X80钢表面Ni涂层在饱和CO2模拟海水中的耐蚀性能

Corrosion Resistance of Ni Coating on X80 Steel Surface in Simulated Seawater with Saturated CO

为了提高X80管线钢在含CO2海水环境中的耐蚀性,采用电化学脉冲沉积法在X80管线钢表面电镀不同占空比的Ni涂层,研究了X80基体和占空比分别为50%、80%和100%的镀Ni涂层在饱和CO2模拟海水中浸泡2 h和12 h的腐蚀规律。采用电化学方法、金相显微镜、扫描电子显微镜(SEM)和X射线衍射仪(XRD)分别对X80基体及其表面上不同占空比Ni涂层的耐蚀性能、微观形貌和结构进行测试评价。结果表明:通过在基体表面镀Ni涂层可以有效控制腐蚀,并且占空比100%的镀Ni涂层的耐蚀性最高。XRD结果表明,CO2模拟海水环境中主要腐蚀生成物有Fe3C、FeCO3及FeOOH。对比分析试验结果对解决X80在含CO2海水环境中的腐蚀问题并提出相应的防腐蚀措施有一定的借鉴与指导作用。

In order to improve the corrosion resistance of X80 pipeline steel in seawater with saturated CO2 environment,the electrochemical pulse deposition method was used to electroplate Ni coating on the surface of X80 pipeline steel. The corrosive laws of the X80 substrate and the Ni coatings prepared with duty ratios of 50%,80% and 100% were studied by immersing treatment in simulated seawater with saturated CO2 for 2 h and 12 h,respectively. In addition,the corrosion resistance of Ni coatings and the substate was evaluated by using the electrochemical method,and the morphology and composition were carried out by metallographic microscope,scanning electron microscope(SEM) and X-ray diffractometer(XRD). Results showed that the Ni coating on the substrate surface could effectively suppress corrosion,and the Ni coating prepared with the duty cycle of 100% had the highest corrosion resistance. Furthermore,XRD results showed that the main corrosion products were Fe3C,FeCO3 and FeOOH. Comparison and analysis of the experimental results could have a certain effect for providing reference and guidance to solve the corrosion problems encountered by X80 in seawater with saturated CO2.