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Influence of Sulfur Deposition on Corrosion Behavior of Carbon Steel L360 Covered with FeS- or FeCO3-film |
Qiuyan SHEN,Hongfang LIU,Liewei LIU( ) |
School of Chemistry and Chemical Engineering, Institute of Materials and Environmental Chemistry,Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract A FeCO3 film and FeS film were prepared on carbon steel L360 by anodic electrolyzing the steel in NaHCO3 solution and immersing the steel in Na2S solution respectively in air at 80 ℃. Then, the corrosion performance of the steel covered with the two films beneath sulfur-deposition in an artificial formation water was studied by means of electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and environmental scanning electron microscope (ESEM). The results indicated that for the case without S deposits, the two films showed good protectiveness in the artificial solutions with pH 7 and 3 respectively, and the FeCO3 film was better than the FeS film. The two films were better in the neutral solution than in acidic solution. However, for the case with S deposits, the two films loosed their protectiveness in the two solutions. Moreover, in the solution with pH 7, the steel beneath FeCO3 film suffered from local corrosion seriously, while the steel beneath FeS film suffered from uniform corrosion. Besides, in the solution with pH 3, the steels with or without films all suffered from uniform corrosion.
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