Method for improving corrosion resistance of Pb-Ag-based MnO2 coated electrode for zinc electrodeposition under assistance of illumination

By forming a MnO2 film on the surface of a Pb-Ag anode and then subjecting it to photo-irradiation, the problems of high oxygen evolution overpotential and easy corrosion during zinc electrowinning are solved. This improves the oxygen evolution activity and corrosion resistance of the MnO2 coating, reduces energy consumption, and avoids impurity contamination, making it suitable for zinc electrowinning processes.

CN121718935APending Publication Date: 2026-03-24KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202512006803.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

In the existing zinc electrodeposition process, Pb-Ag anodes suffer from problems such as high oxygen evolution overpotential and easy corrosion and dissolution. Traditional coating technology cannot effectively improve the oxygen evolution activity and corrosion resistance of MnO2 coatings without changing the electrodeposition process or introducing foreign substances.

Method used

After forming a MnO2 film on the Pb-Ag anode surface, a uniform and dense MnO2 film is formed by photo-irradiation. The photo-irradiation treatment uses a light source wavelength of 300~2500nm, a light intensity of 100~2000mW/cm2, and a time of 5~60min. The method is continuous, intermittent or pulsed light irradiation to improve the oxygen evolution activity and corrosion resistance of the MnO2 coating.

Benefits of technology

It significantly reduces oxygen evolution overpotential, increases charge transfer resistance, reduces corrosion current density, delays anodic corrosion, reduces energy consumption, avoids the risk of electrolyte contamination from foreign impurities, and possesses excellent process compatibility and industrial applicability.

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Abstract

The invention discloses a method for improving the corrosion resistance of a Pb-Ag-based MnO2 coated electrode for zinc electrodeposition under the assistance of illumination, and belongs to the technical field of zinc electrodeposition production. According to the method, after the Pb-Ag anode is plated with the MnO2 film, the illumination treatment procedure is introduced, so that the uniform and compact MnO2 film with high oxygen evolution activity and corrosion resistance is formed on the surface of the Pb-Ag anode, the interface stability and corrosion resistance of the electrode are effectively enhanced through illumination treatment, anode corrosion is remarkably delayed, and energy consumption in the zinc electrodeposition process is reduced. Compared with an existing method depending on element doping or additive modification, the method has the advantages that the risk of electrolyte pollution caused by introduction of external impurities is avoided, and the method has excellent process compatibility and industrial applicability.
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Citation Information

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