Electrochemical Identification of Higher Oxides of Manganese in Corrosion Relevant Deposits Formed by Microorganisms

Linhardt, P.

doi:10.4028/www.scientific.net/msf.289-292.1267

Cited by 19 publications

(20 citation statements)

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“…The potentials (£*) were calculated at a pH of 7.2 and [Mn 2+ ] = 10~6. demonstrated that surface coverage of 6% by manganese oxides can increase therestingpotentialof stainless steels (-200mVscE) by 500 mV, which coincides closely with the reported equilibrium potential of theoxides+362mVscEatapHof7.2 (Dickinsonew/., 1997;Linhardt, 1998).…”

Section: Introductionsupporting

confidence: 77%

The influence of environmental factors on the rate and extent of stainless steel ennoblement mediated by manganese‐oxidizing biofilms

Braughton

LaFond

Lewandowski³

2001

Biofouling

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The increase in the open circuit potential of passive metals in natural waters due to biofilm formation at the metal surface, termed ennoblement, has been reported for nearly 30 years. Although its occurrence is undoubtedly associated with microbial colonization, the underlying mechanism of ennoblement remains controversial. Recent work produced in the authors' laboratory has provided convincing experimental evidence that ennoblement can be caused by deposition of biomineralized manganese produced by manganeseoxidizing biofilms. The purpose of this study was to determine the effects of environmental factors on the rate and extent of ennoblement of 316L stainless steel exposed to natural waters. This was accomplished by exposing corrosion coupons to four freshwater systems over a 4-yearperiod. The rate and extent of ennoblement observed in these locations was correlated with dissolved manganese concentrations, the mass of accumulated manganese oxides, organic carbon concentration, dissolved oxygen concentration, flow, conditions, temperature, and pH in these environments.

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Section: Introductionsupporting

confidence: 77%

The influence of environmental factors on the rate and extent of stainless steel ennoblement mediated by manganese‐oxidizing biofilms

Braughton

LaFond

Lewandowski³

2001

Biofouling

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“…À1.2 V (Ag/AgCl) and two oxidation peaks at approx. À0.9 and À0.8 V, corresponding to trivalent iron oxide Linhardt, 1998;Neugebauer et al, 1981). These observations were not reproducible.…”

Section: Particle and Surface Characterizationcontrasting

confidence: 50%

Bioaccessibility of micron-sized powder particles of molybdenum metal, iron metal, molybdenum oxides and ferromolybdenum – Importance of surface oxides

Mörsdorf

Wallinder

Hedberg

2015

Regulatory Toxicology and Pharmacology

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a b s t r a c tThe European chemical framework REACH requires that hazards and risks posed by chemicals, including alloys and metals, that are manufactured, imported or used in different products (substances or articles) are identified and proven safe for humans and the environment. Metals and alloys need hence to be investigated on their extent of released metals (bioaccessibility) in biologically relevant environments. Read-across from available studies may be used for similar materials. This study investigates the release of molybdenum and iron from powder particles of molybdenum metal (Mo), a ferromolybdenum alloy (FeMo), an iron metal powder (Fe), MoO 2 , and MoO 3 in different synthetic body fluids of pH ranging from 1.5 to 7.4 and of different composition. Spectroscopic tools and cyclic voltammetry have been employed to characterize surface oxides, microscopy, light scattering and nitrogen absorption for particle characterization, and atomic absorption spectroscopy to quantify released amounts of metals. The release of molybdenum from the Mo powder generally increased with pH and was influenced by the fluid composition. The mixed iron and molybdenum surface oxide of the FeMo powder acted as a barrier both at acidic and weakly alkaline conditions. These findings underline the importance of the surface oxide characteristics for the bioaccessibility of metal alloys.

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“…Similar effects were obtained by partially covering the steel surface with chemically prepared hydrous MnO 2 [14,16]. Similar mixtures have been identified in later electrochemical studies of manganese rich corrosion products [23]. Investigations of severe pitting failure of CrNi134 steel runner blades in a Dutch hydroelectric power plant, revealed large amounts of manganese rich minerals within corrosion products and biofilms on the surface [15,18].…”

Section: Introductionsupporting

confidence: 58%

Effect of biomineralized manganese on pitting corrosion of type 304L stainless steel

Højris

Yurt

Lewandowski

2001

Materials and Corrosion

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Electrochemical Identification of Higher Oxides of Manganese in Corrosion Relevant Deposits Formed by Microorganisms

Cited by 19 publications

References 0 publications

The influence of environmental factors on the rate and extent of stainless steel ennoblement mediated by manganese‐oxidizing biofilms

The influence of environmental factors on the rate and extent of stainless steel ennoblement mediated by manganese‐oxidizing biofilms

Bioaccessibility of micron-sized powder particles of molybdenum metal, iron metal, molybdenum oxides and ferromolybdenum – Importance of surface oxides

Effect of biomineralized manganese on pitting corrosion of type 304L stainless steel

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