CN101386995A - Aluminum electrolysis carbon anode oxidation coating and coating method thereof - Google Patents
Aluminum electrolysis carbon anode oxidation coating and coating method thereof Download PDFInfo
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- CN101386995A CN101386995A CNA2008102248082A CN200810224808A CN101386995A CN 101386995 A CN101386995 A CN 101386995A CN A2008102248082 A CNA2008102248082 A CN A2008102248082A CN 200810224808 A CN200810224808 A CN 200810224808A CN 101386995 A CN101386995 A CN 101386995A
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- 238000000576 coating method Methods 0.000 title claims abstract description 195
- 239000011248 coating agent Substances 0.000 title claims abstract description 184
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 70
- 230000003647 oxidation Effects 0.000 title claims abstract description 66
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 66
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 46
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000005868 electrolysis reaction Methods 0.000 title claims description 44
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229930185605 Bisphenol Natural products 0.000 claims abstract description 15
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003822 epoxy resin Substances 0.000 claims abstract description 15
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 15
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004327 boric acid Substances 0.000 claims abstract description 10
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 9
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims abstract description 9
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims description 38
- 238000002360 preparation method Methods 0.000 claims description 21
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 claims description 16
- 239000013530 defoamer Substances 0.000 claims description 16
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 229910052810 boron oxide Inorganic materials 0.000 claims description 11
- 238000010926 purge Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 5
- 229910011255 B2O3 Inorganic materials 0.000 abstract 1
- 239000006260 foam Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 23
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- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 7
- 238000000280 densification Methods 0.000 description 7
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
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- 229910052760 oxygen Inorganic materials 0.000 description 3
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- 239000011347 resin Substances 0.000 description 2
- -1 15wt% norbide Chemical compound 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
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Abstract
The invention relates to an oxidation resistant coating for aluminum electrolytic carbon anode and a coating method thereof. The method is characterized in that the surface of the aluminum electrolytic carbon anode is provided with an anti-oxidation coating formed by dried and mixed coat which is sprayed on the surface of the electrode, wherein the mixed coat comprises the following compositions in weight percentage: 1 to 25 percent of bisphenol A-type waterborne epoxy resin, 0.1 to 16 percent of boron carbide, 2 to 13 percent of boric acid and/or boric oxide, 15 to 50 percent of alumina, 0 to 20 percent of pseudo-boehmite, 10 to 30 percent of alumina sol, 0.1 to 0.3 percent of foam suppressor, and the balance being water. The coating and the method adopt an alumina-based gradient boron carbide oxidation resistant coating with a multilayer structure, and effectively blocks the contact of air and CO2 with carbon anode carbon, thereby avoiding or reducing excessive consumption of the carbon anode carbon. The method can realize carbon conservation by aluminum electrolytic prebaked anode by 10 to 20 kilogram/ton-Al.
Description
Technical field
The present invention relates to a kind of aluminum electrolysis carbon anode oxidation coating and coating method thereof.
Background technology
In the Aluminium Electrolysis process, carbon annode had both been born electric action, participated in electrochemical reaction again, constantly consumed, and technico-economical comparison and primary aluminum quality are all had very significant effects, therefore was called as " heart " of aluminium cell.Carbon annode consumption is one of chief component of primary aluminum production cost, accounts for total cost 15%.
At present, electrolysis of aluminum enterprise can reduce following several measures for the technical work of the oxidation-resistance that improves carbon annode, reduction carbon consumption index both at home and abroad: (1) improves the quality of production of carbon anode, strengthen the management of electrolyzer technological operation and technical qualification, make the further steadily efficient operation of electrolyzer.(2) be aluminum current electrolysis plant method commonly used with alumina raw material as protective cover, still loose, uneven alumina layer can not guarantee that carbon and air completely cut off.(3) the part electrolytic aluminium plant protective layer of molten aluminum as carbon anode, but there is problem economically in this method.Need 0.8～1.0g/cm at anode surface
2Aluminium, aluminium and carbon nonwetting cause coating inhomogeneous, come off, not only consumed aluminium but also can not prevent the oxidation of blocking.(4) carbon anode is carried out modification, adopt suitable additive to reduce the oxidized active method of anode, do not see industrial applications.All there is the limitation of technology or economic aspect in these measures.
