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| Corrosion Behavior of X100 Pipeline Steel in Simulated Solution of Alkaline Soil |
ZHANG Xiuyun, SHI Zhiqiang( ), WANG Yanfang, LIU Mingxing, YANG Shengsheng |
| Department of Materials Science and Engineering, China University of Petroleum (Huadong), Qingdao 266580, China |
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Abstract The corrosion behavior of X100 pipeline steel in an artificial solution which aims to simulate the alkaline soil medium at Korla area of Xinjiang were investigated by weight-loss, electrochemical measurement, scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) and X-ray diffractomater (XRD). Results show that the corrosion behavior of X100 pipeline steel in the simulated solution is a typical active dissolution corrosion. The corrosion tendency gradually increases with time. The average corrosion rate and the instantaneous corrosion rate all increase first, then decrease and increase again finally. The corrosion products exhibit a three layered structure composed of a surface layer of loosened brown red γ-FeOOH, a middle layer of black loosened Fe3O4 and FeS and an inner layer of dense black Fe3O4 and FeS. It is also found that Cl- plays an important role in X100 steel corrosion, and a small amount of SO42- is also involved in the reaction which has certain influence on the corrosion.
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