Cathodic Activity on Passive Materials in Deep Seawater
| Autor: | Dominique Thierry, Erwan Diler, Nicolas Larché |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
020209 energy General Chemical Engineering fungi Analytical chemistry Cathodic polarization 02 engineering and technology General Chemistry 010501 environmental sciences 01 natural sciences Cathodic protection symbols.namesake 0202 electrical engineering electronic engineering information engineering symbols General Materials Science Seawater Raman spectroscopy 0105 earth and related environmental sciences |
| Zdroj: | Corrosion. 76:344-355 |
| ISSN: | 1938-159X 0010-9312 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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