MIC Behavior of the Low Alloy Steel with Different Zn-Epoxy Coating in SRB Solution

Abstract:

The microbiological influenced corrosion (MIC) behavior of the low alloy steel with granular-Zn-epoxy and flaky-Zn-epoxy coating in the sulfate-reducing bacteria (SRB) solution was investigated with electrochemical impedance spectroscopy (EIS), X-rays diffraction (XRD), scanning electron microscope (SEM) etc. Results show that the protection effect of the flaky-Zn coating specimen is much better than the granular-Zn coating one. The dissolution of zinc is more severe in granular-Zn coating than in flaky-Zn coating when the specimen immersed in the SRB solution. The shielding property of flaky zinc is much higher than granular zinc in the coating. The flaky-Zn coating is much more compact than the granular-Zn coating and therefore the property of anti-infiltration is much better. We may conclude that the flaky-Zn coating exhibited more favorable corrosion resistance property than the granular one.

• Periodical: Key Engineering Materials (Volumes 488-489)
• Pages: 262-265
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.488-489.262
• Online since: September 2011
• Authors: Jun Wang, Qing Fen Li, Yu Dong Fu, Chun Hui Li
• Keywords: Flaky-Zn-Epoxy Coating, Granular-Zn-Epoxy Coating, Microbiological Influenced Corrosion (MIC), Sulfate-Reducing Bacteria (SRB) Solution

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