Effect of biomineralized manganese on the corrosion behavior of C1008 mild steel
The possibility that biomineralized manganese dioxide (MnO{sub 2}) might serve as an efficient cathodic reactant in mild steel corrosion was studied using stainless steel (SS) covered with microbially or electrochemically deposited MnO{sub 2} and galvanically coupled to mild steel and mild steel covered with microbially deposited MnO{sub 2}. Biofilms of the manganese-oxidizing bacteria, Leptothrix discophora SP-6, were used to deposit biomineralized MnO{sub 2}. When MnO{sub 2} was biologically deposited on the SS, the corrosion rate of the galvanically coupled mild steel was initially about eight times higher than that in a control experiment without depositing manganese. After a few minutes, the MnO{sub 2} discharged and the corrosion rate of the mild steel decreased to values comparable with biofouled cathodes without manganese. When MnO{sub 2} was electroplated on SS, a linear relation between the amount of MnO{sub 2} and the duration of the elevated corrosion rate of mild steel was observed. However, when MnO{sub 2} was biologically deposited directly onto the mild steel, the corrosion rate did not increase, possibly because the corrosion product buildup on the mild steel surface prevented electrical contact between the manganese oxide and the underlying metal.
- Research Organization:
- Montana State Univ., Bozeman, MT (US)
- OSTI ID:
- 20014474
- Journal Information:
- Corrosion (Houston), Journal Name: Corrosion (Houston) Journal Issue: 1 Vol. 56; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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