【摘要】 采用金相显微镜、X射线衍射、X射线荧光探针、场发射扫描电子显微镜-能谱分析和孔径测试等微观分析手段,对某燃煤电站锅炉水冷壁的腐蚀产物进行了系统分析,结果表明腐蚀产物呈层状结构,其外层疏松多孔,内层结构致密;腐蚀产物主要组成为铁硫化物,铁氧化物和少量的硅酸盐组分,由内而外腐蚀产物的元素分布规律为硅、铝含量呈上升趋势,硫、铁含量呈下降趋势;矿物组成主要为腐蚀生成的铁硫化物矿物、铁氧化物矿物以及来自飞灰颗粒的硅铝酸盐矿物。综合分析其组成和微区特征,其水冷壁的腐蚀类型为硫化物型腐蚀。更多还原

【Abstract】 By adopting a variety of microscopic analytic methods, such as metallographic microscope and X-ray diffraction analysis, X-ray fluorescent probe analysis, electronic microscope-energy spectrum analysis by field emission scanning and aperture testing etc., a systematic analysis was conducted for the corrosion products of the water wall of a coal-fired utility boiler. The results of the analysis show that the corrosion products assume a laminar structure with its outer layer being loose and porous and its inner layer rather compact. The corrosion products mainly consist of iron sulfide, iron oxide and a small quantity of silicate. The element distribution regularity of the corrosion products from inside to outside can be given as follows: the content of silicon and aluminium assumes an ascending tendency and that of sulfur and iron a descending tendency. The mineral matter mainly includes iron sulfide and iron oxide generated by corrosion as well as silicon aluminate which originated from fly-ash particles. A comprehensive analysis of the composition and microscopic characteristics shows that the corrosion of the water wall pertains to one of sulfide type.更多还原