Abstract
Anodic polarization of lead an lead alloys at high cds in chloride solution results in the formation of a thick, voluminous, porous deposit of lead chloride. When a platinum microelectrode is introduced into lead, lead dioxide is formed on the surface of lead in chloride medium during anodic polarization at high cds. As a replacement for costly platinum, lead dioxide pieces which fell during the electrodeposition of lead dioxide were shaped into small cylindrical microelectrodes, inserted into the lead or lead alloys and anodically polarized in chloride solution. In this case lead dioxide is also formed on the surface of the lead or lead alloy. It has been found that the formation of lead dioxide on the leadlead dioxide bielectrode is good in 3% NaCl solution at an anode cd of 3 A/dm 2 and at room temperature. The effect of withdrawal and insertion of lead dioxide microelectrode, and of the relative area of lead dioxide microelectrode, to lead on the formation of lead dioxide is also studied. Studies on the weight change during anodic polarization of lead and lead alloys embedded with lead dioxide microelectrode, in chloride solution and in synthetic sea water show that leadsilver (1%) alloy is by far the best anode from the point of view of the formation of a compact and crackfree deposit of lead dioxide on the surface.
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