CN1031572A - Aluminizing method and equipment with the coating of protection slip and Frequency Induction Heating - Google Patents
Aluminizing method and equipment with the coating of protection slip and Frequency Induction Heating Download PDFInfo
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- CN1031572A CN1031572A CN 87101326 CN87101326A CN1031572A CN 1031572 A CN1031572 A CN 1031572A CN 87101326 CN87101326 CN 87101326 CN 87101326 A CN87101326 A CN 87101326A CN 1031572 A CN1031572 A CN 1031572A
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- slip
- frequency induction
- induction heating
- aluminising
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Abstract
Have and protect slip to apply and the aluminizing method of Frequency Induction Heating and non-mechanical approach processing and the process field that equipment belongs to metal; it is a kind of steel aluminising novel method that is widely used in high temperature sulphur, high temperature oxidation, naphthenic acid and corrosive environment of sea water; cost than existing aluminizing technology reduces half; and good, the no fragility skin of quality, labor condition are good; be characterized in being coated with one deck protection slip again, enter the Medium Frequency Induction Heating Furnace heating again in the outside of slurry coating.One 2,500,000 tons/year refinery, only topical application present technique on normal decompression, catalysis, three devices of coking just can obtain 4,630,000 yuan of direct benefits.
Description
The invention belongs to the non-mechanical approach processing and the process field of metal, be a kind ofly be widely used in refining oil, the novel method and the equipment of the steel aluminising of high temperature resistance sulphur, high temperature oxidation, naphthenic acid and sea-water corrosion in the field such as chemical industry.
In the existing technology for to prevent that the aluminizing method of Corrosion Of Steel from having: method etc. is oozed in hot dipping method (liquid method), powder method (solid process), slurry process, vapour deposition process, fused salt electrolysis process and spray, and more employing is hot dipping method and powder method.As described in patent documentation JP57126960, the US4546051.
People are known, and aluminising is that steel and aluminium element are not being had under oxygen (anti-oxidation) and the 900 ℃ of conditions, and aluminium element progressively diffuses into the top layer of steel, become can rot-resistant aluminized coating-ferroaluminium Solid solution process.Aforesaid method all is outer heat, adopt the method that in stove, heats mostly, general slip penetration enhancer promptly begins fusing at about 600 ℃, continue to heat to 900 ℃ again and just can carry out the aluminising diffusion, this external heat source heating, in temperature-rise period, the penetration enhancer temperature is higher than oozes the part surface temperature, ooze the part surface and also have a thermograde to oozing part inside, active element aluminium surpasses it in the velocity of diffusion of oozing part inside oozing the speed that forms on the part surface, so how active element pile up from the teeth outwards, and aluminium and iron at first form compound F 17-hydroxy-corticosterone eAl, deposition from the teeth outwards, rather than the aluminium atom immediately in iron diffusion become the Solid solution of aluminium in iron.The outer field reason of fragility (come off easily and lose preservative property) is always arranged when Here it is with stove heating aluminising.In addition, because it is low to ooze part top layer internal temperature, aluminising speed is slow, and aluminising diffusion processes such as general steel pipe need 8-10 hour.And because aluminium liquid oxidation in the hot dipping process, impregnate layer is blocked up, and starting material and energy wastage are bigger, and cost is also higher; The quality of aluminising is also undesirable, is prone to Lou and oozes, and the depth as shallow of infiltration layer can only reach 0.1-0.15mm, and hot dipping method also exists labor condition bad, and the high-temperature service of interruption is dangerous, is prone to quick-fried spattering and casualty accident.
The slurry process aluminising has similar place with the powder method technological process.It is to be coated with slip with special formulation as penetration enhancer on workpiece surface, and the composition of penetration enhancer slip has aluminium source, promoting agent, filler, binding agent and thinner.The aluminium source is a material of supplying with aluminium element, is generally aluminium powder or ferroaluminium powder.Promoting agent is an energizer, and its effect is to impel the generation active aluminum, quickens the aluminising process, generally with ammonium chloride etc.Filler is generally used aluminum oxide (Al
2O
3), the thinner alcohols.Vanning is put into and adds thermodiffusion in the stove then.
The prescription of penetration enhancer slip and brushing method are very big to the influence of aluminized coating quality, and the consumption of various compositions and ratio have influence on alloying layer thickness, surface quality and ooze the preceding difficulty or ease of brushing and oozing the back shelling in the penetration enhancer slip.The penetration enhancer slip that tradition is used often causes to be difficult for brushing because various one-tenth component selections are improper and consumption is improper, and layer surface is coarse, and dirt settling is many, is difficult for shelling or shortcoming such as dross existence is arranged.
