油田采出水中80S钢和N80钢的H_(2)S/CO_(2)电化学腐蚀行为研究  

Study on H_(2)S/CO_(2)Electrochemical Corrosion Behavior of 80S Steel and N80 Steel in Oilfield Produced Water

作　　者：宋蒲 王文珍[1] 贾新刚[1] SONG Pu;WANG Wenzhen;JIA Xingang(College of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China)

机构地区：[1]西安石油大学化学化工学院,陕西西安710065

出　　处：《西安石油大学学报(自然科学版)》2025年第1期130-136,共7页Journal of Xi’an Shiyou University(Natural Science Edition)

基　　金：国家自然科学基金(52073228,21901200)资助。

摘　　要：运用腐蚀失重和电化学测试技术研究80S钢和N80钢在含H 2S/CO_(2)的油田采出水中的电化学腐蚀行为。结果表明:在模拟CO_(2)/H_(2)S的腐蚀环境中,温度是影响腐蚀速率的一大因素,80S钢和N80钢的腐蚀速率随着温度的升高而增大。两种材料表面均发生均匀腐蚀,但N80钢表面的腐蚀程度更严重,主要是由于Cr元素可以显著提高腐蚀产物膜对金属的保护;两种材料的腐蚀电位均随着温度的升高而负移,腐蚀电流密度增大,在不同试验条件下80S钢的腐蚀电流密度均小于N80钢,表明80S钢比N80钢具有更好的抗腐蚀能力。两种材料在25℃时具有中高频区的容抗弧和低频区的感抗弧,在50℃和75℃时具有中高频区的容抗弧和低频区的Warburg阻抗,且Warburg阻抗随温度的升高表现出更明显的扩散特征。随着温度的升高,两种材料的电荷传递电阻R_(t)不断减小,Warburg阻抗的Z_(w)也减小,温度越高生成的腐蚀产物膜对金属表面的保护性能越好,80S钢比N80钢生成腐蚀产物膜的致密性更好。The electrochemical corrosion behaviors of 80S steel and N80 steel in oilfield produced water containing H_(2)S/CO_(2)were studied by corrosion weight loss and electrochemical measurement techniques.The results show that temperature is a major factor affecting the corrosion rate in the simulated CO_(2)/H_(2)S corrosion environment.The corrosion rate of 80S steel and N80 steel increases with the increase of temperature.Uniform corrosion occurs on the surface of both materials,but the corrosion degree on the surface of N80 steel is more serious,mainly because Cr can significantly improve the protection of the corrosion product film on the metal.With the increase of temperature,the corrosion potential of both materials changes to negative direction and the corrosion current density increases.Compared with N80 steel,the corrosion current density of 80S steel is lower under different conditions,and it has better corrosion resistance.The two materials have capacitive reactance arcs in the middle to high frequency region and inductive reactance arcs in the low frequency region at 25℃,and have capacitive reactance arcs in the middle to high frequency region and Warburg impedance in the low frequency region at 50℃and 75℃.Warburg impedance shows more obvious diffusion characteristics with the increase of temperature.With the increase of temperature,R_(t) of two materials decreases continuously,and Z_(w)of Warburg impedance also decreases.The higher the temperature,the better the protective performance of the corrosion product film generated on the metal surface,and the compactness of the corrosion product film generated on the surface of 80S steel is better than that on the surface of N80 steel.

关 键 词：80S钢 N80钢 H_(2)S/CO_(2)腐蚀 极化曲线 极化电阻 

分 类 号：TE980.5[石油与天然气工程—石油机械设备]