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LIU Sue, ZHU Ziyong \=(State Key Laboratory for Corrosion and Protection Institute of Corrosion and Protection of Metals,\=The Chinese Academy of Sciences, Shenyang 110015) \= \=  
The local corrosion of the fire side of waterwall tubes in a coal\|fired boiler of a power plant was analysed. The results of electronic probe microanalysis, energy dispersion spectrometer and X\|ray diffraction analysis showed that the fire side of waterwall tubes was covered by corrosion products of iron oxide and iron sulfide and sulfur element content was over 20%(wt.) in maximum. The fire\|side corrosion was mainly caused by sulfur corrosion at high temperatures when incompleted fuel combusion occurred.\=
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