C-276镍基合金在600℃超临界水中的腐蚀产物及形成机理研究  

Corrosion Products and Formation Mechanism of Hastelloy C-276 Alloy in Supercritical Water at 600℃

作　　者：李海丰[1] 范洪远[1] 张强[2] 邱绍宇[2] 王均[1] 

机构地区：[1]四川大学制造科学与工程学院,成都610065 [2]中国核动力研究设计院核燃料及材料国家级重点实验室,成都610041

出　　处：《核动力工程》2011年第3期38-42,共5页Nuclear Power Engineering

基　　金：国家重点基础研究发展计划资助项目(2007CB209802)

摘　　要：使用X射线衍射、X射线光电子谱和扫描电子显微镜,研究了C-276镍基合金在600℃、25 MPa超临界水中的腐蚀产物。结果表明,合金在该环境下形成了比较均匀、完整的氧化膜,其组成主要是NiO、NiCr2O4、Cr2O3和MoO2;氧化膜为双层结构,整体贫Ni、Mo;内层相对富Cr,外层疏松,对合金缺乏保护性,内层致密,有利于合金抗氧化;合金在该环境下的腐蚀产物形成机理类似于高温水环境下,外层Ni(OH)2、NiO的生长符合溶解再沉淀机制,内层Cr2O3则是通过内层富集的Cr与向内扩散的O反应形成的。The corrosion products of nickel-base alloy Hastelloy C-276 was investigated in supercritical water（SCW） at 600℃/25MPa through grazing incidence X-ray diffractometry,X-ray photoelectron spec-troscopy and scanning electron microscopy,respectively.The results show that the uniform and complete ox-ide film was observed in SCW,which was identified to mainly consist of NiO,NiCr2O4,Cr2O3 and MoO2;The oxide films that had duplex structure were in poor in Ni and Mo,but the inner layer was rich in Cr.The loose outer layer lacked of protective,while the compact inner layer was favor of antioxidation.The formation mechanism of corrosion products on alloy C-276 in supercritical water seemed to be similar to that in high temperature water.The Ni（OH）2,NiO outer layer grew by dissolution and precipitation mechanism,while the Cr2O3 inner layer oxide was formed by oxygen diffusing inward and reacting with the retained Cr.

关 键 词：C-276镍基合金 超临界水 腐蚀产物 

分 类 号：TE980.3[石油与天然气工程—石油机械设备]