Synergistic Effect of Thiourea-Zn2+ and L-Phenylalanine on the Inhibition of Corrosion of Mild Steel in Acid Medium | Zendy

Muniandy Geetha | Zendy; J. Sathish | Zendy; S. Rajendran | Zendy

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Synergistic Effect of Thiourea-Zn2+ and L-Phenylalanine on the Inhibition of Corrosion of Mild Steel in Acid Medium

Author(s) -

Muniandy Geetha,

J. Sathish,

S. 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 , corrosion , metal , nuclear chemistry , corrosion inhibitor , fourier transform infrared spectroscopy , 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.

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