Journal article
Corrosion protection by anaerobiosis
- Volkland, H.P. Swiss Federal Institute for Environmental Science and Technology (EAWAG) and Swiss Federal Institute of Technology (ETH), Ueberlandstrasse 133, CH-8600 Duebendorf, Switzerland
- Harms, H. Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne
- Wanner, O. Swiss Federal Institute for Environmental Science and Technology (EAWAG) and Swiss Federal Institute of Technology (ETH), Ueberlandstrasse 133, CH-8600 Duebendorf, Switzerland
- Zehnder, A.J.B. Swiss Federal Institute for Environmental Science and Technology (EAWAG) and Swiss Federal Institute of Technology (ETH), Ueberlandstrasse 133, CH-8600 Duebendorf, Switzerland
Published in:
- Water Science and Technology. - IWA Publishing. - 2001, vol. 44, no. 8, p. 103-106
English
Biofilm-forming bacteria can protect mild (unalloyed) steel from corrosion. Mild steel coupons incubated with Rhodoccocus sp. strain C125 and Pseudomonas putida mt2 in an aerobic phosphate-buffered medium containing benzoate as carbon and energy source, underwent a surface reaction leading to the formation of a corrosion-inhibiting vivianite layer [Fe3(PO4)2]. Electrochemical potential (E) measurements allowed us to follow the buildup of the vivianite cover. The presence of sufficient metabolically active bacteria at the steel surface resulted in an E decrease to -510 mV, the potential of free iron, and a continuous release of ferrous iron. Part of the dissolved iron precipitated as vivianite in a compact layer of two to three microns in thickness. This layer prevented corrosion of mild steel for over two weeks, even in a highly corrosive medium. A concentration of 20 mM phosphate in the medium was found to be a prerequisite for the formation of the vivianite layer.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.2166/wst.2001.0475
- ISSN 0273-1223
- Persistent URL
- https://sonar.ch/global/documents/274508
Statistics
Document views: 24
File downloads: