Cathodic Activity on Passive Materials in Deep Seawater

In this study, the cathodic activity of biofilmed stainless steel surfaces was investigated at two exposure depths at the same location at 1,020 m and 2,020 m depth. For this purpose, a set of passive materials and sensors were exposed for 11 months in Azores, in the Atlantic Ocean. Characteristic c...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2020-04, Vol.76 (4), p.344-355
Main Authors: Diler, Erwan, Larché, Nicolas, Thierry, Dominique
Format: Article
Language:English
Subjects:
Aluminum
Atlantic Ocean
Bioactivity
Biofilms
Biological activity
Calcareous deposition
Cathodic activity
Cathodic current density
Cathodic depolarization
Cathodic polarization
Cathodic protection
Cathodic protection depolarization
Chemical analysis
Corrosion potential
Current density
Deep water
Depolarization
Depth
Electrodes
Electrolytes
Exposure
Flow velocity
High current densities
Microorganisms
Passive materials
Potential ennoblement
Raman spectroscopy
Seawater
Sensors
Stainless steel
Stainless steel surface
Stainless steels
Titanium
Water analysis
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Summary:In this study, the cathodic activity of biofilmed stainless steel surfaces was investigated at two exposure depths at the same location at 1,020 m and 2,020 m depth. For this purpose, a set of passive materials and sensors were exposed for 11 months in Azores, in the Atlantic Ocean. Characteristic cathodic depolarizations due to biological activity were observed in intermediary and deep water. However, a strong cathodic activity was only measured in deep water. Potential ennoblement appeared between 80 d and 200 d, depending on the exposure depth and the experimental setup used. In a given environment, the biological cathodic activity appears to be strongly related to the limiting parameter of the reaction, which can be anodic or cathodic. The biofilm sensors exposed for the first time in open, deep water appear relevant to discriminate cathodically “strongly-active” and “weakly-active” biological activity. Under cathodic control, a high current density was measured on stainless steel in deep seawater. The experimental setup used is particularly relevant as it allows determination in situ of the maximal cathodic current density.
ISSN:0010-9312
1938-159X
1938-159X
DOI:10.5006/3328