摘要
通过宏观分析、金相、SEM、能谱、XRD等手段分析了水冷壁管失效原因。结果表明,水冷壁管发生了酸性氢腐蚀,锅炉长期水质较差,且运行过程中pH值偏低是其腐蚀减薄的主要原因,而腐蚀产物中沉积的Cu及其氧化物,形成垢下腐蚀环境,加速了水冷壁管的腐蚀,最终在锅炉介质应力作用下发生脆性爆管。
The failure causes of water wall tubes were analyzed by means of macro analysis,metallographic examination,scanning electron microscopy(SEM),energy spectrum analysis,and X-ray diffraction(XRD).The results showed that the acid hydrogen corrosion occurred on the water wall tube.Long-term poor water quality and low pH were the main reasons for the corrosion thinning.Copper and its oxides in the corrosion product formed under-deposit corrosive environment,which accelerated the corrosion of water wall tube.Finally,the brittle tube burst occurred under the stress of the boiler medium.
作者
张聪毅
潘恒沛
李雪峰
ZHANG Congyi;PAN Hengpei;LI Xuefeng(Luoyang Ship Material Research Institute,Luoyang 471023,China)
出处
《物理测试》
CAS
2021年第6期38-43,共6页
Physics Examination and Testing
关键词
失效分析
水冷壁管
酸腐蚀
氢损伤
failure analysis
water wall tube
acid corrosion
hydrogen damage
