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Relationship between the ennoblement of passive metals and microbe adsorption kinetics in seawater
Author(s) -
Wei W.,
Jia W.,
Haibo X.,
Xiangbo L.
Publication year - 2005
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200403840
Subject(s) - adsorption , seawater , bacteria , metal , kinetics , chemistry , corrosion , biofilm , chemical engineering , environmental chemistry , biology , organic chemistry , ecology , genetics , physics , quantum mechanics , engineering
The relationship between microbial colonization of two kinds of passive metals and ennobling of their corrosion potentials (E corr ) were studied. Two types of passive metal coupons were exposed to natural seawater for about ten days. Under laboratory conditions, all corrosion potentials of the samples ennobled for about 200 mV. Epifluorescence microscopy showed that bacteria adsorption was the main process during about the first day immersion and bacteria reproduced in the following days. The bacteria number increased on the metal surface according to an exponential law and the kinetics of bacteria adsorption at the metal surface during this period was proposed. The ennoblement of E corr was similar to the increasing bacteria number: E corr increased quickly during the bacteria adsorption process and increased slowly after biofilms had formed.