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.
参考文献
| [1] | 植田昌克.合金元素和显微结构对CO2/H2S环境中腐蚀产物稳定性的影响[J].石油与天然气化工,2005(01):43-52. |
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