油气田腐蚀环境中N80钢和3Cr钢的腐蚀行为
Corrosion Behavior of N80 and 3Cr Steel in Oil and Gas Field Environment
摘 要
采用失重法、X射线衍射法、扫描电镜观察及能谱分析等方法比较研究了N80钢和3Cr钢在模拟胜利油田某油井腐蚀环境中的腐蚀行为。结果表明: 在试验条件下, N80钢和3Cr钢的腐蚀速率随腐蚀时间的延长均呈现先急剧降低后缓慢降低的趋势, N80钢的腐蚀速率明显高于3Cr钢的；腐蚀360 h后, N80钢表面形成的腐蚀产物膜呈双层结构, XRD测试结果表明两层产物膜均由FeCO3构成, 后期沉淀形成的外层膜较为疏松, 原位形成的内层膜致密完整, 计算得到双层产物膜的平均密度为1.54 g/cm3；3Cr钢表面形成的腐蚀产物膜为致密完整的单层膜结构, 由FeCO3和Cr(OH)3构成, 产物膜平均密度为2.571 g/cm3。3Cr钢表面形成的腐蚀产物膜的保护性远远优于N80钢表面形成的腐蚀产物膜的。
腐蚀速率
腐蚀产物膜
N80钢
3Cr钢
CO2 corrosion
corrosion rate
corrosion scale
N80 steel
3Cr steel
Abstract
The corrosion behavior of N80 steel and 3Cr steel were investigated in a simulated corrosion environment of Shengli oil field by weight-loss method, XRD, SEM and EDS. The results indicate that the corrosion rate of N80 steel and 3Cr steel showed a sharp decrease first and then slow decrease with prolongation of corrosion time under experimental conditions, and the corrosion rate of N80 steel was larger than that of 3Cr steel. After 360 hours corrosion test, the corrosion scale of N80 steel formed with a double-layer structure and XRD result showed that both layers were composed of FeCO3. The later formed outer layer was loose and the inner layer was compact and integriated. The average density of the double-layer corrosion scale was 1.54 g/cm3. The corrosion scale of 3Cr steel was a compact single layer film composed of FeCO3 and Cr(OH)3 and its average density was 2.571 g/cm3. It can be concluded that the protectiveness of 3Cr steel corrosion scale was much better than that of N80 steel.
中图分类号 TG172 DOI 10.11973/fsyfh-201606013
所属栏目 试验研究
基金项目
收稿日期 2015/11/2
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备注李勇(1973-), 高级工程师, 博士, 主要从事海上油气田采油工程技术研究和管理方面的工作,
引用该论文: LI Yong. Corrosion Behavior of N80 and 3Cr Steel in Oil and Gas Field Environment[J]. Corrosion & Protection, 2016, 37(6): 494
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参考文献
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【3】IKEDA A, UEDA M, MUKAI S. CO2 behavior of carbon and Cr steels[C]//The 39th NACE Annual Conference. Houston:NACE, 1984.
【4】孙建波, 柳伟, 常炜, 等. 低铬X65管线钢CO2腐蚀产物膜的特征及形成机制[J]. 金属学报, 2009, 45(1):84-90.
【5】刘会, 朱世东, 赵国仙, 等. 动态和静态下CO2分压对P110钢腐蚀行为的影响[J]. 腐蚀与防护, 2009, 30(8):551-554.
【6】孙丽, 徐庆磊, 方炯, 等. CO2腐蚀与防护研究[J]. 焊管, 2009, 32(3):23-26.
【7】陈长风, 赵国仙, 路民旭, 等. 含Cr油套管钢CO2腐蚀产物膜特征[J]. 中国腐蚀与防护学报, 2002, 22(6):335-338.
【8】PIGLIACAMPO L, GONZALES J C, TURCONI G L. Window of application an operational track of low carbon 3Cr steel tubular[C]//The 61st NACE Annual Conference. Houston:NACE, 2006.
【9】DUGSTAD A. Fundamental aspects of CO2 metal loss corrosion-part 1:mechanism[C]//The 61st NACE Annual Conference. Houston:NACE, 2006.
【10】DEAN J A. Lang′s Handbook of Chemistry[M]. New York:McGraw-Hill Book Company, 1973:7.
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