Study On Surface Modification Of Lead - Based Alloy Anode

Zinc is an important non-ferrous metal materials, has been the third largest non-ferrous metalsat present, only second to copper and aluminum zinc consumption in the non-ferrous metals. Zinc metal has good rolling resistance, wear resistance and corrosion resistance,and can be made various alloys with more excellent physical and chemical properties.Hydrometallurgy used as a method to smelt zinchas been widely adopted with advantages such as large capacity, high efficiency, good operating conditions, light pollution and comprehensive recovery of valuable metals.In zinc electrowinning, the selection of anode material directly affects the quality of the electrical energy consumption during product and cathode product. General electrode materials must meet the following basic requirements(1) good conductivity;(2) corrosion resistance; good(3)mechanical strength and workability;(4) long life;(5) the electrode reaction has good electrical Catalytic performance. This paper studies have lead-based alloy anode passivation film case and no passivation film,using optical microscopy, polarization curves, scanning electron microscopy and other methods, the results as follow:1.At the same temperature, the lead-based alloy with no passivation film corrodes in the solution and the speed to generate new passivation film increase with the solution concentration increase,the corrosion itself,cause corrosion of lead-based alloys;2.At the same temperature, the lead-based alloy with no passivation film corrodesslowly in the solution, the corrosion speed decrease with the solution concentration increase, the slower the corrosion of lead-based alloys have a protective effect.