论文部分内容阅读
运用静态等温氧化法研究了Ni-Cr-Mo-Cu镍基耐蚀合金在600、800和1000℃下的氧化特性,采用X射线衍射、扫描电子显微镜对氧化层进行了相结构和形貌的分析。结果表明:该合金的高温氧化动力学曲线近似呈立方抛物线规律,10h以后氧化过程主要受扩散控制,合金表面形成致密的氧化物薄膜,氧化物类型主要是Cr2O3和NiO、NiCr2O4。实验得到Ni-Cr-Mo-Cu耐蚀合金高温氧化速率常数为1.296×10-8exp(-Ea/RT),其表观活化能(Ea)为200.25kJ/mol,位于Cr2O3氧化层的活化能和NiO氧化层的活化能之间。
The oxidation behavior of Ni-Cr-Mo-Cu nickel base corrosion resistant alloy at 600, 800 and 1000 ℃ was studied by static isothermal oxidation method. The phase structure and morphology of the oxide layer were characterized by X-ray diffraction and scanning electron microscope analysis. The results show that the oxidation kinetics curve of the alloy has a cubic parabola law approximately. After 10h, the oxidation process is mainly controlled by diffusion. The oxide film is mainly composed of Cr2O3, NiO and NiCr2O4. The oxidation rate constant of Ni-Cr-Mo-Cu corrosion resistant alloy was 1.296 × 10-8exp (-Ea / RT) and its apparent activation energy (Ea) was 200.25kJ / mol. The activation energy And the activation energy of the NiO oxide layer.