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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (1): 79-86    DOI: 10.11902/1005.4537.2015.030
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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.

Key words:  FeCO3 film      FeS film      corrosion resistance      sulfur deposition     

Cite this article: 

Qiuyan SHEN,Hongfang LIU,Liewei LIU. Influence of Sulfur Deposition on Corrosion Behavior of Carbon Steel L360 Covered with FeS- or FeCO3-film. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 79-86.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2015.030     OR     https://www.jcscp.org/EN/Y2016/V36/I1/79

Fig.1  XRD pattern (a) and Raman spectrum (b) of the films formed duing electrolysis in NaHCO3 solution and immersion in Na2S solution, respectively
Fig.2  SEM images of FeCO3 film (a) and FeS film (b), cross-section microstructure of L360 steel with FeCO3 film (C) and EDS results of FeCO3 film (d) and FeS film (e)
Condition Acidity Corrosion rate / mma-1
Without film FeS film FeCO3 film
Without sulfur pH=7 0.24 0.13 0.09
pH=3 1.20 0.41 0.36
Sulfur deposition pH=7 22.37 22.19 20.97
pH=3 38.99 37.35 34.98
Table 1  Corrosion rates of L360 carbon steel immersed in simulated solutions
Fig.3  EIS Nyquist plots for L360 carbon steel immersed in simulated solutions: (a) sulfur free, pH=7; (b) sulfur deposition, pH=7; (c) sulfur free, pH=3; (d) sulfur deposition, pH=3
Fig.4  Equivalent circuits of impedance diagrams for EIS spectra of L360 carbon steel immersed in simulated solutions without film and with FeS film (a), with FeCO3 film, pH=3 (b) and with FeCO3 film, pH=7 (c)
Fig.5  Polarization curves of L360 carbon steel immersed in simulated solutions: (a) sulfur free, pH=7; (b) sulfur free, pH=3; (c) sulfur deposition, pH=7; (d) sulfur deposition, pH=3
Fig.6  Fitting results of polarization resistance Rp (a) and corrosion current density Icorr (b) of L360 carbon steel immersed in simulated solutions
Fig.7  SEM micrographs of the cross-section microstructure of L360 steel with FeCO3 film after immersion in solutions with pH=7 (a) and pH=3 (b)
Fig.8  Morphologies of L360 carbon steel after corrosion under sulfur deposition: (a) without film, pH=7; (b) FeS film, pH=7; (c) FeCO3 film, pH=7; (d) the edge of steel with FeCO3 film, pH=7; (e) without film, pH=3; (f) FeS film, pH=3; (g) FeCO3 film, pH=3; (h) the edge of steel with FeCO3 film, pH=3
Condition Rct / Ωcm2 Rf1 / Ωcm2 Rp / Ωcm2
Without film With FeS film With FeCO3 film Without film With FeS film With FeCO3 film Without film With FeS film With FeCO3 film
Without sulfur pH=7 186.70 258.90 392.60 31.31 52.29 77.62 218.01 311.19 470.22
Without sulfur pH=3 23.77 28.73 59.85 3.50 2.10 9.30 27.27 30.83 69.15
Sulfur deposition pH=7 3.26 3.44 5.56 1.43 1.61 1.95 4.69 5.06 7.51
Sulfur deposition pH=3 1.58 1.88 5.12 1.56 1.57 1.07 3.15 3.45 6.18
Table 2  Fitted values of Rct, Rf1 and Rp of EIS of L360 carbon steel immersed in simulated solutions
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