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Inhibition mechanism of nitrite on the corrosion of carbon steel in simulated cooling water systems
Author(s) -
Khani Hosein,
Arefinia Reza
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709735
Subject(s) - physisorption , nitrite , corrosion , carbon steel , adsorption , dielectric spectroscopy , sodium nitrite , langmuir adsorption model , chemistry , chloride , inorganic chemistry , polarization (electrochemistry) , electrochemistry , materials science , nitrate , electrode , organic chemistry
The corrosion inhibition mechanism of sodium nitrite on carbon steel has been carefully studied in different simulated cooling water solutions by using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The obtained results showed that the corrosion inhibition increases by increasing the nitrite concentration up to 9 mM in 5 mM chloride solution at 25 °C. The corrosion state and corrosion current density are strongly depended upon the nitrite and chloride concentration, solution temperature, and applied potential. The interaction of nitrite with metal surface follows the Langmuir adsorption isotherm and the adsorption is as a physisorption process in a neutral solution.