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Alloy inert anode for aluminium electrolysis and preparation method thereof

An inert anode and aluminum electrolysis technology, which is applied in the field of low-temperature aluminum electrolysis alloy inert anode and its preparation, can solve the problems of increasing anode cost, useless industrial application, thin precious metal coating, etc., to achieve corrosion reduction and long-term stable corrosion Protection, low porosity effect

Inactive Publication Date: 2013-04-03
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this technology has two major defects. On the one hand, the use of precious metals as coating materials greatly increases the cost of the anode. On the other hand, the precious metal coating is too thin to provide long-term stable high-temperature oxidation and corrosion protection for the alloy substrate.
Therefore, the noble metal-coated inert anode is not used for industrial application

Method used

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  • Alloy inert anode for aluminium electrolysis and preparation method thereof

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preparation example Construction

[0026] A kind of preparation method of alloy inert anode for aluminum electrolysis of the present invention, the step of its preparation process comprises:

[0027] (1) Before spraying the alloy inert anode matrix alloy for aluminum electrolysis, clean it with organic matter (such as acetone) to remove oil stains; then use ceramic or metal sand (such as brown corundum sand or steel sand) to sandblast or shot the surface treatment to increase surface roughness;

[0028] (2) The iron-nickel-based alloy powder with a weight ratio of iron and nickel of 1:2 to 2:1 is used as the spraying powder, the content of iron and nickel is more than 90%, and the rest is Al, Cu, Co, Zn, Si, Mn, etc. One or several metal elements of the element, the content is 0-10%. Prepare iron-nickel-based alloy inner coating (thickness: 100μm-200μm) on the alloy surface by plasma spraying method, specific spraying process parameters: spraying voltage 40V-50V, spraying current 400A-500A, main gas flow: 40L / ...

Embodiment 1

[0031] (a) Before spraying the alloy substrate, wash it with acetone to remove oil stains; then use brown corundum sand to sandblast the surface to increase the surface roughness;

[0032] (b) Use iron-nickel alloy powder with a weight ratio of iron and nickel of 1:2 as the spraying powder, and use the plasma spraying method to prepare an iron-nickel alloy inner coating with a thickness of 100 μm on the surface of the alloy substrate. The specific spraying process parameters: spraying Voltage 40V, spraying current 400A, main air flow: 40L / min, auxiliary air flow: 5L / min, powder feeding volume 20g / min, spraying distance 80mm;

[0033] (c) Using nickel ferrite ceramic powder as the spraying powder, the nickel ferrite ceramic powder is sprayed onto the surface of the alloy substrate with an iron-nickel alloy coating by plasma spraying method to prepare a nickel ferrite ceramic outer coating with a thickness of 150 μm Layer, specific spraying process parameters: spraying voltage 4...

Embodiment 2

[0036] (a) Before spraying the alloy substrate, wash it with acetone to remove oil stains; then use brown corundum sand to sandblast the surface to increase the surface roughness;

[0037] (b) Use iron-nickel-aluminum alloy powder with a weight ratio of iron and nickel of 1:2 and 6% aluminum as the spraying powder, and use the plasma spraying method to prepare an inner coating of iron-nickel-aluminum alloy with a thickness of 150 μm on the surface of the alloy substrate Layer, specific spraying process parameters: spraying voltage 45V, spraying current 450A, main air flow: 50L / min, auxiliary air flow: 7.5L / min, powder feeding amount 25g / min, spraying distance 90mm;

[0038] (c) Using nickel aluminate ceramic powder as the spraying powder, the nickel aluminate ceramic powder is sprayed onto the surface of the alloy substrate with iron-nickel-aluminum alloy coating by plasma spraying method to prepare a nickel aluminate ceramic surface with a thickness of 100 μm. Coating, specif...

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Abstract

The invention relates to an alloy inert anode for aluminium electrolysis and a preparation method thereof, and in particular relates to an alloy inert anode for aluminium electrolysis with a high-temperature anti-oxidative and anti-corrosion coat and a preparation method thereof. The alloy inert anode disclosed by the invention structurally comprises an alloy inert anode substrate for the aluminium electrolysis and is characterized in that an inner iron-nickel based alloy coat prepared by utilizing a plasma spray coating method is on the surface of the alloy inert anode substrate for the aluminium electrolysis; and an outer oxide ceramic coat prepared by utilizing the plasma spray coating method is on the surface of the inner iron-nickel based alloy coat. According to the invention, the outer oxide ceramic coat prepared by utilizing the plasma spray coating method is compact in structure and low in porosity and is capable of effectively reducing the corrosion of the alloy inert anode; simultaneously, the inner iron-nickel based alloy coat can be reacted with oxygen entering through diffusion of the outer oxide ceramic coat to form oxide ceramic; oxygen entering the alloy substrate through diffusion is reduced; the corrosion consumption of the outer oxide coat is supplied by reaction generated oxide; and long-term steady corrosion protection is provided for the anode.

Description

technical field [0001] An alloy inert anode for aluminum electrolysis and a preparation method thereof, relating to an alloy inert anode for low-temperature aluminum electrolysis with a high-temperature anti-oxidation and corrosion-resistant coating and a preparation method thereof. Background technique [0002] The current method of producing aluminum in the aluminum industry is to use the Hall-Herout electrolytic cell method, using a self-consumed carbon anode, and its main reaction is: 2Al 2 o 3 +3C=6Al （l） +3CO 2 ↑, in addition to producing a large amount of CO 2 In addition to greenhouse gases, it is often accompanied by carcinogen asphalt fume, acid gas sulfur dioxide and strong greenhouse gas CF n emissions. In addition, because it is a self-consumable anode, the production unit ton of aluminum consumes up to 500kg of high-quality carbon materials. The carbon anode has poor electrical conductivity, low power efficiency, and particularly large power consumption. A...

Claims

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Application Information

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IPC IPC(8): C25C3/12
Inventor 彭伟平吴恒杨建红张建庭
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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