Ni-WS_(2)复合镀层提高X100管线钢在油田采出水中耐蚀性的研究

Study on improvement of corrosion resistance of X100 pipeline steel in produced water of oil field by electroplating Ni-WS_(2) composite coating

为了提高X100管线钢的耐蚀性,在其表面进行Ni-WS_(2)复合电镀。考察了电镀前后X100钢在60℃的饱和CO_(2)模拟油田采出水中浸泡24 h内的腐蚀行为。通过扫描电子显微镜(SEM)观察了镀层腐蚀前后的表面形貌及厚度,通过X射线衍射仪(XRD)分析了镀层腐蚀前后的相组成,通过动电位极化曲线(PDP)和电化学阻抗谱(EIS)测试了有无镀层的X100管线钢的耐蚀性。结果表明:Ni-WS_(2)复合镀层被腐蚀后表面依旧均匀、致密,腐蚀产物主要由Fe3C和FeOOH组成。有Ni-WS_(2)镀层的X100管线钢浸泡在饱和CO_(2)油田采出水中24 h内表现出比基体更强的耐腐蚀性能。

Ni-WS_(2) composite coating was electroplated on the surface of X100 pipeline steel to improve its corrosion resistance.The corrosion behaviors of X100 pipeline steel before and after being immersed in artificial oilfield produced water saturated with CO_(2) at 60℃ within 24 hours were studied.The surface morphology and thickness of the composite coating before and after corrosion were observed using scanning electron microscope(SEM),and its phase structure was analyzed using X-ray diffractometer(XRD).The corrosion resistance of X100 pipeline steel with and without Ni-WS_(2) composite coating was tested by potentiodynamic polarization(PDP)measurement and electrochemical impedance spectroscopy(EIS).The results showed that the surface of Ni-WS_(2) composite coating was still compact and uniform after corrosion,and the corrosion products were mainly Fe3C and FeOOH.The X100 pipeline steel with a Ni-WS_(2) composite coating showed better corrosion resistance than the blank substrate in oilfield produced water saturated with CO_(2) within 24 hours.