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中国腐蚀与防护学报  2022, Vol. 42 Issue (4): 681-686    DOI: 10.11902/1005.4537.2021.155
  研究报告 本期目录 | 过刊浏览 |
Sanicro 25钢在高硫煤灰/模拟烟气中的高温腐蚀行为研究
官宇1, 刘光明1(), 张民强2, 刘欢欢1, 柳志浩1, 龚兵兵1
1.南昌航空大学材料科学与工程学院 南昌 330063
2.东方电气集团东方锅炉股份有限公司 自贡 643001
High Temperature Corrosion Behavior of Sanicro 25 Steel in High-sulfur Coal Ash/simulated Flue Gas
GUAN Yu1, LIU Guangming1(), ZHANG Minqiang2, LIU Huanhuan1, LIU Zhihao1, GONG Bingbing1
1.School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2.Dongfang Boiler Group Co. Ltd., Material Research Institute, Zigong 643001, China
全文: PDF(3852 KB)   HTML
摘要: 

测试了Sanicro 25钢表面涂覆煤灰后在650 和700 ℃下高硫煤灰/模拟烟气环境中的高温腐蚀动力学,并通过 SEM、EDS和XRD等对腐蚀产物的微观形貌、元素分布及物相组成进行分析。结果表明：Sanicro 25钢的腐蚀速率随着温度的升高而加快；650 ℃时试样表面生成了较完整、致密的保护性氧化层,合金具有良好的耐蚀性,腐蚀产物相主要为Cr2O3和Fe2O3；700 ℃时发生一定程度的热腐蚀,腐蚀过程分为高温氧化阶段和氧化膜被熔融硫酸盐破坏加速腐蚀阶段,腐蚀产物大量剥落,有明显失重。
关键词 ： Sanicro,  25钢,  高温腐蚀,  高硫煤灰,  硫酸盐    
Abstract：

The high temperature corrosion behavior of Sanicro 25 steel beneath deposition of artificial high-sulfur coal ash in an simulated boiler atmosphere was studied at 650 and 700 ℃ for 2000 h. Meanwhile, samples were taken out at certain intervals, cleaned and weighed, to obtain corrosion kinetics data. Further, the microstructure, element distribution and phase composition of the corrosion products were characterized by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results indicate that the corrosion rate of Sanicro 25 steel accelerated with the increasing temperature. A relative complete and dense protective oxide scale was formed on the surface of the alloy at 650 ℃, thus the alloy had good corrosion resistance. The corrosion products were composed mainly of Cr2O3 and Fe2O3. A certain degree of hot corrosion occurred at 700 ℃. The corrosion process could be divided into high temperature oxidation stage and molten sulfate accelerated corrosion stage, the later stage corresponds to molten salts induced destroy of the oxide scale, while a number of corrosion products peeled off and the alloy had obvious mass loss.
Key words： Sanicro 25 steel    high temperature corrosion    high-sulfur coal    sulfate
收稿日期: 2021-07-06     
ZTFLH:  TG174  
基金资助:国家自然科学基金(51961028)
通讯作者: 刘光明     E-mail: gemliu@126.com
Corresponding author: LIU Guangming     E-mail: gemliu@126.com
作者简介: 官宇,男,1996年生,硕士生
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官宇
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引用本文:

官宇, 刘光明, 张民强, 刘欢欢, 柳志浩, 龚兵兵. Sanicro 25钢在高硫煤灰/模拟烟气中的高温腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 681-686.
Yu GUAN, Guangming LIU, Minqiang ZHANG, Huanhuan LIU, Zhihao LIU, Bingbing GONG. High Temperature Corrosion Behavior of Sanicro 25 Steel in High-sulfur Coal Ash/simulated Flue Gas. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 681-686.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.155      或      https://www.jcscp.org/CN/Y2022/V42/I4/681

图1  Sanicro 25钢在高硫煤灰/模拟烟气环境中的腐蚀动力学曲线
图2  Sanicro 25钢在腐蚀2000 h后宏观表面形貌图
图3  Sanicro 25钢在高硫煤灰/模拟烟气中的腐蚀产物XRD谱
图4  Sanicro 25钢在不同温度的高硫煤灰/模拟烟气中腐蚀2000 h后表面微观形貌及相应能谱图
图5  Sanicro 25钢在不同温度下高硫煤灰/模拟烟气腐蚀2000 h后截面微观形貌及相应能谱图
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