CN101660116A - Hot dipping alumetizing process of steel radiator - Google Patents
Hot dipping alumetizing process of steel radiator Download PDFInfo
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- CN101660116A CN101660116A CN200910017800A CN200910017800A CN101660116A CN 101660116 A CN101660116 A CN 101660116A CN 200910017800 A CN200910017800 A CN 200910017800A CN 200910017800 A CN200910017800 A CN 200910017800A CN 101660116 A CN101660116 A CN 101660116A
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Abstract
The invention discloses a hot dipping alumetizing process of a steel radiator, which comprises the following process steps: carrying out caustic wash, water wash, acid wash and water wash on the radiator sequentially and then carrying out plating assistant treatment on the washed radiator in a plating assistant trough, placing the radiator treated by a plating assistant agent in a preheating electric furnace for preheating and carrying out salt-bath treatment before hot dipping alumetizing for ensuring that no plating leakage is generated in the interior and the exterior of the radiator and the thickness of a plating layer is even and consistent; and placing the radiator subjected to preheating and salt bath in a fused aluminum liquid vessel for hot dipping alumetizing, carrying out hot dipping alumetizing on the radiator, then removing solvent on the surface of the plating layer of the radiator the temperature of which is cooled to room temperature, simultaneously carrying out passivating treatment on an aluminized layer and substrate quality inspection on the radiator subjected to the passivating treatment, performing plastic spraying on the finished radiator and packaging and warehousing after passing the inspection. The hot dipping alumetizing process of the steel radiator can carry out hot dipping alumetizing on steel radiators or accessories; and products produced by themethod have the characteristics of high temperature resistance, corrosion resistance and long service life.
Description
Technical field
The present invention relates to the steel work rotproofing, be specially a kind of hot dipping alumetizing process of steel radiator.
Background technology
The annual steel radiator of scrapping because of corrosion in the whole nation is up to nearly 1,000,000 tons.Scatterer is widely used in heating, heat radiation, the heat exchange occasion of the architectural environment of every field such as factory, office, school.The main objective factor in decision scatterer work-ing life is the corrosion resistance of metal; For scatterer provides the medium of thermal source mainly is water and steam, and the corrosion of the corrosive goods confrontation steel that oxygen that they are contained and water, vapour are contained is a great problem that perplexs steel radiator at present.It requires water oxygen level to be not more than 0.05 gram/cubic meter, although the hot water that provides scatterer to use is handled through anti-oxygen, but owing to multiple reason, large-area central heating mode can't make total system airtight, can't be isolated thereby cause with oxygen, system is difficult to carry out the full water maintenance after stopping heat supply in addition, like this, oxygen level in the heating system just is above standard, the use of steel, Aluminium Radiator has certain requirement to heating agent, oxidation corrosion can't be avoided, and particularly under dampness, oxidation is more serious.Contain the material that inorganic salt, sulfide, nitride, organic salt, oxygen, carbonic acid gas, moisture content etc. have highly corrosive in the scatterer in the working medium in addition, so the scatterer of carbon steel manufacturing has only 2 or three years work-ing life at least, 5 or six years at most; The scatterer corrosion of adopting steel alloy to make in addition is also very serious, and maximum local corrosion speed is up to more than the 0.5mm/, and average corrosion rate also reaches 0.5～1.0mm/.Why scatterer has so high corrosion damage rate, and except that the factor of manufactured materials, its one of the main reasons is because the manufacturing technology of present scatterer and the carrying out that aseptic technic all can not well prevent or control corrosion damage.Because the shell-and-tube scatterer is to adopt metallic substance to make by it by punch and weld, tube sheet or radiating pipe connect mode by welding, expanded joint or expanded and welded tube joint and couple together, produce remaining welding stress at the weld bond or mouthful place of expanding, or remnants dilate drawing stress, the tensile stress that causes of the operating operating pressure of equipment in addition, make the radiating pipe joint form vulnerable zone, in corrosive medium, very easily produce stress corrosion fracture; The gap that exists when the welding of heat radiation tube and tube enters among the slit electrolyte solution, and stagnates therein in addition, has more aggravated corrosion.Therefore steel, Aluminium Radiator must carry out interior rotproofing.The manufacturer that has adopts bonderizing, produces little effect.Recently, the man of production company that also has adopts organic coating coating lumen of radiator with anticorrosion, receives certain effect, but this ADHESION OF PAINTS power, how abrasion resistance waits to observe.In addition, from the species analysis of coating, wherein contain metal oxide, in case coating is irregular, even a slight bubble occurs, will form the electrochemical metal corrosion, its corrosion speed is faster; In addition, the ferrous materials scatterer is carried out surface protection, improve its work-ing life, to all increasing in the antiseptic property and work-ing life of scatterer, but internal corrosion can't solve.Replace the anticorrosive measure of steel pipe, aluminum pipe extensively to be adopted by man of scatterer company at present with copper pipe, copper is good thermally conductive material, and the performance of its resistance to oxidation and caustic corrosion is all good.As the water flowing parts, can improve the work-ing life of scatterer with copper pipe greatly, avoid because of leaking that nonstandard heating system causes, but involve great expense, one-time investment is increased greatly.
