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The rate of chlorination of metals and oxides: Part I. Fe, Ni, and Sn in chlorine

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Abstract

The rates of chlorination of Fe (528 to 921 K), Ni (890 to 1249 K), and Sn (340 to 396 K) in Cl2-He andCl2-Ar mixtures were measured. In the temperature range of the respective investigations the overall reaction products are gaseous: (FeCl3)2, NiCl2, and SnCl4. Transport through the gas film boundary layer at the surface of the sample plays a major role in controlling the rate of the reactions over large temperature ranges for all three metals. In the high-temperature range for iron (> 680 K) and nickel (> 993 K) as well as for the entire temperature range studied for tin, the transport of Cl22(g) through the gas film boundary layer to the surface of the sample controlled the rates for the experimental conditions in the present work. The transport of NiCl2(g) controlled the rate of the Ni-Cl2 reaction at lower temperatures. The rate of the Fe-Cl2 reaction at lower temperatures is controlled by a slow surface reaction between Cl2(g) and FeCl2(s) which covers the surface of the iron. The overall activation energy for the formation of the activated complex (FeCl3)2‡ is 23 kcal/g-atom Fe.

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  1. United States Steel Research Center, Monroeville, Pa.

    R. J. Fruehan (Senior Scientist)

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  1. R. J. Fruehan
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Fruehan, R.J. The rate of chlorination of metals and oxides: Part I. Fe, Ni, and Sn in chlorine. Metall Trans 3, 2585–2592 (1972). https://doi.org/10.1007/BF02644233

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