Anodic Polarization of Lead-Platinum Bielectrodes In Chloride Solutions Available to Purchase

An account is given of potential-time studies made to determine the effect of a platinum microelectrode on the behavior of lead in chloride solutions. Topics discussed include current through platinum electrode, effect of relative areas of platinum/lead on potential, effect of withdrawal and insertion of platinum, weight change during anodic polarization, formation of lead peroxide films and use for cathodic protection of platinum-lead bielectrodes. It is considered that the platinum microelectrode serves to: (1) limit the initial formation of lead chloride, (2) oxidize plumbous ions to lead peroxide, (3) act as a “chlorine valve” so that lead chloride formation is prevented during operation. 3.8.3, 6.3.8