Summary of the invention
The objective of the invention is in order to overcome the deficiency that above-mentioned technology exists, a kind of a kind of hot dipping alumetizing process of steel radiator that can carry out hot-dip aluminizing using to the scatterer or the accessory of plain carbon stool or steel alloy manufacturing is provided, and that the product of producing through the inventive method has is high temperature resistant, the characteristics of protection against corrosion, long service life.
The present invention is achieved through the following technical solutions for achieving the above object: its processing step is:
1. scatterer is carried out alkali cleaning-washing-pickling-washing, check the heat sink structure to reach the qualified product standard again;
2. scatterer is packed in the container;
3. before the scatterer infiltration 1. step is repeated alkali cleaning-washing-pickling-washing process again through the good scatterer of clean process;
4. step (3) being helped through the scatterer of alkali cleaning-washing-pickling-washing helps plating to handle in the coating bath, helping the plating assistant agent of inserting in the coating bath is the settled solution that the aluminum fluoride by 30～60% Repone K, 15～45% sodium-chlor, 10～40% sodium aluminum fluoride and 5～30% makes, adding the water compound concentration reaches near saturated, to help the plating assistant agent heating in the coating bath again, the Heating temperature of plating assistant agent is 70～90 ℃, and plating assistant agent soaking time in helping coating bath is 5～10 minutes;
5. place electric preheating furnace to carry out preheating in the scatterer of step (4) after plating assistant agent is handled, according to scatterer difference temperature gap electric heating tube is controlled automatically, guarantee that scatterer evenly heats up in warm, the hot temperature of its maximum prefetch is 300 ℃, about 1 hour heating-up time;
6. do not produce plating leakage and thickness of coating uniformity for guaranteeing inside and outside the scatterer, before hot-dip aluminizing using, carry out salt bath and handle; Being formulated as of described salt bath: preparation fused salt fusing point is 640 ℃, and treatment temp is 680～710 ℃; Fused salt is by Nacl30～43%, Kcl30～40%, Na3AlF69～16%, AlF63～6% mixed preparing, fused salt after the preparation is thoroughly fusing in salt pan, each before production and after producing a week, all needs flux to be purified with the magnesium fluoride of fused salt total amount 1～3%, and thoroughly removing be suspended on the saline solution or aluminium liquid among impurity; The flux treatment time is 0.5～2 hour, scatterer the rotation with the state of moving up and down under contact with saline solution;
7. the scatterer behind preheating and the salt bath is inserted and carry out hot-dip aluminizing using in the molten aluminum liquid container, used aluminium is the Raw Aluminium of the above purity of AOO, and temperature of aluminum liquid is controlled at 630～720 ℃, and the infiltration time is 20～60 minutes; Scatterer is in all the time in infiltration process and moves up and down and rotating state, and translational speed is 2～6 meters/minute, forms the iron aluminide alloy layer of 30～100 μ m and the aluminum layer of 30～70 μ m on the surface of steel matrix;
8. after 6. and 7. step carries out hot-dip aluminizing using with scatterer, scatterer is proposed to add stay-warm case behind the aluminum pot, stay-warm case is for telescopic automatically, scatterer after aluminizing moves on at once and spreads in the holding furnace and slow cooling, described diffusion holding furnace divides two sections, the expansion section temperature is 680 ℃, and the holding-zone temperature is 600--200 ℃, and expansion section should guarantee that scatterer is incubated 1-2 hour about 700 ℃; Holding-zone should guarantee that scatterer is incubated 1-2 hour about 600 ℃, slowly cooling uniformly then, the temperature difference of scatterer each point is no more than 50 ℃ in process of cooling, and the temperature drop speed control is about 100 ℃/hour, in the time of below the slow cooling to 100 ℃, scatterer is proposed stove carry out naturally cooling outward; When the temperature of scatterer be 680～700 ℃ put into holding furnace after, temperature can reach 670～680 ℃ and spread gentle slow cool down in the stove, quickens the fine aluminium surface by comparatively high temps in the holding furnace and forms AL with atmospheric oxidation
