Documents disponibles écrits par cet auteur

Metallurgical and environmental factors affecting the pitting behavior of UNS S 32205 duplex stainless steel in chloride solutions / H. M. Ezuber in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 111–118 Titre : Metallurgical and environmental factors affecting the pitting behavior of UNS S 32205 duplex stainless steel in chloride solutions Type de document : texte imprimé Auteurs : H. M. Ezuber, Auteur Année de publication : 2012 Article en page(s) : pp. 111–118 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : CO2;  fluid  flow;  pitting  corrosion;  sigma  phase;  UNS  S  32205  stainless  steel Résumé : The effect of temperatures up to 80 °C, dissolved CO2 (sat.), and flow (agitation) up to 1000 rpm on the breakdown potential of mill-annealed UNS S 32205 duplex stainless steel (DSS) has been evaluated in 1 M NaCl solution using potentiodynamic polarization technique. The results were compared with heat-treated samples (furnace heated at 850 °C for 10 or 60 min followed by water quench). The aim of the heat treatment is to simulate sigma phase precipitation. The results show dependence of pitting potential on the various factors (sigma phase, test temperature, dissolved CO2 (sat.), or solution flow) being studied. In general, the mill annealed or heat-treated UNS S 32205 DSS alloys are immune to pitting at room temperature (23 °C). At 50 °C however, pitting corrosion is evident and the intensity of such attack is increased with the presence of dissolved CO2, increasing isotherm held duration and/or seawater temperature. In contrast, agitation speed of 350 rpm (Re of 12 880) or above (sufficiently to yield turbulent flow) has shifted the pitting potential to more positive values. Lower speed of 100 rpm, however, is negligibly different from the stagnant conditions. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005667/abstract [article] Metallurgical and environmental factors affecting the pitting behavior of UNS S 32205 duplex stainless steel in chloride solutions [texte imprimé] / H. M. Ezuber, Auteur . - 2012 . - pp. 111–118. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 111–118 Mots-clés : CO2;  fluid  flow;  pitting  corrosion;  sigma  phase;  UNS  S  32205  stainless  steel Résumé : The effect of temperatures up to 80 °C, dissolved CO2 (sat.), and flow (agitation) up to 1000 rpm on the breakdown potential of mill-annealed UNS S 32205 duplex stainless steel (DSS) has been evaluated in 1 M NaCl solution using potentiodynamic polarization technique. The results were compared with heat-treated samples (furnace heated at 850 °C for 10 or 60 min followed by water quench). The aim of the heat treatment is to simulate sigma phase precipitation. The results show dependence of pitting potential on the various factors (sigma phase, test temperature, dissolved CO2 (sat.), or solution flow) being studied. In general, the mill annealed or heat-treated UNS S 32205 DSS alloys are immune to pitting at room temperature (23 °C). At 50 °C however, pitting corrosion is evident and the intensity of such attack is increased with the presence of dissolved CO2, increasing isotherm held duration and/or seawater temperature. In contrast, agitation speed of 350 rpm (Re of 12 880) or above (sufficiently to yield turbulent flow) has shifted the pitting potential to more positive values. Lower speed of 100 rpm, however, is negligibly different from the stagnant conditions. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005667/abstract