Publication Details |
Category | Text Publication |
Reference Category | Journals |
URL | http://www.iwaponline.com/wst/04408/wst044080103.htm |
Title (Primary) | Corrosion protection by anaerobiosis |
Author | Volkland, H.P.; Harms, H.; Wanner, O.; Zehnder, A.J.B. |
Source Titel | Water Science and Technology |
Year | 2001 |
Department | UMB |
Volume | 44 |
Issue | 8 |
Page From | 103 |
Page To | 106 |
Language | englisch |
Abstract | 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. |
Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=6892 |
Volkland, H.P., Harms, H., Wanner, O., Zehnder, A.J.B. (2001): Corrosion protection by anaerobiosis Water Sci. Technol. 44 (8), 103 - 106 |