Preparation method for anti-corrosion coating on surface of cathode plate for zinc electrolysis

A cathode plate, anti-corrosion technology, applied in the direction of electrode, coating, electrolysis process, etc., can solve the problems of reducing the replacement frequency of aluminum plates, prolonging the life, affecting the electrolysis efficiency, etc., and reducing the frequency of replacing the cathode plate, compactness Good, broad application prospects

Active Publication Date: 2018-11-06
FUZHOU UNIVERSITY
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent (CN2887892Y) proposes a method of coating a layer of anti-corrosion layer on the surface of the neck of the cathode plate and anode plate used for wet electrolytic zinc to prolong the corrosion resistance of the electrolytic zinc cathode and anode plates, but it uses a layer of ring coating Oxygen resin or temperature-resistant and anti-corrosion materials have limited effect on prolonging life, and the average life span is only 60 days
Chinese patent (CN102953093A) proposes a cathode plate anti-corrosion layer for zinc electrowinning and its preparation method, which uses spraying or scraping to coat the part between the easily corroded liquid level line of the cathode plate and the conductive beam. , the anti-corrosion coating composed of the middle layer and the surface layer, the use of the anti-corrosion coating can obviously extend the service life of the cathode plate by 30% to 50%, and reduce the replacement frequency of the aluminum plate, but the coating of polymer materials will have a negative impact on The electrolyte causes pollution, which affects the efficiency of electrolysis

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for anti-corrosion coating on surface of cathode plate for zinc electrolysis
  • Preparation method for anti-corrosion coating on surface of cathode plate for zinc electrolysis
  • Preparation method for anti-corrosion coating on surface of cathode plate for zinc electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Calibration of liquidus line: Select a number of pure aluminum plates used as cathode plates, calibrate the position of their liquid level lines, and delineate the area from the top of the cathode plate to 5cm below the liquid level line as the spraying area;

[0026] (2) Surface treatment of the cathode plate: Clean the surface of the cathode plate with ethanol and acetone in sequence, and then perform sandblasting in the spraying area to remove the oil and oxide film on the surface of the cathode plate, and increase the roughness of the plate surface, thereby increasing the matrix Bond strength of material and coating;

[0027] (3) Powder drying: Dry the zirconia powder with a particle size of 45-75 μm in an oven at 80°C for 2 hours;

[0028] (4) Thermal spraying bonding layer: The thermal spraying technology is used to prepare the bonding layer in the spraying area of ​​the cathode plate;

[0029] (5) Thermal spraying coating: Spray the dried zirconia powder on ...

Embodiment 2

[0034] (1) Calibration of liquidus line: Select a number of pure aluminum plates used as cathode plates, calibrate the position of their liquid level lines, and delineate the area from the top of the cathode plate to 5cm below the liquid level line as the spraying area;

[0035] (2) Surface treatment of the cathode plate: Clean the surface of the cathode plate with ethanol and acetone in sequence, and then perform sandblasting in the spraying area to remove the oil and oxide film on the surface of the cathode plate, and increase the roughness of the plate surface, thereby increasing the matrix Bond strength of material and coating;

[0036] (3) Powder drying: Dry the Hastelloy C-276 powder with a particle size of 25-45 μm in an oven at 80°C for 2 hours;

[0037] (4) Thermal spraying coating: Spray the dried Hastelloy C-276 powder on the spraying area of ​​the cathode plate by thermal spraying technology to form an anti-corrosion coating with a thickness of 150 μm.

[0038] Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method for an anti-corrosion coating on the surface of a cathode plate for zinc electrolysis. According to the preparation method, a layer of ceramic powder or metal alloy powder is sprayed within the area range from the upper end of the pure aluminum cathode plate to 5 cm below a liquid level line, so that the corrosion resistance of the cathode plate is improved, the service life of the cathode plate for zinc electrolysis is prolonged by 2-3 months, the replacing frequency of the cathode plate is reduced, the zinc smelting cost is reduced, and the preparation method has the advantages of economy, high efficiency, wide application prospects and the like; and the coating is proper in thickness and small in stress accumulation, thus density is good, thebonding strength is high, the coating is not prone to falling off in the zinc peeling process, and thus the cathode plate can be used for a long time.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for preparing an anticorrosion coating on the surface of a cathode plate for electrolytic zinc. Background technique [0002] At present, about 80% of the total zinc production in the world is produced by wet process. The cathode plate for wet electrolytic zinc is pure aluminum rolled plate, and the anode plate is made of lead-silver alloy and lead-silver multi-element alloy. The principle of zinc electrowinning is that when a current passes through the electrolyte, zinc ions generate zinc at the cathode, and at the same time OH - Losing two electrons produces oxygen at the anode, and its total electrochemical reaction formula is: . [0003] In recent years, due to the diversification of sources of raw materials in zinc smelters, the proportion of various miscellaneous ores has increased, and the fluctuation of the composition of zinc sulfate elect...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C4/134C23C4/02C23C4/073C23C4/11C25C7/02
CPCC23C4/02C23C4/073C23C4/11C23C4/134C25C7/02
Inventor 李强刘栢伶虞志轩谈耀宏王悦萌
Owner FUZHOU UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap