Corrosion behaviour of carbon steel in the presence of N‐cetyl‐N,N,N‐trimethylammonium bromide, Zn²⁺ and calcium gluconate

Abstract

The inhibition efficiency of N‐cetyl‐N,N,N‐trimethylammonium bromide (CTAB), a cationic surfactant, in controlling the corrosion of carbon steel in an aqueous solution containing 60ppm Cl^–, in the absence and presence of Zn²⁺ and also calcium gluconate (CG), had been evaluated by the weight‐loss method. Weight‐loss studies revealed that the behaviour of CTAB changed when its concentration is ≥ 150ppm. Organisation of assembly of CTAB molecules is expected to take place at this critical concentration. The protective film has been analysed using FTIR spectra. In the presence of CTAB, the protective film consists of Fe²⁺‐CTAB complex. In the presence of CTAB and Zn²⁺, the protective film consists of Fe²⁺‐CTAB complex and Zn(OH)₂. In the presence of CTAB and calcium gluconate, the protective film consists of Fe²⁺‐CTAB complex, Fe²⁺‐gluconate complex and Ca(OH)₂.

Citation

Manjula, P., Manonmani, S., Jayaram, P. and Rajendran, S. (2001), "Corrosion behaviour of carbon steel in the presence of N‐cetyl‐N,N,N‐trimethylammonium bromide, Zn²⁺ and calcium gluconate", Anti-Corrosion Methods and Materials, Vol. 48 No. 5, pp. 319-324. https://doi.org/10.1108/EUM0000000005883