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Paper Details

Corrosion inhibition by Allium sativum (garlic) extract

K. Rajam1*, S. Rajendran2, 3, M. Manivannan4 and R. Saranya5

Journal Title:Journal of Chemical, Biological and physical sciences

The inhibition efficiency (IE) of an aqueous extract of garlic (GE) in controlling corrosion of carbon steel in well water in the absence and presence of Zn2+ has been evaluated by mass loss method. The formulation consisting of 2 mL GE and 25 ppm Zn2+ offers 65% IE to carbon steel immersed in well water. Addition of malic acid (MA) increases IE of the GE Zn2+ system. The IE of GE-Zn2+ and GEZn2+- MA system decreases with increase in immersion period (IP) and it increases with increase in pH from 3 to 11. Polarization study reveals that this formulation controls the anodic reaction predominantly. FTIR spectra reveal that the protective film consists of Fe2+- allicin complex and Zn (OH)2. The nature of the protective film formed on the metal surface has been characterized by Scanning Electron Microscopy (SEM).