engleski

Fouling on steel panels in seawater and its electrochemical monitoring

Composition consisting of 3 steel and 3 glass panels was horizontally placed into Split aquatorium seawater, 30 cm above sandy bottom. Every fifteen days a pair of panels (a steel and glass one) were taken in order to determine the fouling species and measure the EOCP of panels before and after stripping of fouling communities. Also, the changes in EOCP for 4 electrodes were traced in laboratory conditions. In the spring 1995 a total of 30 species of algae (24 bentonic and 6 planctonic) were established on glass substrates placed next to steel. EOCP for the electrodes examined in laboratory conditions reach constant value after 10 days and corrosion process take place. In natural conditions the algae cells attached to the metal form compact layer providing a barrier to supply of oxygen and suppress the corrosion reactions. The subsequent colonization of SRB results in achieving mixed potential resulting from their activity and passive current density on the passivated parts of the panell.

immersion test; steel panels; algae colonization; SRB; Eocp

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