We have investigated the differences between the general corrosion and microbiological influenced corrosion (MIC) of a steel in terms of electrochemical behavior and surface phenomena. Corrosion potential of a steel in medium solution without SRB (Su...
We have investigated the differences between the general corrosion and microbiological influenced corrosion (MIC) of a steel in terms of electrochemical behavior and surface phenomena. Corrosion potential of a steel in medium solution without SRB (Sulphate Reducing Bacteria) shifted to a low direction continuously as a function of submerging time.
The potential caused by MIC with SRB shifted to a noble direction after 20days' incubation, indication the growth of SRB biofilm and the test metal specimens and a formation of corrosion product. In addition, the color of medium inoculated with SRB changed from grey to black., the color change was observed in the medium without SRB inoculation.
Moreover, corrosion rated of a steel in MIC were higher than those is the absence of SRB. This is probably because SRB caused be associated with the increasing corrosion rates through increasing cathodic reaction which caused the reducing sulfate to sulphide as well as formation of an oxygen concentration cell. The pitting corrosion was also observed in the of SRB inoculated medium.