Matériaux & Techniques
Volume 78, Number 12, 1990
|Page(s)||17 - 24|
|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
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 ;
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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