A kind of surface treatment method of aluminum electrolytic inert anode

An inert anode, surface treatment technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of poor uniformity, small oxide film thickness, high porosity, and achieve good resistance to aluminum electrolytic fluoride melting. Salt corrosion performance, good structural integrity, improved high temperature oxidation resistance

Active Publication Date: 2016-11-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method capable of forming an oxide film with good resistance to the problems of high porosity and poor uniformity in the direct spraying method in view of the small thickness of the oxide film on the surface of the material surface of the direct oxidation method in the above-mentioned prior art, long time and low efficiency; direct spraying has problems such as high porosity and poor uniformity Surface treatment method of aluminum electrolytic inert anode with ceramic oxide film with high temperature oxidation and molten salt corrosion resistance

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  • A kind of surface treatment method of aluminum electrolytic inert anode
  • A kind of surface treatment method of aluminum electrolytic inert anode

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Experimental program
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Effect test

Embodiment 1

[0035] The surface of the cast-formed anode is firstly sandblasted to remove the surface oxide skin, and at the same time make the surface roughness reach Sa2.5~3.0 level. The surface of the anode was sprayed by plasma spraying, in which the inner coating was composed of Fe-Ni alloy powder with a weight ratio of 1:1, and 6% Cu powder was added to prepare an alloy inner coating with a thickness of 80 μm. The outer coating becomes mainly NiFe 2 o 4 Ceramic powder, and add 10% NiO ceramic powder, 5% Co powder, 0.5% La powder to prepare a ceramic-metal protective layer with a thickness of 100 μm.

[0036] The sprayed anode is placed in a horizontal muffle furnace for high-temperature oxidation treatment, the temperature rise rate is controlled: 8°C / min, the oxidation holding temperature: 800°C, the oxidation time: 24h, the holding oxygen pressure is 0.8atm, and the temperature is 4°C / min After slowly cooling down to 400°C, cool down to room temperature with the furnace. After s...

Embodiment 2

[0039] The surface of the cast-formed anode is firstly sandblasted to remove the surface oxide skin, and at the same time make the surface roughness reach Sa2.5~3.0 level. The surface of the anode was sprayed by plasma spraying, in which the composition of the inner coating was Fe-Ni alloy powder with a weight ratio of 1:2, and 2Al% powder was added to prepare an alloy inner coating with a thickness of 50 μm. The outer coating becomes mainly NiFe 2 o 4 Ceramic powder, and add 10% Fe 2 o 3 Ceramic powder and 2% Zn powder were used to prepare a ceramic-metal protective layer with a thickness of 120 μm.

[0040] The sprayed anode is placed in a horizontal muffle furnace for high-temperature oxidation treatment, the temperature rise rate is controlled: 10°C / min, the oxidation holding temperature: 950°C, the oxidation time: 0.5h, the holding oxygen pressure is 0.5atm, and the temperature is 5°C / min. min Slowly cool down to 450°C, then cool down to room temperature with the furn...

Embodiment 3

[0043] The surface of the cast-formed anode is firstly sandblasted to remove the surface oxide skin, and at the same time make the surface roughness reach Sa2.5~3.0 level. The surface of the anode is sprayed by plasma spraying, in which the composition of the inner coating is Fe-Ni alloy powder with a weight ratio of 2:1, and 5% Cu powder and 5% Co powder are added to prepare an alloy inner coating with a thickness of 50 μm. layer. The outer coating becomes mainly NiFe 2 o 4 Ceramic powder, and add 10% NiO ceramic powder, 2% Mn powder, 2% Co powder to prepare a ceramic-metal protective layer with a thickness of 150 μm.

[0044] The sprayed anode is placed in a horizontal muffle furnace for high-temperature oxidation treatment, controlled heating rate: 5°C / min, oxidation holding temperature: 880°C, oxidation time: 2.5h, holding oxygen pressure 1atm, at 3°C / min After slowly cooling down to 500°C, cool down to room temperature with the furnace. After spraying + high temperatu...

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Abstract

The invention relates to a surface treatment method for an aluminum electrolyzing inert anode. The surface treatment method is characterized by comprising the following steps: firstly, forming a protective layer on the surface of a Ni-Fe-based inert anode through spray coating, wherein the protective layer consists of a bottom layer Fe-Ni-X1 alloy layer and an outer layer Fe-Ni-X2-O ceramic-metal layer; secondly, sealing holes of the protective layer through a high-temperature oxidation method to form a uniform and compact oxide film layer, wherein the oxide film can improve high-temperature oxidation resistance and molten salt corrosion resistance of the anode; the inert anode subjected to coating and oxidation has good high-temperature oxidation resistance and aluminum electrolyzing fluoride molten salt corrosion resistance; after being subjected to electrolyzing molten salt corrosion for 300 hours, the inert anode still keep good structural integrity.

Description

technical field [0001] The invention discloses a surface treatment method for an aluminum electrolytic inert anode, and relates to a surface treatment method for an aluminum electrolytic inert anode. Background technique [0002] As the non-ferrous metal with the largest output, aluminum is an important pillar industry of my country's national economy. With the development of the national economy and the continuous improvement of people's living standards, the demand for aluminum will continue to grow. The current Hall-Herout aluminum electrolytic cell uses carbon anodes and cathodes. The DC power consumption per ton of aluminum is as high as 13200kWh, and the power efficiency is lower than 50%. At the same time, it consumes 500kg of high-quality carbon materials. Huge energy consumption, resource consumption and environmental load are seriously restricting aluminum electrolysis. In the development of industry, energy saving, consumption reduction and pollution reduction ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12C23C4/04C23C4/18
Inventor 李冬生彭伟平杨建红吴恒张建庭
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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