Super304H不锈钢在605 ℃和640 ℃超临界水中的氧化行为

doi:10.11902/1005.4537.2024.225

中国腐蚀与防护学报

2025, Vol. 45

Issue (1): 209-216 CSTR: 32134.14.1005.4537.2024.225 DOI: 10.11902/1005.4537.2024.225

研究报告

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Super304H不锈钢在605 ℃和640 ℃超临界水中的氧化行为

陈辉¹, 徐福斌², 方亚雄¹, 朱忠亮³(

)

1 国家能源集团科学技术研究院有限公司南京 210046
2 国家能源集团泰州发电有限公司泰州 225300
3 华北电力大学电站能量传递转化与系统教育部重点实验室北京 102206

Oxidation Behavior of Super304H Stainless Steel in Supercritical Water at 605 and 640 ^oC

CHEN Hui¹, XU Fubin², FANG Yaxiong¹, ZHU Zhongliang³(

)

1 National Energy Group Science and Technology Research Institute Co., Ltd., Nanjing 210046, China
2 State Energy Group Taizhou Power Generation Co., Ltd., Taizhou 225300, China
3 Key Laboratory of Power Station Energy Transfer, Conversion and System, Ministry of Education, North China Electric Power University, Beijing 102206, China

引用本文:

陈辉, 徐福斌, 方亚雄, 朱忠亮. Super304H不锈钢在605 ℃和640 ℃超临界水中的氧化行为[J]. 中国腐蚀与防护学报, 2025, 45(1): 209-216.
Hui CHEN, Fubin XU, Yaxiong FANG, Zhongliang ZHU. Oxidation Behavior of Super304H Stainless Steel in Supercritical Water at 605 and 640 ^oC[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 209-216.

全文: PDF(14270 KB) HTML

摘要:

进行了605和640 ℃，26 MPa下超临界水环境中奥氏体不锈钢氧化2000 h实验，利用电子天平测量了氧化前后的试样增重，并采用场发射电子显微镜、能谱仪、X射线衍射仪以及X射线光电子能谱仪对氧化膜微观形貌、元素组成以及物相类型进行了分析。实验结果表明：氧化过程中氧化膜发生了剥落；氧化初期试样表面形成了结节状富铁氧化物，随着氧化时间的增加，富铁氧化物逐渐覆盖整个试样；氧化膜为双层结构，外层富铁内层富铬。温度和氧化时间影响氧化膜物相成分。氧化膜/基体界面存在薄的富铬氧化层，该富铬氧化层的存在影响了Super304H不锈钢抗氧化性能。研究结果为准确评价Super304H不锈钢抗氧化性能提供数据支撑。

关键词 ： Super304H不锈钢, 超临界水, 高温氧化, 氧化机理

Abstract：

The oxidation behavior of Super304H austenitic stainless steel in 605 and 640 ^oC, 26 MPa supercritical water for 2000 h was studied by intermittent weighing method. The mass change caused by oxidation in supercritical water was measured by electronic balance. The morphology, elemental composition and phase types of the oxide scales were examined by field emission electron microscope, energy spectrometer, X-ray diffractometer and X-ray photoelectron spectrometer. The results show that the oxide scale spalling occurs during the oxidation process. Nodular iron-rich oxides formed on the steel surface at the initial oxidation stage. With the increase in oxidation time, the iron-rich oxides gradually covered the whole surface of the test steel. The oxide scale was composed of a double layered structure, the outer layer rich in Fe and the inner layer rich in Cr. The temperature and oxidation time affect the phase composition of iron-rich oxides. A thin Cr-rich oxide layer can be observed at the oxide scale/substrate interface, which has an important impact on the oxidation resistance of Super304H. The results provide data support for the accurate evaluation of the oxidation resistance of Super304H stainless steel to supercritical water.

Key words： Super304H stainless steel supercritical water high-temperature oxidation oxidation mechanism

收稿日期: 2024-07-26 32134.14.1005.4537.2024.225

ZTFLH:

TK245

基金资助:国家重点研发计划(2022YFB4100403)

通讯作者: 朱忠亮，E-mail：zhzl@ncepu.edu.cn，研究方向为燃煤电站承压部件状态监测与寿命评估

Corresponding author: ZHU Zhongliang, E-mail: zhzl@ncepu.edu.cn

作者简介: 陈辉，男，1982年生，硕士，正高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.225 或 https://www.jcscp.org/CN/Y2025/V45/I1/209

图1 Super304H不锈钢在605和640 ℃超临界水中氧化增重曲线

图2 605 ℃/26 MPa超临界水中Super304H不锈钢氧化不同时间后的表面形貌

图3 640 ℃/26 MPa超临界水中Super304H不锈钢氧化不同时间后的表面形貌

图4 对应图2和3标记位置处的元素成分

图5 Super304H不锈钢在605 ℃氧化800 h后的表面形貌侧视图

图6 Super304H不锈钢在605和640 ℃超临界水环境中氧化不同时间后的XRD谱

图7 Super304H不锈钢在605和640 ℃超临界水环境中氧化2000 h后的XPS谱

图8 Super304H不锈钢在605和640 ℃超临界水环境中氧化不同时间后的横截面形貌

图9 Super304H不锈钢在605和640 ℃超临界水环境中氧化不同时间后横截面对应的元素分布

图10 氧化膜/基体界面附近局部放大图及沿标记线元素分布

图11 奥氏体钢在超临界水中的氧化膜生长过程原理图

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