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Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization / M. Kouril in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 310–316 Titre : Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization Type de document : texte imprimé Auteurs : M. Kouril, Auteur ; E. Christensen, Auteur ; S. Eriksen, Auteur Année de publication : 2012 Article en page(s) : pp. 310–316 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Anodic  polarization;  mass  loss;  niobium;  phosphoric  acid;  silicon  carbide;  stainless  steel;  tantalum  coating;  titanium;  water  electrolyser Résumé : The paper is focused on selection of a proper material for construction elements of water electrolysers, which make use of a 85% phosphoric acid as an electrolyte at temperature of 150 °C and which might be loaded with anodic polarization up to 2.5 V versus a saturated Ag/AgCl electrode (SSCE). Several grades of stainless steels were tested as well as tantalum, niobium, titanium, nickel alloys and silicon carbide. The corrosion rate was evaluated by means of mass loss at free corrosion potential as well as under various levels of polarization. The only corrosion resistant material in 85% phosphoric acid at 150 °C and at polarization of 2.5 V/SSCE is tantalum. In that case, even a gentle cathodic polarization is harmful in such an acidic environment. Hydrogen reduction leads to tantalum hydride formation, to loss of mechanical properties and to complete disintegration of the metal. Contrary to tantalum, titanium is free of any corrosion resistance in hot phosphoric acid. Its corrosion rate ranges from tens of millimetres to metres per year depending on temperature of the acid. Alloy bonded tantalum coating was recognized as an effective corrosion protection for both titanium and stainless steel. Its serviceability might be limited by slow dissolution of tantalum that is in order of units of mm/year. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006021/abstract [article] Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization [texte imprimé] / M. Kouril, Auteur ; E. Christensen, Auteur ; S. Eriksen, Auteur . - 2012 . - pp. 310–316. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 310–316 Mots-clés : Anodic  polarization;  mass  loss;  niobium;  phosphoric  acid;  silicon  carbide;  stainless  steel;  tantalum  coating;  titanium;  water  electrolyser Résumé : The paper is focused on selection of a proper material for construction elements of water electrolysers, which make use of a 85% phosphoric acid as an electrolyte at temperature of 150 °C and which might be loaded with anodic polarization up to 2.5 V versus a saturated Ag/AgCl electrode (SSCE). Several grades of stainless steels were tested as well as tantalum, niobium, titanium, nickel alloys and silicon carbide. The corrosion rate was evaluated by means of mass loss at free corrosion potential as well as under various levels of polarization. The only corrosion resistant material in 85% phosphoric acid at 150 °C and at polarization of 2.5 V/SSCE is tantalum. In that case, even a gentle cathodic polarization is harmful in such an acidic environment. Hydrogen reduction leads to tantalum hydride formation, to loss of mechanical properties and to complete disintegration of the metal. Contrary to tantalum, titanium is free of any corrosion resistance in hot phosphoric acid. Its corrosion rate ranges from tens of millimetres to metres per year depending on temperature of the acid. Alloy bonded tantalum coating was recognized as an effective corrosion protection for both titanium and stainless steel. Its serviceability might be limited by slow dissolution of tantalum that is in order of units of mm/year. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006021/abstract