CN105534318A - Long-acting magnetic-conductive and anti-corrosion composite coating for electromagnetic cooker and preparation method of composite coating - Google Patents
Long-acting magnetic-conductive and anti-corrosion composite coating for electromagnetic cooker and preparation method of composite coating Download PDFInfo
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- CN105534318A CN105534318A CN201510814503.7A CN201510814503A CN105534318A CN 105534318 A CN105534318 A CN 105534318A CN 201510814503 A CN201510814503 A CN 201510814503A CN 105534318 A CN105534318 A CN 105534318A
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
Abstract
The invention discloses a long-acting magnetic-conductive and anti-corrosion composite coating for an electromagnetic cooker and a preparation method of the composite coating. The composite coating is characterized in that a metal magnetic-conductive coating and an anti-corrosion protective coating are prepared on the surface of a roughened non-magnetic-conductive metal substrate by virtue of a thermal spraying method. The prepared long-acting magnetic-conductive and anti-corrosion composite coating is 200-400[micron]m thick; and the coating has the characteristics of being uniform and dense, low in porosity, good in bonding strength with the substrate, excellent in thermal shock resistance, excellent in corrosion resistance and the like. The composite coating prepared by the method is applicable to the industry of household electromagnetic cooker cooking utensil; and the composite coating is capable of significantly reducing the production cost of the current electromagnetic cooker cooking utensil industry and prolonging the service life of the electromagnetic cooker, and the composite coating is good in application prospect and economic benefits.
Description
Technical field
The present invention relates to electromagnetic cooker magnetic conduction coat preparing technology field, particularly relate to anti-corrosion composite coating of the long-acting magnetic conduction of a kind of electromagnetic cooker and preparation method thereof.
Background technology
Along with the raising of people's living standard and the raising of energy-saving and environmental protection consciousness, increasing family brings into use electromagnetic oven to heat stove and accessory as kitchen.Electromagnetic oven is a kind of novel household electrical appliance, its rely on the advantage such as convenient, fast accept by consumers in general.Through the development of more than 20 years, electromagnetic oven can be fried food, explode, steam, the processing, controlled firepower such as to boil, easy to operate.Compared with traditional kitchen range, have that the thermal efficiency is high, security good, an advantage such as sanitation and hygiene, culinary art are effective, low cost.The cooker mainly ferrous metal cooker that uses on tradition electromagnetic oven, but there is the problems such as easy corrosion, heat transfer efficiency are low, not energy-conservation, unhygienic in iron cooker, and therefore novel non iron cooker arises at the historic moment.Non iron cooker mainly contains aluminium, tin, titanium and titanium alloys etc.These non iron cookers have energy-conservation, heat transfer is fast, environmental protection, health, not easily the advantage such as to get rusty, but these materials are non-magnet materials, can not directly use on electromagnetic oven, therefore greatly limit their scope of application.
Along with the development of society, the renewal of technology, the method making non-magnetic cooker possess magnetic property at present mainly contains: (1) cladding process, namely at non-magnetic cooking utensils outer surface coating magnetic conductive metal layer, again at its surface coating protection finish paint, realize cooker magnetic conduction and antirust object; (2) iron plate casting die, namely on non-magnetic cookware base die casting iron plate, achieves magnetic conduction.There is complex process in these methods, the problems such as equipment cost is high, and service life is short, not energy-conserving and environment-protective, anti-corrosion composite coating of long-acting magnetic conduction therefore needing development of new badly and preparation method thereof, reduces production cost, realize environmental protection, the object of economize energy.
Thermal spraying is a kind of conventional surface treatment technology of material, it utilizes flame, plasma flame flow, electric arc (to wait thermal source that the solid-state material of Powdered (or thread or bar-shaped) is heated to melting or semi-molten state, and accelerate or accelerate after atomization) form high speed molten drop, with high-speed impact matrix, be deposited on matrix surface through flattening, fast cooled and solidified and form tectal method.Adopt heat spraying method can prepare at the material surface such as metal, pottery the coating satisfied the demands, and the effective technology that thermal spraying has not by workpiece size, advantage that deposition efficiency is higher and little to matrix material heat affecting, is a kind of high efficiency, low cost prepares Large area coatings.Domestic and international in cooker manufacture field at present, plasma spray technology is not also widely used, and chief reason is the surface roughness problem also not having effectively to solve cooker surface hot-spraying coating.By the improvement of the aspect such as spraying coating process, sprayed on material, the anti-corrosion composite coating of New-type long-acting magnetic conduction that exploitation composite cooker industry uses is the important directions of Future Development.
