Study on Oxidation Behavior During Steam Oxidation of Cr-coated Zirconium Alloy at High-Temperature
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摘要: 为对多弧离子镀技术制备锆合金表面Cr涂层的耐高温氧化性能进行系统评价，对Cr涂层在水蒸气环境中的氧化行为进行研究。采用同步热分析仪获取Cr涂层在800~1400℃的氧化增重数据、X射线衍射仪分析相结构、扫描电子显微镜分析表面形貌和横截面各膜层厚度、能谱仪分析元素分布。结果表明，1200℃水蒸气氧化后Cr涂层表面生成了致密的保护膜，氧化后膜基界面结合质量良好，且锆基体上残留有一定量的Cr涂层；在1300℃水蒸气环境中Cr涂层短时间内对基体具有保护作用，1400℃时Cr涂层会迅速失去其保护效果。因此，锆合金表面Cr涂层具有优异的抗高温氧化性能，1200℃长时间高温水蒸气氧化后仍对锆基体具有较好的保护作用。Abstract: For systematic review of the high-temperature oxidation resistance of Cr-coated Zirconium alloy fabricated by multi-arc ion plating, the oxidation behavior during the steam oxidation of Cr coating at 800-1400°C was studied. The oxidation weight gains were obtained by simultaneous thermal analyzer. The X-ray diffractometer was used to analyze the phase structure, the scanning electron microscope was used to analyze the surface morphology and thickness of each film in cross section, and the energy dispersive spectrometer was used to analyze the element distribution. The dense Cr2O3 scales were formed on Cr coating after the steam oxidation at 1200℃, and the good interfacial bonding quality were observed between coating and substrate, as well as the residual Cr coating on Zr substrate were remained, and the residual Cr coating on Zr substrate were remained. The Cr coating could protect substrate for a short time at 1300℃ steam, but quickly lost its protection at 1400℃ steam. The Cr-coated Zirconium alloy has excellent high temperature oxidation resistance, and it still has good protection on substrate after the steam oxidation at 1200℃.
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Key words:
- Cr coating /
- Steam oxidation /
- Surface morphology /
- Oxidation rate
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图 1 Cr涂层样品高温水蒸气氧化后宏观照片
Figure 1. Macrophoto of Cr Coating Samples after High-Temperature Steam Oxidation
图 2 Cr涂层高温水蒸气氧化后样品表面XRD图
Figure 2. XRD Pattern of Cr Coating Samples after High-Temperature Steam Oxidation
图 3 Cr涂层高温水蒸气氧化后样品表面SEM图
Figure 3. SEM Images of Surface of Cr Coating Samples after High-Temperature Steam Oxidation
图 4 Cr涂层1300℃短时高温水蒸气氧化后样品表面SEM图
Figure 4. SEM Images of Surface of Cr Coating Samples after Steam Oxidation at 1300°C
图 5 Cr涂层高温水蒸气氧化后横截面SEM图
Figure 5. SEM Images of Cross-Section of Cr Coating Samples after High-Temperature Steam Oxidation
图 6 Cr涂层高温水蒸气氧化后横截面EDS能谱图
Figure 6. Cross-section EDS Maps of Cr Coating Samples after High-Temperature Steam Oxidation
图 7 Cr涂层高温水蒸气氧化后横截面膜层厚度分布趋势
Figure 7. Thickness Distribution Trend of Cross-Sectional Film after High-Temperature Steam Oxidation
图 8 Cr涂层高温水蒸气氧化动力学曲线
Figure 8. Oxidation Kinetics of Cr Coating Samples during High-Temperature Steam Oxidation
表 1 锆合金表面Cr涂层高温水蒸气氧化试验条件
Table 1. Parameters of High-Temperature Steam Oxidation of Cr-coated Zirconium Alloy
试验温度/℃ 800 900 1000 1100 1100 1100 1200 1200 1200 1300 1400 氧化时间/min 240 240 240 60 150 240 60 150 240 30 10 
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