Kinetic and morphological study of sulphidation of monocrystalline nickel oxide

Abstract The sulphidation of monocrystals of nickel oxide by hydrogen sulphide leads to the formation of a compact protective layer of nickel monosulphide. The rate of sulphidation is fixed by the diffusion of oxygen and nickel ions in the sulphide layer. As in metal corrosion a honeycombed zone is formed at the internal interface by ionic diffusion towards the external interface.