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Corrosion Inhibition of Mild Steel by Calcium Gluconate in Simulated Cooling Water

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Author(s): Siragul KARIM | Chand Mohammad MUSTAFA | Md. ASADUZZAMAN | Mayeedul ISLAM

Journal: Leonardo Electronic Journal of Practices and Technologies
ISSN 1583-1078

Volume: 9;
Issue: 16;
Start page: 167;
Date: 2010;
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Keywords: Corrosion inhibition | Potentiodynamic sweep | Inhibitor | Ca-gluconate | Simulated cooling water

ABSTRACT
Corrosion inhibition of the mild steel by calcium gluconate in simulated cooling water, SCW containing chloride ion was investigated. Electrochemical techniques such as corrosion potential (Ecorr.) measurement and potentiodynamic sweep experiments were used. The experimental parameters were concentration of the inhibitor, pH of the aqueous media and soaking time. Ca-gluconate inhibits mild steel corrosion in near neutral and alkaline (at pH 6 and above) SCW and accelerates corrosion in acidic media (at pH 4 and below). Inhibition activity increases with the increase of gluconate concentration at pH 6 and above and decreases at pH 4 and below. In stagnant SCW, maximum corrosion inhibition was observed at pH 12 for all concentration of Ca-gluconate. Inhibitive action was increased with the increase of soaking time up to six hours and afterwards it remained more or less constant at all concentrations of Ca-gluconate at and above pH 6. Based on the experimental results, mechanisms of action of Ca-gluconate on mild steel corrosion inhibition in SCW have been proposed.
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