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A new theory for the negative difference effect in magnesium corrosion / S. Bender in Materials and corrosion, Vol. 63 N° 8 (Août 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 707–712 Titre : A new theory for the negative difference effect in magnesium corrosion Type de document : texte imprimé Auteurs : S. Bender, Auteur ; J. Goellner, Auteur ; A. Heyn, Auteur Année de publication : 2013 Article en page(s) : pp. 707–712 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Current  density-potential-curve;  magnesium  alloys;  magnesium  corrosion;  negative  difference  effect;  polarization  measurements Résumé : An unusual feature known as the negative difference effect (NDE) can be observed in magnesium when recording corrosion current density–potential curves. More hydrogen is evolved at a more positive potential which does not occur in conventional metals. Several models have been proposed in the literature in order to explain the phenomenon of NDE. They succeed in explaining some effects, and fail to deal with others. A new model, which explains the NDE by two electron consuming processes, is presented in this paper. By potentiostatic investigations of magnesium in a chloride electrolyte, measurements of hydrogen evolution and chemical analysis of the electrolyte the new model was experimentally verified. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106225/abstract [article] A new theory for the negative difference effect in magnesium corrosion [texte imprimé] / S. Bender, Auteur ; J. Goellner, Auteur ; A. Heyn, Auteur . - 2013 . - pp. 707–712. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 707–712 Mots-clés : Current  density-potential-curve;  magnesium  alloys;  magnesium  corrosion;  negative  difference  effect;  polarization  measurements Résumé : An unusual feature known as the negative difference effect (NDE) can be observed in magnesium when recording corrosion current density–potential curves. More hydrogen is evolved at a more positive potential which does not occur in conventional metals. Several models have been proposed in the literature in order to explain the phenomenon of NDE. They succeed in explaining some effects, and fail to deal with others. A new model, which explains the NDE by two electron consuming processes, is presented in this paper. By potentiostatic investigations of magnesium in a chloride electrolyte, measurements of hydrogen evolution and chemical analysis of the electrolyte the new model was experimentally verified. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106225/abstract