Both economical effective means is at carbon annode surface-coated one deck compound anti-oxidation film (coating).Play and reduce because CO
2The effect of the prebaked anode excess carbon consumption that causes with air combustion; The existence of this oxidation resistant coating simultaneously is the thickness of attenuate anode block upper caldding layer suitably, is beneficial to satisfy the requirement of large pre-baked cell top heat radiation; Therefore the overheated oxidation that causes of top carbon piece that causes owing to tectum is blocked up also can obtain reducing.Effectively oxidation resistant coating can reduce the anode luxus consumption, can increase heat radiation at the thickness of attenuate anode top insulation material again, optimizes the electrolyzer thermal field, keeps electrolyzer thermal equilibrium, and steadily Aluminium Electrolysis increases cell life.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, and a kind of blocks air effectively and CO are provided
2With contacting of carbon annode carbon, avoid or reduce the luxus consumption of carbon annode carbon, prolong the aluminum electrolysis carbon anode oxidation coating and the coating method thereof in carbon anode life-span.
The objective of the invention is to be achieved through the following technical solutions.
A kind of aluminum electrolysis carbon anode oxidation coating, it is characterized in that having on electrolysis of aluminum carbon annode surface by the boric acid of forming the aqueous epoxy resins that comprises 1%-25% bisphenol A-type, 0.1%-16% norbide, 2%-13% through weight percent and/or boron oxide, 15%-50% aluminum oxide, the pseudo-boehmite of 0%-20%, 10%-30% alumina sol, 0.1%-0.3% defoamer, surplus is that the compo of water is sprayed at electrode surface, the dry oxidation resistant coating that forms.
A kind of aluminum electrolysis carbon anode oxidation coating of the present invention, it is characterized in that described oxidation resistant coating is the oxidation resistant coating that the branch several times are sprayed at electrode surface, drying formation, and be sprayed at electrode surface coating from the inside to the outside, norbide contains successively and successively decreases in its compo composition.
A kind of electrolysis of aluminum carbon annode that has oxidation resistant coating of the present invention, the thickness that it is characterized in that described oxidation resistant coating is 0.1-0.2mm
A kind of electrolysis of aluminum carbon annode that has oxidation resistant coating of the present invention is characterized in that described oxidation resistant coating is the oxidation resistant coating that branch is sprayed at electrode surface, drying formation for three times.
A kind of electrolysis of aluminum carbon annode that has oxidation resistant coating of the present invention is characterized in that described oxidation resistant coating is the oxidation resistant coating that branch is sprayed at electrode surface, drying formation for four times.
A kind of electrolysis of aluminum carbon annode that has oxidation resistant coating of the present invention is characterized in that described oxidation resistant coating is the oxidation resistant coating that branch is sprayed at electrode surface, drying formation for five times.
A kind of coating method of aluminum electrolysis carbon anode oxidation coating is characterized in that its coating procedure comprises:
(1) coating of preparation coating;
(2) cleaning carbon annode surface; With high-pressure air purge carbon annode surface, make the carbon annode surface cleaning dustless;
(3) carbon annode after will cleaning lifts to the casing of spraying equipment, adopts box multiple gun fast spraying method that coating is sprayed at anode surface successively.
The coating method of a kind of aluminum electrolysis carbon anode oxidation coating of the present invention, when it is characterized in that spraying the branch several times and being sprayed at the oxidation resistant coating that electrode surface, drying form, at first the highest coating of spray coating boron carbide content is coated with the lower coating of norbide content then.
Method of the present invention is utilized B
4C reaction at high temperature, allow norbide content change in gradient, give full play to the physical properties of each different layer of norbide content under differing temps and the variation characteristic of chemical property, and the online anti oxidation layer that forms densification of the high temperature that utilizes the Aluminium Electrolysis process to produce.B
4C is 600 ℃ of beginning oxidations in air, B
4The chemical equation of oxygen is in C and the air: B
4C+4O
2=2B
2O
3+ CO
2↑, the B that reaction generates
2O
3Be molten state at high temperature, have certain fluidity and the wettability good to carbon base body, and molten state can well be filled into the crackle and the hole of coatingsurface, can make the crackle that produces in the coating up, and in its generative process, be attended by 250% volumetric expansion, the passage of oxidizing gas to the carbon annode surface diffusion reduced in the crack that the coating that can heal causes because of volumetric shrinkage effectively, thereby strengthened changing anti-oxidation of coating.
