efficiency in cooling water system that work even under accelerated conditions. Here we took PA-Zn2+ solution as the basic inhibitive system and then evaluated the role of different concentrations of sodium tungstate (ST) and sodium silicate (SS) in the optimum PA-Zn2+ combinations in neutral aqueous environment at normal as well as stimulated environment. Synergistic action of sodium tungstate and sodium silicate along with PA-Zn2+ system in the corrosion inhibition of mild steel was carried out by physico chemical and electro-chemical methods such as weight loss measurement, potentiodynamic polarization, open circuit potential measurement, electrochemical impedance spectroscopy etc. Based on the results of analysis we proposed a mechanism of passivation. 200 ppm sodium tungstate and 500 ppm sodium silicate exhibited optimum inhibitive action with 50 ppm phthalic acid - 60 ppm Zn2+ system and the values of efficiencies were found to be 99.04 and 96.1 % respectively. The composition of protective film was identified by IR spectroscopy and its homogenous nature was confirmed by the bode plots. The study confirmed that optimum combinations possessed excellent inhibitive power even under vigorous conditions and thereby proved the importance of PA+Zn2+-ST/SS as corrosion inhibitor and suitability to use in industrial cooling water system.

Keywords

Corrosion inhibitors Phthalic acid-Zn2 Sodium tungstate Sodium silicates Passive film
Krishnan, A., Shibli, S., Akashnath, S., Chithi, A., Vanikrishna, A., & Vinayak, S. (2017). Evaluation of Synergism in Sodium Tungstate/Sodium Silicate - (PA-Zn2+) System for Mitigating Mild Steel Corrosion in Industrial Cooling Water System. Asian Journal of Chemistry, 29(12), 2755–2760. https://doi.org/10.14233/ajchem.2017.20875
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