Summary of the invention
Technical purpose of the present invention is to develop anti-corrosion composite coating of the long-acting magnetic conduction of a kind of electromagnetic cooker and preparation method thereof, thus realizes non-magnetic metal cooking appliance and realize long-acting magnetic conduction and anti-corrosion.The method technique is simple and easy to control, with low cost, is particularly suitable for suitability for industrialized production, has a good application prospect and economic benefit.
The present invention realizes the technical scheme that above-mentioned technical purpose adopts: utilize plasma spray technology to prepare metal magnetic conducting coating and anti-corrosion protective coating at the non-magnetic metal base surface after alligatoring, the coating layer thickness of preparation is 200-400 μm, coating possesses even compact, porosity is low, coating and substrate bond strength good, the feature such as thermal shock resistance, excellent anti-corrosion performance, its preparation process as shown in Figure 1.
As preferably, described composite coating material comprises metal magnetic conducting coating and anti-corrosion protective coating, and wherein metal magnetic conducting coating material includes but not limited to ingot iron, pure iron (DT1), pure iron (DT2), pure iron (DT3), silicon steel, permalloy, magnetic stainless steel 430, iron-zinc alloy.Anti-corrosion barrier material includes but not limited to nickel aluminium, aluminium, zinc, alumin(i)um zinc alloy, copper, titanium, nickel chromium triangle titanium, nickel 60 and other nickel-base alloys.
As preferably, described matrix is that non-magnetic metallic substrates includes but not limited to Aluminum-aluminum alloy material.
As preferably, described plasma spray technology includes but not limited to electric arc spraying, HVAF, flame-spraying and cold spraying.
In the present invention, a kind of electromagnetic cooker preparation method of the anti-corrosion composite coating of long-acting magnetic conduction comprises the steps:
Step 1: matrix is carried out clean, degreasing and rust removal and surface coarsening;
Step 2: adopt heat spraying method to prepare layer of metal magnetic conduction coating at the matrix surface processed through step 1;
Step 3: adopt heat spraying method to prepare the anti-corrosion protective coating of one deck at the matrix surface processed through step 2.
In described step 1, method for coarsening surface includes but not limited to sandblasting, cutting thread, annular knurl or electric plucking.
In described step 2, plasma spray technology includes but not limited to: electric arc spraying, HVAF, flame-spraying and cold spraying.Wherein preferably arc spray process prepares magnetic conduction coating, and the preferable range of its spray parameters is: spraying current 100 ~ 400A, spray voltage 20 ~ 60V, compressed air pressure 0.4 ~ 1MPa, spray distance 100 ~ 300mm, spray gun translational speed 80 ~ 500mm/s, spraying pass 1 ~ 6 layer.
In described step 3, preferred arc spray process prepares anti-corrosion coating, the preferable range of its spray parameters is: spraying current 100 ~ 400A, spray voltage 20 ~ 60V, compressed air pressure 0.4 ~ 1MPa, spray distance 100 ~ 300mm, spray gun translational speed 80 ~ 500mm/s, spraying pass 1 ~ 6 layer.
In order to characterize a kind of electromagnetic cooker performance of the anti-corrosion composite coating of long-acting magnetic conduction in the present invention, utilizing SEM (SEM), salt spray test characterizes obtained coating sample, is below concrete performance test methods.
Microstructure is observed: rear polishing is inlayed in coating sample cross section, utilizes its heterogeneous microstructure of scanning electronic microscope observation.
Salt spray test: be put in by coating sample in 5%NaCl neutral salt fog environments and carry out salt spray test, investigates its decay resistance, observes sample and whether occurs the phenomenons such as crackle and coating corrosion come off.
Whether magnetic conduction heating properties is tested: 250ml deionized water at room temperature is placed in coating sample cooker, and the electromagnetic oven being placed in 2200W power carries out boiling water test, investigates test magnetic conduction heating properties, observe and room temperature water heating is boiled at the appointed time.
In sum, the present invention adopts heat spraying method to prepare the anti-corrosion composite coating of long-acting magnetic conduction, compared with cooker magnetic conduction mode conventional at present, tool has the following advantages: the magnetic conduction composite coating obtained has magnetic property and corrosion resisting property concurrently, coating deposition efficiency is high, equipment cost is low, and processing technology step is few, thus significantly reduces enterprise's production cost.Therefore, this composite coating is suitable for the application in magnetic conduction cooker field, has good market prospects.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of heat shock resistance metal based coating preparation technology of the present invention;
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, it is pointed out that the following stated embodiment is intended to be convenient to the understanding of the present invention, and any restriction effect is not play to it.
