The Effect of Sodium Sulphate on the Corrosion of Manganese at 600-800 deg C

The effect of Na sub 2 SO sub 4 on the oxidation of pure Mn has been studied under a mixed oxygen--SO sub 2 atmosphere in the temperature range 600-800 deg 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 r...

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Bibliographic Details
Published in:Corrosion science 1991-04, Vol.32 (4), p.399-415
Main Authors: Buscaglia, V, Nanni, P, Battilana, G
Format: Article
Language:English
Online Access:Get full text
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Summary:The effect of Na sub 2 SO sub 4 on the oxidation of pure Mn has been studied under a mixed oxygen--SO sub 2 atmosphere in the temperature range 600-800 deg 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 deg C, whereas at 600 deg 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 sub 4 --Na sub 2 SO sub 4 mixture is likely to occur at 700 and 800 deg C, supporting a low temperature hot corrosion (LTHC) mechanism for the accelerated corrosion. Graphs, Phase diagrams. 22 ref.--AA
ISSN:0010-938X