A comparison of the electrochemical behaviors of pyrite and chalcopyrite in a NaCl solution at room temperature and under differential stress / Qingyou Liu in Minerals engineering, Vol. 23 N° 9 (Août 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 691–697 Titre : A comparison of the electrochemical behaviors of pyrite and chalcopyrite in a NaCl solution at room temperature and under differential stress Type de document : texte imprimé Auteurs : Qingyou Liu, Auteur ; Heping Li, Auteur Année de publication : 2011 Article en page(s) : pp. 691–697 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Pyrite Chalcopyrite Polarization curve Electrical impedance spectroscopy Differential stress Résumé : Electrochemical behaviors of pyrite and chalcopyrite were studied by measuring polarization curves and electrochemical impedance spectroscopy (EIS) in a NaCl solution at room temperature and under differential stress. The results from differential stress experiments show that there is a negative linear relation between potential difference and elastic stress. The corrosion current density distinctly increased, and the corrosion potential became more negative with an increase in differential stress. The charge transfer electrical resistance increased, the double layer capacitance decreased, and other characteristic parameters are observed with increasing differential stress. The experimental results are significant for sulfide mineral engineering. By using different equivalent electrical circuits, the point defect model, and corrosion theory, we explain the experimental results theoretically. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001135 [article] A comparison of the electrochemical behaviors of pyrite and chalcopyrite in a NaCl solution at room temperature and under differential stress [texte imprimé] / Qingyou Liu, Auteur ; Heping Li, Auteur . - 2011 . - pp. 691–697. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 691–697 Mots-clés : Pyrite Chalcopyrite Polarization curve Electrical impedance spectroscopy Differential stress Résumé : Electrochemical behaviors of pyrite and chalcopyrite were studied by measuring polarization curves and electrochemical impedance spectroscopy (EIS) in a NaCl solution at room temperature and under differential stress. The results from differential stress experiments show that there is a negative linear relation between potential difference and elastic stress. The corrosion current density distinctly increased, and the corrosion potential became more negative with an increase in differential stress. The charge transfer electrical resistance increased, the double layer capacitance decreased, and other characteristic parameters are observed with increasing differential stress. The experimental results are significant for sulfide mineral engineering. By using different equivalent electrical circuits, the point defect model, and corrosion theory, we explain the experimental results theoretically. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001135

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