Embodiment 1:
In the present embodiment, take aluminium alloy as base material, adopt arc spraying to prepare one deck pure iron magnetic conduction coating on its surface, this coating layer thickness is 200 μm, then adopts electric arc spraying one deck ni-resist aluminized coating in the preparation of pure iron coating surface, and this coating layer thickness is 100 μm.Prepare the iron wire that raw material that pure iron coating adopts is commercially available diameter 2mm, prepare the nickel aluminium wire material that raw material that nickel aluminium coating adopts is commercially available direct 2mm.The concrete preparation method of this composite coating is as follows:
1, before spraying, alloy matrix aluminum carried out clean, adopt 60 order corundum sands to carry out surface sand-blasting pretreatment after degreasing and rust removal, make its roughness reach spraying requirement;
2, adopt arc spray process to carry out magnetic conduction coating spraying to the matrix surface after alligatoring, the spray parameters controlling arc spray gun is: spraying current 250A, spray voltage 40V, compressed air pressure 0.6MPa, spray distance 200mm, spray gun translational speed 300mm/s, spraying pass 1 layer;
3, adopt arc spray process at magnetic conduction coating surface spraying anti-corrosion coating, the spray parameters controlling arc spray gun is: spraying current 150A, spray voltage 40V, compressed air pressure 0.6MPa, spray distance 180mm, spray gun translational speed 300mm/s, spraying pass 1 layer;
Following performance test is carried out to the above-mentioned anti-corrosion composite coating of long-acting magnetic conduction prepared:
(1) coating microscopic appearance characterizes: utilize SEM to observe its section microscopic appearance, and visible coating is fine and close, and porosity is low, coating and substrate, coating and painting Coating combination good, total coating thickness is 300 μm, and wherein magnetic layer is 200 μm, and anti-corrosion overcoat is 100 μm.
(2) coating magnetic conduction heating properties test: 250ml deionized water at room temperature is placed in coating sample cooker, and the electromagnetic oven being placed in 2200W power carries out boiling water test.Result of the test shows, composite coating magnetic conduction heating properties is excellent, and the heating of 250ml deionized water just can be boiled by about 48s.
(3) corrosion resistance coating can be tested: utilize neutral salt spray test to investigate corrosion resistance coating energy.Result of the test shows, composite coating coating after neutral salt spray test 500h does not find obvious corrosion, and coating flawless and corrosion such as to come off at the phenomenon.
Embodiment 2:
In the present embodiment, take aluminium alloy as base material, adopt arc spraying to prepare one deck pure iron magnetic conduction coating on its surface, this coating layer thickness is 250 μm, then adopts electric arc spraying to prepare one deck corrosion resistant aluminium coating at pure iron coating surface, and this coating layer thickness is 100 μm.Prepare the iron wire that raw material that pure iron coating adopts is commercially available diameter 2mm, prepare the aluminium wire material that raw material that aluminized coating adopts is commercially available direct 2mm.The concrete preparation method of this composite coating is as follows:
1, before spraying, alloy matrix aluminum carried out clean, adopt 60 order corundum sands to carry out surface sand-blasting pretreatment after degreasing and rust removal, make its roughness reach spraying requirement;
2, adopt arc spray process to carry out magnetic conduction coating spraying to the matrix surface after alligatoring, the spray parameters controlling arc spray gun is: spraying current 250A, spray voltage 40V, compressed air pressure 0.6MPa, spray distance 200mm, spray gun translational speed 100mm/s, spraying pass 3 layers;
3, adopt arc spray process at magnetic conduction coating surface spraying anti-corrosion coating, the spray parameters controlling arc spray gun is: spraying current 150A, spray voltage 30V, compressed air pressure 0.5MPa, spray distance 200mm, spray gun translational speed 200mm/s, spraying pass 2 layers;
Following performance test is carried out to the above-mentioned anti-corrosion composite coating of long-acting magnetic conduction prepared:
(1) coating microscopic appearance characterizes: utilize SEM to observe its section microscopic appearance, and result shows that coating is fine and close, and porosity is low, coating and substrate, coating and painting Coating combination good, total coating thickness is 350 μm, and wherein magnetic layer is 250 μm, and anti-corrosion overcoat is 100 μm.
