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The influence of water pollution and welding defects on MIC(rnicrobiologically 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 while the OCP of those samples in water without bacteria was kept at a low level.The OCP decreased dramatically when MIC started in polluted water.Combination of weld defect-heat tint,polluted water and adding bacteria causes MIC happen at high rate.Some elements inside the tubercle were analyzed with EDXA.The pits and biofilm were observed with SEM.Microbiological analysis revealed the difference of bacteria between corroded and uncorroded samples.
The influence of water pollution and welding defects on MIC (rnicrobiologically influenced corrosion) was studied. 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 while the OCP of those samples in water without bacteria was kept at a low level. The OCP decreased dramatically when MIC started in polluted water. Combining of weld defect-heat tint, polluted water and adding bacteria causes MIC happen at high rate. Home elements inside the tubercle were analyzed with EDXA.The pits and biofilm were observed with SEM. Microbiological analysis revealed the difference of bacteria between corroded and uncorroded samples.