CN103014614A - Permeation tank layered buried type diffusion aluminizing method for prevention of corrosion of inner and outer walls of heat exchange pipe - Google Patents
Permeation tank layered buried type diffusion aluminizing method for prevention of corrosion of inner and outer walls of heat exchange pipe Download PDFInfo
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- CN103014614A CN103014614A CN2012105558439A CN201210555843A CN103014614A CN 103014614 A CN103014614 A CN 103014614A CN 2012105558439 A CN2012105558439 A CN 2012105558439A CN 201210555843 A CN201210555843 A CN 201210555843A CN 103014614 A CN103014614 A CN 103014614A
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- case
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- aluminizing
- ooze
- heat exchange
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Abstract
The invention relates to a permeation tank layered buried type diffusion aluminizing method for prevention of corrosion of the inner and outer walls of a heat exchange pipe, which is suitable for corrosion prevention of the inner and outer walls of a heat exchange pipe for a heat exchange device in the non HCL environment. The overall mechanical properties of the heat exchange pipe aluminized through the method basically remain unchanged, and the surface aluminized coating has excellent high temperature oxidation resistance and corrosion resistance, and also has good carburization resistance and hydrogen permeation resistance; the aluminized coating has excellent corrosion resistance to S, H2S, S02, S03 and RCOOH (naphthenic acid) at the high temperature of 240-500 DEG C, has excellent corrosion resistance to H2S, CO, CO2, NH3, HCN, HNO3, seawater and other media in the wet environment at the low temperature of 120 DEG C below, particularly to H2S, and also has a significant advantage on the performance price ratio of stainless steel; through the adoption of the structural form of the permeation tank and the blending ratio of the permeating agents, the process method is simple to operate, labor-saving and time-saving and little in environmental pollution; therefore, the method is widely used in various industries such as petroleum, chemicals, metallurgy and electric power.
Description
Technical field
The invention belongs to the material antiseptic field, relate to the anticorrosion of chemical petroleum heat-exchange equipment carbon steel heat transfer tube, ooze the buried Diffusional aluminizing method of case layer in particular for heat transfer tube inside and outside wall rot-resistant.
Background technology
Along with the continuous increase of China's processing import high-sulfur, crude oil with high acid value, the equipment corrosion problem more and more constitutes a threat to the device long-term operation.And common coating antiseptic exists non-refractory, non-resistance to erosion, the easy defective such as aging, drop into and rely on the upgrading material rate will greatly increase to build, and the anti-H of stainless material
2S corrodibility is not high.The solid-state diffusion aluminizing technology can solve facility investment and the direct contradiction of material erosion resistance well, and good society and economic benefit are arranged.
By retrieval, do not find the technical literature identical with present patent application.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide a kind of and ooze the buried Diffusional aluminizing method of case layer for heat transfer tube inside and outside wall rot-resistant, to the high-sulpur crude anticorrosion ability, reduce equipment cost with the Effective Raise carbon steel equipment.
The present invention realizes that the technical scheme of purpose is as follows:
Described other materials comprises sodium hydroxide, Sunmorl N 60S, glass powder, NaF, NH
4Cl, refractory mortar, its part by weight is: sodium hydroxide: Sunmorl N 60S: glass powder: NaF:NH
4Cl: refractory mortar=1:0.3:4:1:0.8:15.
Advantage of the present invention and positively effect are:
1, the heat transfer tube after the present invention processes, its overall mechanical properties remains unchanged substantially, and the alitizing layer has excellent high temperature oxidation resistance and corrosion resistance nature, and also has good anti-carburizing and impervious hydrogen, and aluminized coating has excellent high temperature resistance S, H in 240 ℃ ~ 500 ℃ scopes
2S, S0
2, S0
3And RCOOH (ring a heatable brick bed acid〉corrosive power, good anti-H is arranged in Low Temperature Wet environment below 120 ℃
2S, CO, CO
2, NH
3, HCN, HNO
3With the corrosive power of the media such as seawater, especially anti-H
2S corrosion has an obvious superiority of effectiveness to stainless.