(2) coating magnetic conduction heating properties test: 250ml deionized water at room temperature is placed in coating sample cooker, and the electromagnetic oven being placed in 2200W power carries out boiling water test.Result of the test shows, composite coating magnetic conduction heating properties is excellent, and the heating of 250ml deionized water just can be boiled by about 40s.
(3) corrosion resistance coating can be tested: utilize neutral salt spray test to investigate corrosion resistance coating energy.Result of the test shows, composite coating coating after neutral salt spray test 500h does not find obvious corrosion, and coating flawless and corrosion such as to come off at the phenomenon.
Embodiment 3:
In the present embodiment, take aluminium alloy as base material, adopt HVAF legal system for one deck magnetic stainless steel 430 magnetic conduction coating on its surface, this coating layer thickness is 300 μm, adopt electric arc spraying to prepare the anti-corrosion Aluminum Coating of one deck at pure iron coating surface again, this coating layer thickness is 100 μm.To prepare raw material that permalloy coating adopts be commercially available granularity is the permalloy powder of 45 μm, prepares the zinc-aluminium silk material that raw material that aluminized coating adopts is commercially available direct 2mm.The concrete preparation method of this composite coating is as follows:
1, before spraying, alloy matrix aluminum carried out clean, adopt 60 order corundum sands to carry out surface sand-blasting pretreatment after degreasing and rust removal, make its roughness reach spraying requirement;
2, adopt supersonic flame spraying method to carry out magnetic conduction coating spraying to the matrix surface after alligatoring, the spray parameters controlling HVAF rifle is: combustion-supporting gas is O
2, combustion gas is propane, compressed-air actuated pressure is respectively 10bar, 6bar, 7bar, flow is respectively 240slpm, 80slpm, 380slpm, and powder speed is 50g/min, spray distance is 250mm, spray distance 300mm, spray gun translational speed 300mm/s, spraying pass 6 layers;
3, adopt arc spray process at magnetic conduction coating surface spraying anti-corrosion coating, the spray parameters controlling arc spray gun is: spraying current 200A, spray voltage 38V, compressed air pressure 0.5MPa, spray distance 250mm, spray gun translational speed 200mm/s, spraying pass 2 layers;
Following performance test is carried out to the above-mentioned anti-corrosion composite coating of long-acting magnetic conduction prepared:
(1) coating microscopic appearance characterizes: utilize SEM to observe its section microscopic appearance, and result shows that coating is fine and close, and porosity is low, coating and substrate, coating and painting Coating combination good, total coating thickness is 400 μm, and wherein magnetic layer is 300 μm, and anti-corrosion overcoat is 100 μm.
(2) coating magnetic conduction heating properties test: 250ml deionized water at room temperature is placed in coating sample cooker, and the electromagnetic oven being placed in 2200W power carries out boiling water test.Result of the test shows, composite coating magnetic conduction heating properties is excellent, and the heating of 250ml deionized water just can be boiled by about 54s.
(3) corrosion resistance coating can be tested: utilize neutral salt spray test to investigate corrosion resistance coating energy.Result of the test shows, composite coating coating after neutral salt spray test 500h does not find obvious corrosion, and coating flawless and corrosion such as to come off at the phenomenon.
Embodiment 4:
In the present embodiment, take aluminium alloy as base material, adopt arc spraying to prepare one deck iron zinc magnetic conduction coating on its surface, this coating layer thickness is 200 μm, then adopts flame-spraying to prepare one deck ni-resist 60 coating on iron spelter coating surface, and this coating layer thickness is 200 μm.To prepare raw material that iron spelter coating adopts be commercially available diameter is the silk material of 2mm, to prepare raw material that nickel 60 coating adopts be commercially available particle diameter be 38 ~ 48 Ni60 powder.The concrete preparation method of this composite coating is as follows:
1, before spraying, alloy matrix aluminum carried out clean, adopt 60 order corundum sands to carry out surface sand-blasting pretreatment after degreasing and rust removal, make its roughness reach spraying requirement;
2, adopt arc spray process to carry out magnetic conduction coating spraying to the matrix surface after alligatoring, the spray parameters controlling arc spray gun is: spraying current 250A, spray voltage 40V, compressed air pressure 0.4MPa, spray distance 150mm, spray gun translational speed 80mm/s, spraying pass 2 layers;
3, adopt flame spraying method at magnetic conduction coating surface spraying anti-corrosion coating, the spray parameters controlling flame spraying gun is: combustion-supporting gas is O
2, combustion gas is C
2h
2, assisted gas is that compressed-air actuated pressure is respectively 0.4Mpa, 0.1Mpa and 0.4Mpa, flow is respectively 2.0Nm
3/ h, 1.5Nm
3/ h and 2.0Nm
3/ h, powder feeding rate 60g/min, spray distance 200mm, spray gun translational speed 150mm/s, spraying pass 3 layers;
Following performance test is carried out to the above-mentioned anti-corrosion composite coating of long-acting magnetic conduction prepared:
(1) coating microscopic appearance characterizes: utilize SEM to observe its section microscopic appearance, and result shows that coating is fine and close, and porosity is low, coating and substrate, coating and painting Coating combination good, total coating thickness is 400 μm, and wherein magnetic layer is 200 μm, and anti-corrosion overcoat is 200 μm.
