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Title (Primary) Corrosion protection by anaerobiosis
Author Volkland, H.P.; Harms, H.; Wanner, O.; Zehnder, A.J.B.;
Journal Water Science and Technology
Year 2001
Department UMB;
Volume 44
Issue 8
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.
ID 6892
Persistent UFZ Identifier
Volkland, H.P., Harms, H., Wanner, O., Zehnder, A.J.B. (2001):
Corrosion protection by anaerobiosis
Water Sci. Technol. 44 (8), 103 - 106