CN101724806A - Method for manufacturing hot roller plate with anti-corrosive metal coating formed by continuous thermal spraying - Google Patents
Method for manufacturing hot roller plate with anti-corrosive metal coating formed by continuous thermal spraying Download PDFInfo
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- CN101724806A CN101724806A CN200810201493A CN200810201493A CN101724806A CN 101724806 A CN101724806 A CN 101724806A CN 200810201493 A CN200810201493 A CN 200810201493A CN 200810201493 A CN200810201493 A CN 200810201493A CN 101724806 A CN101724806 A CN 101724806A
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Abstract
The invention provides a method for manufacturing a hot rolled plate with an anti-corrosive metal coating, which adopts the steps of performing sand blasting treatment and thermal spraying treatment on the surface of a steel plate in a hot rolling production line of the steel plate. The thermal spraying treatment adopts a high-speed gas arc thermal spraying method which takes metal or an alloy wire as a spraying raw material. After the thermal spraying, pressurizing and straightening treatment as well as subsequent thermal treatment can be performed on the steel plate. Due to the adoption of the high-speed gas arc on-line spraying, the method has the characteristics of high efficiency, low cost, energy conservation, improved automation degree, and capacity of realizing continuous production.
Description
Technical field
The invention belongs to the material surface technical field, be specifically related to anti-corrosive metal coating and handle, relate more specifically to the method for surface of steel plate thermospray corrosion protection coating.
Background technology
Corrosion be steel structural part the most common also be one of the most serious damage failure mode.Some large-scale steel structural parts as bridge, boats and ships, oil tank, sluice etc., need carry out rotproofing to prolong its work-ing life and to improve safety performance to its surface usually.Method for anticorrosion treatment commonly used has two kinds: japanning method and hot spray process.The japanning method protection cycle only is 1～3 year, can only be as the short-term safeguard procedures.Utilize the galvanic protection function of zinc, aluminium, the thermospray zinc-aluminium can provide permanently effective protection for steel structural part.But the general volume of steel structural part is very huge, and execution conditions are very arduous out of doors, and workload is big, is difficult for realizing automatization, and is subjected to the restriction of factor affecting such as weather easily.If can produce hot-rolled sheet product in batches in steel mill with anti-corrosive metal coating, just can improve execution conditions, realize automatic production, improve the quality of products, and remove or significantly reduce follow-up steel part maintenance and protected working from, this will save great amount of manpower and material resources.
Japanese documentation 2006233310 announced a kind of on the slab line of laboratory the method for supersonic spray coating corrosion protection coating, its coating is materials such as nickel-base alloy and stainless steel.But supersonic spray coating is unwell to the low-melting zinc of spraying, aluminum; And supersonic spray coating production efficiency is lower, cost is higher, is unwell to production in enormous quantities.The open communique 101063203 of Chinese patent has been announced a kind of method that is equipped with coated metal with the cold spraying legal system.The cold spraying method is a kind of new spraying coating process, and the technology of itself is still immature, and coating quality is difficult to control.This method can only spray low-melting alloy coat, and has the problem that production efficiency is low, equipment cost is high equally.
Summary of the invention
Hot spray process is difficult for the shortcoming that macrostructure spare is handled in automatization at the japanning method protection cycle is short, the purpose of this invention is to provide the method that a kind of continuous batch is produced hot roller plate with anti-corrosive metal coating formed.
Method for manufacturing hot roller plate with anti-corrosive metal coating formed provided by the invention is to add surface of steel plate is carried out sandblasting and thermal spraying treatment step in the hot-rolled steel plate production line.
Sandblasting among the present invention and thermal spraying treatment on the hot rolling finishing line of described hot rolling line or the cooling section of plate production line carry out.Plate slab reaches desired size after hot rolling, utilize the surplus temperature after the hot rolling, selects steel plate to be cooled to 300～600 ℃ temperature section at surface of steel plate metallize corrosion protection coating, can make full use of heat energy.Steel matrix has certain temperature, and after the particle of coated material arrived steel plate, performance was more active, helps the abundant diffusion between coated material and steel plate, forms firm combination.Make coating and steel plate form good binding.Carry out on hot rolling line, produce the hot-rolled sheet with anti-corrosive metal coating, its process flow sheet is seen figure one; Cooling section at plate production line carries out, and produces the anti-corrosive metal coating slab, and its process flow sheet is seen figure two.
Before the thermospray surface of steel plate is carried out sandblasting, can remove the oxide skin of surface of steel plate on the one hand, obtain clean Surface, can make the surface of steel plate texturing on the other hand, help combining closely of coated material and steel matrix.The abrasive material that sandblasting is adopted is brown diamond spar, quartz sand or diamond spar sand.Sandblasting makes steel surface reach 2.5 grades of Sa.
It is the high-speed fuel gas electric arc thermal spray processes of spraying raw material that thermal spraying treatment can adopt with metal or alloy silk material.
