Potentiostatic oxidations of lead in
1N H2SO4
were performed in the potential range between −900 and +1400 mv (with respect to the mercury/mercury sulfate electrode). The anodic layer was subjected to x‐ray diffraction and chemical analysis. According to the phases present three potential ranges are discerned. From −956 to about −300 mv only
PbSO4
is present. From −300 to +900 mv large amounts of
PbSO4
and
normalPbO‐normaltet
are formed as well as small amounts of
normalPbO·PbSO4
,
3normalPbO·PbSO4·H2O
,
5normalPbO·2H2O
or
normalPbO
orthorhombic and
α‐PbO2
. Above +900 mv the divalent lead compound content decreases, while that of
α‐PbO2
. rapidly increases. Above +1200 mv
β‐PbO2
. is formed.
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