CN106591761B - Method for preparing composite coating resisting molten metal erosion - Google Patents
Method for preparing composite coating resisting molten metal erosion Download PDFInfo
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- CN106591761B CN106591761B CN201510658604.XA CN201510658604A CN106591761B CN 106591761 B CN106591761 B CN 106591761B CN 201510658604 A CN201510658604 A CN 201510658604A CN 106591761 B CN106591761 B CN 106591761B
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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
- C23C4/08—Metallic material containing only metal elements
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Abstract
The invention discloses a preparation method of a molten metal erosion resistant composite coating, which comprises the following steps of firstly, preprocessing the surface of a workpiece substrate; and then, spraying metal Mo powder on the surface of a workpiece substrate to form a priming layer, spraying CoMoCr alloy powder to form a middle bonding protective layer, and spraying potassium titanate whisker powder to form a working coating in sequence by adopting a plasma spraying mode. The composite coating prepared by the method has a compact structure, is well combined, has high erosion resistance and wear resistance, has low infiltration characteristic with zinc liquid, reduces the phenomenon that aluminum and zinc are adhered to the surface of a workpiece, effectively prolongs the service life of the workpiece, and improves the production quality of the hot-dip plated plate.
Description
Technical Field
The invention relates to the technical field of preparation of material thermal spraying coatings, in particular to a preparation method of a molten metal erosion resistant composite coating.
Background
The hot-dip plated sheet has good corrosion resistance and good processing formability, weldability and paintability, and is now widely replacing other cold-rolled coated sheets to be applied to industries such as automobiles, buildings, household appliances and the like. The sink roll is a key device for hot-dip unit production, the technical performance of the sink roll is a main factor influencing the appearance quality and the yield of hot-dip products, the sink roll is soaked in molten metal during working, the working environment is extremely severe, the sink roll is corroded by high-temperature liquid metal Zn and Al and is also subjected to the abrasion and the tensile force of strip steel, and generally, an iron-based material reacts with a plating solution to generate Fe2Al5The intermetallic compounds are adhered to the surface of the equipment or exist in the plating solution in the form of zinc dross, and after the reaction products are adhered to the surface of the submerged roller, when the strip steel passes through the submerged roller in a zinc pot, the zinc dross accumulated on the roller surface is pressed into the strip steel coating and transferred to the surface of the strip steel, so that defects or scratches are formed on the surface of the strip steel, and the appearance quality of a hot-dip plated sheet product is greatly influenced.
The surfaces of a sink roller and a stabilizing roller in a hot-dip coating unit are usually sprayed with WC-Co coatings, and the coatings usually have a certain zinc adhesion phenomenon, so that the continuous service life is usually not more than two weeks, and surface zinc removal and roller surface grinding are required to ensure that the coatings reach the operating state again. Meanwhile, various novel high-aluminum-content coatings are continuously emerged due to the development requirement of modern industry, the working temperature of molten liquid exceeds 500 ℃, and a WC-Co coating cannot meet the new use requirement. The coating prepared by using the boride ceramic material with better erosion resistance is brittle, has larger difference with a stainless steel matrix in thermal expansion coefficient, and is easy to cause the coating of the sink roller to peel off in the use process with large temperature change. Therefore, higher requirements are placed on the surface coating performance of workpieces such as sink rolls and stabilizing rolls.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a molten metal corrosion resistant composite coating, and the composite coating prepared by the method has the advantages of compact structure, good combination, higher corrosion resistance and wear resistance, lower infiltration characteristic with zinc liquid, reduction of aluminum and zinc adhesion on the surface of a workpiece, effective improvement of the service life of the workpiece and improvement of the production quality of a hot-dip plated plate.
In order to solve the technical problems, the preparation method of the composite coating resistant to molten metal erosion comprises the following steps:
firstly, performing oil removal, dehumidification and sand blasting texturing pretreatment on the surface of a workpiece matrix;
secondly, spraying metal Mo powder on the surface of the workpiece substrate in a plasma spraying mode to form a bottom layer;
thirdly, spraying CoMoCr alloy powder on the surface of the priming coat by adopting a plasma spraying mode to form an intermediate combined protective layer;
and fourthly, spraying potassium titanate whisker powder on the surface of the middle combined protective layer in a plasma spraying mode to form a working coating.
