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Title: Corrosion inhibition and biocidal activity of a cationic surfactant
Authors: Shanthy, P
Rengan, P
Chelvan, A Thamarai
Rathika, K
Rajendran, S
Keywords: Corrosion inhibition
Carbon steel
Biocidal activity
N-Cetyl-N,N,N-trimethyl ammonium bromide (CTAB)
CTAB-Zn2+ system
Issue Date: Jul-2009
Publisher: CSIR
Abstract: The inhibition efficiency (IE) of CTAB - Zn2+ system in controlling corrosion of carbon steel in well water has been evaluated by weight loss method. Enumeration of microorganisms from well water and biocidal efficiency of inhibitor system (CTAB-Zn2+) were also determined by serial dilution technique and spread plate method. The formulation consisting of 200 ppm of CTAB and 5 ppm of Zn2+ shows an IE of 98%. Potentiodynamic polarization curves indicate that the CTAB – Zn2+ system functions as anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra suggest that the protective film consists of Fe2+- CTAB complex and Zn(OH)2. The optimum concentration of CTAB for destroying the bacterias viz. E.coli, Salmonella and Shigella is ³ 25 ppm. At ³ 25 ppm of CTAB, it shows 100% biocidal efficiency in well water containing 5 ppm of Zn2+.
Page(s): 328-333
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.16(4) [July 2009]

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