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Method of preparing fluorine-containing lead dioxide electrode on titanium basal body

A technology of lead dioxide and titanium substrates, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of short life, large internal stress, roughness, etc., to improve the bonding force of the coating, ease the distortion of the electrodeposition, and improve the use of The effect of longevity

Inactive Publication Date: 2007-10-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1960s, H.Beer et al proposed Ti / RuO 2 The electrode has been successfully applied in the field of chlor-alkali industry, but it is not suitable for widespread use due to its high price and low oxygen evolution overpotential
But the PbO obtained by electroplating in this way 2 As an insoluble anode, the electrode is often not stable enough in use. The main problems are: (1) PbO 2 The deposition layer is not tightly combined with the electrode surface or the deposition layer is uneven; (2) PbO 2 The deposited layer is porous and rough, with large internal stress; (3) PbO 2 The deposited layer is easy to peel off or corrode, and the service life is not long
[0005] Patent CN1031725 proposes a method for manufacturing ABS plastic-based lead dioxide electrodes; patent CN93115160 adopts an electrolytic method to prepare high-purity active lead dioxide, which can be used as a positive electrode additive for various lead-acid batteries, which can shorten the formation time and increase the initial capacity of the battery. And without any side effect; Patent CN1073747 has reported a kind of active lead dioxide electrode of titanium matrix and its preparation method and application; Patent CN2136250 has studied the manufacturing process of mesh plate type porcelain base lead dioxide electrode, and the coating that these patents obtain is all β-PbO 2 coating, but there are key problems of large internal stress and poor corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Titanium plate (50mm×100mm) is sprayed with quartz sand to roughen the surface, degreased with 0.1mol / L NaOH solution to remove oil stains, washed with distilled water for 2 to 3 times, in saturated oxalic acid solution (solvent is 25% hydrochloric acid), at 80°C Etch for 30min and clean it with water; then thermally decompose the bottom layer of tin-plated antimony oxide (the composition of the coating solution is: 32gSbCl 3 , 150gSnCl 4 ·5H 2 O, 50ml 37wt% concentrated HCl, 300ml n-C 4 h 9 OH). The coating solution is uniformly coated on the surface of the titanium plate by soaking and centrifuging, baked under an infrared lamp for 30 minutes, repeats the coating and drying steps 5 times, and then performs high-temperature thermal decomposition in a muffle furnace at 500°C for 2 hours, repeats coating Cover drying and high-temperature pyrolysis once to obtain a titanium plate with a uniform surface and a dark blue tin-antimony oxide coating, and clean it.

[0036...

Embodiment 2

[0039] According to the electroplating process of Example 1, the fluorine-containing lead dioxide electrode is electroplated, and the bottom layer of the tin-plated antimony oxide is not coated, and the surface of the titanium substrate cleaned after degreasing is directly alkaline-plated with α-PbO 2 Plating layer; then acid plating fluorine-containing β-PbO 2 Coating, measure the interface resistance of the two coatings, the interface resistance of the lead dioxide electrode coated with tin antimony oxide bottom layer is only 30 to 50 / 1 / 50 of the lead dioxide electrode with tin-free antimony oxide bottom layer; use 100A / dm 2 The current density is used to carry out the enhanced life test, the temperature of the electrolyte is controlled at 60°C, and the H of 9mol / L 2 SO 4 Continuous electrolysis in the solution measured the weight loss and surface changes of the test electrodes, and found that the corrosion rates of the two were similar at the beginning, but the fluorine-co...

Embodiment 3

[0041] Electroplate the fluorine-containing lead dioxide electrode by the electroplating process of embodiment 1, but after coating the tin antimony oxide bottom layer, directly plate the fluorine-containing β-PbO 2 Plating, remove alkaline plating α-PbO 2 Coating this step; The electrode prepared in this embodiment is at 100A / dm 2 The enhanced life test is carried out under the current density, the electrolyte temperature is controlled at 60°C, and the H 2 SO 4 Continuous electrolysis in the solution, measuring the weight loss and surface changes of the electrode, found no α-PbO 2 The fluorine-containing lead dioxide electrode in the middle coating is extremely easy to peel off and corrodes very quickly.

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Abstract

The present invention relates to a process for preparing fluorine containing lead dioxide electrode at titanium substrate. The plating structural of said fluorine containing lead dioxide electrode is as follows: from the titanium substrate surface and from inner to outer, in sequences, there are plated the tin-stibium oxidate bottom layer, alpha-PbO2 layer and fluorine contain containing beta- PbO2 layer. Said method comprises the steps of surface roughening treatment of titanium substrate, then plating the tin-stibium oxidate bottom layer through a thermal decomposition method, and then obtaining titanium substrate fluorine containing beta- PbO2 electrode through alkaline electric plating alpha-PbO2 and acidic composite electric plating beta- PbO2.The fluorine containing lead dioxide electrode prepared through the process and method in accordance with the present invention possesses strong bonding force between the plating layer and the substrate, small limiting surface electric resistance and inner stress, low price amd long service lifetime of electrode, can be applied widely in electrolytic industry fields of acidic system.

Description

(1) Technical field [0001] The invention relates to a method for preparing a fluorine-containing lead dioxide electrode on a titanium substrate. (2) Background technology [0002] The anode materials used in the industry used lead electrodes as electrolytic anodes for a long time before the appearance of coated electrodes. Due to the disadvantages of high energy consumption, low strength, and impure anode products, Pb-Ag and Pb were developed later. -Ag-Sb, Pb-Ag-rare earth and other lead alloy electrodes have been applied in industry. In the 1960s, H.Beer et al proposed Ti / RuO 2 The electrode has been successfully applied in the field of chlor-alkali industry, but it is not suitable for widespread use due to its high price and low oxygen evolution overpotential. [0003] Titanium-based PbO 2 The electrode has the advantages of low cost, good corrosion resistance, and high oxygen evolution potential. It has been applied in the electrolysis industry of inorganic salts such...

Claims

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Application Information

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IPC IPC(8): C25B11/10
Inventor 马淳安褚有群赵峰鸣盛江峰
Owner ZHEJIANG UNIV OF TECH
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