Sanicro 25钢在高硫煤灰/模拟烟气中的高温腐蚀行为研究  

High Temperature Corrosion Behavior of Sanicro 25 Steel in High-sulfur Coal Ash/simulated Flue Gas

作　　者：官宇 刘光明[1] 张民强 刘欢欢 柳志浩 龚兵兵 GUAN Yu;LIU Guangming;ZHANG Minqiang;LIU Huanhuan;LIU Zhihao;GONG Bingbing(School of Material Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;Dongfang Boiler Group Co.Ltd.,Material Research Institute,Zigong 643001,China)

机构地区：[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

出　　处：《中国腐蚀与防护学报》2022年第4期681-686,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51961028)。

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Cr_(2)O_(3)和Fe_(2)O_(3);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。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 Cr_(2)O_(3) and Fe_(2)O_(3).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.

关 键 词：Sanicro 25钢 高温腐蚀 高硫煤灰 硫酸盐 

分 类 号：TG174[金属学及工艺—金属表面处理]