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中国腐蚀与防护学报  2017, Vol. 37 Issue (3): 300-304    DOI: 10.11902/1005.4537.2016.151
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L245钢在不同温度下的油气田模拟水中的腐蚀行为研究
朱明(),余勇,张慧慧
西安科技大学材料科学与工程学院 西安 710054
Corrosion Behavior of L245 Steel in Simulated Oilfield Produced Water at Different Temperatures
Ming ZHU(),Yong YU,Huihui ZHANG
College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
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摘要 

采用浸泡失重法、动电位极化曲线和电化学阻抗技术研究了L245钢在不同温度下的油气田模拟水中的腐蚀行为,采用SEM分析了腐蚀产物的表面形貌。结果表明:在饱和CO2条件的溶液中,当温度从30 ℃升高至90 ℃时L245钢的腐蚀电流从66.1 μAcm-2升高到177 μAcm-2,说明L245钢在高温下反应比较剧烈。当温度从30 ℃升高至90 ℃时L245钢的电荷转移电阻从5155 Ωcm2减小到1182 Ωcm2,说明温度的升高减小了腐蚀反应的阻力。以上结果表明,在30~90 ℃时L245钢在油气田模拟水中的腐蚀速率随着温度的升高而加快,当温度升高至60 ℃时开始发生局部腐蚀并随着温度升高而加剧。

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朱明
余勇
张慧慧
关键词:  L245钢  油田模拟水  温度  腐蚀速率    
Abstract: 

The corrosion behavior of L245 steel in simulated oilfield produced water was investigated by means of weight loss measurement, polarization curve measurement, electrochemical impedance spectra (EIS) and SEM. The results showed that the corrosion reaction of L245 steel is more intensive at higher temperature. When the temperature of the solution is elevated from 30 ℃ to 90 ℃, the corrosion current density of L245 steel in the solution with saturated CO2 increases from 66.1 μAcm-2 to 177 μAcm-2 while the charge transfer resistance of L245 steel decreased from 5155 Ωcm2 to 1182 Ωcm2. The above results indicated that the corrosivity of oilfield produced water increased with the increasing temperature within the range of 30~90 ℃, localized corrosion of the steel occurred at 60 ℃, then the localized corrosion would be intensified when the temperature is elevated to 90 ℃.

Key words:  L245 steel    simulated oilfield water    temperature    corrosion rate
收稿日期:  2016-09-09                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(51201131),西安科技大学培育基金(6310214005)和西安科技大学博士启动金(6310115012)
引用本文:    
朱明,余勇,张慧慧. L245钢在不同温度下的油气田模拟水中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2017, 37(3): 300-304.
Ming ZHU,Yong YU,Huihui ZHANG. Corrosion Behavior of L245 Steel in Simulated Oilfield Produced Water at Different Temperatures. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 300-304.
链接本文:  
http://www.jcscp.org/CN/10.11902/1005.4537.2016.151  或          http://www.jcscp.org/CN/Y2017/V37/I3/300
图1  L245钢在不同温度油气田模拟采出水中浸泡10 d后的腐蚀速率
图2  L245钢在不同温度油气田模拟水中的动电位极化曲线
图3  L245钢在不同温度的油气田模拟水中的Nyquist图和Bode图
图4  L245钢在不同温度的油气田模拟水中电化学阻抗等效拟合电路
T / ℃ ba / mVdec-1 bc / mVdec-1 Ecorr / mV Icorr / μAcm-2
30 160.5 117.5 -807.3 61.1
60 149.4 57.5 -757.3 95.2
90 145.5 54.1 -741.6 177
表1  L245钢在不同温度的油气田采出水中极化曲线拟合结果
T / ℃ Rs / Ωcm2 Cd / μFcm-2 Rt / Ωcm2 Q / μFcm-2(n) Rf / Ωcm2
30 5.6 81 5155 207.5(0.83) 35.1
60 4.1 121 2891 398.5(0.68) 65.3
90 3.5 141 1182 468.9(0.57) 80.5
表2  L245钢在模拟油田采出水中不同温度下电化学阻抗拟合所得电化学参数
图5  L245钢在不同温度的模拟油田采出水中浸泡10 d后的腐蚀形貌
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