2, the structural shape that oozes case of the present invention and penetration enhancer proportioning, processing method are simple to operate, save time, laborsaving, environmental pollution is little, have a wide range of applications in industries such as oil, chemical industry, metallurgy, electric power, the heat transfer tube inside and outside wall that is applicable to non-HCl environment high-sulpur crude heat-exchange equipment is anticorrosion.
Embodiment
The invention will be further described below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
For ease of narrating whole technical process, at first narrate the structure of oozing case:
1, oozing case is cuboid, also can be circular (being applicable to pit furnace), comprises casing, case lid and thermopair, and material therefor is δ 20 steel plates (Q235 and more than), and gusset adopts δ 14 steel plates, and casing connects ring flat-plate and adopts δ 26 steel plates; Casing weld degree is no more than (1/10 wall thickness+2) mm, and linearity is no more than 1% total length;
2, all casing weld seams are sequential welding, and casing (containing top cover) body attachment weld carries out 100%UT and detects, and JB4730-2005 standard I level is qualified, do not mark leg and are thinner thickness, and gusset adopts the staggered intermittent welding of 50*50mm.
3, every 3000mm arranges a thermopair, and thermopair is arranged on 1/2 box height, and the position is placed in the middle, and lead-in wire is passed by breather hole.
4, ooze the outer semicanal of case top cover and fill complete rear welding at workpiece and penetration enhancer, guarantee after the welding without leaking.
A kind ofly ooze the buried Diffusional aluminizing method of case layer for heat transfer tube inside and outside wall rot-resistant, step is:
⑴ (the aluminium powder material accounts for 80-85% by a certain percentage with various metals and non-metallic material, the Graphite Powder 99 material accounts for 10%, and other materials accounts for 6-10%) prepare, at the airtight solid alloy of smelting into below 400 ℃, then this alloy is worn into 200 ~ 300 purpose powder, this powdered alloy is called aluminizing medium;
⑵ aluminizing medium main component is: sodium hydroxide, Sunmorl N 60S, aluminium sesquioxide, aluminium powder, Graphite Powder 99, glass powder, refractory mortar, NaF, NH4Cl etc.; Wherein, sodium hydroxide, Sunmorl N 60S, glass powder, NaF, NH
4The part by weight of Cl, refractory mortar is: sodium hydroxide: Sunmorl N 60S: glass powder: NaF:NH
4Cl: refractory mortar=1:0.3:4:1:0.8:15.
⑶ will be oozed workpiece and pack into by horizontal stratification and ooze in the case, then to oozing the deployed aluminizing medium of packing in the case, case is oozed in limit dress aluminizing medium limit vibration, make that aluminizing medium tightly is full of in the case between workpiece and workpiece, the institute between workpiece and casing has living space, minimum spacing is 10mm between the workpiece, places 1-2 according to the workpiece size at interlayer and props up thermopair, and thermopair need add metal covering, lead-in wire passes from breather hole, casing is sealed on request after filling it up with aluminizing medium.
Be convenient to cleaning for rot-resistant aluminizing medium in the heat transfer tube, needing increases certain ratio molding sand (ratio 1%), to guarantee collapsibility;
⑷ will ooze case and put in the process furnace, and by the process curve intensification of setting, constant temperature, cooling, when blowing out is cooled to certain temperature, namely temperature rise speed is less than 300 ℃/h, and thermostat temperature is 700-900 ℃, oozes case under the constant temperature time 4-6h condition and comes out of the stove.Ooze the case surface when dropping to below 40 ℃, open ooze the case workpiece with aluminizing medium outlet, workpiece separate with the aluminizing medium agent, workpiece cleaning, the warehouse-in of inspecting for acceptance, penetration enhancer recycling.
The working mechanism that oozes the buried Diffusional aluminizing of case layer involved in the present invention:
Oozing the buried Diffusional aluminizing method of case layer is that quilt is oozed workpiece and pack aluminizing agent, it is airtight in the special casing to pack into by certain requirement, put in the process furnace, by certain requirement heating, constant temperature, thereby a series of chemical reaction occurs in the aluminizing medium in heat-processed, the aluminium atom activation in the penetration enhancer is arrived aluminium atom infiltration (diffusion) in the matrix of steel top layer, form the process of one deck ferro-aluminium in the matrix of steel top layer.
