乙烯裂解炉炉管腐蚀穿孔失效分析
Failure Mechanism Analysis of Corrosion Perforation of an Ethylene Cracking Tube
摘 要
针对一段发生腐蚀穿孔失效的乙烯裂解炉炉管,采用宏观腐蚀形貌观察、材料化学成分分析、显微组织检查、腐蚀产物能谱分析等理化检验,结合炉管的工作条件进行失效分析,并提出建议改进措施.结果表明,向火面炉管腐蚀穿孔失效是由于高温下Cr2O3保护膜破坏而发生的金属粉化失效.对此次失效机理的探讨表明金属粉化在高于800 ℃温度下仍有可能发生,表面Cr2O3保护膜的破坏是关键因素.
腐蚀穿孔
金属粉化
失效分析
ethylene cracking tube
corrosion perforation
metal dusting
failure analysis
Abstract
An ethylene cracking tube was perforated because of corrosion.The macro corrosion morphology,chemical composition of the material,metallographic examination,EDS and service conditions were investigated and improving measures were suggested.The results showed that the side faced to the fire directly was heated to so high temperature that the protective film of Cr2O3 was destroyed,which caused the metal dusting.The discussion of the failure mechanism demonstrated that at the temperature over 800 ℃ metal dusting failure could also happen for HP40 material mainly because of the destruction of Cr2O3 protective film.
中图分类号 TG174 TE963
所属栏目 失效分析
基金项目
收稿日期 2014/5/10
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备注刘刚(1989-),硕士研究生,从事腐蚀失效分析工作.
引用该论文: LIU Gang,JIANG Xiao-dong,DONG Lei-yun. Failure Mechanism Analysis of Corrosion Perforation of an Ethylene Cracking Tube[J]. Corrosion & Protection, 2015, 36(5): 502
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【5】李处森,杨院生.金属材料在高温碳气氛中的结焦与渗碳行为[J].中国腐蚀与防护学报,2004,24(3):188-192.
【6】GRABKE H J.Carburization,carbide formation,metal dusting,coking[J].Materiali in Tehnologije,2002,36(6):297-305.
【7】CHUN C M,BHARGAVA G,RAMANARAYANAN T A.Metal dusting corrosion of nickel-based alloys[J].Journal of the Electrochemical Society C,2007,154(5):231-240.
【8】STRAUB S,GRABKE H J.Role of alloying elements in steels on metal dusting[J].Materials and Corrosion,1998,49(5):321-327.
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