Abstract:
The influence of welding defects on MIC (microbiologically
influenced corrosion) was studied. The open circuit potential (OCP)
was measured during MIC test. It was found that OCP shifted to a
higher level when the system was inoculated with bacteria and it
decreased dramatically when MIC started. Among a series of
welding defects golden heat tint was found the most susceptible
to MIC. The tubercles over pitting were observed with SEM. Some
elements inside of the tubercles were analysed with EDXA.
Microbiological analysis of a corroded and a non-corroded sample
revealed no significant difference between them with the
exception of the number of the manganeseoxidising bacteria.
Key words: Microbiologically
influenced corrosion Stainless steel Weld
Manuscript received on August
21, 1997; revised manuscript September 20, 1997
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