MA956在超临界水环境中的腐蚀性能

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Corrosion Behavior of MA956 in Supercritical Water

摘要: 研究MA956在550/600/650℃超临界水(SCW)中的腐蚀特性,采用扫描电镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)分析氧化膜的表面形貌、组织结构和元素分布。由MA956的腐蚀增重曲线可知,其在SCW中腐蚀1000 h后其重量基本不变,具有优良的抗腐蚀性能。MA956在SCW中形成的氧化膜分层不明显,为单层结构,氧化膜中富Al、贫Fe。当温度大于或等于600℃时,腐蚀1000 h试样表面分布着大量的Al2O3白色颗粒物,在650℃时白色颗粒物的平均尺寸达8μm。经预氧化的MA956抗腐蚀性能进一步提高,1000 h后在其表面依然光滑平整,并未出现点蚀坑。
- MA956 /
- 腐蚀 /
- 超临界水 /
- 氧化膜 /
- 预氧化
Abstract: The corrosion behavior of MA956 in SCW at 550/600/650 was studied. The℃ morphology, structure and elements distribution of oxide film was studied through SEM, EDS and XPS. The weight gain results of 1000 h immersion in SCW shows that MA956 exhibits excellent resistance to corrosion and the surface film is single layer, rich in Al but poor in Fe. A large amount of Al2O3 has been observed on the surface film at temperature of or above 600℃, and the size reaches to 8 μm at 650℃. Meanwhile, the pre-oxidized MA956 has even higher corrosion resistance. The surfaces of the speciments are smooth and intact and no pitting is observed after exposure for 1000 h in SCW.
- MA956 /
- Corrosion /
- SCW /
- Oxide film /
- Pre-oxidation