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Synergistic and biocidal effects of 1‐hydroxyethane ‐1, 1‐diphosphate, Zn2+ and polycrylamide on the inhibition of corrosion of mild steel in neutral aqueous environment

S. Rajendran (S. Rajendran is grateful to the University Grants Commision, New Delhi, India, for financial assistance, to the Executive Director, Sasha Industries Ltd, Dindigul, to Mr Ranjit Soundarajan, the Correspondent Prof, S. Ramakrishnan, the Prinicipal, and Prof. P. Jayaram, Head of the Chemistry Department, GTN. Arts College, Dindigul, to Dr S. Maruthamuthu and Dr R. Jegannathan, CECRI, Karaikudi, and to Prof. G. Karthikeyan, Head of the Chemistry Department, Gandhigram University, for their help)
B.V. Apparao (Department of Chemistry, Regional Engineering College, Warangal, Andhrapradesh, India)
N. Palaniswamy (Corrosion Science and Engineering Division, Central Electrochemical Research Institute, Karaikudi, Tamilnadu, India)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 August 1998

254

Abstract

The formulation consisting of 300ppm 1‐hydroxyethane‐1, 1‐diphosphonic acid (HEDP), 50ppm polyacrylamide (PAA) and 50 ppm Zn2+ offered 99 per cent corrosion inhibition and 99 to 99.9 per cent biocidal inhibition to mild steel in neutral aqueous environment containing 60ppm Cl‐ , a situation commonly encountered in cooling water systems. The nature of the protective film formed on the metal surface was analysed using X‐ray diffraction, UV‐visible reflectance, FTIR and luminescence spectra. The film was found to be luminescent and to consist of Fe2+ ‐HEDP complex, Fe2+ ‐PAA complex and Zn(OH)2.

Keywords

Citation

Rajendran, S., Apparao, B.V. and Palaniswamy, N. (1998), "Synergistic and biocidal effects of 1‐hydroxyethane ‐1, 1‐diphosphate, Zn2+ and polycrylamide on the inhibition of corrosion of mild steel in neutral aqueous environment", Anti-Corrosion Methods and Materials, Vol. 45 No. 4, pp. 256-261. https://doi.org/10.1108/00035599810223805

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MCB UP Ltd

Copyright © 1998, MCB UP Limited

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