Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
The Effect of Sulfate-reducing Bacteria on Corrosion Behavior of Ductile Cast Iron in Liquid Medium
Fumio Kajiyama
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1997 Volume 46 Issue 8 Pages 510-514

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Abstract

This paper describes the effect of hydrogenase-positive sulfate-reducing bacteria (Desulfovibrio desulfuricans) on corrosion behavior of ductile cast iron in Postgate's medium B using electrochemical techniques such as corrosion potential, AC impedance, and polarization measurements. Uniform corrosion rate remained as low as 2.5×10-13m·s-1 presumably due to the adherent iron sulfide layer formed by the action of sulfate-reducing bacteria. Polarization behavior of ductile cast iron under actively-growing Desulfovibrio desulfuricans does not coincide with corrosion rate. Therefore, catholic depolarization is not directly related to an increrase in corrosion rate.

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© Japan Society of Corrosion Engineering
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