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中国腐蚀与防护学报  2017, Vol. 37 Issue (3): 221-226    DOI: 10.11902/1005.4537.2016.018
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原油与高压CO2共存条件下咪唑啉缓蚀剂的作用行为研究
韩帅豪1,岑宏宇1,陈振宇1,2(),邱于兵2,郭兴蓬1,2
1 华中科技大学化学与化工学院 材料化学与服役失效湖北省重点实验室 武汉 430074
2 华中科技大学化学与化工学院 能量转换与存储材料化学教育部重点实验室 武汉 430074
Inhibition Behavior of Imidazoline Inhibitor in Corrosive Medium Containing Crude Oil and High-Pressure CO2
Shuaihao HAN1,Hongyu CEN1,Zhenyu CHEN1,2(),Yubing QIU2,Xingpeng GUO1,2
1 Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, China
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摘要 

采用动态失重挂片、高温高压电化学测试、接触角测试及扫描电镜等手段,在80 ℃、2.5 MPa CO2条件下模拟饱和CO2油田采出水,研究原油与高压CO2共存条件下咪唑啉缓蚀剂对N80钢的缓蚀作用。结果表明:在含有咪唑啉缓蚀剂的腐蚀介质中加入原油后,电极的开路电位有所增加,电极的电荷传递电阻显著变大,碳钢对水的润湿性明显降低,缓蚀剂在金属表面覆盖更完整,原油显著增强了咪唑啉缓蚀剂的缓蚀性能。

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韩帅豪
岑宏宇
陈振宇
邱于兵
郭兴蓬
关键词:  CO2腐蚀  咪唑啉缓蚀剂  N80钢  原油    
Abstract: 

Effect of crude oil on the inhibition behavior of imidazoline inhibitor were illustrated by dynamic mass loss method, electrochemical test, contact angle measurement, scanning electron microscopy etc. The oilfield produced water was simulated in the presence of CO2 under pressure of 2.5 MPa at 80 ℃, then in the above corrosive medium the corrosion inhibition performance of imidazoline corrosion inhibitor for N80 steel was assessed. The results showed that the open circuit potential and charge transfer resistance of the carbon steel increased when adding crude oil into the corrosive medium which contained imidazoline corrosion inhibitor. It is also found that the wettability of carbon steel surface against water was reduced obviously and the coverage of the inhibitor film became more complete, whilst the inhibition efficiency increased greatly after introducing crude oil into the oilfield produced water.

Key words:  CO2 corrosion    imidazoline corrosion inhibitor    N80 steel    crude oil
收稿日期:  2016-01-25                出版日期:  2017-07-04      发布日期:  2017-07-04      期的出版日期:  2017-07-04
基金资助: 国家自然科学基金 (51571098)
引用本文:    
韩帅豪,岑宏宇,陈振宇,邱于兵,郭兴蓬. 原油与高压CO2共存条件下咪唑啉缓蚀剂的作用行为研究[J]. 中国腐蚀与防护学报, 2017, 37(3): 221-226.
Shuaihao HAN,Hongyu CEN,Zhenyu CHEN,Yubing QIU,Xingpeng GUO. Inhibition Behavior of Imidazoline Inhibitor in Corrosive Medium Containing Crude Oil and High-Pressure CO2. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 221-226.
链接本文:  
http://www.jcscp.org/CN/10.11902/1005.4537.2016.018  或          http://www.jcscp.org/CN/Y2017/V37/I3/221
Condition CO2 pressureMPa Corrosion ratemma-1
Imidazoline only 0.5 0.151
1.5 0.237
2.5 0.299
Imidazoline+crude oil 0.5 0.041
1.5 0.052
2.5 0.072
表1  在不同CO2分压下N80钢的失重实验结果 (80 ℃)
Condition Temperature℃ Corrosion rate mma-1
Imidazoline only 40 0.172
60 0.251
80 0.299
Imidazoline+crude oil 40 0.055
60 0.062
80 0.072
表2  在不同温度下N80钢的失重实验结果 (2.5 MPa)
图1  在不同条件下N80钢的极化曲线 (80 ℃, 2.5 MPa)
Condition Ecorr
mV
Icorr
mAcm-2
ba
mVdec-1
bc
mVdec-1
η
%
Blank -701 3.74 175.69 343.66 ---
Crude oil -689 3.08 162.46 268.58 17.6
Imidazoline -667 0.23 89.64 213.04 93.8
Imidazoline+crude oil -644 0.05 60.98 237.96 98.7
表3  从图1中的极化曲线计算得到的电化学参数 (80 ℃, 2.5 MPa)
图2  在不同条件下N80钢的电化学阻抗谱 (80 ℃, 2.5 MPa)
图3  电化学阻抗谱等效电路模型
Condition RsΩcm2 CPEct-T
mFcm-2
CPEct-P Rct
Ωcm2
RL
Ωcm2
L
Hcm2
CPEf-T
mFcm-2
CPEf-P Rf
Ωcm2
Blank 2.876 1.5984 0.89 11.42 33.09 156.2 --- --- ---
Crude oil 3.275 1.6041 0.87 14.79 45.97 179.2 --- --- ---
Imidazoline 3.35 0.270 0.85 289.1 --- --- 7.97 0.73 116.5
Imidazoline+crude oil 4.48 0.213 0.80 421.7 --- --- 7.87 0.77 223.6
表4  N80钢的电化学阻抗谱拟合结果
图4  在不同条件下N80钢表面水滴的形貌图
图5  在不同条件下N80钢的腐蚀形貌 (80 ℃, 2.5 MPa)
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