A kind of electrolysis of aluminum carbon annode that has oxidation resistant coating of the present invention; aluminium electrolysis pre-baking carbon annode surface-coated has the anti-oxidant function coating; and norbide content successively reduces the formation gradient; under the heat effect of aluminium cell self; utilize norbide under high-temperature oxidation environment, can form the protective layer of compact structure; form by the content that changes norbide in each layer of multilayered structure coating, the variation that makes the thing of norbide under differing temps reach the structure of matter mutually obtains reasonable use.On the other hand, adopted structure formation at the anode surface spraying multi-layer coatings, utilize norbide diffustivity at high temperature, its volatilization is effectively absorbed by superstructure in multilayered structure, reduce the loss of norbide pyritous, guaranteed the effective constituent of norbide in the coating, the oxidation-resistance of coating can be kept for a long time.
A kind of preparation that has the electrolysis of aluminum carbon annode of oxidation resistant coating of the present invention can place casing with the electrolysis of aluminum carbon annode, by on box body wall, run through the spray gun that is provided with the coating fast spraying on aluminium electrolysis pre-baking carbon annode surface, regulate the material spray of different ingredients, form gradient norbide anti-oxidant function coating, make norbide content successively reduce the formation gradient, spraying back seasoning forms oxidation resistant coating on electrolysis of aluminum carbon annode surface.In the electrolytic process, rely on the heat of aluminium cell self, the alumina base gradient norbide anti-oxidant function coating of online formation densification, thus stopped air and CO effectively
2With contacting of carbon annode carbon, avoid or reduce the luxus consumption of carbon annode carbon.
Description of drawings
Fig. 1 is the coating equipment structural representation of a kind of aluminum electrolysis carbon anode oxidation coating of the present invention.
Embodiment
A kind of aluminum electrolysis carbon anode oxidation coating, having its oxidation resistant coating of oxidation resistant coating on electrolysis of aluminum carbon annode surface is the oxidation resistant coating that the branch several times are sprayed at electrode surface, drying formation, the thickness of oxidation resistant coating is 0.1-0.2mm; And be sprayed at electrode surface coating from the inside to the outside, norbide contains successively and successively decreases in its compo composition.
Formulation for coating material of the present invention is as table
Table 1
Several times are sprayed at the composition of electrode surface:
The solid content of alumina sol is the dried solid residual volume of colloidal sol in the coating, and defoamer is that conventional coating assisting agents gets final product, so long as in the classification of defoamer, belong to water-based, and all can the using of non-silicon class.
Preparation process is as follows:
(1) the different coating of forming alumina base norbide anti-oxidant function coating of preparation.Adjust the component and the content, the particularly content of additive norbide of coated coating, obtain the different coated coating of norbide content.
(2) cleaning carbon annode surface.With high-pressure air purge carbon annode surface, make the carbon annode surface cleaning dustless.
(3) preparation alumina base gradient norbide anti-oxidant function coating.Carbon annode after the cleaning is lifted to the casing of spraying equipment, and the coating that adopts box multiple gun fast spraying method that difference is formed is sprayed at anode surface successively, and air pressure is 8-12KPa, each spraying 1 hour at interval.At first the highest coating of spray coating boron carbide content is coated with the lower coating of norbide content then.In spraying process, the consumption of every coating is controlled at 0.05～0.10g/cm
2Along with the increase of the number of times of sprayed coating, the norbide content in the coating that is sprayed reduces gradually, and norbide content is changed in gradient.After the coating seasoning, the anode that is sprayed with coating is used for producing the online alumina base gradient norbide anti-oxidant function coating that forms densification of the heat that utilizes the Aluminium Electrolysis process to produce.
