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High temperature corrosion during biomass firing: improved understanding by depth resolved characterisation of corrosion products

机译：生物质燃烧过程中的高温腐蚀：通过深度解析腐蚀产物的特征来提高对腐蚀的理解

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摘要

The high temperature corrosion of an austenitic stainless steel (TP 347H FG), widely utilised as a superheater tube material in Danish power stations, was investigated to verify the corrosion mechanisms related to biomass firing. KCl coated samples were exposed isothermally to 560 degrees C, for one week, under conditions simulating straw-firing. Thorough characterisation of the exposed samples was conducted by the analysis of sample cross-sections applying microscopy and spectroscopy based techniques. Cross-section analysis revealed the microstructure, as well as chemical and morphological changes within the near surface region (covering both the deposit and the steel surface). Such cross-section analysis was further complemented by plan view investigations (additionally involving X-ray diffraction) combined with removal of the corrosion products. Improved insights into the nature of the corrosion products as a function of distance from the deposit surface were revealed through this comprehensive characterisation. Corrosion attack during simulated straw-firing conditions was observed to occur through both active oxidation and sulphidation mechanisms.
机译：对奥氏体不锈钢（TP 347H FG）的高温腐蚀进行了研究，以验证其与生物质燃烧有关的腐蚀机理，该材料在丹麦电站中被广泛用作过热器管材。在模拟秸秆焚烧的条件下，将KCl涂层的样品等温暴露于560摄氏度下一周。通过使用显微镜和光谱技术对样品横截面进行分析，对暴露样品进行了彻底的表征。横截面分析揭示了近表面区域（覆盖沉积物和钢表面）内的微观结构以及化学和形态变化。结合平面图研究（还涉及X射线衍射）和去除腐蚀产物，进一步补充了这种横截面分析。通过这种全面的表征，揭示了对腐蚀产物的性质（与距沉积表面的距离的函数关系）的深入了解。观察到在模拟秸秆焚烧条件下的腐蚀是通过主动氧化和硫化机制发生的。

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