N80油井注水管腐蚀失效分析
Analyses of Corrosion Failure of N80 Water Injection Tubing
摘 要
对一例腐蚀穿孔的表面氮化N80注水管进行了腐蚀产物X射线衍射分析和金相组织分析,结果表明失效注水管的腐蚀产物是Fe3O4和FeOOH,钢管近内壁母材存在大量的非金属夹杂物和带状组织,内壁表面粗糙度较大导致渗氮层不连续,是造成注水管发生严重氧腐蚀的主要原因,油井污水内含有大量的氯离子对注水管的腐蚀穿孔起到加速作用.
氮化
腐蚀
失效分析
water injection tubing
nitriding
corrosion
failure analysis
Abstract
A failed surface nitrided N80 water injection tubing was analyzed through microstructure examination and X-ray diffraction(XRD).The results showed that the corrosion products were Fe3O4 and FeOOH.There were a lot of non-metallic inclusions and banded structure in the metal adjacent to the inner surface of the tubing,and rough surface of the internal wall resulted in a discontinuous nitriding layer.Those might be the main reasons of the tubing corrosion.A mass of Cl- in the contaminated well water also accelerated the corrosion of the tubing.
中图分类号 TE982
所属栏目 失效分析
基金项目
收稿日期 2007/4/4
修改稿日期 2007/7/11
网络出版日期
作者单位点击查看
引用该论文: ZHANG Jun,LI Lian-bo,SHI Zhi-qiang. Analyses of Corrosion Failure of N80 Water Injection Tubing[J]. Corrosion & Protection, 2008, 29(4): 226～228
被引情况:
【1】黎小宝,邓承佯,江建东,吴根林,徐环宇, "飞机副翼前端开裂原因分析",腐蚀与防护 37, 88-91(2016)
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参考文献
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【4】孙贤文,柳得橹.CSP低碳钢的表面带状组织[J].电子显微学报,2003(6):558-559.
【5】周琦,付希圣,黄淑菊.石油专用管中的带状组织对低温区CO2腐蚀的影响[J].腐蚀与防护,2005(11):472-475.
【6】刘胜新.33Mn2V非调质油井管钢的相变特性及其应用[J].钢铁,2003(1):38-42.
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