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Inhibitive effect of polyacrylamide grafted with fenugreek mucilage on corrosion of mild steel in 0.5 M H 2 SO 4 at 35°C
Author(s) -
Srivastava Varsha,
Banerjee Sitashree,
Singh M. M.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31559
Subject(s) - polyacrylamide , corrosion , adsorption , dielectric spectroscopy , mucilage , electrochemistry , langmuir adsorption model , materials science , polarization (electrochemistry) , cathodic protection , corrosion inhibitor , nuclear chemistry , electrode , polysaccharide , chemical engineering , chemistry , analytical chemistry (journal) , metallurgy , polymer chemistry , chromatography , organic chemistry , botany , engineering , biology
The inhibitive effect of polyacrylamide grafted with fenugreek mucilage, a natural grade polysaccharide, on the corrosion of mild steel in 0.5 M H 2 SO 4 has been investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy. An inhibition efficiency of 78% has been obtained at a concentration as low as 1 ppm and efficiency as high as 96% at 100 ppm. The polarization studies reveal that it acts as a predominantly cathodic inhibitor. The adsorption of this inhibitor on the mild steel surface obeys a Langmuir adsorption isotherm. The deposited films on the electrode surface have been analyzed by using microscopic techniques. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010