摘要
天然气开发生产中常有H_(2)S、CO_(2)共存,引起生产油管严重腐蚀,为了研究H_(2)S/CO_(2)腐蚀环境中不同含硫量对80S和80S-3Cr 2种抗硫油管材料抗腐蚀性能的影响,通过动电位极化扫描和电化学交流阻抗测试研究了2种材料的电化学腐蚀行为。研究结果表明:(1)2种材料的极化曲线均随含硫量增大向X轴负向移动,阴极反应由活化和扩散作用联合控制,当Na 2 S·9H 2 O浓度达到1.0%时极化曲线的阳极分支出现了钝化区;(2)2种材料的腐蚀电位E corr均随含硫浓度增大而负向增大,其腐蚀电流密度J corr减小,各相应条件下80S-3Cr的J corr相比80S更小;(3)含硫条件下Nyquist谱具有中高频区容抗弧和低频区Warburg阻抗的2个时间常数,且Warburg阻抗特征随含硫浓度增大而更明显;(4)随含硫浓度增大,电荷传递电阻R t不断增大,而Warburg阻抗Z w减小;(5)基体表面先形成的腐蚀产物中的S元素含量更高,80S-3Cr的腐蚀产物与80S相比S元素含量更低。综合可知:H_(2)S、CO_(2)共存腐蚀环境中在金属表面优先形成了具有保护性的硫化铁类产物,抑制了金属材料的腐蚀,同时80S-3Cr材料与80S材料相比具有更好的抗H_(2)S/CO_(2)腐蚀性能。
In the natural gas development and production,the co-existence of H2 S and CO2 would cause serious corrosion of production tubing steels.The electrochemical corrosion behavior of 80 S and 80 S-3 Cr anti-sulfur tubing materials were investigated in H2 S/CO2 corrosion environment at different sulfur-containing contents by potentiodynamic polarization scanning and electrochemical impedance spectroscopy.And the following research results were obtained.First,polarization curves of the two materials moved in negative X-axis direction with the increase of sulfur-containing content,the cathode reactions were combined controlled by activation and diffusion processes,and the passivation zones appeared in the anode branches of polarization curves when the Na2 S·9 H2 O concentration beyond 1.0%.Second,the potential(Ecorr) increases negatively with increasing sulfur-containing content,and the corrosion current density(Jcorr) decreases,and the Jcorr vaule of 80 S-3 Cr was smaller than the one of 80 S under each corresponding testing condition.Third,there existed two time constants including resistance arc in medium-high frequency zone and Warburg impedance in low-frequency zone in sulfur-containing conditions,and characterization of Warburg Abstract:In the natural gas development and production,the co-existence of H2 S and CO2 would cause serious corrosion of production tubing.In order to analyze the effects of the sulfur-containing contents on the corrosion resistance of 80 S and 80 S-3 Cr anti-sulfur tubing materials in H2 S/CO2 corrosion environment,the electrochemical corrosion behaviors of the two materials were measured by potentiodynamic polarization scanning and electrochemical impedance spectroscopy.The following research results were obtained:(1) the polarization curves of the two materials moved in negative X-axis direction with the increase of sulfur-containing content,and the cathode reactions were combined controlled by activation and diffusion processes.The passivation zones appeared in the anode branches of po
作者
戚建晶
何淼
尹志福
惠浩源
QI Jian-jing;HE Miao;YIN Zhi-fu;HUI Hao-yuan(National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi’an 710018,China;Oil&Gas Technology Research Institute,Changqing Oilfield Company,Xi’an 710018,China;School of Mechanical and Material Engineering,Xi’an University,Xi’an 710065,China;Shaanxi Key Laboratory of Surface Engineering and Remanufacturing,Xi’an 710065,China)
出处
《材料保护》
CAS
CSCD
2021年第7期63-68,78,共7页
Materials Protection
基金
中国石油天然气股份有限公司科技项目《泡沫辅助减氧空气驱防腐防窜工艺技术研究》(201905-5-3)资助。
