日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 77, No. 6 (2013),
pp. 210-217

Correlation between Non-Dissociative Adsorption of CO and Surface Segregation of Solute Elements in Ni Alloys (Metal Dusting Corrosion)

Yoshitaka Nishiyama, Takashi Doi and Koji Moriguchi

Corporation Technical R&D Bureau, Steel Research Laboratories, Nippon Steel & Sumitomo Metal Corporation, Amagasaki 660-0891

Abstract:

We present a joint experimental and theoretical study on metal dusting phenomena in Ni binary alloys containing group-14 and 15 elements in the periodic series. Laboratory metal dusting test of several Ni binary alloys was conducted in a simulated syngas atmosphere consisting of CO, H2, CO2, and H2O at 923 K for 100 h. The Ni alloys containing the group-14 and 15 elements exhibited excellent metal dusting resistance. This behavior is reasonably interpreted by the Blyholder mechanism and the electron filling concept in the p-d hybridization states for the associated alloys. Furthermore, surface segregation of the group-14 and 15 elements was analyzed by ARXPS on the Ni alloys after exposing at 923 K in a vacuum. The behavior of those segregation was quantitatively associated with the non-dissociative adsorption. [doi:10.2320/jinstmet.JB201210]


(Received 2012/11/20)

Keywords:

metal dusting, carbon monoxide, dissociative adsorption, electronic structure, surface segregation


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