Corrosion Resistance of 20# and L245NS Pipeline Steels in Low-Sulfur Oilfield Environment
摘 要
通过动电位极化曲线和电化学阻抗谱,分析了20号和L245NS管线钢在模拟不含硫和H2S/CO2共存的低含硫油田环境中的腐蚀行为,采用扫描电镜和能谱仪分析了其表面腐蚀产物的微观形貌和成分。结果表明:20号和L245NS管线钢在低含硫油田环境中的腐蚀电位(Ecorr)变化较小,腐蚀电流密度(Jcorr)显著减小,相同条件下L245NS管线钢的Jcorr比20号管线钢的略小;20号和L245NS管线钢在不含硫油田环境中的电化学阻抗谱均呈中高频区容抗弧和低频区感抗弧的时间常数特征,在低含硫油田环境中低频区感抗特征消失;L245NS管线钢在低含硫油田环境中的耐蚀性比20号管线钢的略好。
Abstract
The corrosion behavior of 20# and L245NS pipeline steels in simulated sulfur-free and low-sulfur oilfield environment with coexistence of H2S/CO2 was analyzed by potentiodynamic polarization curves and electrochemical impedance spectroscopy. Scanning electron microscope and energy dispersive spectrometer were used to analyze the micro morphology and composition of corrosion products on the surface. The results showed that the corrosion potential (Ecorr) of 20# and L245NS pipeline steels in low-sulfur oilfield environment had a small change, and the corrosion current density (Jcorr) was significantly reduced. Under the same conditions, the Jcorr of the L245NS pipeline steel was slightly smaller than that of 20# pipeline steel. The electrochemical impedance spectra of 20# and L245NS pipeline steels in sulfur-free oil field environment showed the time constant characteristics of capacitive reactance arc in the medium and high frequency region and inductive reactance arc in the low frequency region. The inductive reactance characteristics in low frequency region in low-sulfur oilfield environment disappeared. The corrosion resistance of L245NS pipeline steel in low-sulfur oilfield environment was slightly better than that of 20# pipeline steel.
中图分类号 TG174 DOI 10.11973/fsyfh-202209009
所属栏目 试验研究
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收稿日期 2020/9/18
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引用该论文: ZHOU Pei,LI Qiongwei,YIN Zhifu,LIU Xiaoqing. Corrosion Resistance of 20# and L245NS Pipeline Steels in Low-Sulfur Oilfield Environment[J]. Corrosion & Protection, 2022, 43(9): 46
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参考文献
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【3】孟江,赵学芬,高修钦,等.含H2S气田污水对20钢的腐蚀研究[J].焊管,2014,37(10):16-19.
【4】刘博,任呈强,贺三,等. 20钢和L245NS钢在CO2驱油反排水中的腐蚀行为[J].腐蚀与防护,2018,39(6):418-424.
【5】廖柯熹,周飞龙,何国玺,等.流动条件下20钢在H2S/CO2共存体系中的腐蚀行为及预测模型研究[J].材料保护,2019,52(7):29-36.
【6】胡建国,张志浩,孙银娟.油田二氧化碳驱20#和L245NS管线钢腐蚀规律研究[J].油气田地面工程,2017,36(9):18-23.
【7】KAHYARIAN A,NESIC S. H2S corrosion of mild steel:a quantitative analysis of the mechanism of the cathodic reaction[J]. Electrochimica Acta,2019,297:676-684.
【8】SUN W, NESIC S. A mechanistic model of H2S corrosion of mild steel[C]//Corrosion 2007.Houston,Texas,NACE:2007.
【9】VELOZ M A,GONZÁLEZ I. Electrochemical study of carbon steel corrosion in buffered acetic acid solutions with chlorides and H2S[J]. Electrochimica Acta,2002,48(2):135-144.
【10】AGARWAL D,KLOEWER J. Nickel base alloys:corrosion challenges in the new millennium[C]//Corrosion 2001.Houston,Texas,NACE:2001.
【11】FRIEND W Z, COHEN M. Corrosion of nickel and nickel-base alloys[J]. Journal of the Electrochemical Society,1980,127(8):421C.
【12】SILVERMAN D C,CARRIÇO J E. Electrochemical impedance technique-A practical tool for corrosion prediction[J]. Corrosion,1988,44:280-287.
【13】JVTTNER K. Electrochemical impedance spectroscopy (EIS) of corrosion processes on inhomogeneous surfaces[J]. Electrochimica Acta,1990,35(10):1501-1508.
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