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为了保证超临界锅炉的安全稳定运行,降低检修成本和材料损失,本文借助于SEM、EDS、XRD等手段对超临界锅炉末级过热器管外壁腐蚀膜形貌、元素构成、物相构成等进行了分析和研究。实验结果表明:超临界锅炉末级过热器管外壁腐蚀膜较为连续,且与基体结合紧密,其较厚区约540μm,为多层结构,由基体至腐蚀层依次为Cr5S6/Fe S/Cr O2复合层、Fe3O4/Cr O2复合层、Fe2O3层。同时腐蚀层表面存在剥落现象,且腐蚀层内部也有裂纹存在。
In order to ensure the safe and stable operation of the supercritical boiler and reduce the maintenance cost and material loss, the corrosion film morphology, elemental composition, phase composition and so on of the outer wall of superheater tube of the supercritical boiler were studied by means of SEM, EDS and XRD Analysis and research. The experimental results show that the corrosion film on the outer wall of the superheater tube of the supercritical boiler is continuous and tightly bonded with the substrate. The thicker film is about 540μm in thickness and has a multi-layer structure. The corrosion film from the substrate to the corrosion layer is Cr5S6 / Fe S / Cr O2 Composite layer, Fe3O4 / Cr O2 composite layer, Fe2O3 layer. At the same time, there is flaking on the surface of the corrosion layer, and there are cracks inside the corrosion layer.