And further, a transition layer formed by mixing CoMoCr alloy powder and potassium titanate whisker powder is sprayed between the middle bonding protective layer and the working coating in a plasma spraying mode.
Further, the content of the potassium titanate whisker in the transition layer is 25-55 wt%.
Further, the thickness of the transition layer is 0.02-0.04 mm.
Further, the thickness of the bottom layer is 0.03-0.05 mm, the thickness of the middle combination protective layer is 0.02-0.04 mm, and the thickness of the working coating is 0.06-0.09 mm.
Furthermore, the particle size range of the metal Mo powder is 15-75 μm, the particle size range of the CoMoCr alloy powder is 10-53 μm, and the particle size range of the potassium titanate whisker powder is 20-125 μm.
Further, the CoMoCr alloy powder comprises, by weight, 26-30% of Mo, 6.0-19% of Cr, and the balance of Co and impurities.
The preparation method of the composite coating resistant to molten metal erosion adopts the technical scheme, namely, the method firstly pretreats the surface of a workpiece substrate; and then, spraying metal Mo powder on the surface of a workpiece substrate to form a priming layer, spraying CoMoCr alloy powder to form a middle bonding protective layer, and spraying potassium titanate whisker powder to form a working coating in sequence by adopting a plasma spraying mode. The composite coating prepared by the method has a compact structure, is well combined, has high erosion resistance and wear resistance, has low infiltration characteristic with zinc liquid, reduces the phenomenon that aluminum and zinc are adhered to the surface of a workpiece, effectively prolongs the service life of the workpiece, and improves the production quality of the hot-dip plated plate.
Detailed Description
The preparation method of the composite coating resistant to molten metal erosion comprises the following steps:
firstly, performing oil removal, dehumidification and sand blasting texturing pretreatment on the surface of a workpiece matrix;
secondly, spraying metal Mo powder on the surface of the workpiece substrate in a plasma spraying mode to form a bottom layer;
thirdly, spraying CoMoCr alloy powder on the surface of the priming coat by adopting a plasma spraying mode to form an intermediate combined protective layer;
and fourthly, spraying potassium titanate whisker powder on the surface of the middle combined protective layer in a plasma spraying mode to form a working coating.
Preferably, a transition layer formed by mixing CoMoCr alloy powder and potassium titanate whisker powder is sprayed between the middle bonding protective layer and the working coating in a plasma spraying mode.
Preferably, the content of the potassium titanate whisker in the transition layer is 25 to 55 weight percent.
Preferably, the thickness of the transition layer is 0.02-0.04 mm.
Preferably, the thickness of the bottom layer is 0.03-0.05 mm, the thickness of the middle combination protective layer is 0.02-0.04 mm, and the thickness of the working coating is 0.06-0.09 mm.
Preferably, the particle size range of the metal Mo powder is 15-75 μm, the particle size range of the CoMoCr alloy powder is 10-53 μm, and the particle size range of the potassium titanate whisker powder is 20-125 μm.
Preferably, the CoMoCr alloy powder comprises, by weight, 26-30% of Mo, 6.0-19% of Cr, and the balance of Co and impurities.
The method is characterized in that a layer of metal Mo powder with self-bonding performance is sprayed on the surface of a workpiece after purification and coarsening treatment to improve the bonding strength of a coating and a matrix, the coating with self-bonding performance and the matrix are not only mechanically bonded but also subjected to micro-metallurgical bonding, and the basic principle is that molten drops of the Mo material carry a large amount of heat energy during spraying, the overheated molten drops and oxygen in air are subjected to oxidation reaction and emit a large amount of heat to further raise the temperature of the molten drops, and the molten drops are subjected to metallurgical bonding when colliding with the matrix to form a self-bonding layer. The self-bonding layer exists between the substrate and the working coating, and the good bonding not only improves the bonding force with the substrate, but also provides a rough surface for the working coating. Meanwhile, the Mo coating has good liquid metal corrosion resistance and lyophobic property.
