A Comparative Study of the Effects of Sulfate Reducing Bacteria on Corrosion of Carbon Steel Q235 under Simulated Disbonded Coating with Different Width of Aperture

Abstract:

The effect of sulfate reducing bacteria (SRB) on the corrosion of Q235 steel has been investigated in the crevice under the simulated disbonded coating with aperture width of 1.0 and 0.5mm in the soil-extract solutions (SES) by using electrochemical methods. The results show that the existence of SRB in SES can cause corrosion potential of the working electrode to shift to a more negative value, and the formation of pitting on the surface of the electrode. Compared with the crevice width of 1.0mm, the corrosion potential of the electrode shows a little more positive at the crevice width of 0.5mm. The corrosion rate of the electrode increases with the increase of aperture width in the SES without SRB, however, decreases with the increase of aperture width in the SES with SRB. The results obtained indicate that either bio-film on the surface of the electrode formed by SRB in SES or aperture width has obvious influences on the crevice corrosion process of the carbon steel.

• Periodical: Advanced Materials Research (Volumes 503-504)
• Pages: 247-250
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.503-504.247
• Online since: April 2012
• Authors: Ping Zhao, Jia Xing Yang, Peng Peng Zhu, Cheng Sun, Jin Xu
• Keywords: Corrosion Potential, Crevice Corrosion, EIS, Soil Leaching Solution

References

[1] Gan F, Sun Z W and Sabde G: Corrosion Vol. 50 (1994), p.804.

[2] Zhengfeng Li, Fuxing Gan and Xuhui Mao: Corrosion Science Vol. 44 (2002), p.689.

[3] Jin Xu, Kaixiong Wang, Cheng Sun, Fuhui Wang, Ximing Li, Jiaxing Yang and Changkun Yu: Corrosion Science Vol. 53 (2011), p.1554.

[4] Ping Zhao, Jiaxing Yang, Dunyong Du, Cheng Sun and Jin Xu: Advanced Materials Research Vols. 393-395 (2012), p.1541.

[5] S.Y. Li, Y.G. Kim, K.S. Jeon and Y.T. Kho: Met. Mater Vol. 6 (2000), p.281–286.