The Working environment of electrolysis of aluminum carbon annode is the high temperature aluminum electrolyzer, and according to the temperature distribution situation of aluminium cell, the temperature of anode temperature that makes progress from the bottom reduces gradually, and bottom temp is greatly about 950 ℃, and head temperature is about 450 ℃.According to the distribution of the temperature of aluminium cell, this coating technology adopts multilayered structure, utilizes B
4C reaction at high temperature, allow norbide content change in gradient, give full play to the physical properties of each different layer of norbide content under differing temps and the variation characteristic of chemical property, and the online anti oxidation layer that forms densification of the high temperature that utilizes the Aluminium Electrolysis process to produce.B
4C is 600 ℃ of beginning oxidations in air, 900 ℃ of rapid oxidations, B
4The chemical equation of oxygen is in C and the air: B
4C+4O
2=2B
2O
3+ CO
2↑, the B that reaction generates
2O
3Be molten state at high temperature, have certain fluidity and the wettability good, can make the crackle that produces in the coating up, and in its generative process, be attended by 250% volumetric expansion, the crack that the coating that can heal causes because of volumetric shrinkage carbon base body.In certain degree, B in the coating
4C content is high more, and this effect of making up is just strong more.But, B at high temperature
2O
3Can gasify, if there is not obstacle, it can leave coating, and stays the cavity, thereby influences the oxidation-resistance of coating.Gradient B
4The multilayered structure of C, each layer all are the protective layers of preceding one deck, can not only improve the intensity of coating, can also be with B
4The B that C and oxygen reaction produced
2O
3Stay and form tight zone in the coating, stop or slow down air, CO
2With the carbon annode reaction, thereby make coating at high temperature still can play antioxygenation.
According to the requirement of primary aluminum product, coating material all adopts the starting material that use in the Aluminium Electrolysis process and allows additive, mainly is external phase with the alumina sol, and aluminum oxide is a main stuffing, can not cause detrimentally affect to aluminium cell and primary aluminum quality.In addition, also add a certain amount of resin, the adding of resin can improve the sticking power of coating and carbon base body, and additives such as alumina sol, aluminum oxide and norbide form fine and close gradient boron carbide coating in the pyroprocess, have stopped air and CO effectively
2With contacting of anode carbon.This invention not only has distinctive feature on prescription, also adopted box multiple gun fast spraying equipment on coating method.This spraying method is that the anode that will assemble hangs in the casing, can be simultaneously fast with the oxidation resistant coating paint spay-coating in five faces of anodic (removing anode bottom face), thereby avoided the harm of conventional aerial spraying method paint loss and dust to operator, and can save and be coated with ETL estimated time of loading, reduce labor intensity.This spraying method is convenient and swift, and equipment is simple, is convenient to realize industrial applications.Adopt the alumina base gradient norbide oxidation resistant coating of multilayered structure can realize aluminium electrolysis prebaked anode joint carbon 10-20kg/t-Al.
Embodiment 1 (three-decker)
1) preparation of the first layer coating:, mix under the normal temperature and be prepared into coating paste with 27.6wt% water, 20.7wt% bisphenol A-type aqueous epoxy resins, 15wt% norbide, boric acid 2.2wt%, 24.1wt% aluminum oxide, 10.3wt% solid content alumina sol and 0.1wt%DF568 defoamer greater than 5wt%;
2) preparation of second layer coating:, mix under the normal temperature and be prepared into coating paste with 28.0wt% water, 8.8wt% bisphenol A-type aqueous epoxy resins, 9wt% norbide, 6wt% boric acid, 26.8wt% aluminum oxide, 6.3wt% pseudo-boehmite, 15wt% solid content alumina sol and 0.1wt%DF568 defoamer greater than 5wt%;
3) preparation of the 3rd coating:, mix under the normal temperature and be prepared into coating paste with 22.0wt% water, 3.7wt% bisphenol A-type aqueous epoxy resins, 4.5wt% norbide, 7.4wt% boron oxide, 44.8wt% aluminum oxide, 17.5wt% solid content alumina sol and 0.1wt%DF568 defoamer greater than 5wt%.
4) anode surface cleans.The carbon annode 1 that assembles is allocated and transported to the paint coating scene, adopted high-pressure air purge anode surface, remove the floating dust of anode spraying face, avoid occurring sticking behind the sprayed coating not firm, delamination occurs.
5) paint coating.As shown in Figure 1, carbon annode after the cleaning is lifted to the casing of spraying equipment, and the coating that adopts box many spray guns 2 fast spraying methods that difference is formed is sprayed at anode surface successively, and air pressure is 8-12KPa, each spraying 1 hour at interval, 3 for reclaiming coating.The highest coating of spray coating boron carbide content at first, be coated with the lower coating of norbide content then, promptly by the coating 1 of the foregoing description 1 preparation), 2), 3) order spray successively, increase along with the number of times of sprayed coating, norbide content in the coating that is sprayed reduces gradually, and norbide content is changed in gradient.Finish the spraying operation of three layers of coating, the coating seasoning.
