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Effect of Corrosion Product Film Formed in Artificial Solution Simulated Soil Medium at Ku'erle Area onPitting Corrosion Behavior of X80 Pipeline Steel |
Di ZHANG1,Ping LIANG1(),Yunxia ZHANG2,Yanhua SHI1,Hua QIN1 |
1. School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China 2. Continual Education Institute, Liaoning Shihua University, Fushun 113001, China |
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Abstract The evolution of corrosion product film formed on X80 pipeline steel in artificial solution,which simulate the soil medium at Ku'erle area, with different immersion time was studied by immersion tests, while the morphology and phase constituent of the corrosion product film was characterized by means of scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. The effect of corrosion product film on the pitting corrosion of X80 pipeline steel was investigated by cyclic polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results showed that the thickness and compactness of corrosion product film gradually increased with increasing immersion time. After immersion for 168 h, the corrosion product film was clearly divided into two layers. The pitting of X80 pipeline steel may be hindered or inhibited by the corrosion product film, which may reduce the probability of pitting initiation, and increase the resistance to pitting growth.
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