Abstract
Electrochemical measurements (EIS and DC-polarisation curves) have
been conducted on carbon steel coupons exposed in SRB-active
environments. Results from EIS measurements show that very large
interfacial capacities are found in such systems, and consequently
high capacitive currents are to be expected when conducting d.c.
polarisation scans. Further, it is indicated that the interfacial
capacitance correlates with the concentration of dissolved
sulfide, which in turn, to some degree, correlates with
hydrogenase activity. It is suggested that the large and
increasing interfacial capacitance is responsible for the large
potential hysteresis generally found in d.c. scans obtained in
these environments. By comparing polarisation curves obtained
using different scan rates in an inorganic control environment, it
is suggested that an ever increasing interfacial capacitance may
be responsible for a misleading conclusion that increasing
corrosion rates are caused by cathodic depolarisation in
SRB-active environments.
Original language | English |
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Title of host publication | Aspects of microbially induced corrosion |
Place of Publication | London |
Publisher | The Institute of Materials |
Publication date | 1997 |
Pages | 11-24 |
Publication status | Published - 1997 |