加热管盘管泄漏原因分析  

Cause analysis of leakage for heating coil

作　　者：郭海霞[1] 张欣耀[1] 李慧[1] GUO Hai-xia;ZHANG Xin-yao;LI Hui(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471023

出　　处：《物理测试》2020年第3期46-50,共5页Physics Examination and Testing

摘　　要：某加热管组的加热管盘管材质为BFe10-1-1铜合金,设备使用几年后发生泄露。采用光学金相显微镜和扫描电子显微镜对加热管盘管的失效原因进行分析,找到了失效模式和原因。加热管组的加热管盘管失效模式为焊缝处发生脱镍腐蚀中的栓状腐蚀。失效原因为加热管盘管焊缝处金相组织存在枝晶偏析,枝晶间被择优脱镍腐蚀并氧化;加热管盘管焊缝内表面不平整,容易留存冷凝水,腐蚀孔一旦形成后,也更容易存储和富集腐蚀性元素S和Cl的冷凝水,加剧腐蚀。The material of heating coil of one heating pipe set is BFe10-1-1 copper alloy.The leakage of equipment occurred after use for several years.The failure reasons for heating coil were analyzed by optical metallographic microscope(OM)and scanning electron microscope(SEM).The failure mode and reason were found.The failure mode for heating coil of heating pipe set was bolt-like corrosion of nickel-removal corrosion occurred at the weld seam.There were two reasons for failure.The dendrite segregation existed in the metallographic structure of weld seam of heating pipe coil,and the dendrites were preferentially corroded by nickel-removal corrosion and then oxidized.The inner surface of the weld seam of heating coil was uneven and the condensate water was easily to be retained.Once the corrosion hole was formed,the condensate water containing corrosive elements(S and Cl)was more easily stored and enriched,which aggravated the corrosion.

关 键 词：加热管盘管 BFE10-1-1 脱镍腐蚀 

分 类 号：TG115[金属学及工艺—物理冶金]