2O
3Passivation film;
9. with behind the scatterer hot-dip aluminizing using of step in 8., the scatterer of cool to room temperature is removed the flux of scatterer coating surface, simultaneously aluminium coated is carried out Passivation Treatment, the scatterer after the Passivation Treatment is carried out substrate quality inspection, finishing;
10. the 9. middle quality inspection of step, finishing back scatterer are carried out plastic-blasting, passed examination packing warehouse-in;
Described scatterer is the finished product scatterer, also can be header, tubing string and the screw thread accessory of scatterer, is welded as finished product again after hot dipping alumetizing process is handled.
Beneficial effect of the present invention is: adopt to add small amount of aluminum in the iron and steel metal, just can improve its performance greatly.Adopt the soft steel aluminising, make the acid and alkali-resistance ferro-aluminium that forms resistant to elevated temperatures pellumina and one deck densification on the plain carbon stool surface,, increase substantially the scatterer life-span to protect inner iron.Can anti-SO behind the steel hot-dip aluminizing using
2, SO
3, H
2S, NH
3, CO
2, number of chemical medium such as crude oil, seawater, organic acid corrosion.Its solidity to corrosion more not aluminising carbon steel improves several times to tens times.In manufacturing district atmosphere, ocean and rural environment, the hot-dip aluminizing using steel are corrosion proof 5 times-10 times of hot dipping zincizing steel; Under 500 ℃ of continuous heating conditions, hot-dip aluminizing using is 50 times of hot dipping zincizing steel life-span; 900 ℃ of heating continuously, the hot-dip aluminizing using steel life-span is equivalent to the 18-8 heat-resistance stainless steel.The stainless premium properties of surpassing is arranged on sea water resistance, anti-sulfide corrosion.This is that the surface generates Al-Fe alloy layer and pure Al layer after aluminizing because of steel, and purified back generates the Al of densification at outermost layer
2O
3Protective layer, its corrosion potential lies prostrate than balance aluminum current potential rising 0.1--1.Test and facts have proved that hot-dipped aluminum steel all is anti-corrosion in the number of chemical medium solution all has enough stability in most neutral and weakly acidic solution.Adopt steel behind hot-dip aluminizing using, to be made into scatterer, or adopt steel to produce scatterer by existing method, again radiator integral is carried out hot-dip aluminizing using, make parts such as scatterer vertical tube (or transverse tube), header, weld under the same process condition, plate the aluminized coating protective treatment simultaneously
Radiator integral hot-dip aluminizing using of the present invention and parts hot-dip aluminizing using scatterer are at a lower temperature to SO
2And H
2The anti-uniform corrosion basically identical of corrosive mediums such as S is far above nickel-chrome alloy steel.On the sea water resistance uniform corrosion several times to tens times of carbon steel.More than 700 ℃ the time,, overcome the shortcoming of fine aluminium plating exfoliation mainly based on high temperature oxidation.Overall thermal infiltration aluminium radiator can be eliminated welding and more than 80% of expanded joint unrelieved stress, has controlled the generation of stress corrosion widely, and has not produced crevice corrosion basically.Overall thermal infiltration aluminium radiator welds before aluminising, need not improve weldprocedure, and weldquality has abundant guarantee, and weldquality also is significantly increased after aluminizing.Behind the heat sink assembly of the welding infiltration aluminium, do not assemble welding, adopt TIG or MIG welding, guaranteed the solidity to corrosion of weld, improved the use properties of scatterer.By the present invention the scatterer of plain carbon stool or steel alloy manufacturing is carried out hot-dip aluminizing using, can produce high temperature resistant, protection against corrosion, resistance to wear, the scatterer of long service life.
