Abstract
Synthesis of pure heazlewoodite (Ni 3S 2) was carried out under vaccum, employing a stoichiometric mixture of nickel and sulphur, involving vapour-solid reactions. Massive or compact electrodes were obtained from synthesized powder fused at 850 °C. The influence of suspension density, particle size of powder, residual stresses and applied potential, on dissolution rates of Ni 3S 2 in 1 N FeCl 3 was studied. The nickel sulphide dissolution rate was increased by an increase in suspension density, a decrease in particle size and a rise in applied potential. Flattening of the dissolution-time curves is characteristic of reactions controlled by the diffusion rate. Correlations were made between the corrosion current from potentiokinetic measurements, the potential variation as a function of time, the ferric/ferrous oxidation-reduction equilibria and the dissolution characteristics of Ni 3S 2.
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