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53 (2000), p. 361 [7] Li Meishuan: High Temperature Corrosion of Metals (Metallurgical Industry Press, Beijing 2001). In chinese. [8] Kuo-Chih Chou, Kuangdi Xu: Intermetallics Vol. 15 (2007), p. 767 [9] Q. H. B. Pan et al: Int. J Hydrogen Energy Vol. 35 (2010), p. 7842 [10] Kuo-Chih Chou: J Am. Ceram. Soc. Vol. 89 (2006), p. 1568 [11] Li Tiefan: High Temperature Oxidation and Hot Corrosion of Metals (Chemical Industry Press, Beijing 2003). In Chinese. [12] Neil Birks, Gerald H. Meier, Fred S. Pettit: Introduction to the High-Temperature Oxidation of Metals (Cambridge University Press, New York 2006).

Additional, considering the influence of oxygen on cobalt redissolution as well as existing reactions in solution as following: Co(s)-2e→Co2+ O2+2H2O+4e→4OHCo2++2OH-→Co(OH)2 The total reaction of cobalt redissolution should be: 2Co(s)+O2+2H2O→2Co(OH)2 Where Co(s) is simple substance Co or solid solution. The cobalt cementation by zinc dust is not a single reaction, and is not a first order reaction, which includes at least the following two reactions: forming cobalt alloy; forming basic cobalt salt on the surface of zinc dust.

Experiment Materials and preparation of the slags. The materials used in the present work include reagent grade MgO, Al2O3, SiO2, CaO, Cu2O, Fe3O4, Fe2O3 and iron. While the Fe, Fe3O4 and Fe2O3 powder were dried at 393 K overnight, the CaO, MgO and SiO2 powder was calcined at 1273 K for 12 hours in a muffle furnace to decompose any carbonate or hydroxide before use. In order to prepare the slag, FeO was prepared by mixing stoichiometric Fe2O3 and pure iron powder and sintering in an iron crucible under Ar gas protection at 1573 K for about 8 hours.

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