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Preparation method of anticorrosive coating on surface of electrolytic zinc anode plate

An anti-corrosion coating and anode plate technology, applied in the direction of electrodes, coatings, electrolysis process, etc., can solve the problems of aggravating the corrosion of the anode liquid phase position, reducing the service life of the anode plate, and increasing the lead content of zinc, etc., to achieve good application Benefits, extended service life, and good compactness

Active Publication Date: 2018-11-06
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chloride ions in the solution will react with the lead anode plate, causing corrosion of the anode plate, reducing the service life of the anode plate, and the lead dissolved in the electrolyte will increase the lead content in the precipitated zinc; at the same time, the lead in the anode plate Ag is also oxidized to Ag + It enters the electrolyte and precipitates at the cathode, and forms a Zn-Ag primary battery with Zn, which is harmful to zinc electrolysis
On the other hand, due to the generation of oxygen at the anode, the continuous precipitation of gas causes the fluctuation of the liquid phase surface, which impacts the position of the anode liquid phase surface. This long-term fluctuation and beating aggravates the corrosion of the anode liquid phase position.

Method used

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  • Preparation method of anticorrosive coating on surface of electrolytic zinc anode plate
  • Preparation method of anticorrosive coating on surface of electrolytic zinc anode plate
  • Preparation method of anticorrosive coating on surface of electrolytic zinc anode plate

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Embodiment 1

[0027] (1) Select the lead-silver binary alloy (0.6% silver content) used as the anode plate, and calibrate the position of its liquid level line;

[0028] (2) First carefully wipe the surface of the anode plate with ethanol for 10 minutes, then rinse with water, then wipe the surface with acetone for 15 minutes, and rinse with water;

[0029] (3) Delineate the area from the top of the anode plate to 5cm below the liquid level line as the spraying area, and perform sandblasting on the spraying area; the pressure during sandblasting is 0.3MPa-0.5MPa, and the gap between the nozzle and the anode plate surface The angle is 15°-60°, in order to avoid the impact of strong grit on the surface of the anode plate;

[0030] (4) Select NiCoCrAlY powder as the bonding layer material, and zirconia powder with a particle size of 45-75 μm as the spraying material; place NiCoCrAlY powder and zirconia powder in an oven for 5 hours at 80°C;

[0031] (5) Spray a bonding layer with a thickness ...

Embodiment 2

[0035] (1) Select the lead-silver binary alloy (0.6% silver content) used as the anode plate, and calibrate the position of its liquid level line;

[0036] (2) First carefully wipe the surface of the anode plate with ethanol for 10 minutes, then rinse with water, then wipe the surface with acetone for 15 minutes, and rinse with water;

[0037] (3) Delineate the area from the top of the anode plate to 5cm below the liquid level line as the spraying area, and perform sandblasting on the spraying area; the pressure during sandblasting is 0.3MPa-0.5MPa, and the gap between the nozzle and the anode plate surface The angle is 15°-60°, in order to avoid the impact of strong grit on the surface of the anode plate;

[0038] (4) Select Hastelloy C-276 powder as the spraying material, and place the powder in an oven at 80°C for 5 hours;

[0039] (5) Use the plasma spraying method to spray a layer of Hastelloy C-276 coating with a thickness of 150 μm on the sandblasting area after sandbl...

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Abstract

The invention discloses an anticorrosive coating on surface of an electrolytic (deposited) zinc anode plate and a preparation method thereof. The method comprises the step that a spraying material resistant to sulfuric acid solution, fluoride ion and chloride ion corrosion is sprayed in a range from the upper end of the anode plate to 5 cm below a liquid level line so as to obtain the anticorrosive anode plate with a coating. The spraying material selected in the anticorrosive coating on the surface of an electrolytic (deposited) zinc anode plate and the preparation method thereof is sprayed on the anode plate, the electrolytic efficiency of zinc is not affected, the corrosion of the polar plate is effectively slowed down, so that the service life of the anode plate is prolonged by 2-3 months. The preparation method has small investment, simple process flow, no special requirements on equipment, low energy consumption, no pollution and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to an anti-corrosion coating on the surface of an electrolytic (build-up) zinc anode plate and a preparation method thereof. Background technique [0002] At room temperature, a protective film is easily formed on the surface of zinc, which has excellent atmospheric corrosion resistance. Therefore, zinc is mainly used for the surface coating of steel and steel structural parts (such as galvanized sheet), involving automobiles, construction, ships, light industry, etc. Many industries. In recent years, with the continuous development of the energy storage industry, especially the continuous investment in technologies such as zinc-manganese batteries and zinc-air batteries, zinc has been widely used in the battery industry. [0003] Generally, there are three methods for preparing zinc: one is to calcinate sphalerite or sphalerite in the air to form zinc oxide, an...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/02C23C4/073C23C4/11C25C7/02
CPCC23C4/02C23C4/073C23C4/11C23C4/134C25C7/02
Inventor 李强谈耀宏刘栢伶虞志轩
Owner FUZHOU UNIVERSITY
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