6) anode that scribbles coating after the drying is used for produce the online alumina base gradient norbide anti-oxidant function coating that forms densification of the heat that utilizes the Aluminium Electrolysis process to produce.According to application result, three-decker alumina base gradient norbide oxidation resistant coating realizes saving carbon consumption 10kg/t-Al.
Embodiment 2:(four-layer structure)
1) preparation of the first layer coating: with 29.4wt% water, 20.4wt% bisphenol A-type aqueous epoxy resins, 14.7wt% norbide, 5.9wt% boron oxide, 17.6wt% aluminum oxide, 11.9wt% content is alumina sol and the 0.1wt%DF558 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
2) preparation of second layer coating: with 25.0wt% water, 12.5wt% bisphenol A-type aqueous epoxy resins, 8.0wt% norbide, 26.4wt% aluminum oxide, 5.0wt% boron oxide, 7.5wt% pseudo-boehmite, 15.5wt% solid content is alumina sol and the 0.1wt%DF558 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
3) preparation of the 3rd coating: with 33.0wt% water, 10.0wt% bisphenol A-type aqueous epoxy resins, 5.0wt% norbide, 8.0wt% boron oxide, 28.0wt% aluminum oxide, 5.9wt% pseudo-boehmite, 10.0wt% solid content is alumina sol and the 0.1wt%DF558 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
4) preparation of the 4th coating: with 21.9wt% water, 3.5wt% bisphenol A-type aqueous epoxy resins, 3.0wt% norbide, 4.0wt% boric acid, 4.5wt% boron oxide, 50.0wt% aluminum oxide, 13.0wt% solid content is alumina sol and the 0.1wt%DF568 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
5) anode surface cleans.The anode that assembles is allocated and transported to the paint coating scene, adopted high-pressure air purge anode surface, remove the floating dust of anode spraying face, make the anode surface cleaning.Avoid occurring sticking behind the sprayed coating not firm, delamination occurs.
6) paint coating.Carbon annode after the cleaning is lifted to the casing of spraying equipment, and the coating that adopts box multiple gun fast spraying method that difference is formed is sprayed at anode surface successively, and air pressure is 8-12KPa, each spraying 1 hour at interval.The highest coating of spray coating boron carbide content at first, be coated with the lower coating of norbide content then, be the coating 1 of embodiment 2 preparation), 2), 3), 4) order spray successively, increase along with the number of times of sprayed coating, norbide content in the coating that is sprayed reduces gradually, and norbide content is changed in gradient.Finish the spraying operation of four layers of coating, the coating seasoning.
7) anode that scribbles coating after the drying is used for produce the online alumina base gradient norbide anti-oxidant function coating that forms densification of the heat that utilizes the Aluminium Electrolysis process to produce.According to application result, four-layer structure alumina base gradient norbide oxidation resistant coating realizes saving carbon consumption 15.6kg/t-Al.
Embodiment 3 (five-layer structure)
1) preparation of the first layer coating: with 20.5wt% water, 11.6wt% bisphenol A-type aqueous epoxy resins, 16.0wt% norbide, 4.0wt% boron oxide, 2wt% boric acid, 28.8wt% aluminum oxide, 17.0wt% solid content is alumina sol and the 0.1wt%CLT-371 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
2) preparation of second layer coating: with 20.4wt% water, 11.6wt% bisphenol A-type aqueous epoxy resins, 7.0wt% norbide, 31.0wt% aluminum oxide, 3.4wt% boric acid, 9.5wt% pseudo-boehmite, 17.0wt% solid content is alumina sol and the 0.1wt%CLT-371 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
3) preparation of the 3rd coating: with 20.4wt% water, 9.0wt% bisphenol A-type aqueous epoxy resins, 4.4wt% norbide, 6.5wt% boron oxide, 4.5wt% boric acid, 35.0wt% aluminum oxide, 3.5wt% pseudo-boehmite, 17.0wt% solid content is alumina sol and the 0.1wt% CLT-371 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
4) preparation of the 4th coating: with 23.4wt% water, 8.0wt% bisphenol A-type aqueous epoxy resins, 2.0wt% norbide, 9.5wt% boron oxide, 30.0wt% aluminum oxide, 10.0wt% pseudo-boehmite, 17.0wt% solid content is alumina sol and the 0.1wt% CLT-371 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
5) preparation of layer 5 coating: with 22.8wt% water, 11.6wt% bisphenol A-type aqueous epoxy resins, 1.0wt% norbide, 7.0wt% boron oxide, 3.0wt% boric acid, 37.5wt% aluminum oxide, 17.0wt% solid content is alumina sol and the 0.1wt%CLT-371 defoamer of 5wt%, mixes under the normal temperature and is prepared into coating paste;
6) anode surface cleans.The anode that assembles is allocated and transported to the paint coating scene, adopted high-pressure air purge anode surface, remove the floating dust of anode spraying face, make the anode surface cleaning.Avoid occurring sticking behind the sprayed coating not firm, delamination occurs.
