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为了认识Super304H钢在水蒸气环境中的氧化行为,设计了1组供货态Super304H在700℃水蒸气环境下的5~8h的氧化模拟实验.在氧化之后利用扫描电子显微镜(SEM)观察氧化膜的结构和能谱(EDS),分析了膜层不同位置点的成分,另外采用mapping功能从截面分析了氧化层中O、Cr、Fe、Ni、Cu元素的分布情况,同时采用XRD分析了氧化层中的具体物相.结果表明:氧化层为双层结构,内外氧化层界面为原始界面,内层氧化膜致密,外层氧化膜疏松,在内层与基体之间存在有保护作用的Cr_2O_3氧化层.内层氧化膜富含Cr、Ni,而外层氧化膜富含Fe,结合XRD结果可知:外层氧化物主要为Fe_2O_3、Fe_3O_4,内层氧化物为Cr_2O_3、NiO.
In order to understand the oxidation behavior of Super304H steel in water vapor environment, a series of simulation experiments of oxidation of Super304H steel were carried out at 700 ℃ for 5 ~ 8h under water vapor condition. Oxidation was observed by scanning electron microscopy (SEM) (EDS). The composition of the film at different positions was analyzed. In addition, the mapping function was used to analyze the distribution of O, Cr, Fe, Ni and Cu elements in the oxide layer by using the mapping function. Meanwhile, the oxidation The results show that the oxide layer has a double-layer structure, the interface between the inner and outer oxide layers is the original interface, the inner oxide layer is dense and the outer oxide layer is loose, and the protective layer Cr_2O_3 exists between the inner layer and the substrate Oxide layer. The inner oxide film is rich in Cr and Ni, while the outer oxide film is rich in Fe. According to XRD results, the outer oxide is mainly Fe 2 O 3 and Fe 3 O 4, while the inner oxide is Cr 2 O 3 and NiO.