Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

FP5

CREVCORR Berichtzusammenfassung

Project ID: G5RD-CT-2000-00139
Gefördert unter: FP5-GROWTH
Land: France

Report specifying artificial seawater with biocapacity and discussing anaerobic biofilm/synergistic effects

Aerobic bacteria settled on the stainless steel surface fraction freely exposed to natural seawater and SRB bacteria active under shielded areas act in synergistic way as promoters of crevice corrosion onset, being the cathodic reaction(s) accelerated by the aerobic biofilm and the anodic passivation locally decreased by the anaerobic biofilm. In laboratory tests, the effect of aerobic bacteria can be simulated by adding glucose oxidase and glucose to sterile seawater whereas the effect of anaerobic bacteria can be simulated by adding Na2S and HCl to sterile de-aerated seawater. A total sulphide concentration of about 400 ppm and a pH in between 6.7 to 7 is suggested. The settlement of aerobic bacteria on the SS surface fraction freely exposed to natural seawater and the presence of active SRB bacteria under shielded areas act in synergistic way as promoters of crevice corrosion onset, being the cathodic reaction(s) accelerated by the aerobic biofilm and the anodic resistance locally decreased by the anaerobic biofilm.

The report presents a new synthetic seawater with biocapacity that can simulate natural seawaters at ambient temperature.

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