The relation of the tissue of infiltration layer and hardness and aluminium content.
According to the ferro-aluminium state graph, along with the increase of aluminium content in the infiltration layer, Solid solution, the Fe of aluminium in α iron in infiltration layer, occur successively
3A1, FeAl, FeAl
2With a small amount of Fe
2Al
5And FeAl
3Deng, diffusion layer organization, hardness and aluminium content have following corresponding relation:
A layer surface major ingredient is FeAl
2With a small amount of Fe
2A1
5And FeA1
3This layer is the hardest at HV
0.05500 ~ HV
0.05About 650, the aluminium content of this layer is about 45% (wt);
B second layer major ingredient is A1
4C
3Phase, grey is bar-shaped;
The 3rd layer of major ingredient of c is FeAl, hardness value HV
0.05300 ~ HV
0.05About 500, about this layer aluminium content 32% (wt);
The 4th layer of major ingredient of d is Fe
3A1, hardness is at HV
0.05Below 400, this layer aluminium content is below 14%;
The Solid solution of e layer 5 Al in α iron, hardness is at HV
0.05Below 300, aluminium content is below 10% (wt).
The f layer 6 is poor carbon district.
The g layer 7 is carbon-rich zone.
Aluminized coating is divided into above seven layers and only is theoretic statement, and some layer may not exist actually, even some exists interlayer also not have obvious boundary.
3, pressed powder penetration enhancer effect
Various metals and non-metallic material are prepared by a certain percentage, smelt into alloy under specific environment, then this alloy is worn into 200 ~ 300 purpose powder, this powdered alloy is called aluminizing medium.Its effect has following four:
The one, as thermal barrier, make by the workpiece thermally equivalent of its embedding;
The 2nd, as packing material, tightly be full of workpiece and workpiece, workpiece and the institute of oozing between case have living space, and workpiece can't be out of shape;
The 3rd, this penetration enhancer has the floating rust function of the workpiece surface of removing, and some composition when being heated to certain temperature in the penetration enhancer and the ferric oxide generation chemical reaction on the workpiece are removed the rust on the workpiece; In heat-processed, react with mixing wherein aluminium powder, energizer etc. because being penetration enhancer, make the aluminium atom activate the condition that enters the steel surface matrix that reaches.
1. penetration enhancer, heat transfer tube layering are seated in and ooze in the case, change length according to heat exchange, ooze case and can be divided into vertical, horizontal;
2. in the case thermopair is set, is convenient to carry out temperature control;
3. adopt the pressed powder covering to bury, contact is abundant, diffusion is even, and workpiece does not need acid pickling and rust removing.In process of production no acidic pollutant emission;
But 4. be the penetration enhancer life-time service, effectively reduced production cost.
Claims (4)
1. one kind is used for heat transfer tube inside and outside wall rot-resistant and oozes the buried Diffusional aluminizing method of case layer, and it is characterized in that: step is:
⑴ prepare various metals and non-metallic material in proportion, at the airtight solid alloy of smelting into below 400 ℃, then this alloy worn into 200 ~ 300 purpose powder, and this powdered alloy is called aluminizing medium;
⑵ will be oozed the workpiece layering and pack into and ooze in the case, then case is in-built to enter aluminizing medium to oozing, case is oozed in limit dress aluminizing medium limit vibration, make that aluminizing medium is tight to be full of in the case between workpiece and workpiece and the institute between workpiece and casing has living space, minimum spacing is 10mm between the workpiece, places 1-2 according to the workpiece size at interlayer and props up thermopair, and thermopair need add metal covering, lead-in wire passes from breather hole, fills it up with behind the aluminizing medium box sealing;
⑶ will ooze case and put in the process furnace, be 700-900 ℃, constant temperature time 4-6h heating by temperature rise speed less than 300 ℃/h, thermostat temperature, ooze afterwards case and come out of the stove;
When ooze the case surface temperature when dropping to below 40 ℃, open ooze the case workpiece with aluminizing medium outlet, workpiece separate with the aluminizing medium agent, workpiece cleaning, the warehouse-in of inspecting for acceptance, penetration enhancer recycling.
