Influence of the sulphate reducing bacteria on API-X70 steel corrosion

The corrosion behaviour of API X70 immersed in a specific medium with a strain of thermophilic sulphate reducing bacteria (SRB) was analysed. Anaerobic corrosion test was carry out for 32 days at 50 °C. During the exposure time, pH, sulphate (SO 42−) and hydrogen sulphide (H2S) concentration were me...

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Bibliographic Details
Published in:Materials and corrosion 2009-12, Vol.60 (12), p.982-986
Main Authors: Rodriguez-Hernandez, M., Galvan-Martinez, R., Orozco-Cruz, R., Martinez, E. A., Torres-Sanchez, R.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Hydrogen sulfide
linear polarization resistance
Metals. Metallurgy
MIC
pH effects
Polarization
polarization curve
Scanning electron microscopy
SRB
Steel
Thermophilic bacteria
X70 steel
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Summary:The corrosion behaviour of API X70 immersed in a specific medium with a strain of thermophilic sulphate reducing bacteria (SRB) was analysed. Anaerobic corrosion test was carry out for 32 days at 50 °C. During the exposure time, pH, sulphate (SO 42−) and hydrogen sulphide (H2S) concentration were measured. Corrosion potential, linear polarization resistance and potentiodynamic polarization curve were used in order to get the influence of the SRB in the corrosion phenomenon. Scanning electron microscopy was used to determine corrosion morphology. Results show that the SRB activity influenced the overall corrosion process. The anodic branches in the polarization curves show a passivity feature, whereas, the cathodic branches were not affected. A localized corrosion attack was found.
ISSN:0947-5117
1521-4176
1521-4176
DOI:10.1002/maco.200905221