The effect of sodium sulphate on the corrosion of manganese at 600–800°C

The effect of Na 2SO 4 on the oxidation of pure Mn has been studied under a mixed oxygen-SO 2 atmosphere in the temperature range 600–800°C. The presence of the salt, in spite of the large scattering of the kinetic data, shows a remarkable increasing effect on the metal oxidation rate at 700 and 800...

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Bibliographic Details
Published in:Corrosion science 1991, Vol.32 (4), p.399-415
Main Authors: Buscaglia, V., Nanni, P., Battilana, G.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Exact sciences and technology
Metals. Metallurgy
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Summary:The effect of Na 2SO 4 on the oxidation of pure Mn has been studied under a mixed oxygen-SO 2 atmosphere in the temperature range 600–800°C. The presence of the salt, in spite of the large scattering of the kinetic data, shows a remarkable increasing effect on the metal oxidation rate at 700 and 800°C, whereas at 600°C no accelerated oxidation has been observed. A thermodynamic description of the Mn-O-S system and of the interactions between the oxides scale and the sodium sulphate deposit is presented. The calculations indicate that the formation of a molten MnSO 4-Na 2SO 4 mixture is likely to occur at 700 and 800°C, supporting a low temperature hot corrosion (LTHC) mechanism for the accelerated corrosion.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(91)90122-6