CN103014614B - 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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- CN103014614B CN103014614B CN201210555843.9A CN201210555843A CN103014614B CN 103014614 B CN103014614 B CN 103014614B CN 201210555843 A CN201210555843 A CN 201210555843A CN 103014614 B CN103014614 B CN 103014614B
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- workpiece
- case
- aluminizing
- heat exchange
- ooze
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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 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, equipment corrosion problem more and more constitutes a threat to device long-term operation.And common coating antiseptic also exists non-refractory, non-resistance to erosion, the easily defect such as aging, and rely on upgrading material rate greatly will increase to build and drop into, and the anti-H of stainless material
2s corrodibility is not high.Solid-state diffusion aluminizing technology can solve facility investment and the direct contradiction of material erosion resistance well, has good Social and economic benef@.
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, effectively to improve carbon steel equipment to high-sulpur crude anticorrosion ability, reduce equipment cost.
The technical scheme that the present invention realizes object 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 process of the present invention, its overall mechanical properties remains unchanged substantially, and alitizing layer has excellent high temperature oxidation resistance and corrosion resistance nature, and also there is good anti-carburizing and impervious hydrogen, aluminized coating has excellent high temperature resistance S, H within the scope of 240 DEG C ~ 500 DEG C
2s, S0
2, S0
3(corrosive power of ring a heatable brick bed acid >, has excellent anti-H below 120 DEG C in Low Temperature Wet environment with RCOOH
2s, CO, CO
2, NH
3, HCN, HNO
3with the corrosive power of the media such as seawater, especially anti-H
2s corrodes, and has obvious superiority of effectiveness to stainless.
2, of the present invention ooze case structural shape and penetration enhancer proportioning, processing method 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 being applicable to non-HCl environment high-sulpur crude heat-exchange equipment is anticorrosion.
Embodiment
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
For ease of describing whole technical process, first describe the structure of oozing case:
1, oozing case is cuboid, also can be circular (being applicable to pit furnace), comprise casing, case lid and thermopair, and material therefor is δ 20 steel plate (Q235 and more than), and gusset adopts δ 14 steel plate, and casing connects ring flat-plate and adopts δ 26 steel plate; 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 detection, and JB4730-2005 standard I grade is qualified, do not mark leg for comparatively thin pieces thickness, and gusset adopts the weldering of 50*50mm staggered intermittent.
3, every 3000mm arranges a thermopair, and thermopair is arranged on 1/2 box height, and position is placed in the middle, goes between to be passed by breather hole.
4, ooze the outer semicanal welding after workpiece and penetration enhancer fill of case top cover, after welding, ensure No leakage.
A kind of heat transfer tube inside and outside wall rot-resistant that is used for oozes the buried Diffusional aluminizing method of case layer, and step is:
(1) by various metals and non-metallic material, (aluminium powder material accounts for 80-85% by a certain percentage, Graphite Powder 99 material accounts for 10%, and other materials accounts for 6-10%) prepare, airtightly below 400 DEG C smelt into solid alloy, then this alloy is worn into 200 ~ 300 object powder, this powdered alloy is called aluminizing medium;
(2) 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.
(3) will be oozed workpiece oozes in case by horizontal stratification loading, then deployed aluminizing medium is loaded to oozing in case, case is oozed in limit dress aluminizing medium limit vibration, make that aluminizing medium is tight is full of having living space in case between workpiece and workpiece, between workpiece and casing, between workpiece, minimum spacing is 10mm, and place 1-2 according to workpiece size at interlayer and prop up thermopair, thermopair need add metal covering, lead-in wire passes from breather hole, is sealed on request by casing after filling it up with aluminizing medium.
In order to rot-resistant aluminizing medium in heat transfer tube is convenient to cleaning, certain ratio molding sand (ratio 1%) need be increased, to guarantee collapsibility;
(4) will ooze case puts in process furnace, and when being cooled to certain temperature by the process curve intensification of setting, constant temperature, cooling, blowing out, namely temperature rise speed is less than 300 DEG C/h, and thermostat temperature is 700-900 DEG C, oozes case and come out of the stove under constant temperature time 4-6h condition.Ooze case surface when dropping to below 40 DEG C, open ooze that case workpiece is separated with aluminizing medium agent with aluminizing medium together outlet, workpiece, workpiece is cleared up, inspect for acceptance put in storage, penetration enhancer recycles.