The CoMoCr alloy and Mo metal have good compatibility and bonding performance, cobalt is a good bonding phase, the addition of chromium can strengthen the bonding phase and improve the oxidation resistance of the coating, meanwhile, intermetallic compounds of Levis phase can be formed in the CoMoCr coating, the hardness is high, the corrosion resistance of liquid metal, the wear resistance and the high-temperature oxidation resistance can reach 800 ℃, the intermediate bonding protective layer can also effectively prevent the permeation oxidation damage of high-temperature air with the temperature of more than 400 ℃ to the Mo bottom layer in the preheating process of the sinking roller coating before use, and the good bonding of the composite coating and the matrix is ensured.
The molecular formula of the potassium titanate of the working coating is K2O nTiO2, when n =6, the potassium titanate is potassium hexatitanate, the crystal structure is in a tunnel type, potassium ions are coated in the middle of the tunnel to isolate peripheral atoms, and therefore the potassium titanate has high chemical stability and high mechanical strength. The formed whisker is a novel needle-shaped short fiber, is a high-performance composite material reinforcing agent, has good mechanical property and physical property, also has very high heat resistance (1200 ℃) and good erosion resistance and abrasion resistance, is not mutually compatible and wet with liquid ZnAl, and has anti-bonding property. Meanwhile, the microstructure formed by the coating is in a fibrous structure, which is beneficial to improving the toughness and the thermal shock resistance of the coating.
The plasma spraying mode is that high temperature plasma jet produced by non-transfer electric arc is used to heat and accelerate the spraying material, so that the spraying material reaches high temperature and high speed state and is sprayed from the gun tube at high speed to deposit on the substrate to form the coating. The plasma jet has the characteristics of high energy density, high temperature and high speed, so that the spraying material has a wide range and can deposit all materials with physical melting points. The plasma spraying coating has the advantages of fine structure, low oxide content and porosity, and high bonding strength between the coating and a matrix and between coating particles.
Example 1:
carrying out oil removal, dehumidification and sand blasting texturing pretreatment on the surface of a base material of a roller body to be sprayed, and spraying metal Mo powder on a matrix by adopting a plasma spraying mode to form a bottom layer with the thickness of 0.05 mm; spraying CoMoCr alloy powder on the surface of the priming coat by adopting a plasma spraying mode to form a middle combined protective layer with the thickness of 0.02 mm; spraying a transition layer which is formed by mixing CoMoCr and potassium titanate whiskers and has the thickness of 0.04mm on the middle bonding protective layer, wherein the content of the potassium titanate whiskers in the transition layer is 35%; and spraying potassium titanate whisker powder on the middle combined protective layer and the transition layer surface in the same spraying way to form a surface working coating with the thickness of 0.08 mm.
Example 2:
carrying out oil removal, dehumidification and sand blasting texturing pretreatment on the surface of a base material of a roller body to be sprayed, and spraying metal Mo powder on a matrix by adopting a plasma spraying mode to form a bottom layer with the thickness of 0.03 mm; spraying CoMoCr alloy powder on the surface of the priming coat by adopting a plasma spraying mode to form a middle combined protective layer with the thickness of 0.03 mm; and spraying potassium titanate whisker powder on the surface of the middle bonding protective layer in the same spraying way to form a surface working coating with the thickness of 0.09 mm.
Example 3:
carrying out oil removal, dehumidification and sand blasting texturing pretreatment on the surface of a base material of a roller body to be sprayed, and spraying CoMoCr alloy powder on a matrix by adopting a plasma spraying mode to form a bottoming and middle combined protective layer with the thickness of 0.04 mm; spraying a transition layer which is formed by mixing CoMoCr and potassium titanate whiskers and has the thickness of 0.03mm on the middle bonding protective layer, wherein the content of the potassium titanate whiskers in the transition layer is 25%; and spraying potassium titanate whisker powder on the surface of the transition layer in the same spraying way to form a surface working coating with the thickness of 0.07 mm.
