Open AccessCorrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn2+System
Author(s) -
S. Gowri,
J. Sathiyabama,
S. Rajendran
Publication year - 2014
Publication title -
international journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.309
H-Index - 25
eISSN - 1687-8078
pISSN - 1687-806X
DOI - 10.1155/2014/607209
Subject(s) - corrosion , metal , carbon steel , arginine , oxide , polarization (electrochemistry) , cyclic voltammetry , materials science , dielectric spectroscopy , electrochemistry , anode , chemistry , nuclear chemistry , metallurgy , inorganic chemistry , electrode , biochemistry , amino acid
The inhibition efficiency of L-Arginine-Zn2+ system in controlling corrosion of carbon steel in sea water has been evaluated by the weight-loss method. The formulation consisting of 250 ppm of L-Arginine and 25 ppm of Zn2+ has 91% IE. A synergistic effect exists between L-Arginine and Zn2+. Polarization study reveals that the L-Arginine-Zn2+ system functions as an anodic inhibitor and the formulation controls the anodic reaction predominantly. AC impedance spectra reveal that protective film is formed on the metal surface. Cyclic voltammetry study reveals that the protective film is more compact and stable even in a 3.5% NaCl environment. The nature of the protective film on a metal surface has been analyzed by FTIR, SEM, and AFM analysis
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