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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)  2018, Vol. 52 Issue (8): 1535-1541    DOI: 10.3785/j.issn.1008-973X.2018.08.013
Energy and Power Engineering     
High-temperature corrosion properties of water wall material 15CrMoG under reducing atmosphere
XU Li-gang1, HUANG Ya-ji1, WANG Jian1, ZOU Lei2, YUE Jun-feng2
1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China;
2. Jiangsu Frontier Electric Technology Co. Ltd, Nanjing 211102, China
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Abstract  

The experiment around high-temperature properties of water wall material 15CrMoG was conducted, aiming at the situation that severe high-temperature corrosion occurred in most power plant under low-nitrogen combustion reducing atmosphere. Two reducing atmospheres were simulated by preparing standard gases, and specimens were coated with ash deposit to simulate the corrosivity of ash. The effects of different atmospheres and ash deposit were analyzed by mass gain curves, and scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were utilized to observe the micro-morphology, measure the elements distribution, and analyze the mechanism of high-temperature corrosion. Results showed that the CO+H2S+O2+N2 atmosphere was more corrosive than the H2S+O2+N2 atmosphere, and the corrosion process was sustained by CO. The corrosion degree of deposit-coated specimens was higher than deposit-free specimens. The corrosion process of H2S can be slowed down by compact oxide layer and enrichment of Cr, but CO can fade the protective effect. Alkali metal in the ash deposit could migrate to matrix and alkali metal salt could destruct the oxide layer and corrode the metal matrix, but the corrosion of alkali metal salt was slightly inhibited under reducing atmosphere.

Received: 15 November 2017      Published: 23 August 2018
CLC:  TK224  
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Cite this article:

XU Li-gang, HUANG Ya-ji, WANG Jian, ZOU Lei, YUE Jun-feng. High-temperature corrosion properties of water wall material 15CrMoG under reducing atmosphere. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2018, 52(8): 1535-1541.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2018.08.013     OR     http://www.zjujournals.com/eng/Y2018/V52/I8/1535


还原性气氛下水冷壁材料15CrMoG的高温腐蚀特性

针对多数电厂在低氮燃烧还原性气氛下水冷壁高温腐蚀严重的现状，在高温管式炉中进行水冷壁材料15CrMoG的高温腐蚀试验.试验中以配制好的标气模拟锅炉水冷壁贴壁处的2种还原性气氛，试片表面涂积灰模拟灰腐蚀影响.通过腐蚀增重曲线分析不同气氛和积灰对于腐蚀的影响，采用扫描电子显微镜（SEM）和能量色能谱（EDS）观测材料试片的腐蚀微观形貌和元素成分，研究高温腐蚀机理.结果表明，CO+H2S+O2+N2气氛比H2S+O2+N2气氛的腐蚀能力更强，CO使得腐蚀能够持续进行，有积灰试片的腐蚀程度略高于无积灰试片；致密氧化层以及Cr元素向金属基体富集的特性能够减缓H2S渗透腐蚀，CO的存在削弱氧化层和Cr的保护作用；积灰中的碱金属能够向金属基体迁移，碱金属盐类能够破坏氧化层并且侵蚀金属基体，但是在还原性气氛下积灰腐蚀受到一定抑制.

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