显微组织对G3合金点蚀倾向的影响  

Influence of Microstructure on Tendency to Pitting Corrosion of G3 Alloy

作　　者：马含悦[1] 李春福[1] 冯朋飞[1] 杨阳[1] 孙延安[2] 

机构地区：[1]西南石油大学油气藏地质及开发国家重点实验室,成都610500 [2]大庆油田采油工程研究院,大庆163453

出　　处：《腐蚀与防护》2012年第3期193-195,共3页Corrosion & Protection

摘　　要：针对HastelloyG-3型镍基合金(G3合金)油套管腐蚀问题,通过动电位扫描,结合现代微观分析方法分析腐蚀产物等,研究显微组织结构对G3合金点蚀倾向的影响。结果表明,通过1170℃×60min(水冷)处理可以使组织均匀化并获得很好的室温γ相单相组织从而提高G3合金耐点蚀倾向;蚀孔易产生于晶界处、夹杂物处或基体析出相处,蚀孔底部产生的闭塞电池促使Fe、Cr、Ni溶解而生成含O、S的团状化合物,从而促使点蚀的发生。The influence of microstructure on the tendency to pitting of G3 alloy used for casing was studied by potentiodynamic scan and modern microscopic analysis methods.The results show that the γ phase was obtained by treatment of 1170 ℃×60 min（water）,which made the microstructure homogeneous and thus improved the pitting resistance of G3 alloy.Pitting occured at the grain boundaries,inclusions and matrix precipitates easily.The occluded cells generated at the pitting bottom made Fe,Cr,Ni dissolved and group-like compounds generated.

关 键 词：G3合金 点蚀 组织结构 电化学试验 显微观察 

分 类 号：TG172[金属学及工艺—金属表面处理]