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实验模拟了油、气集输过程碳钢管线中的流体环境,在不同流体速度、温度及成膜时间下,通过EIS技术考察45号钢表面附着缓蚀剂膜的耐腐蚀性能及破坏过程。缓蚀剂膜的腐蚀破坏过程中,EIS监测获得典型的电化学阻抗谱。结果表明,随着腐蚀时间、流体流速与流体温度的增加,碳钢表面附着缓蚀剂膜层由厚变薄,由致密变疏松,并表现出多孔性。因此,流体通过导致的表面剪切作用与气泡冲击,降低了该缓蚀剂的性能表现。通过SEM方法,辅助评价了处于不同状态下的缓蚀剂膜的结构。
The fluid environment in carbon steel pipeline of oil and gas gathering and transportation was simulated experimentally. The corrosion resistance and failure process of corrosion inhibitor film on the surface of No.4 steel were investigated by EIS technology under different fluid velocity, temperature and film forming time. During the corrosive destruction of the corrosion inhibitor film, a typical electrochemical impedance spectroscopy was obtained by EIS monitoring. The results show that with the increase of corrosion time, fluid flow rate and fluid temperature, the corrosion inhibitor film attached to the surface of carbon steel becomes thinner and thicker, loose and porous. As a result, the fluid impacts the bubble through the resulting surface shear and reduces the performance of the inhibitor. The SEM method was used to evaluate the structure of corrosion inhibitor membrane in different states.