The powder method aluminising is that workpiece is placed in the chest that aluminium powder and auxiliary agent are housed, and charges into rare gas element, and also there is the cost height in heat aluminising then, labour intensity is big, the production cycle is long, the outer field shortcoming of fragility is arranged.Other as vapour deposition process, fused salt electrolysis process and spray ooze method etc. also all exist cost height, efficient low, to shortcoming big, that long workpiece can't be handled.Electrical heating method is directly energising heating fast, though temperature rise is very fast, needs sizable power, is unsuitable for industrial production.
In order to overcome aforesaid these shortcomings, first purpose of the present invention is to solve the aluminising quality, eliminate the microfracture problem that fragility is outer and cause, second purpose is to reduce the aluminising cost, and the 3rd purpose is to process the workpiece and the tubing of random length, the 4th purpose is to improve working conditions, aforesaid accident does not take place in safety, and the 5th purpose is cancellation nitrogen consumption and corresponding air separation plant, the 6th purpose is can operate continuously, replaces existing intermittent operation.
General introduction of the present invention: (referring to accompanying drawing)
We think that solving the outer field key of fragility is to cause the temperature transmission different with conventional aluminising mode, just make the temperature of workpiece be higher than slurry temperature, or reach the aluminising temperature simultaneously with slip, so just can ooze soon, ooze evenly, quality is good, no fragility skin, and ooze deeply, can reach the ferro-aluminium layer of 0.2 mm thick.Therefore the present invention adopts the intermediate frequency electric induction heating process; with an induction furnace (1) control current frequency at 500～8000 He Zhi; for ease of processing farm labourer part; with rotary conveyor (5) workpiece is at the uniform velocity moved forward; heat aluminising piecemeal; can make the workpiece of having brushed slip and protection slip reach 900～1300 ℃ of desired temperature very soon like this, enter constant temperature oven (2) then immediately and carry out Diffusional aluminizing.Constant temperature oven can be outer heat, also can be internally heated, preferably also uses electrical induction heating, and temperature is at 900～1100 ℃, and workpiece is very short in the total residence time of Medium Frequency Induction Heating Furnace and constant temperature oven, only needs just can meet the demands in 4～8 minutes.
For avoiding aluminium source in the penetration enhancer slip (aluminium powder or ferroaluminium powder) high temperature oxidation, guaranteeing has enough aluminium sources in the penetration enhancer, should be in penetration enhancer slip outside slushing's slip again.
For overcoming prescription and the improper problem of bringing of brushing method because of penetration enhancer slip and protective layer slip; the present invention uses protective layer slip and unique brushing method on traditional slurry process basis; when with intermediate frequency electrical induction heating (Diffusional aluminizing process) method in conjunction with the time, can produce the second best in quality aluminized coating.
Prove that through our practical application if the unprotect feed pulp layer, then the effect of aluminising is bad.The prescription of this protection slip is: filler-and can be with (40%～70%) such as various mineral rock dust, glass powder, aluminum oxide and clays; Binding agent-can be with tolerating the pyritous material, for example (10%～30%) such as hydrolyzing ethyl silicate, polymer-type binding agent, spent pulping liquors; Thinner-can water and alcohols (20%～40%).After the brushing of protection slip, want dry earlier, preferably be heated to 40～100 ℃, the effect of such temperature drying is best, and the mode of heating can adopt the steam indirect heating, also can use warm air, also can heat with infrared rays or alternate manner.Naturally cooling again when temperature is reduced to below 60 ℃, and then brush one time, preferably can brush 2～3 times by this way.Send into next step operation then: Medium Frequency Induction Heating Furnace (1) heats the aluminising process; Deliver to constant temperature oven (2) again, carry out the abundant diffusion of aluminising, and then deliver to stay-warm case (3), workpiece is slowly lowered the temperature, use roll-type transfer roller (4) that the part that oozes of pipe part is transported at last, be placed on naturally cooling in the air.In process of cooling, the molten slag on surface can shell automatically, generally can surface cleaning is clean with high pressure water.
It is gratifying using the quality of aluminizing method of the present invention: the high temperature oxidation resistance of calorized steel is fabulous, and under 800 ℃, through 200 hours, it was atomic to increase weight.And carbon steel and stainless steel (18-8) weightening finish is respectively 250 times and 3 times of calorized steel.
In high temperature resistance sulfur corrosion test, under 800 ℃, the 100 hours situations, the weightening finish of carbon steel and steel alloy (18-8) is respectively 40 times and 8 times of calorized steel.
Aspect anti-naphthenic acid corrosion, when naphthenic acid content is that resistance to corrosion improves 40 times than carbon steel when annotating alkali dosis neutralisata 37%.
The anti-stress corrosion performance of aluminising 20# steel does not reduce than the 20# steel of not aluminising.
Steel after the aluminising or steel part can carry out welding processing, enlarging and bending.
