Rajendran, S. and Apparao, B.V. and Palaniswamy, N. (1997) Synergistic and biocidal effects of HEDP-Zn2+ - CTAB system on the inhibition of corrosion of mild steel in neutral aqueous environment. Bulletin of Electrochemistry, 13 (12). pp. 441-447. ISSN 0256-1654

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Abstract

The synergistic effect of HEDP and Zn2+ on the inhibition of corrosion of mild steel in neutral aqueous environment containing 60 ppm chloride has been evaluated by the classical weight-loss method. It is found that the formulation consisting of 50 ppm HEDP and 50 ppm Zn2+ offers an inhibition efficiency of 98%. Addition of a biocide viz., N-cetyl-N, N, N-trimethylammonium bromide (CTAB), to the above formulation, upto a concentration of 100 ppm does not reduce the inhibition efficiency. It is interesting to note that the formulation consisting of 50 ppm HEDPP, 50 ppm Zn2+ 50 ppm CTAB has 99% corrosion inhibition efficiency and 100% biocidal efficiency. The mechanistic aspects of corrosion inhibition have been studied, in a holistic way, based on the results obtained from polarisation study, X-ray diffraction technique, uv-visible reflectance, FTIR and luminescence spectra. It is observed that the protective film consists of Fe2+ - HEDP complex, Fe2+ - CTAB complex and Zn(OH)2. The protective film is found to be luminescent

Item Type:	Article
Uncontrolled Keywords:	HEDP - Zn2+ - CTAB; Biocide; Corrosion inhibition; Synergistic effect; Neutral aqueous medium
Subjects:	Corrosion Science and Engineering
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	25 May 2012 09:12
Last Modified:	25 May 2012 09:12
URI:	http://cecri.csircentral.net/id/eprint/2760

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