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Investigation of Corrosion Inhibition Behavior of C38 Steel in Hydrochloric Acid Solution ‎by 2-Hydroxy-1-(2-Hydroxy-4-Sulfo-1-Naphthylazo)-3-Naphthoic Acid

Thu, 2015-01-29 09:49 — Shehdeh Jodeh
Journal Title, Volume, Page: 
Transactions of the Indian Institute of Metals
Year of Publication: 
2014
Link: 
http://link.springer.com/article/10.1007/s12666-014-0479-3
Authors: 
Shehdeh Jodeh
Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
[email protected]
Belkheir Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier, BP 4808, Oujda, Morocco
Salem Selim Al-Deyab
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
Omar Benali
Department of Biology, Faculty of Sciences, Saïda University, Saïda, Algeria
Rachid Salghi
Equipe de Génie de l’Environnement et de Biotechnologie, ENSA, Université Ibn Zohr, BP 1136, Agadir, Morocco
Laila Afia
Equipe de Génie de l’Environnement et de Biotechnologie, ENSA, Université Ibn Zohr, BP 1136, Agadir, Morocco
Preferred Abstract (Original): 

The corrosion inhibition properties of 2-hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic acid (HHSNNA) for C38 steel in HCl 1 M solution were analyzed by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and gravimetric methods. It was found that the presence of HHSNNA hugely decreases the corrosion rate, while its inhibition efficiency (E%) increases with concentration to attain 93.8 % at 10−3 M. The high inhibitory efficiency of HHSNNA was related with the adsorption of HHSNNA molecules at the metal/solution interface and a protective film formation. Adsorption behavior of the inhibitor on the surface followed the Langmuir adsorption isotherm. This compound is classified as the mixed type corrosion inhibitor with predominant control of the cathodic reaction. Data, obtained from EIS measurements, were analyzed to model the corrosion inhibition process through an appropriate equivalent circuit model.

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