Embodiment
A kind of hot dipping alumetizing process of steel radiator of the present invention, its processing step is:
1. scatterer is carried out alkali cleaning-washing-pickling-washing, check the heat sink structure to reach the qualified product standard again;
2. scatterer is packed in the container;
3. before the scatterer infiltration 1. step is repeated alkali cleaning-washing-pickling-washing process again through the good scatterer of clean process;
4. step (3) being helped through the scatterer of alkali cleaning-washing-pickling-washing helps plating to handle in the coating bath, helping the plating assistant agent of inserting in the coating bath is the settled solution that the aluminum fluoride by 30～60% Repone K, 15～45% sodium-chlor, 10～40% sodium aluminum fluoride and 5～30% makes, adding the water compound concentration reaches near saturated, to help the plating assistant agent heating in the coating bath again, the Heating temperature of plating assistant agent is 70～90 ℃, and plating assistant agent soaking time in helping coating bath is 5～10 minutes;
5. place electric preheating furnace to carry out preheating in the scatterer of step (4) after plating assistant agent is handled, according to scatterer difference temperature gap electric heating tube is controlled automatically, guarantee that scatterer evenly heats up in warm, the hot temperature of its maximum prefetch is 300 ℃, about 1 hour heating-up time;
6. do not produce plating leakage and thickness of coating uniformity for guaranteeing inside and outside the scatterer, before hot-dip aluminizing using, carry out salt bath and handle; Being formulated as of described salt bath solution: preparation fused salt fusing point is 640 ℃, and treatment temp is 680～710 ℃; Fused salt is by Nacl30～43%, Kcl30～40%, Na3AlF69～16%, AlF63～6% mixed preparing, fused salt after the preparation is thoroughly fusing in salt pan, each before production and after producing a week, all needs flux to be purified with the magnesium fluoride of fused salt total amount 1～3%, and thoroughly removing be suspended on the saline solution or aluminium liquid among impurity; The flux treatment time is 0.5～2 hour, scatterer the rotation with the state of moving up and down under contact with saline solution;
7. the scatterer behind preheating and the salt bath is inserted and carry out hot-dip aluminizing using in the molten aluminum liquid container, used aluminium is the Raw Aluminium of the above purity of AOO, and temperature of aluminum liquid is controlled at 630～720 ℃, and the infiltration time is 20～60 minutes; Scatterer is in all the time in infiltration process and moves up and down and rotating state, and translational speed is 2～6 meters/minute, forms the iron aluminide alloy layer of 30～100 μ m and the aluminum layer of 30～70 μ m on the surface of steel matrix;
8. after 6. and 7. step carries out hot-dip aluminizing using with scatterer, scatterer is proposed to add stay-warm case behind the aluminum pot, stay-warm case is for telescopic automatically, scatterer after aluminizing moves on at once and spreads in the holding furnace and slow cooling, described diffusion holding furnace divides two sections, the expansion section temperature is 680 ℃, and the holding-zone temperature is 600--200 ℃, and expansion section should guarantee that scatterer is incubated 1-2 hour about 700 ℃; Holding-zone should guarantee that scatterer is incubated 1-2 hour about 600 ℃, slowly cooling uniformly then, the temperature difference of scatterer each point is no more than 50 ℃ in process of cooling, and the temperature drop speed control is about 100 ℃/hour, in the time of below the slow cooling to 100 ℃, scatterer is proposed stove carry out naturally cooling outward; When the temperature of scatterer be 680～700 ℃ put into holding furnace after, temperature can reach 670～680 ℃ and spread gentle slow cool down in the stove, quickens the fine aluminium surface by comparatively high temps in the holding furnace and forms AL with atmospheric oxidation
2O
3Passivation film;
9. with behind the scatterer hot-dip aluminizing using of step in 8., the scatterer of cool to room temperature is removed the flux of scatterer coating surface, simultaneously aluminium coated is carried out Passivation Treatment, the scatterer after the Passivation Treatment is carried out substrate quality inspection, finishing;
10. the 9. middle quality inspection of step, finishing back scatterer are carried out plastic-blasting, passed examination packing warehouse-in;
Scatterer of the present invention is the finished product scatterer, also can be header, tubing string and the screw thread accessory of scatterer, is welded as finished product again after hot dipping alumetizing process is handled.
