Anti-corrosion and anti-oxidation coating material for electrolytic aluminum anode steel claw and preparation method of anti-corrosion and anti-oxidation coating material

A technology for electrolytic aluminum anodes and coating materials, applied in the field of electrolytic aluminum, can solve the problems of complex protective coating formulations for electrolytic aluminum anodes, loss of the protective function of anode steel claws, adverse effects on the quality of aluminum products, etc. , Easy to mix evenly, stable physical and chemical properties

Active Publication Date: 2021-10-22
HENAN YINGCHUAN NEW MATERIAL INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The formulas of the protective coatings for electrolytic aluminum anodes disclosed above are all more complicated, and in addition to aluminum elements, also contain a large amount of other elements in the raw materials, although the electrodes can be protected from corrosion, they will be released into the electrolyte (melted ice crystals) The introduction of other elements may have adverse effects on the quality of aluminum products (such as the introduction of other impurities, the increase in the amount of impurities leads to a decrease in the purity of aluminum products)
[0010] In addition, the anode protective coating formulations disclosed in prior art 2-5 all contain organic matter (such as acrylic emulsion, glycerin in prior art 2; hydroxyphosphazene resin, organi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The raw materials of the coating material in this embodiment include 50% α-Al by mass percentage 2 o 3 , 20% γ-Al 2 o 3 , 5% aluminum silicate fiber, 25% sodium silicate.

[0037] Take raw material by above content, after mixing, produce coating material sample 1, add the room temperature tap water of coating material sample 1 quality 33wt%, mechanical stirring 5 minutes, adopt scraping mode (also can adopt spraying) in The electrolytic aluminum anode is uniformly painted over 1mm, and after natural drying for 12 hours, a coating is formed on the anode steel claw, and installed in the electrolytic cell for electrolytic aluminum.

[0038] The comparison sample is an anodic steel claw without any coating, which is installed in the electrolytic cell for aluminum electrolysis.

[0039] Take the electrolytic aluminum sample in the electrolytic tank of the coating material sample 1 as the test sample I, and take the electrolytic aluminum sample in the electrolytic tank wh...

Embodiment 2

[0042] The raw materials of the coating material in this embodiment include 65% α-Al by mass percentage 2 o 3 , 5%γ-Al 2 o 3 , 7% aluminum silicate fiber, 23% sodium silicate.

[0043] Take raw material by above content, after mixing uniformly, produce coating material sample 2, add the room temperature tap water of coating material sample 2 quality 33wt%, mechanical stirring 5 minutes, adopt scraping mode (also can adopt spraying) in The electrolytic aluminum anode is uniformly painted over 1mm, and after natural drying for 12 hours, a coating is formed on the anode steel claw, and installed in the electrolytic cell for electrolytic aluminum.

[0044] The comparison is the same as in Example 1.

[0045] Take the electrolytic aluminum sample in the electrolytic tank of the finishing coating material sample 2 as the test sample II, and take the electrolytic aluminum sample in the electrolytic tank where the comparison sample is installed as the comparative sample.

[0046]...

Embodiment 3

[0048] The raw materials of the coating material in this embodiment include 40% α-Al by mass percentage 2 o 3 , 30% γ-Al 2 o 3 , 7% aluminum silicate fiber, 23% sodium silicate.

[0049] Take raw material by above content, after mixing, produce coating material sample 3, add the room temperature tap water of coating material sample 3 quality 33wt%, mechanical stirring 5 minutes, adopt scraping mode (also can adopt spraying) in The electrolytic aluminum anode is uniformly painted over 1mm, and after natural drying for 12 hours, a coating is formed on the anode steel claw, and installed in the electrolytic cell for electrolytic aluminum.

[0050] The comparison is the same as in Example 1.

[0051] Take the electrolytic aluminum sample in the electrolytic tank of the finishing coating material sample 3 as the test sample III, and take the electrolytic aluminum sample in the electrolytic tank with the comparative sample as the comparative sample.

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PUM

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Abstract

The invention discloses an anti-corrosion and anti-oxidation coating material for an electrolytic aluminum anode steel claw and a preparation method of the anti-corrosion and anti-oxidation coating material, and the anti-corrosion and anti-oxidation coating material comprises the following raw materials in percentage by mass: 40-70% of alpha-Al2O3, 0-30% of gamma-Al2O3 (preferably 5-30%), 2-7% of aluminum silicate fiber and 20-30% of water glass. Various aluminum oxides are used in the raw materials of the anti-corrosion and anti-oxidation coating material for the electrolytic aluminum anode steel claw to the maximum extent, only a small amount of aluminum oxides are contained, other elements can be prevented from entering an electrolyte, and therefore the influence on the quality of an aluminum product is avoided. The coating material is compact in structure, the permeation amount of corrosive gas can be reduced, the corrosion rate of an electrode can be obviously reduced, the corrosion resistance is high, and the wear resistance is good. The coating material disclosed by the invention is enhanced in ductility, suitable for a high-temperature environment, and not easy to crack and fall off when being used in the high-temperature environment.

Description

technical field [0001] The invention relates to the technical field of electrolytic aluminum, in particular to an anti-corrosion and anti-oxidation coating material for electrolytic aluminum anode steel claws and a preparation method thereof. Background technique [0002] The production of electrolytic aluminum in modern industry mainly adopts the cryolite-alumina molten salt electrolysis method, that is, the carbon body is used as the anode (since the carbon body is connected to one end of the steel claw, and the other end of the steel claw is connected to the DC power supply, Therefore, it is commonly known as "anode steel claw"), using molten cryolite as the electrolyte, using the molten metal aluminum dissolved in the electrolyte as the cathode, and passing direct current to the two poles. Electrochemical reaction is carried out to obtain metallic aluminum products. [0003] Only the carbon body part of the anode steel claw is in contact with the electrolyte, and the st...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/08C09D7/61
CPCC09D1/00C09D5/08C09D7/61C09D7/70C09D5/18
Inventor 芦亚楠黄强芦永军韩飞张树奇沈红民王银娟
Owner HENAN YINGCHUAN NEW MATERIAL INC
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