摘要
采用宏观形貌观察、X衍射分析、红外光谱分析和热重分析,对某化工厂运行约半年即泄漏的20#钢换热管进行了腐蚀过程分析.结果表明:管内壁结垢严重,发生了垢下腐蚀;同时,Cl在垢下闭塞区中富集并引发"自催化"效应,加速了垢下腐蚀的进程,导致换热管半年内就发生泄漏.
The corrosion process of heat exchange tube made by 20 steel,which has been leaking for about half a year in a chemical plant,was analyzed by means of macroscopic morphology observation,X-ray diffraction analysis,infrared spectrum analysis and thermogravimetric analysis.The results show that the scale on the inner wall of the tube is serious,and the corrosion under the scale occurs.At the same time,Cl accumulates in the occluded area under the scale and causes the autocatalytic effect,which further accelerates the process of the corrosion,and causes the leakage of the heat exchange tube within half a year.
作者
陈丽娟
魏博
徐向红
CHEN Lijuan;WEI Bo;XU Xianghong(School of Chemical Engineering,Xinjiang University,Urumqi Xinjiang 830046,China;Xinjiang Key Laboratory of Cleaner Transition of Coal&Chemical Process,Xinjiang University,Urumqi Xinjiang 830046,China)
出处
《新疆大学学报（自然科学版）（中英文）》
2021年第2期163-167,共5页
Journal of Xinjiang University(Natural Science Edition in Chinese and English)
基金
国家自然科学基金(51966017)
新疆维吾尔自治区2019教学改革项目(XJJG201911)。
关键词
换热管
20#钢
垢下腐蚀
点蚀
heat exchange tube
20#steel
under-deposit corrosion
pitting corrosion
