Istituto di Scienze Marine     
Faimali M., Chelossi E., Garaventa F., Corrà C., Greco G., Mollica A. Evolution of oxygen reduction current and biofilm on stainless steels cathodically polarised in natural aerated seawater. In: Biocorys 2007 : International Conference on Biocorrosion of Materials (Paris, 11-14 June 2007). Abstract, pp. EC-O-20-1 - EC-O-20-10. Cefracor, 2007.
A model was developed to describe the evolution of the oxygen reduction current on Stainless Steel (SS) samples cathodically polarised during their exposure to natural aerated seawater: it is assumed that two oxygen reduction currents, a slow and a fast one, can concurrently run on complementary surface fractions. It is assumed, in addition, that the “active” surface fraction, on which the fast reduction kinetics runs, increases during SS exposure to seawater following a logistic expression completely defined once an incubation time t0 and a “duplication time for the current” tc are fixed. A second model was then developed to describe the evolution of the bacteria population during the first phases of the biofilm growth. In this model the evolution of the bacteria settlement is defined when two numbers, the probability p that a plankton bacteria changes into a settled bacteria and an “apparent duplication time” tb defined as the time necessary for a settled bacteria to generate another bacteria which settles in turn, are fixed. The two models were applied to fit the relevant data collected during several field tests organised in such a way that, both, the evolutions of the cathodic current and of bacteria population on cathodically polarised SS samples exposed to natural aerated seawater were independently followed.
Subject stainless steels
oxygen reduction
cathodic polarisation

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