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| Study of influence by sulfate-reducing bacteria on formation of corrosion products on the surface of Q235 steel |
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Abstract The formation of corrosion products on the surface of Q235 steel in seawater containing sulfate-reducing bacteria(SRB) was studied by scanning electronic microscopy(SEM), electronic probe microanalyzer(EPMA) and transmission electron microscopy(TEM) combined with energy dispersive X-ray detector(EDX) in this paper. SEM observation showed that the corrosion commenced with the attachment of bacteria to the steel surface, producing organic acids, hydrogen sulphide and extracellular polymer substances(EPS). Globules of hydrated ferric oxide were the primary form of corrosion products. With exposure to further deterioration caused by SRB, their transformation to spongy globules of iron sulphide was observed by EPMA. The presence of single crystal FeS in the corrosion products was identified by electronic diffraction pattern of TEM and composition analysis by EDX.
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Received: 17 January 2007
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