In the processing step of the present invention, scatterer or the heat sink assembly infiltration aluminium time in aluminum pot is 20～30 minutes, and infiltration aluminium temperature is controlled between 630～710 ℃; Adopt two-bath process and to steel matrix wetting property fused salt prescription preferably, in salt pan scatterer or heat sink assembly are carried out thorough salt bath and handle, the fused salt prescription is: NaCL 43%, KCL 37%, Na
3ALF
616%, ALF
34%, fused salt fusing point 600--650 ℃, salt bath is to carry out in salt pan; When infiltration aluminium scatterer or heat sink assembly are rotated and move up and down, speed of rotation, the speed of moving up and down are 2～6 meters of per minutes; Can form the ferroaluminium layer of 50～100 μ m and the aluminum layer of 50～70 μ m on the surface of steel matrix; Scatterer behind the process hot-dip aluminizing using moves on at once and spreads in the holding furnace and slow cooling, the diffusion holding furnace divides two sections, the expansion section temperature is 680 ℃, preheating temperature is 200 ℃, this moment scatterer temperature be 680～700 ℃ put into holding furnace after, temperature can reach 670～680 ℃ and spread gentle slow cool down in the stove, so comparatively high temps can quicken fine aluminium surface and atmospheric oxidation formation AL in the holding furnace
2O
3Passivation film; For eliminating the unrelieved stress after scatterer is processed, the salt pot temperature is controlled in 700 ℃, and the treatment time of scatterer in salt pan is 1 hour; The aluminum pot temperature is controlled in 720 ℃, and scatterer or the heat sink assembly treatment time in aluminum pot is 30 minutes; Temperature was controlled at 680 ℃ after the inherent workpiece of holding furnace advanced stove, was incubated 1 hour 30 minutes; Scatterer is operation 2 hours under 680～720 ℃ temperature in above equipment, stops to heat not changing metallographic structure; Scatterer from salt pan move to aluminum pot, when aluminum pot moves to holding furnace again, when scatterer proposes, just carry additionally stay-warm case from top to bottom from pot, scatterer is exposed among the air, the temperature in the stay-warm case is controlled at 640～660 ℃; Carry out preheat requirements for adapting to plating assistant agent processing back scatterer, the formula constituent of plating assistant agent is: NaCL 3%, KCL 3%, ZnCL 91%, NaF 3%, and the plating assistant agent temperature is controlled at more than 90 ℃, and concentration is saturated solution; For guaranteeing not produce plating leakage and thickness of coating uniformity inside and outside the scatterer, increase the flowability of fused salt, preparation fused salt fusing point is 640 ℃, treatment temp is 680～710 ℃; Scatterer contacts with saline solution, aluminium liquid under rotation and the state of moving up and down, and guarantees the uniform distribution of ferroaluminium in the uniformity, aluminum pot of various components in the salt pan; In the scatterer salt bath is handled forward direction salt pan or aluminum pot, add 2～5% magnesium fluoride, and thoroughly remove be suspended on the saline solution or aluminium liquid among impurity; Be the control temperature stress, guarantee device geometrical dimension and shape, adopt the heating of vertical preheating oven and electrothermal tube, electrothermal tube be distributed as that bottom distributes and the furnace wall distribution combines, the total power of electrothermal tube is about 100KW, about the 60KW of bottom, about the 40KW of furnace wall; The internal heat air circulating system is set in preheating oven, and the hot blast that temperature is high is extracted out from the bottom, carries downwards by pipeline; Electrothermal tube is divided into 3 groups of controls, and the bottom is one group, and the furnace wall part is two groups; Preheating: before scatterer did not enter preheating oven, preheating oven carried out preheating earlier, puts into workpiece when preheating temperature reaches 200 ℃, and to the energising of bottom heating tube, carried out hot air circulation, and