The involved in the present invention working mechanism oozing the buried Diffusional aluminizing of case layer:
Ooze the buried Diffusional aluminizing method of case layer and will be oozed workpiece and pack aluminizing agent, by airtight in the casing that necessarily requirement loading one is special, put in process furnace, by certain requirement heating, constant temperature, in heat-processed, in aluminizing medium, there is a series of chemical reaction, make the aluminium atom activation in penetration enhancer thus by aluminium atoms diffuse (diffusion) in the matrix of steel top layer, in the matrix of steel top layer, form the process of one deck ferro-aluminium.
The relation of the tissue of infiltration layer and hardness and aluminium content.
According to ferro-aluminium state graph, along with the increase of aluminium content in infiltration layer, in infiltration layer, there is the Solid solution of aluminium in α iron, Fe 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
3.This layer is the hardest at HV
0.05500 ~ HV
0.05about 650, the aluminium content of this layer is in 45% (wt) left and right;
B second layer major ingredient is A1
4c
3phase, grey is bar-shaped;
C third layer major ingredient is FeAl, hardness value HV
0.05300 ~ HV
0.05about 500, this layer of aluminium content 32% (wt) left and right;
D the 4th layer of major ingredient is Fe
3a1, hardness is at HV
0.05less than 400, this layer of aluminium content is below 14%;
The Solid solution of e layer 5 Al in α iron, hardness is at HV
0.05less than 300, aluminium content at 10% (wt) below.
F layer 6 is carbon-poor area.
G layer 7 is carbon-rich zone.
Aluminized coating is divided into above seven layers to be only theoretic statement, and some layer may not exist actually, even if some exists interlayer also do 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 particular circumstances, then this alloy worn into 200 ~ 300 object powder, this powdered alloy is called aluminizing medium.Its effect has following four:
One is as thermal barrier, makes by the workpiece thermally equivalent of its embedding;
Two be as packing material, be tightly full of workpiece and workpiece, workpiece and ooze having living space between case, workpiece cannot be out of shape;
Three is that this penetration enhancer has the floating rust function of removing workpiece surface, some composition when being heated to certain temperature in penetration enhancer and the ferric oxide generation chemical reaction on workpiece, the rust on removing workpiece; Because being that penetration enhancer reacts in heat-processed with the aluminium powder mixed wherein, energizer etc., aluminium atom activation is made to reach the condition entering steel surface matrix.
1. penetration enhancer, heat transfer tube layering are seated in and ooze in case, change length according to heat exchange, ooze case and can be divided into vertical, horizontal;
2. in case, thermopair is set, is convenient to carry out temperature control;
3. adopt pressed powder covering to bury, contact is abundant, diffusion is even, and workpiece does not need acid pickling and rust removing.No acidic pollutant emission in process of production;
4. be that penetration enhancer can life-time service, significantly reduce production cost.
Claims (2)
1. ooze the buried Diffusional aluminizing method of case layer for heat transfer tube inside and outside wall rot-resistant, it is characterized in that: step is:
(1) various metals and non-metallic material are prepared in proportion, airtightly below 400 DEG C smelt into solid alloy, then this alloy is worn into 200 ~ 300 object powder, this powdered alloy is called aluminizing medium;
(2) will be oozed workpiece layering loading oozes in case, then to ooze case in-built enter aluminizing medium, case is oozed in limit dress aluminizing medium limit vibration, make that aluminizing medium is tight is full of having living space in case between workpiece and workpiece and between workpiece and casing, between workpiece, minimum spacing is 10mm, and place 1-2 according to workpiece size at interlayer and prop up thermopair, thermopair adds metal covering, lead-in wire passes from breather hole, fills it up with box sealing after aluminizing medium;
(3) will ooze case puts in process furnace, is less than 300 DEG C/h, thermostat temperature is 700-900 DEG C, constant temperature time 4-6h heats, ooze case afterwards and come out of the stove by temperature rise speed;
(4) when oozing case surface temperature and dropping to below 40 DEG C, open ooze case, workpiece is separated with aluminizing medium with aluminizing medium together outlet, workpiece, workpiece is cleared up, inspect for acceptance put in storage, penetration enhancer recycles;
The raw material of described aluminizing medium forms and weight percentage ranges is:
Aluminium powder 80-85%;
Graphite Powder 99 10%;
Other materials accounts for 5-10%;
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.
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: step (2) in, the part by weight that described aluminizing medium adds total amount is the molding sand of 1%.
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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 CN103014614A (en) | 2013-04-03 |
| CN103014614B true 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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| 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 |
| 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 |
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 |
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Non-Patent Citations (1)
| Title |
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| 胡亚娥,徐金富,单丽云,王秉芳.用石墨作填充剂的粉末渗铝工艺.《新技术新工艺》.1996,(第03期), * |
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