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Environmentally Friendly Nonionic Surfactants Derived from Jatropha Oil Fatty Acids as Inhibitors for Carbon Steel Corrosion in Acidic Medium
Author(s) -
Negm Nabel A.,
Badr Emad A.,
Zakaria Khaled,
ElRaouf Mohamed Abd
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-015-1739-x
Subject(s) - chemistry , dielectric spectroscopy , environmentally friendly , corrosion , corrosion inhibitor , carbon steel , biodegradation , organic chemistry , nuclear chemistry , electrochemistry , ecology , electrode , biology
The inhibition effect of four novel environmentally friendly inhibitors (derived from vanillin and a fatty acid mixture obtained from the hydrolysis of Jatropha oil) on carbon steel corrosion in 0.5 M H 2 SO 4 was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results show high efficiency of the inhibitors. The inhibition efficiency increases by increasing the polyethylene glycol chain length and the inhibitor concentration. From polarization curves, the inhibitors act as cathodic inhibitors. EIS spectra display a large capacitive loop at high frequencies followed by a large inductive loop at low frequencies. Environmental study shows inhibitors tendency towards biodegradation by the action of microorganisms after 28 days.