7) paint coating.Carbon annode after the cleaning is filled in the casing of spraying equipment, and the coating that adopts box multiple gun fast spraying method that difference is formed is sprayed at anode surface successively, and air pressure is 8-12KPa, each spraying 1 hour at interval.The highest coating of spray coating boron carbide content at first, be coated with the lower coating of norbide content then, coating 1 by embodiment 3 preparations), order 2), 3), 4), 5) sprays successively, increase along with the number of times of sprayed coating, norbide content in the coating that is sprayed reduces gradually, and norbide content is changed in gradient.Finish the spraying operation of five layers of coating, the coating seasoning.
8) anode that scribbles coating after the drying is used for produce the online alumina base gradient norbide anti-oxidant function coating that forms densification of the heat that utilizes the Aluminium Electrolysis process to produce.According to application result, five-layer structure alumina base gradient norbide oxidation resistant coating realizes saving carbon consumption 18.6kg/t-Al.
Claims (8)
1. aluminum electrolysis carbon anode oxidation coating, it is characterized in that having on electrolysis of aluminum carbon annode surface through weight percent and form the boric acid of the aqueous epoxy resins that comprises 1%-25% bisphenol A-type, 0.1%-16% norbide, 2%-13% and/or boron oxide, 15%-50% aluminum oxide, the pseudo-boehmite of 0%-20%, 10%-30% alumina sol, 0.1%-0.3% defoamer, surplus is that the compo of water is sprayed at electrode surface, the dry oxidation resistant coating that forms.
2. a kind of aluminum electrolysis carbon anode oxidation coating according to claim 1, it is characterized in that described oxidation resistant coating is the oxidation resistant coating that the branch several times are sprayed at electrode surface, drying formation, and be sprayed at electrode surface coating from the inside to the outside, norbide contains successively and successively decreases in its compo composition.
3. a kind of electrolysis of aluminum carbon annode that has oxidation resistant coating according to claim 1, the thickness that it is characterized in that described oxidation resistant coating is 0.1-0.2mm.
4. a kind of electrolysis of aluminum carbon annode that has oxidation resistant coating according to claim 1 is characterized in that described oxidation resistant coating is the oxidation resistant coating that branch is sprayed at electrode surface, drying formation for three times.
5. a kind of electrolysis of aluminum carbon annode that has oxidation resistant coating according to claim 1 is characterized in that described oxidation resistant coating is the oxidation resistant coating that branch is sprayed at electrode surface, drying formation for four times.
6. a kind of electrolysis of aluminum carbon annode that has oxidation resistant coating according to claim 1 is characterized in that described oxidation resistant coating is the oxidation resistant coating that branch is sprayed at electrode surface, drying formation for five times.
7. the coating method of an aluminum electrolysis carbon anode oxidation coating is characterized in that itself and coating procedure thereof comprise:
(1) coating of preparation coating;
(2) cleaning carbon annode surface; With high-pressure air purge carbon annode surface, make the carbon annode surface cleaning dustless;
(3) carbon annode after will cleaning lifts to the casing of spraying equipment, adopts box multiple gun fast spraying method that coating is sprayed at anode surface successively.
8. the coating method of a kind of aluminum electrolysis carbon anode oxidation coating according to claim 7, when it is characterized in that spraying the branch several times and being sprayed at the oxidation resistant coating that electrode surface, drying form, at first the highest coating of spray coating boron carbide content is coated with the lower coating of norbide content then.
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