抗脱落铁基二氧化铅电极的研究

采用3步阳极氧化法在铁片表面依次生成铁氧化膜、β-PbO₂和α-PbO₂，制得结合牢固、抗脱落性能优良、具有 Fe/Fe_xO_y/β-PbO₂/α-PbO₂结构的铁基二氧化铅电极。采用XPS、XRD、交流阻抗和扫描电镜对铁氧化膜组成、β-PbO₂和α-PbO₂的晶型及电化学活性、电极切面结构进行了分析表征。借鉴漆膜性能标准测试方法，对铁基二氧化铅镀层的抗机械脱落性能进行了综合测试评价。研究发现，预先将铁基体放在4 mol/L KOH水溶液中，在温度80℃、阳极电流密度60mA/cm²条件下，使铁片表面预氧化生成一层棕红色的Fe₃O₄薄膜，然后再依次阳极氧化电镀β-PbO₂和α-PbO₂，能够获得抗机械脱落性好、电化学反应活性高的铁基二氧化铅电极。

A delamination-resistant lead dioxide electrode deposited on iron

A composite lead dioxide electrode electrodeposited on iron has been prepared by three-step anodic electro-deposition. Iron was first electro-oxidized in 4mol/L KOH solution at a current density of 60mA/cm² and a temperature of 80℃ to form a primary oxide layer. XPS analysis indicates that this primary oxide layer is Fe₃O₄. A β-PbO₂ layer, which has good adhesion with the primary oxide layer, was then electrodeposited as an intermediate layer followed by the deposition of an α-PbO₂ layer having high electrochemical activity as the top layer. The Fe/Fe_xO_y/β-PbO₂/α-PbO₂ composite electrode was characterized by XPS, XRD, AC impedance and SEM. The mechanical properties of the electrode were also evaluated using the standard paint film adhesion test. The electrode was shown to possess both good adhesion properties and high electrochemical activity.