The high-speed fuel gas arc spraying is a kind of novel arc spray process, combines the advantage of arc spraying and hypersonic flame spraying method.High-speed fuel gas electric arc spraying ratio juris is that supersaturation reactive gas and pressurized air are lighted formation high speed flame stream through electric sparking plug after the combustion chamber is mixed in proportion.The silk material fusing of burning simultaneously and will evenly send in the electric arc of silk material end, tiny through the silk material atomizing that flame stream will melt, as to be evenly distributed particle for granularity, spray to matrix surface at a high speed and form coating, its speed can reach 800m/s, far above common electric arc spraying, therefore can form fine and close coating uniformly.High-speed fuel gas arc spraying spray efficiency reaches 15kg/h, in preparation high-quality coating, can reach higher production efficiency, satisfies the quantity-produced needs.Its production cost is the cheapest in the heat spraying method simultaneously.
The metal or alloy silk material that adopts in the inventive method is selected from zinc and alloy, aluminium and alloy thereof, magnesium and alloy thereof.
The high-speed fuel gas electric arc thermal spray processes that adopts in the inventive method is a working gas with 0.6～1.2Mpa pressurized air, is combustion gases with 0.6～1.2Mpa propane or propylene, and operating voltage is 15～40V, and working current is 100～300A.
The high-speed fuel gas electric arc thermal spray processes that adopts in the inventive method is being arranged one or many high-speed fuel gas arc pistol along the steel plate working direction, spray gun sprays along transverse movement, can spray in the one side of steel plate, also can spray on two surfaces up and down.
In the inventive method, steel plate can enter the straightener straightening processing of pressurizeing after thermal spraying treatment.Straightener applies stress to steel plate, can remove the camber of sheet distortion on the one hand, grinds by pressing on the other hand, makes coating more firm with combining of steel plate.
After straightening processing, can carry out 200～500 ℃ of thermal treatments, coating fully is diffused in the matrix, also can directly use in conjunction with effect obtaining better without thermal treatment to steel plate.
The present invention has the following advantages and effect:
1. can on hot rolling line or plate production line, carry out on-line spray, production efficiency height.Can improve level of automation.The present invention is fit to the spraying of hot-rolled sheet and slab, can fill up the blank of present hot-rolled sheet and thick metal coating prod.
2. the high-speed fuel gas arc spraying can prepare fine and close coating uniformly, and has high-level efficiency, characteristics cheaply, and suitable mass industrialized production metallic coating can be realized automatization.
3. the diversity for the coating steel product provides possibility.Because the material category that the high-speed fuel gas arc spraying can spray is very abundant.This method not only can spray zinc and alloy thereof, aluminium and alloy thereof, and magnesium and alloy thereof can also spray any metal and alloy wire, can also spray powder core wire, as the ceramic powder of metal parcel, organic dust etc.For the manufacturing of functional coating provides various possibilities.
The simple declaration of accompanying drawing
Fig. 1 is a hot rolling line continuous thermal spraying process flow sheet.
Fig. 2 is a plate production line continuous thermal spraying process flow sheet.
Fig. 3 is the SEM of the cross section tissue figure of embodiment 1 coating.
Embodiment
Embodiment 1
The hot-rolled steel sheet sample heats half an hour at 400 ℃.Steel plate is carried out sandblasting, is abrasive material with the brown corundum of granularity 20#～100#, and scale removal obtains the surface of cleaning texturing.With high-speed fuel gas electrical arc spraying method for preparing Zn-15Al coating.Spraying coating process is spray voltage 25V, spraying current 130A, horizontal throw 150mm, combustion gases propane pressure 0.65Mpa, compressed air pressure 0.65Mpa.Coating thickness 100 μ m.The spraying back applies stress with straightener.Coating and matrix bond are firm.
Embodiment 2
The hot-rolled steel sheet sample heats half an hour at 550 ℃.Steel plate is carried out sandblasting, is abrasive material with the brown corundum of granularity 20#～100#, and scale removal obtains the surface of cleaning texturing.With high-speed fuel gas electrical arc spraying method for preparing Al coating.Spraying coating process is spray voltage 30V, spraying current 150A, horizontal throw 145mm, combustion gases propane pressure 0.75Mpa, compressed air pressure 0.7Mpa.Coating thickness 150 μ m.The spraying back applies stress with straightener.Be heated to 500 ℃ at process furnace then, anneal 1 hour.Coating and matrix bond are firm.
Embodiment 3
The hot-rolled steel sheet sample heats half an hour at 500 ℃.Steel plate is carried out sandblasting, and the brown corundum that with the granularity is 20#～100# is an abrasive material, and scale removal obtains the surface of cleaning texturing.Prepare the Mg coating with the high-speed fuel gas arc spraying.Spraying coating process is spray voltage 28V, spraying current 150A, horizontal throw 145mm, combustion gases propane pressure 0.73Mpa, compressed air pressure 0.7Mpa.Coating thickness 100 μ m.The spraying back applies stress with straightener.Coating and matrix bond are firm.
