Open AccessSynergistic Effect of Thiourea-Zn2+ and L-Phenylalanine on the Inhibition of Corrosion of Mild Steel in Acid Medium
Author(s) -
Muniandy Geetha,
J. Sathish,
Susai Rajendran
Publication year - 2019
Publication title -
science and technology journal
Language(s) - English
Resource type - Journals
ISSN - 2321-3388
DOI - 10.22232/stj.2019.07.02.09
Subject(s) - thiourea , phenylalanine , chemistry , metal , corrosion , nuclear chemistry , fourier transform infrared spectroscopy , corrosion inhibitor , inorganic chemistry , polarization (electrochemistry) , amino acid , organic chemistry , chemical engineering , biochemistry , engineering
The formulation consisting of 100 ppm Thiourea, 25 ppm Zn2+ and 250 ppm of L-Phenylalanine has 95% corrosion inhibition efficiency with a synergistic effect among Thiourea, L-Phenylalanine and Zn2+ ions. Polarization study shows that this formulation as a mixed inhibitor. FTIR spectra exposed the presence of Fe2+-Thiourea, Fe2+-L-Phenylalanine complex and Zn(OH)2 in protective film. AFM study confirmed the metal surface smoothness following engrossed in the inhibitor and the presence of formed protective film on the metal surface.