then the furnace wall heating tube is switched on; Temperature in 3-5 the thermocouple measurement stove is installed in the preheating oven, and 3 thermopairs are arranged in outermost layer, middle layer and the innermost layer of stove, by control switch on and power off time make interior, in, the temperature difference of outer 3 thermopairs is not more than 50 ℃; In the furnace wall of preheating oven, disrance sleeve is installed, to reduce the direct radiation of electric heating tube to the scatterer outer tube; The diffusion leer must guarantee scatterer or the slowly cooling of heat sink assembly diffusion back behind the dip calorizing, put into diffusion leer beginning half an hour at scatterer or heat sink assembly, guarantee 680 ℃ of homo(io)thermism of furnace temperature, begin slow cooling after half an hour, slow cooling speed is 600 ℃/hour, when cooling temperature reaches 100 ℃, open bell gradually, infiltration part cool to room temperature is proposed in stove.The integral heat sink device that welding of the present invention is good further carries out carrying out plastic-blasting, packing back warehouse-in after the surface treatment; Behind the heat sink assembly of the welding infiltration aluminium, do not assemble welding, adopt TIG or MIG welding, guarantee the solidity to corrosion of weld.Carry out surface treatment after the assembling welding, carry out plastic-blasting, packing back warehouse-in then.The present invention not detailed description is a known technology.
Claims (2)
1, a kind of hot dipping alumetizing process of steel radiator is characterized in that: its processing step is:
1. scatterer is carried out alkali cleaning-washing-pickling-washing, check the heat sink structure to reach the qualified product standard again;
2. scatterer is packed in the container;
3. before the scatterer infiltration 1. step is repeated alkali cleaning-washing-pickling-washing process again through the good scatterer of clean process;
4. step (3) being helped through the scatterer of alkali cleaning-washing-pickling-washing helps plating to handle in the coating bath, helping the plating assistant agent of inserting in the coating bath is the settled solution that the aluminum fluoride by 30～60% Repone K, 15～45% sodium-chlor, 10～40% sodium aluminum fluoride and 5～30% makes, adding the water compound concentration reaches near saturated, to help the plating assistant agent heating in the coating bath again, the Heating temperature of plating assistant agent is 70～90 ℃, and plating assistant agent soaking time in helping coating bath is 5～10 minutes;
5. place electric preheating furnace to carry out preheating in the scatterer of step (4) after plating assistant agent is handled, according to scatterer difference temperature gap electric heating tube is controlled automatically, guarantee that scatterer evenly heats up in warm, the hot temperature of its maximum prefetch is 300 ℃, about 1 hour heating-up time;
6. do not produce plating leakage and thickness of coating uniformity for guaranteeing inside and outside the scatterer, before hot-dip aluminizing using, carry out salt bath and handle; Being formulated as of described salt bath: the fused salt fusing point is 640 ℃, and treatment temp is 680～710 ℃; Fused salt is by Nacl30～43%, Kcl30～40%, Na3AlF69～16%, AlF63～6% mixed preparing, fused salt after the preparation is thoroughly fusing in salt pan, each before production and after producing a week, all needs flux to be purified with the magnesium fluoride of fused salt total amount 1～3%, and thoroughly removing be suspended on the saline solution or aluminium liquid among impurity; The flux treatment time is 0.5～2 hour, scatterer the rotation with the state of moving up and down under contact with saline solution;
7. the scatterer behind preheating and the salt bath is inserted and carry out hot-dip aluminizing using in the molten aluminum liquid container, used aluminium is the Raw Aluminium of the above purity of A00, and temperature of aluminum liquid is controlled at 630～720 ℃, and the infiltration time is 20～60 minutes; Scatterer is in all the time in infiltration process and moves up and down and rotating state, and translational speed is 2～6 meters/minute, forms the ferroaluminium layer of 30～100 μ m and the aluminum layer of 30～70 μ m on the surface of steel matrix;
