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Title: Corrosion inhibition of carbon steel by adipic acid – Zn<sup>2+</sup> system
Authors: Florence, G Ruba Helen
Anthony, A Noreen
Sahayaraj, J Wilson
Amalraj, A John
Rajendran, Susai
Keywords: Carbon steel
corrosion inhibition
adipic acid
well water
zinc ion
Issue Date: Jul-2005
Publisher: CSIR
Series/Report no.: C23F11/00
Abstract: The inhibition efficiency (IE) of adipic acid (AA)-Zn<sup>2+</sup> system in controlling corrosion of carbon steel immersed in well water has been evaluated by weight-loss method. The formulation consisting of 50 ppm of AA and 50 ppm of Zn<sup>2+</sup> has 95% IE. At lower pH value(pH=6) IE decreases and in alkaline medium (pH=8) IE increases. Polarization study reveals that AA- Zn<sup>2+</sup> system functions as a mixed inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe<sup>2+</sup>-AA complex and Zn(OH)<sub>2</sub>.
Description: 472-476
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.12(4) [July 2005]

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