(2) coating magnetic conduction heating properties test: 250ml deionized water at room temperature is placed in coating sample cooker, and the electromagnetic oven being placed in 2200W power carries out boiling water test.Result of the test shows, composite coating magnetic conduction heating properties is excellent, and the heating of 250ml deionized water just can be boiled by about 46s.
(3) corrosion resistance coating can be tested: utilize neutral salt spray test to investigate corrosion resistance coating energy.Result of the test shows, composite coating coating after neutral salt spray test 500h does not find obvious corrosion, and coating flawless and corrosion such as to come off at the phenomenon.
Embodiment 5:
In the present embodiment, take aluminium alloy as base material, arc spraying is adopted to prepare one deck pure iron (DT1) magnetic conduction coating on its surface, this coating layer thickness is 300 μm, adopt electric arc spraying to prepare the anti-corrosion nickel chromium triangle titanium coating of one deck at pure iron (DT1) coating surface again, this coating layer thickness is 150 μm.To prepare raw material that pure iron (DT1) coating adopts be commercially available diameter is the silk material of 2mm, and to prepare raw material that nickel chromium triangle titanium coating adopts be commercially available diameter is the nickel chromium triangle titanium silk material of 2mm.The concrete preparation method of this composite coating is as follows:
1, before spraying, alloy matrix aluminum carried out clean, adopt 60 order corundum sands to carry out surface sand-blasting pretreatment after degreasing and rust removal, make its roughness reach spraying requirement;
2, adopt arc spray process to carry out magnetic conduction coating spraying to the matrix surface after alligatoring, the spray parameters controlling arc spray gun is: spraying current 250A, spray voltage 40V, compressed air pressure 0.4MPa, spray distance 150mm, spray gun translational speed 80mm/s, spraying pass 2 layers;
3, adopt arc spray process to carry out magnetic conduction coating spraying to the matrix surface after alligatoring, the spray parameters controlling arc spray gun is: spraying current 200A, spray voltage 38V, compressed air pressure 0.4MPa, spray distance 200mm, spray gun translational speed 100mm/s, spraying pass 2 layers; Following performance test is carried out to the above-mentioned anti-corrosion composite coating of long-acting magnetic conduction prepared:
(1) coating microscopic appearance characterizes: utilize SEM to observe its section microscopic appearance, and result shows that coating is fine and close, and porosity is low, coating and substrate, coating and painting Coating combination good, total coating thickness is 450 μm, and wherein magnetic layer is 300 μm, and anti-corrosion overcoat is 150 μm.
(2) coating magnetic conduction heating properties test: 250ml deionized water at room temperature is placed in coating sample cooker, and the electromagnetic oven being placed in 2200W power carries out boiling water test.Result of the test shows, composite coating magnetic conduction heating properties is excellent, and the heating of 250ml deionized water just can be boiled by about 44s.
(3) corrosion resistance coating can be tested: utilize neutral salt spray test to investigate corrosion resistance coating energy.Result of the test shows, composite coating coating after neutral salt spray test 500h does not find obvious corrosion, and coating flawless and corrosion such as to come off at the phenomenon.
Claims (8)
1. electromagnetic cooker anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof, its preparation method utilizes plasma spray technology to prepare metal magnetic conducting coating and anti-corrosion protective coating at the non-magnetic metal base surface after alligatoring, the coating layer thickness of preparation is 200 ~ 400 μm, coating possesses even compact, porosity is low, coating and substrate bond strength good, the feature such as thermal shock resistance, excellent anti-corrosion performance.This compound is applicable to domestic electromagnetic pot cooker industry, significantly can reduce current electromagnetic cooker cooker industry production cost, extend electromagnetic cooker service life, have a good application prospect and economic benefit.