Because use Frequency Induction Heating, rate of heating is fast, superheating temperature △ T is big, and austenite crystal is little, and the velocity of diffusion of aluminium in austenite is big, has eliminated aluminium and has formed ferro-aluminum compound F 17-hydroxy-corticosterone eAl and sedimentary phenomenon oozing the part surface.So the aluminized coating among the present invention does not have the brittle zone, and in existing other alumetizing process, the different fragility skin of degree is arranged all.
Combine with frequency induction heating and slurry process, the aluminized coating thickness that obtains is the 0.15-0.20 millimeter, and has only the 0.10-0.15 millimeter with what the indirect heating method obtained.To the X-ray diffraction analysis result that soft steel aluminising part carries out, the metallographic structure of aluminized coating, (0 millimeter of the degree of depth) phase composite is the Solid solution of α-Fe(Al) from the teeth outwards, minute quantity Al
2O
3Be the Solid solution of α-Fe(Al) at 0.02 millimeter of the degree of depth and 0.10 millimeter place.
Economical effectiveness of the present invention is significant, and the cost of aluminising can be reduced to half that use ordinary method.In the refinery of 2,500,000 tons of annual outputs, only calorized steel is used in part in its normal decompression, catalysis and three devices of coking and replace common iron, calculate by its life-span (bringing up to 15 years) from 2 years, direct benefit can reach 4,630,000 yuan.
From technology of the present invention, our other purpose also reaches: labor condition is good, safety, aluminizing furnace can intermittent operation also can operate continuously, do not need to consume nitrogen in the process, can process the workpiece of random length.
Embodiment 1:
Aluminium impregnation of steel tube preservative slurry formula:
Glass powder 20% enamel powder 20% mineral substance powder 10%
Alundum 7% spent pulping liquor 17% water 26%
The intermediate frequency condition of divergence is:
2200 hertz of 900 ℃ of 10 minutes times of heating of frequency
Embodiment 2:
Aluminium impregnation of steel tube preservative slurry formula:
Glass powder 20% enamel powder 20% mineral substance powder 18%
Spent pulping liquor 17% ethanol 26%
The intermediate frequency condition of divergence is:
1400 hertz of 950 ℃ of 10 minutes times of heating of frequency
Claims (13)
1, the invention belongs to the on-mechanical method processing and the process field of metal, be used for replacing the external-heat aluminizing method of existing various anticorrosion usefulness, be a kind of on the slurry process basis improved method (synthesis by internal resistance electric melting) with the coating of protection slip and Frequency Induction Heating.It is characterized in that being coated with protection slip again, enter the method that Medium Frequency Induction Heating Furnace (1) is carried out aluminising then with uniqueness in the outside of common penetration enhancer slurry coating.
2, by claim 1 described method, it is characterized in that protecting slip to form by binding agent, filler and reduction paste.
3, by claim 1 and 2 described methods, it is characterized in that protecting the formula rate of slip to be: binding agent 10～30%, filler 40～70%, thinner 20～40%.
4, by claim 3 described protection slips; the composition that it is characterized in that slip comprises: binding agent-and can be hydrolyzing ethyl silicate; also can be polymer-type binding agent, paper waste liquid etc.; thinner-can water or alcohols, filler-can be various mineral rock dust, glass powder, enamel powder, aluminum oxide or clay.
5,, it is characterized in that protecting best 2～3 times of the brushing of slip by claim 1 described method.
6, by claim 4 or 5 described protection slips, it is characterized in that whenever all over after the brushing, preferably be heated to 40～100 ℃ and carry out heat preservation and dryness.
7, by claim 5 and 6 described methods, it is characterized in that heating and the mode that is incubated can be a steam, also can be that warm air or infrared rays are made thermal source.
8, by claim 6 described methods, it is characterized in that protecting the slip drying after, when preferably reducing the temperature to below 60 ℃, naturally cooling again.
9, by claim 1 described method, the power frequency that it is characterized in that Medium Frequency Induction Heating Furnace is 500～8000 He Zhi.
10,, it is characterized in that to pass through rotary conveyor (5) feeding piecemeal evenly when running into long workpiece aluminising by claim 1 described method.
11, by claim 1 described method, it is characterized in that the workpiece of medium-frequency induction furnace (1), should send into constant temperature oven (2) immediately.
12, by claim 1 and 11 described methods, it is characterized in that the workpiece of constant temperature oven (2), should enter stay-warm case (3) immediately.
