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CORROSION RESISTANCE EVALUATION OF DUPLEX STAINLESS STEEL 2205 INACIDIC AND CHLORIDE ENVIRONMENT

Auteurs : ZIOUCHE Aicha, ZERGOUG Mourad, DEHCHAR Cherif, MOKHTARI Madjda, YOUNES Abdrahmane
Année : 2014
Domaine : Electrotechnique
Type : Communication
Conférence: 9ème Congrès Francophone de Génie des Procédés
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : duplex stainless steel, Pitting corrosion, PREN, Electrochemical impedance spectroscopy

Résumé :

This work is mainly devoted to the study ofelectrochemical performance anticorrosive of stainless steel,2205 duplex by immersion in different study at roomtemperature and different concentrations of corrosive speciesenvironments. The chemical composition and morphologicalstructure of the stainless steel material, respectively, arecharacterized by X-ray fluorescence and by optical microscopy.Electrochemical tests are performed in three electrolytes,namely sodium chloride (NaCl) at 3 %, hydrochloric acid (HCl)3% and hydrochloric acid (HCl) 5%. The techniques used inthis study are potentiometric open circuit (OCP), linearpolarization (LP) and electrochemical impedance spectroscopy(EIS). The impedance spectra and the current - potential curvesobtained allowed the estimation of the rate of corrosion indifferent electrolytes and showed a change of the polarizationresistance (Rp) and the degradation kinetics of this materialdepending on the composition of the study areas.