A Comparative Study of Lead Alloy Electrode and CF/β-PbO₂ Electrode for Zinc Electrowinning

Abstract

A comparative study of lead alloy electrode and carbon fibers based β-PbO 2 (CF/β-PbO 2 ) electrode for zinc electrowinning was discussed. The effect of electrodeposition time on the preparation and properties of the CF/β-PbO 2 electrode was firstly studied. Surface morphology, interface properties, electrochemical property and corrosion resistance of the CF/β-PbO 2 electrodes were investigated. It was found that the optimal conditions are 40 mA•cm −2 , 150 g L −1 Pb(NO 3 ) 2 and 100 min. Under this conditions, a smooothest surface of β-PbO 2 active layer is obtained. The weightlessness rate is 0.22%. The interface resistivity of the electrode is 6.79 × 10 −5 Ω•m. The oxygen evolution overpotentials of the electrode is 0.931 V. Compared to the traditional lead alloy electrode, the self-corrosion potential of the CF/β-PbO 2 electrode is 1.085 V.

A novel CF/Ti/β-PbO2 composite anode for zinc electrowinning: preparation, electrochemical properties and application

“…Therefore, the larger the value of E corr , the lower the corrosion tendency of the material, and the better the corrosion resistance. 18 Fig. 20 and Table 5 show that E corr of the CF/Ti/β-PbO 2 composite anode is 0.730 V ( vs. SCE), which is much larger than that of the Pb–Ag anode, showing that the material of the CF/Ti/β-PbO 2 composite anode has good corrosion resistance.…”

“…The active coating on the carbon fiber consists of platinum group metal oxides, PbO 2 , Co 2 O 3 , and MnO 2 . 18 The polarization potential of the CF/β-PbO 2 anode prepared by Liu was 2.317 V, which is lower than that of the conventional lead–silver alloy anode. The corrosion rate of the CF/β-PbO 2 anode was 1.64 × 10 −3 g cm −2 h −1 , which is about 1/5 of that of the conventional lead–silver alloy anode.…”

The influence of temperature and dissolved oxygen on the electrochemical nature of Al–Zn–In–Ga galvanic anode

“…Pure aluminum is inadequate for sacrificial anode material because it unfolds a relatively noble corrosion potential (-0.75 mV versus SCE) in saline media due to a protective γ-Al 2 O 3 film on the surface [5,6]. For the sake of activating the surface, Al is necessarily alloyed with befitting elements such as Sn, In, Zn, Ga, Mg, and so on [7][8][9][10][11][12][13]. Researchers at home and abroad have carried out to find the impact of In and Zn on aluminum sacrificial anodes in the existence of aggressive anions [6,[14][15][16][17][18].…”

Preparation and Electrochemical Properties of the CF-Ti/β-PbO2 Composite Anode for Zinc Electrowinning

“…The Ti/Sb-SnO 2 /β-PbO 2 composite anode showed a prolonged electrolysis duration of 23 h at a steady current density of 1.0 A•cm −2 in a solution containing 1.0 mol•l −1 of H 2 SO 4 . Research on the benefits of carbon fiber-based anodes, including their lightweight nature, excellent electrical conductivity, and robust resistance to corrosion, [24][25][26][27] has gained significant attention. The corrosion rates of CF/β-PbO 2 anodes and traditional lead-silver anodes are 1.53 × 10 −3 g•cm −2 •h −1 and 8.64 × 10 −3 g•cm −2 •h −1 , respectively.…”

“…Therefore, the CF/β-PbO 2 anode has better corrosion resistance than the traditional lead-silver anode. 27 Typically, common methods used to prepare composites based on titanium include blending through mechanical means, synthesis at high temperatures that propagate on their own, and metallurgy involving powders. In mechanical alloys, the sample is in a very unstable thermodynamic state and is prone to oxidation.…”