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|Title:||Corrosion inhibition and biocidal activity of a cationic surfactant|
Chelvan, A Thamarai
<i>N</i>-Cetyl-<i>N,N,N</i>-trimethyl ammonium bromide (CTAB)
|Abstract:||The inhibition efficiency (IE) of CTAB - Zn<sup>2+</sup> 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-Zn<sup>2+</sup>) were also determined by serial dilution technique and spread plate method.<b> </b>The formulation consisting of 200 ppm of CTAB and 5 ppm of Zn<sup>2+</sup> shows an IE of 98%. Potentiodynamic polarization curves indicate that the CTAB – Zn<sup>2+</sup> 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 Fe<sup>2+</sup>- CTAB complex and Zn(OH)<sub>2</sub>. The optimum concentration of CTAB for destroying the bacterias <i>viz</i>. <i>E.coli</i>, <i>Salmonella</i> and <i>Shigella</i> is ³ 25 ppm. At ³ 25 ppm of CTAB, it shows 100% biocidal efficiency in well water containing 5 ppm of Zn<sup>2+</sup>.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.16(4) [July 2009]|
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