The method has the characteristics that:
the Mo coating has self-bonding performance with a stainless steel substrate, so that the bonding force with the substrate is improved, a rough surface is provided for a bonding layer, and meanwhile, the Mo coating has good liquid metal corrosion resistance and lyophobicity;
the CoMoCr alloy and Mo metal have good compatibility and bonding performance, the intermetallic compound performance of the Levis phase in the coating is excellent, the layer can also effectively prevent the high-temperature oxidation of Mo in the priming layer, and meanwhile, the layer can also be directly used as the priming layer;
3. the introduction of the potassium titanate whisker ceramic material improves the corrosion resistance and wear resistance of the coating, and simultaneously, the fibrous structure of the coating is beneficial to improving the toughness and thermal shock resistance of the ceramic phase;
4. the plasma spraying material has wide range, the coating has fine structure and low oxide content and porosity, thereby ensuring the integral service performance of the composite coating and the simple and easy preparation of the coating.
The composite coating with the resistance to molten metal erosion prepared by the method has the advantages of high strength, good toughness, strong high temperature resistance and thermal shock resistance, excellent wear resistance and molten aluminum-zinc liquid corrosion resistance, relatively approximate thermal expansion coefficient of the coating and a stainless steel matrix through metal ceramic composite transition, difficult peeling of the coating, and greatly enhanced service performance compared with the traditional coating.
Claims (7)
1. A preparation method of a composite coating resistant to molten metal erosion is characterized by comprising the following steps:
firstly, performing oil removal, dehumidification and sand blasting texturing pretreatment on the surface of a workpiece matrix of a sink roller or a stabilizing roller;
secondly, spraying metal Mo powder on the surface of the workpiece substrate of the sink roll or the stabilizing roll in a plasma spraying mode to form a bottom layer;
thirdly, spraying CoMoCr alloy powder on the surface of the priming coat by adopting a plasma spraying mode to form an intermediate combined protective layer;
and fourthly, spraying potassium titanate whisker powder on the surface of the middle combined protective layer in a plasma spraying mode to form a working coating.
2. The method of making a molten metal etch resistant composite coating of claim 1, wherein: and spraying a transition layer formed by mixing CoMoCr alloy powder and potassium titanate whisker powder between the middle combined protective layer and the working coating in a plasma spraying mode.
3. The method of making a molten metal etch resistant composite coating of claim 2, wherein: the content of the potassium titanate whisker in the transition layer is 25-55 wt%.
4. The method of making a molten metal etch resistant composite coating as recited in claim 2 or 3, wherein: the thickness of the transition layer is 0.02-0.04 mm.
5. The method of making a molten metal etch resistant composite coating of claim 1, wherein: the thickness of the bottoming layer is 0.03-0.05 mm, the thickness of the middle combination protective layer is 0.02-0.04 mm, and the thickness of the working coating is 0.06-0.09 mm.
6. The method of making a molten metal etch resistant composite coating of claim 1, wherein: the particle size range of the metal Mo powder is 15-75 mu m, the particle size range of the CoMoCr alloy powder is 10-53 mu m, and the particle size range of the potassium titanate whisker powder is 20-125 mu m.
7. The method of producing a molten metal etch resistant composite coating as claimed in claim 1 or 2, wherein: the CoMoCr alloy powder comprises, by weight, 26-30% of Mo, 6.0-19% of Cr and the balance of Co and impurities.
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| CN107904536B (en) * | 2017-11-14 | 2020-01-07 | 北京矿冶研究总院 | Sealant-free molten zinc-aluminum corrosion resistant coating material and preparation method thereof |
| CN111424229B (en) * | 2018-12-20 | 2022-12-27 | 上海宝钢工业技术服务有限公司 | Preparation method of composite coating resistant to liquid metal alloy etching |
| CN112575210A (en) * | 2020-11-27 | 2021-03-30 | 李江巡 | Preparation process of high-strength corrosion-resistant aluminum alloy |
| CN114686796B (en) * | 2020-12-31 | 2024-02-13 | 安泰天龙钨钼科技有限公司 | Wear-resistant corrosion-resistant coating material, coating and preparation method thereof |
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Address after: 3520 Tongji Road, Baoshan District, Shanghai 201900 Patentee after: Baowu equipment Intelligent Technology Co.,Ltd. Address before: 201900, 335, Pu Pu Road, Shanghai, Baoshan District Patentee before: SHANGHAI BAOSTEEL INDUSTRY TECHNOLOGICAL SERVICE Co.,Ltd. |