| Issue |
Matériaux & Techniques
Volume 78, Number 12, 1990
|
|
|---|---|---|
| Page(s) | 17 - 24 | |
| DOI | https://doi.org/10.1051/mattech/199078120017 | |
| Published online | 13 April 2017 | |
Corrosion d’alliages à transition actif-passif en eau de mer
C.N.R. Istituto per la Corrosione Marina dei Metalli Genova, Italy
Abstract
The settlement of a bacterial aerobic biofilm on the surfaces of a lot of active-passive alloys (stainless steels, Ni-Cu alloys, Ni-Cr alloys, titanium...) immersed in natural seawater, causes a depolarization of oxygen reduction. From that it follows:
- —
an increase of 300-40 mV of the free corrosion potential of alloys in passive state and, therefore, an increase of the risk of localized corrosion initiation ;
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an increase, up to two orders of magnitude, of the localized corrosion rate;
- —
an increase of the galvanic currents in the coupling of active-passive alloys with other less nobles ones.
© SIRPE 1990
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