304NG在超临界水中腐蚀后氧化膜分析
Investigation of Oxide Scale on 304NG Exposed in Supercritical Water
尹开锯 1邱绍宇 1唐睿 1张强 1张乐福2
作者信息
- 1. 中国核动力研究设计院反应堆燃料与材料重点实验室,成都,610041
- 2. 上海交通大学核科学与工程学院,上海,200240
- 折叠
摘要
研究了奥氏体不锈钢304NG(以下简称304NG)在压力为25 MPa,温度分别为500、550、600、650℃超临界水中的腐蚀行为,通过扫描电镜-电子能谱(SEM-EDX)、X射线衍射(XRD)对304NG试样氧化膜微观组织的研究表明:304NG在超临界水中腐蚀后,表面氧化膜由岛状和非岛状2种不同形貌的腐蚀相组成.其中,含岛状腐蚀相的氧化膜具有双层结构,外层为Fe3O4相,内层为Fe3O4和FeCr2O4相;不含岛状腐蚀相的氧化膜为单层结构,氧化膜中含有Fe3O4和FeCr2O4相.同时,304NG在超临界水中氧化膜存在脱落现象,氧化膜脱落程度随温度升高而加剧.
Abstract
The corrosion behavior of an austenitic stainless steel 304NG exposed to supercritical water (SCW) at 500℃, 550℃, 600℃ and 650℃/25 Mpa is investigated by means of scanning electron microscope/energy dispersive X-ray spectroscopy and X-ray diffraction. The surface morphology is composed of oxide islands and relative smooth base oxide. Oxide islands is a dual-layered oxide scale, which is mainly composed of an outer magnetite (Fe3O4) layer and an inner magnetite/spinel-mixed (Fe3O4/FeCr2O4) layer, base oxide is a single-layered magnetite/spinel-mixed (Fe3O4/FeCr2O4) oxide scale. The oxide scale has a tendency to spall, which increases with the increasing of exposure temperature.
关键词
奥氏体不锈钢/超临界水/腐蚀/氧化膜脱落Key words
Austenitic stainless steel, Supercritical water, Corrosion, Oxide scale spalling引用本文复制引用
出版年
2012
NETL
NSTL
维普
万方数据