Formation Mechanism of Non-conductive PbSO₄ on IrO₂-Ta₂O₅/Ti Anodes in Copper Foil Production

抄録

This study elucidated electrochemical behaviors of an IrO₂-Ta₂O₅/Ti anode and pre-deposited PbO₂ layers of two types on IrO₂-Ta₂O₅/Ti anodes in H₂SO₄ solutions. The onset potential for the reduction of β-PbO₂ of a pre-deposited PbO₂ layer prepared from acidic solutions was more positive than the oxygen evolution potential on the IrO₂-Ta₂O₅/Ti anode. Formation of a non-conductive PbSO₄ film on IrO₂- Ta₂O₅/Ti anodes in copper foil production can be attributed to the formation of a local cell consisting of a PbO₂ cathode and an IrO₂-Ta₂O₅ anode during an open-circuit condition.