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采用静态增重法研究了00Cr25Ni22Mo2N奥氏体不锈钢在不同温度下的循环氧化动力学曲线。结果表明,00Cr25Ni22Mo2N不锈钢在700℃时的氧化动力学曲线是一条平行于时间轴的直线,这说明其在该温度下氧化反应非常微弱;在800和900℃时的氧化动力学曲线遵循抛物线氧化规律,具有良好的抗氧化性能。利用扫描电镜、能谱分析和X射线衍射对氧化膜的表面形貌、截面形貌和相组成进行研究,发现该钢在3个温度下都生成了致密和黏附性好的保护性氧化膜,700℃生成的氧化膜主要由Cr_2O_3和Fe_2O_3组成,氧化膜很薄;800℃生成的氧化膜由Cr_2O_3、Fe_2O_3和少量的Ni Cr_2O_4、FeCr_2O_4组成,氧化膜厚度增加;900℃生成的氧化膜由Cr_2O_3、Fe_2O_3和NiCr_2O_4组成,氧化膜厚度进一步增加。认为氧化膜组成和结构是00Cr25Ni22Mo2N不锈钢具有良好抗高温氧化性能的重要原因。
The cyclic oxidation kinetics curves of 00Cr25Ni22Mo2N austenitic stainless steel at different temperatures were studied by static weight method. The results show that the oxidation kinetics curve of 00Cr25Ni22Mo2N stainless steel at 700 ℃ is a straight line parallel to the time axis, indicating that its oxidation reaction is very weak at this temperature. The oxidation kinetics at 800 and 900 ℃ follow the parabolic oxidation law , With good anti-oxidation properties. The surface morphology, cross-section morphology and phase composition of the oxide film were studied by SEM, EDS and X-ray diffraction. It was found that the oxide film formed dense and adherent oxide film at three temperatures. The oxide film formed at 700 ℃ mainly consists of Cr_2O_3 and Fe_2O_3 and the oxide film is very thin. The oxide film formed at 800 ℃ consists of Cr_2O_3, Fe_2O_3 and a small amount of Ni_ Cr_2O_4 and FeCr_2O_4, and the thickness of the oxide film increases. The oxide film formed at 900 ℃ consists of Cr_2O_3 , Fe 2 O 3 and NiCr 2 O 4, and the thickness of the oxide film further increases. That the oxide film composition and structure is 00Cr25Ni22Mo2N stainless steel has a good high temperature oxidation resistance of the important reasons.