摘要
采用光学显微镜、X射线荧光光谱仪、X射线衍射仪(XRD)、电化学测试等分析手段,对某洗化厂循环水换热器管束钢(20#钢)进行失效分析。分析结果表明:管束材质成分不符合标准20#钢成分的要求,管束材质的变化将影响其耐蚀性;又由于管束内表面结垢发生较为严重的垢下腐蚀,管束内表面存在氧化铁垢层使垢层内外形成氧浓差电池,构成大阴极小阳极腐蚀原电池。所以,垢下腐蚀是引起管束穿孔的主要原因。
Failure of heat exchanger at a wash of circulating water factory was analyzed by optical microscope,X-ray fluorescence spectrometer,X-ray diffraction(XRD),electrochemical test analysis method.The results show that chemical composition of heat exchanger didn't meet the standard of 20# steel.Due to the surface of the vascular bundles scaling there is a serious corrosion.inside surface of tubes exist iron oxide layer which led to the under-deposition corrosion because different concentration of oxygen inside and outside deposition form corrosion battery.Therefore,under-deposit corrosion is the main the main cause of tubes perforation.
出处
《辽宁石油化工大学学报》
CAS
2012年第3期54-57,62,共5页
Journal of Liaoning Petrochemical University
关键词
换热器
穿孔
腐蚀
失效
Heat exchanger
Perforation
Corrosion
Failure
