Investigation of Sulfate-Reducing Bacteria on Pitting of 316L Stainless Steel in Cooling Water System for oil refinery

J Chin Soc Corr Pro

2007, Vol. 27

Issue (1): 48-53 DOI:

Research Report

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Investigation of Sulfate-Reducing Bacteria on Pitting of 316L Stainless Steel in Cooling Water System for oil refinery

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西安交通大学

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;. Investigation of Sulfate-Reducing Bacteria on Pitting of 316L Stainless Steel in Cooling Water System for oil refinery. J Chin Soc Corr Pro, 2007, 27(1): 48-53 .

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Abstract Microbiological induced pitting corrosion on 316L stainless steel used in water cooling system for oil refinery was analyzed,the electrochemical features on pitting of stainless steel in sulphate-reducing bacteria (SRB)media were investigated by using of open circuit potential measure、potentiodynamic scanning、electrochemical impedance spectrum (EIS)and scanning electron microscopy(SEM).With prolonging the immersion time,the corrosion potentia l and pitting potential decreased,and polarization resistance (Rp)decreased as well.The corrosion rate of 316L SS in SRB medium is larger than those in sterile medium.The experimental results showed that the metabolic activity of SRB influenced the corrosion process,increased the corrosion damage degree of the passive film,accelerated the corrosion rate of 316L SS with the increase of immersion time.

Key words: Sulphate-Reducing Bacteria ( SRB) 316L stainless steel pitting corrosion electrochemical features

Received: 29 August 2005

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TG172.7

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2007/V27/I1/48

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