The isothermal oxidation behavior of 17Cr-0.85Si-0.5Nb-1.2Cu ferritic stainless steel in air was studied from 850°C to 1050°C by analyzing its weight gain after oxidation. The kinetic curves were plotted using the oxidation weight-gain data, and the structure, surface morphology, and element distribution of the oxide films were analyzed by XRD, SEM, and EDS. The results showed that the oxidation kinetics curves at 850°C and 950°C followed a parabolic law, and a continuous and dense oxide film composed of Cr2O3 and MnCr2O4, FeCr2O4, and Cu-Cr rich spinel was formed, which reveals that the steel displayed good oxidation resistance. When the temperature was increased to 1050°C, the oxidation kinetics curves gradually changed from parabolic to linear after 40 h exposure, which indicated that the oxidation resistance significantly worsened. A lower oxidation resistance was observed at 1050°C due to the formation of a large amount of Fe2O3 on the surface and the volatilization of the inner Cr2O3 layer.

中文翻译：

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含铜17Cr铁素体不锈钢的高温氧化行为

通过分析17Cr-0.85Si-0.5Nb-1.2Cu铁素体不锈钢在850～1050℃空气中的等温氧化行为，分析其氧化增重。使用氧化增重数据绘制动力学曲线，并通过XRD、SEM和EDS分析氧化膜的结构、表面形貌和元素分布。结果表明，850℃和950℃的氧化动力学曲线呈抛物线规律，形成连续致密的Cr2O3和MnCr2O4、FeCr2O4和富Cu-Cr尖晶石氧化膜，表明钢表现出良好的抗氧化性。当温度升高到 1050°C 时，氧化动力学曲线在暴露 40 h 后逐渐从抛物线变为线性，这表明抗氧化性显着恶化。