The Effect of Microorganism Attachmenet on the Open-circuit-potential of Passive Metals in Seawater

J Chin Soc Corr Pro

2004, Vol. 24

Issue (5): 262-266 DOI:

Research Report

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The Effect of Microorganism Attachmenet on the Open-circuit-potential of Passive Metals in Seawater

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中科院青岛海洋研究所

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Abstract An investigation on the changes in open-circuit-potentials of passive metals in seawater was made with electrochemical technology and epifluoresence microscopy. It was found that in natural seawater, the open-circuit-potentials of passive metals shifted in noble direction gradually. The in-situ microscope observation showed that biofilm gradually formed on the metal surfaces with the increase of open-circuit-potentials and the change in bacteria number on metal surface was in the same manner with the ennoblement of the open-circuit=potentials. However, compared that in natural sea water, both open-circuit-potentials and bacteria number are not changed in sterile seawater. In addition, open-circuit-potentials and bacteria number for coppper clectrode were almost not changed no matter in natural or in sterile seawater. Moreover, the double capacitance of passive metals decreased woth time when immersed in natural seawater, while it remained almost unchanged in sterile seawater due to the decrease in dielectric constant with the formation of bilfilm in natural seawater. Above results strongly supported that bacteria attachment and growth of bilfilms were the cause for the ennoblement of open-circuit-potentials of the passive metal.

Key words: microorganism open-circuit-potential electrochemistry

Received: 28 April 2003

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;. The Effect of Microorganism Attachmenet on the Open-circuit-potential of Passive Metals in Seawater. J Chin Soc Corr Pro, 2004, 24(5): 262-266 .

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