The rate of chlorination of metals and oxide: part II. iron and nickel in HCL(g)

Abstract

The rates of chlorination of iron (810 to 1175 K) and nickel (850 to 1340 K) in HC1 (g) have been measured. For all conditions in this work the rates are controlled by transport through the gas film boundary layer at the surface of the sample. At low temperatures and high pressures of HC1 the condensed chlorides form, FeCl₂ (s or l) and NiCl₂(s), and the steady state weight loss is controlled by diffusion of metal chlorides through the gasfilm boundary layer; the temperature dependence of the rates is essentially the same as for the vapor pressure of the chlorides: 37 kcal for iron and 53 kcal for nickel. At high temperatures the condensed chlorides do not form and the rates are controlled by the countercurrent diffusion of HC1 and the gaseous chlorides through the boundary layer for both metals.