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中国腐蚀与防护学报  2015, Vol. 35 Issue (5): 393-399    DOI: 10.11902/1005.4537.2014.196
  本期目录 | 过刊浏览 |
油田输油管线钢X65的腐蚀行为研究
刘栓1,2,赵霞1(),陈长伟1,侯保荣1,陈建敏2
2. 中国科学院宁波材料技术与工程研究所 海洋新材料与应用技术重点实验室 宁波 315201
Corrosion Behavior of Pipeline Steel X65 in Oilfield
Shuan LIU1,2,Xia ZHAO1(),Changwei CHEN1,Baorong HOU1,Jianmin CHEN2
1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2. Key Laboratory of Marine Materials and Related Ningbo Technologies, Institute of Materials Technologies and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
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摘要: 

研究了胜利埕岛油田用X65管线钢的管内腐蚀和管外腐蚀行为。通过失重法和电化学测试手段研究了油田中油水混合物流速和油含量对X65钢输油管线钢管内腐蚀行为的影响规律。采用动电位极化曲线和电化学阻抗谱研究了X65钢在土壤渗出液中的管外腐蚀行为,并结合X射线衍射技术 (XRD) 和扫描电镜 (SEM) 技术对X65钢腐蚀产物的晶型和形貌进行了分析。结果表明：X65钢的腐蚀速率随油水混合物流速的增加而增大,当油含量为5% (质量分数) 时,其腐蚀速率最大；X65钢在土壤渗出液中的自腐蚀电流密度随浸泡时间的延长而增大,表面生成的疏松腐蚀产物膜会加速阴极去极化反应。
关键词 ： X65管线钢,  腐蚀行为,  土壤渗出液,  流速,  油含量    
Abstract：

The inner- and outer-surface corrosion behavior of X65 pipeline steel used in Shengli Chengdao oilfield was studied in this paper. The inner surface corrosion behavior of X65 pipeline steel in oil-water mixtures with different flow rate and oil content was examined by means of mass loss method and electrochemical technique. The corrosion resistance of the outer surface of X65 pipeline steel in soil extracts was also examined by means of polarization curves and electrochemical impedance spectroscopy (EIS). The phase constituents and surface morphology of corrosion products were characterized by using X-ray diffraction techniques (XRD) and scanning electron microscopy (SEM), respectively. The results indicated that the corrosion rate of X65 steel increased with the increasing flow rate of oil-water mixture, which could reach the maximum value when the oil content was 0.5% (mass fraction). The corrosion current density of X65 steel increased with immersion time in soil extracts. A loose corrosion product film formed on the steel surface, which can accelerate the cathodic depolarization reaction.
Key words： X65 pipeline steel    corrosion behavior    soil extract    velocity    oil content
    
ZTFLH:     
基金资助:国家科技支撑重点项目 (2012BAB15B01) 和中国科学院海洋新材料与应用技术重点实验开放基金项目 (LMMT-KFKT-2014-008) 资助
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刘栓
赵霞
陈长伟
侯保荣
陈建敏

引用本文:

刘栓, 赵霞, 陈长伟, 侯保荣, 陈建敏. 油田输油管线钢X65的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(5): 393-399.
Shuan LIU, Xia ZHAO, Changwei CHEN, Baorong HOU, Jianmin CHEN. Corrosion Behavior of Pipeline Steel X65 in Oilfield. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 393-399.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.196      或      https://www.jcscp.org/CN/Y2015/V35/I5/393

图1  腐蚀实验装置图
图2  不同油含量和流速对X65钢腐蚀速率的影响
图3  不同油相质量分数的乳状液在X65钢表面的吸附形貌
图4  X65钢在不同油含量溶液中浸泡2 d后的Tafel极化曲线
图5  X65钢在土壤浸出液中浸泡不同时间的EIS谱
图6  X65钢在土壤浸出液中浸泡不同时间的等效电路图
Time / d Rs / Ωcm2 Qf / μFcm-2 n1 Rf / Ωcm2 Qdl / μFcm-2 n2 Rct / Ωcm2
1 1.01 --- --- --- 501.2 0.84 1943.8
3 1.45 --- --- --- 421.5 0.87 1627.2
7 1.62 --- --- --- 351.2 0.84 1214.3
10 1.36 --- --- --- 346.2 0.86 1108.4
14 1.91 6.91 0.83 17.2 127.1 0.76 1026.1
21 1.49 3.22 0.96 35.2 114.1 0.97 923.2
24 1.56 5.65 0.84 64.5 105.5 0.84 856.3
28 1.05 2.88 0.96 85.8 258.3 0.93 693.6
表1  X65钢在土壤浸出液中浸泡不同时间的EIS拟合数据
图7  X65钢在土壤浸出液中浸泡不同时间的Tafel极化曲线
Time d Ecorr V (vs SCE) Icorr μAcm-2 βc mVdec-1 βa mVdec-1
2 -0.725 8.65 -331.9 68.3
7 -0.732 11.50 -281.3 74.9
14 -0.796 39.30 -151.7 83.7
28 -0.813 76.30 -96.8 95.4
表2  X65钢在土壤浸出液中浸泡不同时间的Tafel拟合数据
图8  X65钢在土壤浸出液中浸泡不同时间的XRD谱
图9  X65钢在土壤浸出液中浸泡不同时间表面形貌的SEM像
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