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Pb-substrate/3D-PbO2/MeOx composite anode and preparation method thereof

A composite anode, 3d-pbo2 technology, applied in anodizing, electrodes, electrolysis processes, etc., can solve the problems of low coating stability and unsatisfactory corrosion resistance, achieve long service life, improve electronic conductivity, reduce The effect of anode potential

Active Publication Date: 2017-06-13
KUNMING HENDERA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the disadvantages of low coating stability and unsatisfactory corrosion resistance of the traditional lead-based coating anode and the titanium-based coating anode is not suitable for high-concentration H 2 SO 4 problems in the system, a Pb-based / 3D-PbO 2 / MeO x composite anode, the 3D-PbO 2 The porous skeleton can fix the oxide film layer, withstand the internal pressure inside the film layer due to electrolyte swelling and phase transformation, inhibit the cracking and peeling of the oxide film layer, improve the film stability of the lead-based anode and prolong the service life of the electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using pure Pb plate as anode and graphite as cathode, 3D-PbO was constructed on the surface of pure Pb plate by electrochemical anodic oxidation process. 2 The structure and process conditions are: cell voltage 20 V, deposition time 30s, electrolyte composition: ethylene glycol: water = 10: 1, etchant is HCl, concentration is 0.05 mol / L, supporting electrolyte is K 2 SO 4 , the concentration is 1.2 mol / L. A 3D porous structure with a pore diameter of about 20 μm and a thickness of about 500 μm was obtained. In Ce(NO 3 ) 3, Pb(NO 3 ) 2 , Mn(NO 3 ) 2 Electrodeposition of CeO by Anodic Oxidation in Solution 2 -PbO 2 -MnO 2 Composite oxide coating. The composite anode was galvanostatically polarized (500 A m -2 ) After 72 h, no obvious cracks appeared in the oxide coating, and the coating was denser and smoother.

Embodiment 2

[0025] Using Pb-Ag plate as anode and graphite as cathode, 3D-PbO was constructed on the surface of Pb-Ag plate by electrochemical anodization process. 2 The structure and process conditions are: cell voltage 30 V, deposition time 20 min, electrolyte composition: ethylene glycol: water = 8 : 1, etchant is H 2 C 2 o 4 , the concentration is 0.2 mol / L, and the supporting electrolyte is Na 2 SO 4 , the concentration is 0.8 mol / L. A 3D porous structure with a pore diameter of about 30 μm and a thickness of about 700 μm was obtained. in PbNO 3 , MnO 2 Chemical-Electrochemical Composite Deposition of PbO in Solution of Particles 2 -MnO 2 oxide coating. The composite anode was galvanostatically polarized (400 A m -2 ) After 144 h, the coating with 3D-PbO 2 The morphology of the structural bonding interface shows that the two are well bonded, and no cracks and holes are seen.

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PUM

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Abstract

The invention discloses a Pb-substrate / 3D-PbO2 / MeOx composite anode and a preparation method thereof. The Pb-substrate / 3D-PbO2 / MeOx composite anode comprises a Pb substrate, 3D-PbO2 and a metal oxide film layer. The preparation method includes constructing a 3D-PbO2 structure on the surface of the Pb substrate through an electrochemical anodic oxidation method, and depositing MeOx inside the 3D-PbO2 structure through an electrochemical deposition or chemical deposition method. The Pb-substrate / 3D-PbO2 / MeOx composite anode and the preparation method thereof have the advantages that the 3D-PbO2 structure is capable of enlarging a contact area between the Pb substrate and the metal oxide film layer, fixing the metal oxide film layer, bearing internal pressure generated by electrolyte solution inflation and phase transformation and inhibiting cracking and peeling of the film layer, and accordingly the Pb-substrate / 3D-PbO2 / MeOx composite anode is higher in film layer stability and longer in service life as compared with a traditional Pb-substrate coated composite anode; the preparation method is simple in preparation technology and easy for industrialization.

Description

technical field [0001] The invention belongs to the fields of electrochemistry and material preparation, and specifically relates to a Pb-based / 3D-PbO 2 / MeO x Composite anode and its preparation method. Background technique [0002] Pb-based anodes are widely used in the hydrometallurgical industry, such as the electrodeposition process of Zn, Mn, Cu, Co, Ni, etc. Although the Pb-based anode has the advantages of low cost and simple preparation process, its corrosion resistance is not ideal in the service environment of high current density and high concentration of sulfuric acid, which leads to the short service life of the Pb-based anode, and the precipitation of corrosion products in the cathode reduces the quality of the cathode product. . The main ways to improve the corrosion resistance and service life of lead-based anodes at home and abroad are: (i) Regulating the metallographic structure of lead alloys. Such as optimization of alloy composition, heat treatment ...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25C7/02C25D11/34
CPCC25C7/02C25D11/34C25B11/057C25B11/061C25B11/077
Inventor 钟晓聪王瑞祥徐志峰曹才放贺山明韩海军
Owner KUNMING HENDERA SCI & TECH