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c.rrosion of High c.rbon Steel by Bac.eria under Aerobic.and Anaerobic.c.nditions

Materials Sc.enc.s and Applic.tions 2019年第3期10卷 227-242页

作者： R. c. Nwokorie c. O. Nweke S. I. Umeh F. c. Ihenetu O. R. Nlemolisa U. N. Kemka c. c. Obasi c. I. Nnadi K. H. Uzoho c. c. ejide Department of Mic.obiology Federal University of Technology Owerri Nigeria Department of Public.Health Imo State University Owerri Nigeria Department of Pathology Imo State University Teaching Hospital Orlu Nigeria

The role of mic.obes in the c.rrosion of metals is due to the c.emic.l ac.ivities (metabolism) assoc.ated with the mic.obial growth and reproduc.ion. A lot of researc.es have shown that enormous loss of resourc.s and even lives has been experienc.d in many c.untries of the world due to c.rrosion. There is therefore need to devic. a means of c.mbating this menac. so as to save different c.untries of the world inc.uding Nigeria the c.st enc.red due to c.rrosion. This researc. has helped to determine the role of bac.eria in the c.rrosion of high c.rbon steel under aerobic.and anaerobic.c.nditions was investigated using sulphate reduc.ng bac.eria and other aerobes. A sample of high c.rbon steel grade of c.emic.l c.mposition: 96% iron (Fe), 1.08% c.rbon (c., 0.349% silic.n (Si), 0.841% manganese (Mn), 0.005% phosphorus (P) and 0.005% sulphur (S), was obtained in the form of steel plate. Eighteen (18) samples of the high c.rbon steel were prepared. Standard mic.obiologic.l methods were used to isolate aerobic.and anaerobic.bac.eria isolates. The mic.obes isolated from the soil inc.uded;aerobes (Bac.llus spec.es, Pseudomonas spec.es) and anaerobes (Desulfovibrio spec.es, Thiobac.llus spec.es). The role of bac.eria in the c.rrosion of high c.rbon steel was estimated using the weight loss tec.nique and the elec.roc.emic.l potential measurement tec.nique. Eighteen samples of a high c.rbon steel of known c.mpositions were exposed to sulphate reduc.ng bac.eria under different environments (aerobic. anaerobic.and c.ntrol). The physic.l and c.emic.l c.anges were examined and monitored on weekly basis for six weeks. It was observed that the c.upons immersed in the media with sulphate reduc.ng bac.erium underwent fast ac.ivation and numerous c.rrosion sites were formed on the surfac.s. The average c.rrosion rate for six weeks (42 days) period of time as determined by the weight loss method and elec.roc.emic.l testing were found to be 0.0004595 mm/year, -0.712 mV in aerobic.environm

关键词： Bac.llus Spec.es Pseudomonas Spec.es Desulfovibrio Spec.es Thiobac.llus Spec.es c.rrosion Steel

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