Claims (10)
1. the manufacture method of hot roller plate with anti-corrosive metal coating formed is characterized in that: add in the hot-rolled steel plate production line surface of steel plate is carried out sandblasting and thermal spraying treatment step.
2. manufacture method as claimed in claim 1, wherein said sandblasting and thermal spraying treatment on the hot rolling finishing line of described hot rolling line or the cooling section of plate production line carry out.
3. manufacture method as claimed in claim 2, the temperature of the cooling section light plate of wherein said hot rolling finishing line or plate production line is 300～600 ℃.
4. manufacture method as claimed in claim 1, the abrasive material that wherein said sandblasting is adopted is brown diamond spar, quartz sand or diamond spar sand.
5. manufacture method as claimed in claim 1, it is the high-speed fuel gas electric arc thermal spray processes of spraying raw material that wherein said thermal spraying treatment adopts with metal or alloy silk material.
6. manufacture method as claimed in claim 5, wherein said metal or alloy silk material is selected from zinc and alloy, aluminium and alloy thereof, magnesium and alloy thereof.
7. manufacture method as claimed in claim 5, wherein said high-speed fuel gas electric arc thermal spray processes adopts 0.6～1.2Mpa pressurized air as working gas, adopt 0.6～1.2Mpa propane or propylene as combustion gases, operating voltage is 15～40V, and working current is 100～300A.
8. manufacture method as claimed in claim 5, wherein said high-speed fuel gas electric arc thermal spray processes arrange along the steel plate working direction one or many high-speed fuel gas arc pistol, spray gun is along transverse movement, the one side of steel plate or up and down two surfaces spray.
9. manufacture method as claimed in claim 1 wherein also is included in after the thermal spraying treatment steel plate is carried out straightener pressurization straightening processing.
10. manufacture method as claimed in claim 1 is carried out 200～500 ℃ of thermal treatments to steel plate after wherein also being included in straightening processing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810201493A CN101724806A (en) | 2008-10-21 | 2008-10-21 | Method for manufacturing hot roller plate with anti-corrosive metal coating formed by continuous thermal spraying |
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| CN200810201493A CN101724806A (en) | 2008-10-21 | 2008-10-21 | Method for manufacturing hot roller plate with anti-corrosive metal coating formed by continuous thermal spraying |
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| CN101724806A true CN101724806A (en) | 2010-06-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994079A (en) * | 2010-09-27 | 2011-03-30 | 江阴东大新材料研究院 | Spraying-spinning method for preparing high-density coating on the surface of shaft part |
| CN102582153A (en) * | 2012-02-10 | 2012-07-18 | 王宝根 | Production line of supersonic flame zinc-powder blended iron composite plate |
| CN109821923A (en) * | 2019-02-26 | 2019-05-31 | 桂林理工大学 | A kind of production method of anti-corrosion coating plain bar |
| CN110343990A (en) * | 2019-07-23 | 2019-10-18 | 湖南三泰新材料股份有限公司 | A kind of on-line spray anti-corrosion covers hot rolling coating reinforcing bar of material and preparation method thereof |
| CN113293372A (en) * | 2021-05-31 | 2021-08-24 | 内蒙古联晟新能源材料有限公司 | Processing technology for secondary treatment of rolled aluminum coil surface |
| WO2022057757A1 (en) * | 2020-09-17 | 2022-03-24 | 宝山钢铁股份有限公司 | Continuous surface treatment method for hot-rolled plates/strips |
-
2008
- 2008-10-21 CN CN200810201493A patent/CN101724806A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994079A (en) * | 2010-09-27 | 2011-03-30 | 江阴东大新材料研究院 | Spraying-spinning method for preparing high-density coating on the surface of shaft part |
| CN102582153A (en) * | 2012-02-10 | 2012-07-18 | 王宝根 | Production line of supersonic flame zinc-powder blended iron composite plate |
| CN109821923A (en) * | 2019-02-26 | 2019-05-31 | 桂林理工大学 | A kind of production method of anti-corrosion coating plain bar |
| CN110343990A (en) * | 2019-07-23 | 2019-10-18 | 湖南三泰新材料股份有限公司 | A kind of on-line spray anti-corrosion covers hot rolling coating reinforcing bar of material and preparation method thereof |
| WO2022057757A1 (en) * | 2020-09-17 | 2022-03-24 | 宝山钢铁股份有限公司 | Continuous surface treatment method for hot-rolled plates/strips |
| CN113293372A (en) * | 2021-05-31 | 2021-08-24 | 内蒙古联晟新能源材料有限公司 | Processing technology for secondary treatment of rolled aluminum coil surface |
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Open date: 20100609 |