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Evaluation of corrosion non toxic inhibitor adsorption for steel in near neutral solution: L(+) ascorbic acid
Author(s) -
Akrout H.,
Maximovitch S.,
Bousselmi L.,
Triki E.,
Dalard F.
Publication year - 2007
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.200603998
Subject(s) - adsorption , ascorbic acid , quartz crystal microbalance , dielectric spectroscopy , corrosion , electrochemistry , cathodic protection , langmuir , chemistry , corrosion inhibitor , inorganic chemistry , freundlich equation , electrode , organic chemistry , food science
The force of adsorption of a non‐toxic inhibitor on iron surface was studied by electrochemical quartz crystal microbalance (EQCM). The value of standard free energy of adsorption, as calculated from Freundlich‐Langmuir (LF) adsorption, indicates that L(+)ascorbic acid physisorbes on the iron surface at corrosion potential. At cathodic potential, the quantity of energy is more important. So, there is a slightly stronger interaction between inhibitor and iron surface. This behaviour can be explained by that this inhibitor occupies better the cathodic sites. The inhibition efficiency of ascorbic acid was carried out by the fact electrochemical impedance spectroscopy data (EIS). The film adsorbed on the surface is less protective for a long time of immersion.