The Role of 1-Hydroxyethane –1, 1-Diphosphonic Acid on Corrosion Inhibition Performance of Calcium Gluconate in Mild Steel

K. Sreevalsan¹*, V. Anithakumary² and I. G. Shibi³

¹Based at the Post Graduate and Research Department of Chemistry, Sree Narayana College, Kollam.

²Based at the Post Graduate and Research Department of Chemistry, Sree Narayana College for Women, Kollam.

³Based at the Post Graduate Department of Chemistry, Sree Narayana College, Chempazhanthy.

ABSTRACT:

The corrosion rate of mild steel in low corrosive tap water in the absence and presence of 1-hydroxy ethane-1, 1-diphosphonic acid (HEDP) and calcium gluconate have been evaluated by weight loss, electrochemical polarization and AC impedance measurements. Presence of calcium gluconate considerably enhanced the corrosion inhibition efficiency of the widely used water treatment agent HEDP. At higher concentrations (>50ppm), HEDP was found to be aggressive towards mild steel. But a formulation consisting of 25ppm HEDP and 200ppm calcium gluconate was found to protect mild steel effectively.

KEYWORDS:

Corrosion inhibitor; mild steel; HEDP; calcium gluconate

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Copy the following to cite this article: K. Sreevalsan K, Anithakumary V, Shibi I. G. The Role of 1-Hydroxyethane –1, 1-Diphosphonic Acid on Corrosion Inhibition Performance of Calcium Gluconate in Mild Steel. Orient J Chem 2008;24(2).

Copy the following to cite this URL: K. Sreevalsan K, Anithakumary V, Shibi I. G. The Role of 1-Hydroxyethane –1, 1-Diphosphonic Acid on Corrosion Inhibition Performance of Calcium Gluconate in Mild Steel. Orient J Chem 2008;24(2). Available from: http://www.orientjchem.org/?p=24380/a>.