CN108950472A - A kind of low temperature aluminizing method - Google Patents
A kind of low temperature aluminizing method Download PDFInfo
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- CN108950472A CN108950472A CN201810910577.4A CN201810910577A CN108950472A CN 108950472 A CN108950472 A CN 108950472A CN 201810910577 A CN201810910577 A CN 201810910577A CN 108950472 A CN108950472 A CN 108950472A
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- aluminium powder
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/36—Embedding in a powder mixture, i.e. pack cementation only one element being diffused
- C23C10/48—Aluminising
- C23C10/50—Aluminising of ferrous surfaces
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a kind of low temperature aluminizing methods.Temperature needed for sufficiently reducing alumetizing process using specific aluminizing medium ingredient and ratio, boiler superheater is protected with the two-part alumetizing process slowly to heat up using being rapidly heated, it is successfully prepared dense structure, the uniform coat of aluminide of structure, the corrosion rate of boiler superheater can be reduced by 6 times or more, the decline for avoiding the variation for causing the stainless steel microstructure of matrix and then leading to basis material mechanical performance, it realizes the extension of corrosion of superheater service life 5 years or more, the economic benefit of biomass power plant is greatly improved.
Description
Technical field
The present invention relates to a kind of boiler superheater corrosion-inhibiting coating low temperature aluminizing methods, belong to the technology of high-temperature anticorrosion coating
Field.
Background technique
For the High Temperature Corrosion of generating power with biomass combustion, using the strategy for applying corrosion protective coating, to boiler mistake
Hot device is protected.Solid powder investment aluminising is a kind of technology of comparative maturity, has been successfully applied to many anti-high rotten
The workpiece of erosion.Metal works are placed in the aluminizing medium containing aluminium element, certain temperature is heated to, after keeping appropriate time, are seeped
The active atomic that aluminium agent thermally decomposes generated aluminium element is just adsorbed to workpiece surface, and diffuses into workpiece surface, thus
Change chemical component, tissue and the performance of workpiece surface.Pack aluminizing is surrounded due to seeping part by powder, and leakage is seeped seldom, behaviour
Make simple process, deep layer depth is easy to control, and equipment investment is small, but the temperature of current pack cementation aluminizing is higher, to the comprehensive of alloy
It is harmful to close performance, is not able to satisfy the needs of particular component corrosion-inhibiting coating.Traditional coat of aluminide preparation temperature is generally at 900 DEG C
More than, prepare at such a temperature coat of aluminide will matrix stainless steel material to boiler superheater generate performance and destroy.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of low temperature aluminizing methods.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of low temperature aluminizing method, characterized in that in proportion (can use aluminium powder, iron aluminium powder, ammonium chloride in stannic chloride or sulfonation ammonium
A kind of replacement) yttrium oxide be sufficiently mixed uniformly after with need the superheater for carrying out aluminising processing to be co-located in the infiltrating irrigation of sealing,
7-10h is kept the temperature under conditions of 500-520 DEG C using gas sealed powder investment and carries out aluminising processing, gas used is
Inert gas.3-5h is kept the temperature under conditions of 530-535 DEG C again and carries out aluminising processing, it is then cooling, cooling time 12-24h.
In percentage by weight, the aluminizing medium is following component: aluminium powder 40-60%；Iron aluminium powder 20-30%；Ammonium chloride, stannic chloride
Or one of sulfonation ammonium 1-10%；Yttrium oxide 5-9%；Aluminium oxide or schmigel surplus.
Preferably in percentage by weight, the aluminizing medium is following component:
Aluminium powder 53%；
Iron aluminium powder 26%；
One of ammonium chloride, stannic chloride or sulfonation ammonium 8.5%；
Yttrium oxide 7.5%；
Aluminium oxide or schmigel surplus.
Preferred heating rate is respectively 50 DEG C/min and 2-5 DEG C/min.
Gas used is the nitrogen containing argon gas.
10h is preferably kept the temperature under conditions of 500 DEG C using gas sealed powder investment and carries out aluminising processing, heating
Rate is 50 DEG C/min, and gas used is the nitrogen containing argon gas.5h is kept the temperature under conditions of 530 DEG C again to carry out at aluminising
Reason, heating rate are that 5 DEG C/min is then cooled down, and cooling time is for 24 hours.
