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Influence of a cationic surfactant on the inhibition efficiency of calcium gluconate – Zn2+ system

S. Rajendran (S. Rajendran is based in the Corrosion Study Centre, Department of Chemistry, G.T.N. Arts College (Autonomous), Tamil Nadu, India.)
B.V. Apparao (B.V. Apparao is based in the Department of Chemistry, Regional Engineering College, Andhrapradesh, India.)
N. Palaniswamy (N. Palaniswamy is based in 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 February 2000

Abstract

The influence of a cationic surfactant, N‐cetyl‐N, N, N‐trimethyl ammonium bromide (CTAB) on the inhibition efficiency (IE) of calcium gluconate (CG) – Zn2+ system in controlling corrosion of mild steel in a neutral aqueous environment containing 60ppm Cl has been evaluated by weight‐loss method. The formulation consisting of 200 ppm CG and 50ppm Zn2+ has 86 per cent IE (immersion period = three days). Addition of various concentrations of CTAB to the above system improves the IE to 99 per cent. Presence of CTAB facilitates the transport of CG and Zn2+ from the bulk of the solution to the metal surface. The nature of the protective film formed on the surface of mild steel has been analysed by FTIR and fluorescence spectra. The protective film is found to be fluorescent and to consist of iron‐CG complex, iron‐CTAB complex and Zn(OH)2.

Keywords

Citation

Rajendran, S., Apparao, B.V. and Palaniswamy, N. (2000), "Influence of a cationic surfactant on the inhibition efficiency of calcium gluconate – Zn2+ system", Anti-Corrosion Methods and Materials, Vol. 47 No. 1, pp. 11-14. https://doi.org/10.1108/00035590010309951

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MCB UP Ltd

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