8. after 6. and 7. step carries out hot-dip aluminizing using with scatterer, scatterer is proposed to add stay-warm case behind the aluminum pot, stay-warm case is for telescopic automatically, scatterer after aluminizing moves on at once and spreads in the holding furnace and slow cooling, described diffusion holding furnace divides two sections, the expansion section temperature is 680 ℃, and the holding-zone temperature is 600--200 ℃, and expansion section should guarantee that scatterer is incubated 1-2 hour about 700 ℃; Holding-zone should guarantee that scatterer is incubated 1-2 hour about 600 ℃, slowly cooling uniformly then, the temperature difference of scatterer each point is no more than 50 ℃ in process of cooling, and the temperature drop speed control is about 100 ℃/hour, in the time of below the slow cooling to 100 ℃, scatterer is proposed stove carry out naturally cooling outward; When the temperature of scatterer be 680～700 ℃ put into holding furnace after, temperature can reach 670～680 ℃ and spread gentle slow cool down in the stove, quickens the fine aluminium surface by comparatively high temps in the holding furnace and forms AL with atmospheric oxidation
2O
3Passivation film;
9. with behind the scatterer hot-dip aluminizing using of step in 8., the scatterer of cool to room temperature is removed the flux of scatterer coating surface, simultaneously aluminium coated is carried out Passivation Treatment, the scatterer after the Passivation Treatment is carried out substrate quality inspection, finishing;
10. the 9. middle quality inspection of step, finishing back scatterer are carried out plastic-blasting, passed examination packing warehouse-in.
2, a kind of hot dipping alumetizing process of steel radiator according to claim 1 is characterized in that: described scatterer is the finished product scatterer, also can be header, tubing string and the screw thread accessory of scatterer, is welded as finished product again after hot dipping alumetizing process is handled.
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| CN103205744A (en) * | 2012-01-12 | 2013-07-17 | 江苏嘉和热系统股份有限公司 | Novel surface treatment technology of aluminum alloy for radiator |
| CN103276348A (en) * | 2013-06-08 | 2013-09-04 | 上海汇森益发工业炉有限公司 | Aluminized structure of structural member in nitriding furnace, and construction method thereof |
| CN103419004A (en) * | 2012-05-17 | 2013-12-04 | 宝山钢铁股份有限公司 | Method for machining dry quenching pre-heater radial heat exchange tube |
| CN106244965A (en) * | 2016-07-29 | 2016-12-21 | 全椒赛德利机械有限公司 | A kind of hot dipping alumetizing process of steel radiator |
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| CN108660413A (en) * | 2018-05-29 | 2018-10-16 | 佛山市高明利钢精密铸造有限公司 | A kind of manufacturing method of alumetized steel |
| CN108677122A (en) * | 2018-05-29 | 2018-10-19 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of high rigidity alumetized steel |
| CN108844846A (en) * | 2018-04-04 | 2018-11-20 | 中国科学院力学研究所 | A kind of sampling and test method of the test of round-link chain alumetized steel high-temperature oxydation |
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| CN103205744A (en) * | 2012-01-12 | 2013-07-17 | 江苏嘉和热系统股份有限公司 | Novel surface treatment technology of aluminum alloy for radiator |
| CN103205744B (en) * | 2012-01-12 | 2015-08-19 | 江苏嘉和热系统股份有限公司 | A kind of process of surface treatment of radiator aluminum alloy |
| CN103419004A (en) * | 2012-05-17 | 2013-12-04 | 宝山钢铁股份有限公司 | Method for machining dry quenching pre-heater radial heat exchange tube |
| CN103276348A (en) * | 2013-06-08 | 2013-09-04 | 上海汇森益发工业炉有限公司 | Aluminized structure of structural member in nitriding furnace, and construction method thereof |
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| CN108660413A (en) * | 2018-05-29 | 2018-10-16 | 佛山市高明利钢精密铸造有限公司 | A kind of manufacturing method of alumetized steel |
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