Advantageous effects of the invention:
Temperature needed for sufficiently reducing alumetizing process using specific aluminizing medium ingredient and ratio, using being rapidly heated and slowly rise
The two-part alumetizing process of temperature protects boiler superheater, is successfully prepared dense structure, and the uniform aluminide of structure applies
The corrosion rate of boiler superheater can be reduced by 6 times or more by layer, avoid causing the variation of the stainless steel microstructure of matrix in turn
Lead to the decline of basis material mechanical performance, realizes the extension of corrosion of superheater service life 5 years or more, biomass power plant is greatly improved
Economic benefit.
Specific embodiment
The invention will be further described combined with specific embodiments below.Following embodiment is only used for clearly illustrating
Technical solution of the present invention, and not intended to limit the protection scope of the present invention.
Embodiment 1
In percentage by weight: by aluminium powder 53%, iron aluminium powder 26%, ammonium chloride 8.5%, yttrium oxide 7.5%；, aluminium oxide 5% it is abundant
It is co-located in the infiltrating irrigation of sealing with the superheater for carrying out aluminising processing is needed, is embedded using gas sealed powder after mixing
Method keeps the temperature 10h under conditions of 500 DEG C and carries out aluminising processing, and heating rate is 50 DEG C/min, and gas used is to contain argon gas
Nitrogen.5h is kept the temperature under conditions of 530 DEG C again and carries out aluminising processing, heating rate is that 5 DEG C/min is then cooled down, cooling time
For for 24 hours.Dense structure, the uniform coat of aluminide of structure are obtained, coating layer thickness is about 100 μm, is heated under 1200 DEG C of high temperature
5min recycles 100 secondary coatings into the water and does not fall off, do not occur corrosion phenomenon.
Embodiment 2
In percentage by weight: by aluminium powder 40%, iron aluminium powder 30%, stannic chloride 10%, yttrium oxide 5%；, aluminium oxide 15% it is sufficiently mixed
After closing uniformly and the superheater for carrying out aluminising processing is needed to be co-located in the infiltrating irrigation of sealing, using gas sealed powder investment
10h is kept the temperature under conditions of 520 DEG C and carries out aluminising processing, and heating rate is 50 DEG C/min, and gas used is to contain argon gas
Nitrogen.5h is kept the temperature under conditions of 535 DEG C again and carries out aluminising processing, heating rate is that 2 DEG C/min is then cooled down, and cooling time is
12h.Dense structure, the uniform coat of aluminide of structure are obtained, coating layer thickness is about 80 μm, is heated under 1200 DEG C of high temperature
5min recycles 80 secondary coatings into the water and does not fall off, do not occur corrosion phenomenon.
Embodiment 3
By aluminium powder 60%, iron aluminium powder 20%, sulfonation ammonium 5%, yttrium oxide 5%；, corundum 10% be sufficiently mixed uniformly after with seeped
The superheater of aluminium processing is co-located in the infiltrating irrigation of sealing, is kept the temperature under conditions of 520 DEG C using gas sealed powder investment
10h carries out aluminising processing, and heating rate is 50 DEG C/min, and gas used is the nitrogen containing argon gas.Again in 535 DEG C of condition
Lower heat preservation 5h carries out aluminising processing, and heating rate is that 4 DEG C/min is then cooled down, cooling time 18h.Dense structure is obtained, is tied
The uniform coat of aluminide of structure, coating layer thickness are about 90 μm, and 5min is heated under 1200 DEG C of high temperature, recycle 85 paintings into the water
Layer is not fallen off, and does not occur corrosion phenomenon.
The above is only a preferred embodiment of the present invention, it is noted that those skilled in the art are come
It says, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of low temperature aluminizing method, characterized in that in proportion will
Aluminium powder
Iron aluminium powder
One of ammonium chloride, stannic chloride or sulfonation ammonium
After yttrium oxide is sufficiently mixed uniformly and the superheater for carrying out aluminising processing is needed to be co-located in the infiltrating irrigation of sealing, using gas
Closed powder investment keeps the temperature 7-10h under conditions of 500-520 DEG C and carries out aluminising processing, and gas used is indifferent gas
Body, then keep the temperature 3-5h under conditions of 530-535 DEG C and carry out aluminising processing, it is then cooling, cooling time 12-24h.
