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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 .

Die Rolle von Redoxmediatoren bei der Korrosion des Bleidioxids in HBF 4 The Role of Redox Mediators in the Corrosion of Lead Dioxide in HBF 4