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Low-Ag-content Pb-RE-Ag alloy electrode

An alloy electrode, pb-re-ag technology, applied in the field of electrochemistry, can solve the problems of easy crusting of anode slime, alloy phase, structure difficult to control, and decrease of cathode current efficiency, so as to improve mechanical properties and corrosion resistance , Improve the mechanical strength and electrochemical performance, and improve the effect of mechanical properties

Inactive Publication Date: 2012-06-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these electrodes have the following problems: (1) Poor mechanical properties, easy to creep and flex, causing cathode and electrode short circuit, resulting in a decrease in cathode current efficiency and serious local corrosion of the electrode; (2) High oxygen evolution potential of the electrode, making the electrode (3) The electrode corrosion rate is high, and the corrosion products pollute the electrochemical process products
The above-mentioned Pb alloy grid for lead-acid storage battery mainly plays the role of active material carrier and current collector, and is compatible with metal electrodeposition, wastewater treatment, electroplating, organic electrosynthesis in terms of function, performance index, alloy composition and manufacturing process, etc. There is a significant difference in the Pb alloy electrodes used
In the above-mentioned electrodes for electrodeposition, the alloys used are all based on Pb-Ag alloys, and other alloying elements such as Ca, Al, Sn, Cr and Co are added to the basis of traditional Pb-Ag alloys, in an attempt to further improve the Pb-Ag alloy. The performance of the alloy electrode may partially reduce the Ag content, but there are some performance improvements while sacrificing other properties of the Pb-Ag alloy. It is difficult to obtain a Pb alloy electrode with comprehensive performance that meets the requirements at a low Ag content.
For example: Although the addition of Ca improves the strength of the alloy, in the actual use process, the anode slime formed on the electrode surface is easy to crust, causing problems such as an increase in the anode potential and short-circuiting of the cathode and anode.
For this reason, RE is generally added as an auxiliary alloying element to solve the problems caused by the addition of other alloying elements or the defects that are difficult to solve. , a variety of alloying elements are mutually restricted, and the addition of a low content of RE still cannot solve the series of inherent defects in these multi-element alloys
At the same time, the more alloy components, the lower the electrical conductivity of the alloy, and it is difficult to control the phase and structure of the alloy, which brings difficulties to the casting process of the alloy.
In addition, the new phase formed by the interaction between multi-component alloys may reduce the performance improvement ability of the single component, and eventually lead to the waste of RE

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Firstly, metal lead and rare earth are placed in a vacuum electromagnetic induction melting furnace to prepare a lead rare earth master alloy Pb-La (4wt.%) with high rare earth content. Then Pb-La(4wt.%), Ag and Pb were melted and cast together to form Pb-La(0.001wt.%)-Ag(0.6wt.%) alloy electrode, the alloy is relatively Pb-Ag(0.8wt.%) ) alloy electrode in the zinc electrowinning process, the oxygen evolution potential is reduced by 20mV, the corrosion rate is reduced by 18%, and the tensile strength is increased by 30%.

Embodiment 2

[0033] Firstly, metallic lead and corresponding rare earths were smelted in a vacuum electromagnetic induction melting furnace to prepare lead rare earth master alloys Pb-Sm (2wt.%), Pb-Er (2wt.%) and Pb-Ce (2wt.%). Pb-Sm(2wt.%), Pb-Er(2wt.%), Pb-Ce(2wt.%), Ag and pure Pb were melted and cast together into Pb-Ce(0.9wt.%)-Er(0.5wt.%) .%)-Sm(0.6wt.%)-Ag(0.001wt.%) rolled alloy electrode. The life of the electrode can reach 3 years when it is used in the process of treating wastewater containing aromatic organic substances.

Embodiment 3

[0035] Firstly, metallic lead and corresponding rare earths were smelted in a vacuum electromagnetic induction melting furnace to prepare Pb-Nd (1.0wt.%) and Pb-Gd (0.5wt.%) master alloys respectively. Melting and casting the above alloy together with Ag, Bi and Pb into:

[0036]Pb-Nd(0.3wt.%)-Gd(0.05wt.%)-Bi(0.05wt.%)-Ag(0.4wt.%) alloy electrode. The combination is applied in the electro-galvanizing industry, and compared with Pb-Ag (0.8wt.%), the electrode corrosion rate is reduced by 81%, the anode potential is reduced by 60mV, and the content of impurity elements in the plating layer of the plated parts is reduced by 51%.

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PUM

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Abstract

A low-Ag-content Pb-RE-Ag alloy electrode comprises (by weight percentage) rare earth (RE) 0.001-2.0, silver (Ag) 0.001-0.6 and lead in balance. RE is selected from at least one of La, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Dm, Yb, and Lu, and the total RE content is 0.001wt.%-2.0wt.%. With the invention, alloy has low cost, high mechanical strength, good corrosion resistance, and good electrochemical property, can find wide application in fields including metal electrodeposition, electroplating, wastewater treatment and organic electrosynthesis, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a Pb-RE-Ag alloy electrode with low silver content. Background technique [0002] The use of lead alloy electrodes has a history of hundreds of years. Because it can form an oxide film on the surface and has corrosion resistance, it is widely used in electrolytic deposition, electroplating, wastewater treatment, organic electrosynthesis and other fields. [0003] Lead alloy electrodes need to have the following properties, (1) good electrical conductivity; (2) strong corrosion resistance; (3) good mechanical strength and processing performance; (4) long life; catalytic performance. [0004] At present, Pb-Ca, Pb-Sn, Pb-Sb, Pb-Ag, Pb-Ag-Co, Pb-Ca-Al-Sn, Pb-Ag-Ca-Sr, Pb-Ag-Ca-Al have been developed successively -Sn-RE and other alloy electrodes. However, most of these electrodes have the following problems: (1) Poor mechanical properties, easy to creep and ...

Claims

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Application Information

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IPC IPC(8): C25B11/04
Inventor 赖延清蒋良兴钟晓聪洪波吕晓军郝科涛桂俊峰于枭影李劼刘业翔
Owner CENT SOUTH UNIV
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