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- W2034632725 abstract "Abstract Layers of lead dioxide, electrochemically deposited on graphite filled polypropylene, corrode rather slowly in 1 m HBF 4 /1 m Pb (BF 4 ) 2 under oxygen evolution with an equivalent current den sity of 1 - 4 μA/cm 2 . The rate of corrosion may be accelerated by a factor of 100 by localized cell action with graphite. In the presence of reducing agents like Fe ++ or V +++ , a significant acceleration occurs as well, which is limited by transport to the surface of the oxide. The oxidized component may be regenerated continously at a lead counterelectrode. However, hydroquinone is partially oxidized irreversibly beyond the quinone stage, and Tl + is partially incorporated as Tl 2 O 3 . Chemically prepared lead dioxide powders corrode slowly in 1 m HBF 4 as well and tend to passivate. The passivation is only partially avoided by collision with a lead surface. However, rapid dissolution occurs in the presence of reducing agents like Fe ++ . The acceleration is shown to exceed the stoichiometric conversion of the redox mediator. Additional measurements with Pb 3 O 4 powders have been performed. Consequences in regard to the lead tetra-fluoborate accumulator are discussed." @default.
- W2034632725 created "2016-06-24" @default.
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- W2034632725 date "1977-09-01" @default.
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- W2034632725 title "Die Rolle von Redoxmediatoren bei der Korrosion des Bleidioxids in HBF4 The Role of Redox Mediators in the Corrosion of Lead Dioxide in HBF4" @default.
- W2034632725 doi "https://doi.org/10.1515/zna-1977-0921" @default.
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