2. a kind of electromagnetic cooker according to claim 1 anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof, it is characterized in that: described composite coating material comprises metal magnetic conducting coating and anti-corrosion protective coating, wherein metal magnetic conducting coating material comprises ingot iron, pure iron (DT1), pure iron (DT2), pure iron (DT3), silicon steel, permalloy, magnetic stainless steel 430, iron-zinc alloy.Anti-corrosion barrier material comprises nickel aluminium, aluminium, zinc, alumin(i)um zinc alloy, copper, titanium, nickel chromium triangle titanium, nickel 60 and other nickel-base alloys.
3. a kind of electromagnetic cooker anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof according to claim 1, is characterized in that: the non-magnetic metallic substrates of described matrix comprises Aluminum-aluminum alloy material.
4. the anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof of a kind of electromagnetic cooker according to claim arbitrary in claims 1 to 3, is characterized in that: described heat spraying method comprises electric arc spraying, HVAF, flame-spraying and cold spraying.
5. the anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof of a kind of electromagnetic cooker according to claim arbitrary in claims 1 to 3, is characterized in that comprising the steps:
Step 1: matrix is carried out clean, degreasing and rust removal and surface coarsening;
Step 2: adopt heat spraying method to prepare layer of metal magnetic conduction coating at the matrix surface processed through step 1;
Step 3: adopt heat spraying method to prepare the anti-corrosion protective coating of one deck at the matrix surface processed through step 2.
6. a kind of electromagnetic cooker according to claim 5 anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof, it is characterized in that: in described step 1, method for coarsening surface comprises sandblasting, cutting thread, annular knurl or electric plucking etc.
7. a kind of electromagnetic cooker according to claim 5 anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof, it is characterized in that: in described step 2, arc spray process is adopted to prepare magnetic conduction coating, its spray parameters is: spraying current 100 ~ 400A, spray voltage 20 ~ 60V, compressed air pressure 0.4 ~ 1MPa, spray distance 100 ~ 300mm, spray gun translational speed 80 ~ 500mm/s, spraying pass 1 ~ 6 layer; Adopt HVAF to prepare magnetic conduction coating, its spray parameters is: combustion-supporting gas is O
2, combustion gas is propane, assisted gas is compressed air, pressure is respectively 8 ~ 10bar, 5 ~ 8bar and 4 ~ 8bar, flow is respectively 210 ~ 300slpm, 50 ~ 90slpm and 300 ~ 500slpm, powder feeding gas pressure is 5 ~ 9bar, flow is 15 ~ 20slpm, and powder feeding rate is 50 ~ 150g/min, and spray distance is 250 ~ 350mm, spray gun translational speed 200 ~ 500mm/s, spraying pass 1 ~ 5 layer; Adopt flame-spraying to prepare magnetic conduction coating, its spray parameters is: combustion-supporting gas is O
2, combustion gas is C
2h
2, assisted gas is that compressed-air actuated pressure is respectively 0.3 ~ 0.7Mpa, 0.1 ~ 0.3Mpa and 0.3 ~ 0.7Mpa, flow is respectively 1.8 ~ 3.5Nm
3/ h, 1.0 ~ 2.0Nm
3/ h and 1.8 ~ 3.5Nm
3/ h, powder feeding rate 50 ~ 150g/min, 180 ~ 300mm, spray gun translational speed 200 ~ 500mm/s, spraying pass 1 ~ 5 layer.
8. a kind of electromagnetic cooker according to claim 7 anti-corrosion composite coating of long-acting magnetic conduction and preparation method thereof, it is characterized in that: in described step 3, arc spray process is adopted to prepare anti-corrosion coating, its spray parameters is: spraying current 100 ~ 400A, spray voltage 20 ~ 60V, compressed air pressure 0.4 ~ 1MPa, spray distance 100 ~ 300mm, spray gun translational speed 80 ~ 500mm/s, spraying pass 1 ~ 6 layer; Adopt flame-spraying to prepare magnetic conduction coating, its spray parameters is: combustion-supporting gas is O
2, combustion gas is C
2h
2, assisted gas is that compressed-air actuated pressure is respectively 0.3 ~ 0.7Mpa, 0.1 ~ 0.3Mpa and 0.3 ~ 0.7Mpa, flow is respectively 1.8 ~ 3.5Nm
3/ h, 1.0 ~ 2.0Nm
3/ h and 1.8 ~ 3.5Nm
3/ h, powder feeding rate 50 ~ 150g/min, 180 ~ 300mm, spray gun translational speed 200 ~ 500mm/s, spraying pass 1 ~ 5 layer.
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