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Advanced studies on the influence of manganese on the potential increase of stainless steels

✍ Scribed by R. Kreikenbohm; M. Eisenbeis; P. Gümpel; P. Linhardt

Publisher
John Wiley and Sons
Year
2003
Tongue
German
Weight
191 KB
Volume
54
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The influence of manganese on the time course and on the final value of the open‐circuit potential of microbially influenced stainless steel (SS) has been examined by variation of the concentration of manganese in the aqueous phase and on the surface of the metal sample. Under the influence of bacteria stable final values of the open‐circuit potential are attained at 540 mV or 620 mV depending on the manganese concentration in the aqueous phase, the duration of the experiment, and the supply of oxygen. These potential values can also be fixed electrochemically by anodic deposition of MnO~2~ on the metal surface.

According to the results obtained with different techniques, the electron flow from the metal towards the oxygen is a combination of biotic and abiotic processes. Besides the microbial oxidation of manganese the electron flow via a Mn‐based redox enzyme system has to be discussed.

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