摘要
研究了奥氏体不锈钢304NG在550、600和650℃超临界水环境下的腐蚀行为。采用扫描显微镜、X射线能谱仪、X射线衍射仪分析了氧化膜的腐蚀形貌、组织结构和成分分布。实验结果表明,试样在3种不同温度下经1000h腐蚀实验后的增重均符合幂函数规律,但650℃时的腐蚀增重与600℃时的相比大幅下降,其主要原因为在较高温时,Cr的扩散速度快,试样表面氧化膜能够维持保护性从而使疖状腐蚀分布数量减少所致。
The corrosion behavior of 304NG stainless steel was investigated in supercritical water（SCW）at 550,600and 650℃.The SEM,EDS and XRD were used to analyze the corrosion morphology,structure and chemical composition of oxide film.The experiment results show that the oxidation of 304NG stainless steel approximately follows power function growth kinetics after exposure to supercritical water for 1 000h, while the weight gain decreases drastically at 650℃.The possible mechanism of the anomalous temperature dependence of oxidation kinetics is ascribed to the rapid diffusion of Cr at higher temperature,maintaining protectiveness of oxide film on the sample surface,and finally resulting in the decrease of the nodular corrosions.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2010年第9期1093-1098,共6页
Atomic Energy Science and Technology
基金
国家重点基础研究发展计划资助项目(2007CB209802)
关键词
304NG不锈钢
超临界水
氧化膜
疖状腐蚀
304NG stainless steel
supercritical water
oxide film
nodular corrosion
