气固相硫协同作用下水冷壁的高温腐蚀特性

doi:10.16085/j.issn.1000-6613.2017-0913

化工进展 ›› 2018, Vol. 37 ›› Issue (02): 452-458.DOI: 10.16085/j.issn.1000-6613.2017-0913

气固相硫协同作用下水冷壁的高温腐蚀特性

王健¹, 黄亚继¹, 邹磊², 岳峻峰², 徐力刚¹, 杨钊¹, 查健锐¹, 夏文青¹

1 东南大学能源热转换及其过程测控教育部重点实验室, 江苏南京 210096;
2 江苏方天电力技术有限公司, 江苏南京 211102

收稿日期:2017-05-16 修回日期:2017-06-14 出版日期:2018-02-05 发布日期:2018-02-05
通讯作者: 黄亚继,教授,从事大气污染控制和洁净煤燃烧技术研究。
作者简介:王健(1992-),男,硕士研究生,从事电站锅炉高温腐蚀研究。E-mail:220150424@seu.edu.cn。
基金资助:
国家自然科学基金项目（51676040）。

Characteristic for high temperature corrosion of water wall tube under gas-solid phase sulfur

WANG Jian¹, HUANG Yaji¹, ZOU Lei², YUE Junfeng², XU Ligang¹, YANG Zhao¹, ZHA Jianrui¹, XIA Wenqing¹

1 Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China;
2 Jiangsu Frontier Electric Technology Limited Company, Nanjing 211102, Jiangsu, China

Received:2017-05-16 Revised:2017-06-14 Online:2018-02-05 Published:2018-02-05

摘要/Abstract

摘要： 利用高温管式炉对电站锅炉水冷壁受热面常用的两种管材（12Cr1MoVG和15CrMoG）开展高温腐蚀实验研究，采用腐蚀增重法，得出气相硫、气固相硫作用下试片的腐蚀动力学曲线，并利用SEM和EDS对腐蚀试片表面及断面的微观形貌和元素成分进行分析。结果表明：两种材料的腐蚀动力学曲线都满足双对数曲线规律，气固相硫协同作用对金属的腐蚀性强于单因素气相硫的影响，15CrMoG的抗腐蚀性能优于12Cr1MoVG；腐蚀层大致可以分为3层，依次为剥离叶片层、过渡层和腐蚀渗透层，气相硫腐蚀下腐蚀层较厚并且质地紧密，气相硫与固相硫协同腐蚀下腐蚀层较薄并且质地疏松，极易剥落；此外腐蚀层中存在硫元素富集现象，腐蚀渗透层中的硫元素质量分数高达6.65%，并且氧元素含量从金属基体表面到腐蚀层表面呈现递增规律。

关键词: 高温腐蚀, 水冷壁材料, 气固相硫, 元素迁移

Abstract: The high temperature corrosion experiments of power plant boiler water wall tube materials (12Cr1MoVG and 15CrMoG) have been made using the test bed-high temperature tube furnace. Corrosion mass gain method was used to gain the corrosion kinetics curve under gas phase sulfur and gas-solid phase sulfur. Furthermore, the micromorphology and element contents of corrosion test block were analyzed by SEM and EDS. The results showed that the corrosion kinetics of 12Cr1MoVG and 15CrMoG can be described by the double logarithmic equation. The corrosivity of interaction conditions was much stronger than that of gaseous S. The corrosion resistance of 15CrMoG was superior than that of 12Cr1MoVG. It is revealed that the corrosion layer can be roughly divided into three layers, namely, stripping blade layer, transition layer and corrosion permeability layer. When exposed to the condition of gas phase sulfur, the corrosion layer is thick and compact. When exposed to the interaction conditions of gas phase sulfur and solid phase sulfur, the corrosion layer is thin, brittle and easy to spall. In addition, the concentration of sulfur is present in the corrosion layer, and the sulfur mass fraction in corrosion permeability layer is as high as 6.65%. The oxygen content increases from the surface of the metal substrate to the surface of the corrosion layer.

Key words: high temperature corrosion, water wall materials, gas-solid phase sulfur, element migration

中图分类号:

TK224.94

王健, 黄亚继, 邹磊, 岳峻峰, 徐力刚, 杨钊, 查健锐, 夏文青. 气固相硫协同作用下水冷壁的高温腐蚀特性[J]. 化工进展, 2018, 37(02): 452-458.

WANG Jian, HUANG Yaji, ZOU Lei, YUE Junfeng, XU Ligang, YANG Zhao, ZHA Jianrui, XIA Wenqing. Characteristic for high temperature corrosion of water wall tube under gas-solid phase sulfur[J]. Chemical Industry and Engineering Progress, 2018, 37(02): 452-458.

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气固相硫协同作用下水冷壁的高温腐蚀特性

Characteristic for high temperature corrosion of water wall tube under gas-solid phase sulfur

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