13, the aluminising equipment that has protection slip coating and Frequency Induction Heating is characterized by and comprises that heating has applied the device of protection slip workpiece, medium-frequency induction furnace (1), constant temperature oven (2), stay-warm case (3), movement mechanisms (4) and (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101326 CN1007735B (en) | 1987-04-14 | 1987-04-14 | Alumetizing method and equipment with protective pulp coating and intermediate frequency induction heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101326 CN1007735B (en) | 1987-04-14 | 1987-04-14 | Alumetizing method and equipment with protective pulp coating and intermediate frequency induction heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1031572A true CN1031572A (en) | 1989-03-08 |
| CN1007735B CN1007735B (en) | 1990-04-25 |
Family
ID=4813320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87101326 Expired CN1007735B (en) | 1987-04-14 | 1987-04-14 | Alumetizing method and equipment with protective pulp coating and intermediate frequency induction heating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007735B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014612A (en) * | 2012-11-21 | 2013-04-03 | 中国科学院金属研究所 | Method for performing high-speed aluminizing on slurry without protective atmosphere or protective layer under atmospheric conditions |
| CN103088194A (en) * | 2011-08-12 | 2013-05-08 | 通用汽车环球科技运作有限责任公司 | Pre-diffused Al-Si Coatings For Use In Rapid Induction Heating Of Press-hardened Steel |
| CN103992121A (en) * | 2014-04-24 | 2014-08-20 | 王会智 | Furnace cleanser for aluminum |
| CN103992122A (en) * | 2014-04-24 | 2014-08-20 | 王会智 | Furnace cleaning and protecting material for aluminum |
| CN106893972A (en) * | 2017-03-15 | 2017-06-27 | 常熟理工学院 | A kind of method of sensing heating neutral salt bath in surface of low-carbon steel aluminising |
| CN111926284A (en) * | 2020-07-30 | 2020-11-13 | 西安热工研究院有限公司 | Steam turbine high-medium pressure inner cylinder steam oxidation resistant coating and preparation method thereof |
| CN114351082A (en) * | 2022-01-12 | 2022-04-15 | 彭州航大新材料有限公司 | Local slurry aluminizing process for nickel-based superalloy and slurry permeating agent |
| CN114657544A (en) * | 2022-03-24 | 2022-06-24 | 彭州航大新材料有限公司 | Aluminizing cobalt process for inner cavity surface of nickel-based superalloy and cobalt-aluminum infiltration layer |
-
1987
- 1987-04-14 CN CN 87101326 patent/CN1007735B/en not_active Expired
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103088194A (en) * | 2011-08-12 | 2013-05-08 | 通用汽车环球科技运作有限责任公司 | Pre-diffused Al-Si Coatings For Use In Rapid Induction Heating Of Press-hardened Steel |
| CN103014612A (en) * | 2012-11-21 | 2013-04-03 | 中国科学院金属研究所 | Method for performing high-speed aluminizing on slurry without protective atmosphere or protective layer under atmospheric conditions |
| CN103014612B (en) * | 2012-11-21 | 2015-07-15 | 中国科学院金属研究所 | Method for performing high-speed aluminizing on slurry without protective atmosphere or protective layer under atmospheric conditions |
| CN103992121A (en) * | 2014-04-24 | 2014-08-20 | 王会智 | Furnace cleanser for aluminum |
| CN103992122A (en) * | 2014-04-24 | 2014-08-20 | 王会智 | Furnace cleaning and protecting material for aluminum |
| CN103992121B (en) * | 2014-04-24 | 2016-01-06 | 王会智 | A kind of aluminium clean material of stove |
| CN106893972A (en) * | 2017-03-15 | 2017-06-27 | 常熟理工学院 | A kind of method of sensing heating neutral salt bath in surface of low-carbon steel aluminising |
| CN106893972B (en) * | 2017-03-15 | 2019-01-04 | 常熟理工学院 | A kind of method of induction heating neutral salt bath in surface of low-carbon steel aluminising |
| CN111926284A (en) * | 2020-07-30 | 2020-11-13 | 西安热工研究院有限公司 | Steam turbine high-medium pressure inner cylinder steam oxidation resistant coating and preparation method thereof |
| CN111926284B (en) * | 2020-07-30 | 2022-09-09 | 西安热工研究院有限公司 | Steam turbine high-medium pressure inner cylinder steam oxidation resistant coating and preparation method thereof |
| CN114351082A (en) * | 2022-01-12 | 2022-04-15 | 彭州航大新材料有限公司 | Local slurry aluminizing process for nickel-based superalloy and slurry permeating agent |
| CN114351082B (en) * | 2022-01-12 | 2024-01-30 | 彭州航大新材料有限公司 | Nickel-based superalloy local slurry aluminizing process and slurry penetrant |
| CN114657544A (en) * | 2022-03-24 | 2022-06-24 | 彭州航大新材料有限公司 | Aluminizing cobalt process for inner cavity surface of nickel-based superalloy and cobalt-aluminum infiltration layer |
| CN114657544B (en) * | 2022-03-24 | 2023-10-27 | 彭州航大新材料有限公司 | Cobalt aluminizing process and cobalt aluminizing layer for inner cavity surface of nickel-based superalloy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1007735B (en) | 1990-04-25 |
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