2. a kind of method according to claim 1, characterized in that in percentage by weight, the aluminizing medium is such as
Lower component: aluminium powder 40-60%；Iron aluminium powder 20-30%；One of ammonium chloride, stannic chloride or sulfonation ammonium 1-10%；Yttrium oxide 5-9%；
Aluminium oxide or schmigel surplus.
3. a kind of method according to claim 1, characterized in that in percentage by weight, the aluminizing medium is such as
Lower component:
Aluminium powder 53%；
Iron aluminium powder 26%；
One of ammonium chloride, stannic chloride or sulfonation ammonium 8.5%；
Yttrium oxide 7.5%；
Aluminium oxide or schmigel surplus.
4. a kind of method according to claim 3, heating rate is respectively 50 DEG C/min and 2-5 DEG C/min.
5. a kind of method according to claim 4, characterized in that gas used is the nitrogen containing argon gas.
6. a kind of method according to claim 5, it is characterized in that the item using gas sealed powder investment at 500 DEG C
10h is kept the temperature under part and carries out aluminising processing, and heating rate is 50 DEG C/min, and gas used is the nitrogen containing argon gas, then 530
5h is kept the temperature under conditions of DEG C and carries out aluminising processing, and heating rate is that 5 DEG C/min is then cooled down, and cooling time is for 24 hours.
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| CN201810910577.4A CN108950472A (en) | 2018-08-11 | 2018-08-11 | A kind of low temperature aluminizing method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227274A (en) * | 1999-01-12 | 1999-09-01 | 中国人民解放军第5719工厂 | Low temperature aluminizing technology for steel blade of aircraft engine |
| CN1232886A (en) * | 1999-01-12 | 1999-10-27 | 中国人民解放军第5719工厂 | Multiple low-temperature aluminizing technology for steel blade of aircraft engine |
| CN101988204A (en) * | 2009-08-05 | 2011-03-23 | 中国科学院金属研究所 | CeO2-diffused superfine crystalline delta-Ni2Al3 coating, and preparation method and application thereof |
| CN102615914A (en) * | 2012-03-23 | 2012-08-01 | 上海大学 | Thermal barrier coating with modified Pt and method for preparing thermal barrier coating |
| CN104911536A (en) * | 2015-06-25 | 2015-09-16 | 山东农业大学 | Surface-nanocrystallization low-temperature aluminizing treatment method for steel products |
| CN105671482A (en) * | 2016-03-17 | 2016-06-15 | 南通航运职业技术学院 | Powder-embedded aluminizing medium and aluminizing method for nickel-based high-temperature alloy surface |
| CN108677139A (en) * | 2018-06-25 | 2018-10-19 | 李海霞 | A kind of pack aluminizing agent and nickel base superalloy alitizing method |
-
2018
- 2018-08-11 CN CN201810910577.4A patent/CN108950472A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227274A (en) * | 1999-01-12 | 1999-09-01 | 中国人民解放军第5719工厂 | Low temperature aluminizing technology for steel blade of aircraft engine |
| CN1232886A (en) * | 1999-01-12 | 1999-10-27 | 中国人民解放军第5719工厂 | Multiple low-temperature aluminizing technology for steel blade of aircraft engine |
| CN101988204A (en) * | 2009-08-05 | 2011-03-23 | 中国科学院金属研究所 | CeO2-diffused superfine crystalline delta-Ni2Al3 coating, and preparation method and application thereof |
| CN102615914A (en) * | 2012-03-23 | 2012-08-01 | 上海大学 | Thermal barrier coating with modified Pt and method for preparing thermal barrier coating |
| CN104911536A (en) * | 2015-06-25 | 2015-09-16 | 山东农业大学 | Surface-nanocrystallization low-temperature aluminizing treatment method for steel products |
| CN105671482A (en) * | 2016-03-17 | 2016-06-15 | 南通航运职业技术学院 | Powder-embedded aluminizing medium and aluminizing method for nickel-based high-temperature alloy surface |
| CN108677139A (en) * | 2018-06-25 | 2018-10-19 | 李海霞 | A kind of pack aluminizing agent and nickel base superalloy alitizing method |
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