254SMO超级奥氏体不锈钢换热板片的腐蚀失效原因  

Corrosion Failure Reason of 254SMO Super Austenitic Stainless Steel Heat Exchange Plat

作　　者：倪吉旭 雷沙沙 苏厚德[1,2] 谢哲蓉 赵昕 席钶沣 NI Jixu;LEI Shasha;SU Houde;XIE Zherong;ZHAO Xin;XI Kefeng(Gansu Lanke Petrochemical High-tech Equipment Co.,Ltd.,Lanzhou 730050,China;Shanghai Lanbin Petrochemical Equipment Co.,Ltd.,Shanghai 201518,China;Key Project Department,Petrochina Southwest Oil and Gas Field Branch,Chengdu 610000,China)

机构地区：[1]甘肃蓝科石化高新装备股份有限公司,兰州730050 [2]上海蓝滨石化设备有限责任公司,上海201518 [3]中石油西南油气田分公司重点项目部,成都610000

出　　处：《腐蚀与防护》2024年第7期114-120,共7页Corrosion & Protection

摘　　要：某煤化工厂用于废水处理项目的换热板片(材质254SMO)使用约半年就发生了腐蚀失效。对该厂废水水质进行了分析,并对该换热板片进行了宏观检查、成分分析、金相分析、扫描电镜分析和能谱分析。结果表明:废水介质的含盐量高、污染物种类繁多、介质温度较高,形成了特殊腐蚀环境,且换热板片的密封圈会形成缝隙结构,由换热板片所处的介质环境和自身结构导致该板片发生点蚀和缝隙腐蚀,随着腐蚀的进行,最终造成254SMO超级奥氏体不锈钢换热板片失效泄漏。建议通过添加缓蚀剂和升级换热板材质等加强防护。The heat exchange plate(steel 254SMO)used in a wastewater treatment project at a certain coal chemical plant had undergone corrosion failure after about half a year of service.The wastewater quality of the factory was analyzed,and the heat exchange plate was subjected to macroscopic examination,composition analysis,metallographic analysis,scanning electron microscopy analysis,and energy spectrum analysis.The results show that the wastewater medium had a high salt content,a wide variety of pollutants,and a high medium temperature,forming a special corrosive environment.The sealing ring of the heat exchange plate would form a gap structure,which was caused by the medium environment and its own structure of the heat exchange plate.As the corrosion progresses,it ultimately led to the failure and leakage of the 254SMO super austenitic stainless steel heat exchange plate.It was recommended to strengthen the protection of the system by adding corrosion inhibitors and upgrading the material of the heat exchange plate.

关 键 词：254SMO不锈钢 换热板片 腐蚀 失效分析 

分 类 号：TG172[金属学及工艺—金属表面处理]