Abstract
The Na 2SO 4-induced corrosion kinetics of pure iron between 600 and 800°C was studied using a SO 3-SO 2-O 2 mixed atmosphere. At any temperature accelerated oxidation of the metal was observed: this phenomenon is attributed to the formation of a liquid sulphate phase from the initially solid Na 2SO 4 deposit. A corrosion mechanism based on the dissolution of iron and iron oxides on the scale surface is proposed. The attack occurs through different stages: first a liquid FeSO 4-Na 2SO 4 phase is probably formed from the initially pure solid Na 2SO 4 layer; then accelerated oxidation goes on by SO 3 inward diffusion and iron outward diffusion through the molten salt. Transport models and quantitative estimates of the fluxes of the reacting species are presented.
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