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Mechanism of corrosion inhibition by the 2‐chloroethyl phosphonic acid – Zn2+ system

S. Rajendra (S. Rajendran is a Professor of Chemistry at the Department of Chemistry, GTN Arts College (autonomous), Tamil Nadu, India.)
B.V. Apparao (B.V. Apparao is a Professor of Chemistry at the Department of Chemistry, Regional Engineering College, Andhrapradesh, India.)
N. Palaniswamy (N. Palaniswamy is a Scientist at the Corrosion Science and Engineering Division, Central Electrochemical Research Institute, Tamil Nadu, India.)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 June 2000

Abstract

The synergistic effect of sodium salt of 2‐chloroethyl phosphonic acid (2‐Cl EPA) and Zn2+, in controlling corrosion of carbon steel in a neutral aqueous environment containing 60ppm Cl, was evaluated by weight‐loss and electrochemical methods. A formulation consisting of 300ppm 2‐Cl EPA and 300ppm Zn2+ was observed to deliver 95 percent inhibition efficiency. A suitable mechanism of corrosion inhibition has been proposed which is based on the results obtained from polarization study and uv‐visible absorption and reflectance spectra. 2‐Cl EPA‐Zn2+ system appears to function as a mixed inhibitor. The protective film consisted of Fe2+ ‐2‐Cl EPA complex, Zn(OH)2 and oxides of iron. The film was found to be semiconducting in nature.

Keywords

Citation

Rajendra, S., Apparao, B.V. and Palaniswamy, N. (2000), "Mechanism of corrosion inhibition by the 2‐chloroethyl phosphonic acid – Zn2+ system", Anti-Corrosion Methods and Materials, Vol. 47 No. 3, pp. 147-151. https://doi.org/10.1108/00035590010334106

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