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- W2092034387 abstract "Thermal analysis has been used to determine the melting behaviour of alkali metal sulphate deposits typical of those found on superheater tubes in coal-fired power station boilers. Additions of 5–30 m/o Fe2(SO4)2 to Na2SO4K2SO4 mixtures under a simulated flue gas (N2 + 15 v/o CO2 + 1 v/o O2 + 0.3 v/o SO2) are shown to reduce the melting point from 820°C to below 550°C. Alkali-iron trisulphates are formed which re-solidify on heating above 720°C by decomposition of Fe2(SO4)3 at low thermodynamic activity. It is suggested that the effect of heat flux and SO3 potential gradient on the melting behaviour of a superheater deposit could account for the observed ‘bell-shaped’ temperature dependence of corrosion rate in the range 550–750°C. Results are presented of laboratory corrosion tests on three commercial austenitic stainless steels using a melt of composition 74 m/o Na2SO4 + 20 m/o K2SO4 + 6 m/o Fe2 (SO4)3. A model is proposed for corrosion by an acid fluxing mechanism involving refractory metal alloy elements in the steels. The model offers a quantitative basis for prediction of fireside corrosion resistance in coal-fired boilers, and a comparison of relative corrosion rates of a range of steels in laboratory tests, probe trials and service performance confirms the validity of the present model." @default.
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- W2092034387 date "1980-01-01" @default.
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- W2092034387 title "Corrosion of austenitic steels in molten sulphate deposits" @default.
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- W2092034387 doi "https://doi.org/10.1016/0010-938x(80)90007-4" @default.
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