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Exposure of 304L and 310S in chlorinating gasification environments

机译：在氯化气化环境中暴露304L和310S

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This work examines the difference in behaviour between two austenitic steels, 304L and 310S, in a simulated environment with carbon and oxygen activities typical of the syngas cooler of a steam blown gasifier. The cyclic exposures were performed with and without addition of 500 ppm HCl for a total duration of 960 h. The oxide layers (200-600 nm) were studied using TEM, a focused ion beam microscope with EDX (FIB-EDX), electron back scattered diffraction (EBSD), SEM and X-ray diffraction (XRD). For 304L, a Cr and Ni depleted zone with a ferritic structure was observed below the oxide layer and a thin, manganese rich layer at the metal/oxide interface. For 310S, circular oxide patches were observed on the surface after exposure with HCl. These displayed elevated concentration of Al, Ca and Si, typical of inclusions. Results indicate that the addition of HCl results in a difference in oxide quality and structure but that HCl at the level of this study has little impact on the sound metal thickness.
机译：这项工作研究了在模拟环境中具有蒸汽吹气式气化炉合成气冷却器典型的碳和氧活度的两种奥氏体钢304L和310S在性能上的差异。在添加和不添加500 ppm HCl的情况下进行循环暴露，总时间为960 h。使用TEM，具有EDX的聚焦离子束显微镜（FIB-EDX），电子背散射衍射（EBSD），SEM和X射线衍射（XRD）对氧化物层（200-600 nm）进行了研究。对于304L，在氧化物层下方观察到了具有铁素体结构的Cr和Ni耗尽区，在金属/氧化物界面处发现了一层薄的富锰层。对于310S，暴露于HCl后在表面上观察到圆形氧化物斑块。这些显示出较高的Al，Ca和Si浓度，这是夹杂物的典型特征。结果表明，加入HCl会导致氧化物质量和结构发生变化，但是HCl在本研究水平上对声金属厚度的影响很小。

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