2. according to claim 1ly ooze the buried Diffusional aluminizing method of case layer for heat transfer tube inside and outside wall rot-resistant, it is characterized in that: the raw material of described aluminizing medium consists of and weight percentage ranges is:
Aluminium powder 80-85%;
Graphite Powder 99 10%;
Other materials accounts for 5-10%.
3. according to claim 2ly ooze the buried Diffusional aluminizing method of case layer for heat transfer tube inside and outside wall rot-resistant, it is characterized in that: described other materials comprises sodium hydroxide, Sunmorl N 60S, glass powder, NaF, NH
4Cl, refractory mortar, its part by weight is: sodium hydroxide: Sunmorl N 60S: glass powder: NaF:NH
4Cl: refractory mortar=1:0.3:4:1:0.8:15.
4. according to claim 1ly ooze the buried Diffusional aluminizing method of case layer for heat transfer tube inside and outside wall rot-resistant, it is characterized in that: in step ⑵, the part by weight that described aluminizing medium adds total amount is 1% molding sand.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210555843.9A CN103014614B (en) | 2012-12-19 | 2012-12-19 | Permeation tank layered buried type diffusion aluminizing method for prevention of corrosion of inner and outer walls of heat exchange pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210555843.9A CN103014614B (en) | 2012-12-19 | 2012-12-19 | Permeation tank layered buried type diffusion aluminizing method for prevention of corrosion of inner and outer walls of heat exchange pipe |
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| CN103014614A true CN103014614A (en) | 2013-04-03 |
| CN103014614B CN103014614B (en) | 2015-04-15 |
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| CN201210555843.9A Expired - Fee Related CN103014614B (en) | 2012-12-19 | 2012-12-19 | Permeation tank layered buried type diffusion aluminizing method for prevention of corrosion of inner and outer walls of heat exchange pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884218A (en) * | 2014-04-14 | 2014-06-25 | 中钢集团鞍山热能研究院有限公司 | Eccentric type radial heat exchange pipe |
| CN114032495A (en) * | 2021-11-22 | 2022-02-11 | 中国航发贵州黎阳航空动力有限公司 | Packing method for low-temperature aluminizing of steel blade of aircraft engine |
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| RU2100475C1 (en) * | 1995-10-09 | 1997-12-27 | Акционерное общество открытого типа "НОСТА" (ОХМК) | Method of manufacturing corrosion-resistant sheet |
| CN1415783A (en) * | 2002-10-10 | 2003-05-07 | 上海大学 | Method for preparing layer for guarding against pervasion of hydrogen on surface of stainless steel |
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| CN102154618A (en) * | 2011-03-23 | 2011-08-17 | 常州大学 | Method and device for alumetizing with alternating current electric field enhanced powder method |
-
2012
- 2012-12-19 CN CN201210555843.9A patent/CN103014614B/en not_active Expired - Fee Related
Patent Citations (5)
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| RU2100475C1 (en) * | 1995-10-09 | 1997-12-27 | Акционерное общество открытого типа "НОСТА" (ОХМК) | Method of manufacturing corrosion-resistant sheet |
| CN1415783A (en) * | 2002-10-10 | 2003-05-07 | 上海大学 | Method for preparing layer for guarding against pervasion of hydrogen on surface of stainless steel |
| CN1425796A (en) * | 2003-01-06 | 2003-06-25 | 华东理工大学 | Powder embedding calorizing agent and embedding caloriation method |
| CN101255542A (en) * | 2008-01-31 | 2008-09-03 | 江苏工业学院 | Method for accelerating solid power calorizing by DC electric field |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884218A (en) * | 2014-04-14 | 2014-06-25 | 中钢集团鞍山热能研究院有限公司 | Eccentric type radial heat exchange pipe |
| CN114032495A (en) * | 2021-11-22 | 2022-02-11 | 中国航发贵州黎阳航空动力有限公司 | Packing method for low-temperature aluminizing of steel blade of aircraft engine |
| CN114032495B (en) * | 2021-11-22 | 2023-12-05 | 中国航发贵州黎阳航空动力有限公司 | Packaging method for low-temperature aluminizing of steel blade of aeroengine |
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| CN103014614B (en) | 2015-04-15 |
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