CN114210969B - Corrosion-resistant material, method for producing the same, and corrosion-resistant coating formed therefrom - Google Patents

Corrosion-resistant material, method for producing the same, and corrosion-resistant coating formed therefrom Download PDF

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CN114210969B
CN114210969B CN202111549308.8A CN202111549308A CN114210969B CN 114210969 B CN114210969 B CN 114210969B CN 202111549308 A CN202111549308 A CN 202111549308A CN 114210969 B CN114210969 B CN 114210969B
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corrosion
anticorrosive
binder
particles
powder
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CN114210969A (en
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张明
瞿义生
王业友
袁华庭
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Wuhan Supor Cookware Co Ltd
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Wuhan Supor Cookware Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/026—Spray drying of solutions or suspensions
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Food Science & Technology (AREA)
  • Powder Metallurgy (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention provides an anti-corrosion material, a preparation method thereof and an anti-corrosion coating formed by the anti-corrosion material. The corrosion-resistant material includes a plurality of corrosion-resistant particles, each of which includes a metallic material and a nonmetallic corrosion-resistant material coated on a surface of the metallic material by a binder. The anticorrosive layer formed by using the anticorrosive material of the present inventive concept has an excellent anticorrosive effect.

Description

Corrosion-resistant material, method for producing the same, and corrosion-resistant coating formed therefrom
Technical Field
The invention relates to the field of rust prevention, in particular to an anti-corrosion material, a preparation method thereof and an anti-corrosion coating formed by the anti-corrosion material.
Background
Corrosion protection techniques are used in many fields, and more devices require the provision of corrosion protection layers. The conventional anti-corrosion layer is generally composed of a transition layer and a sealing layer, wherein the transition layer mainly provides bonding force with a substrate, and the sealing layer mainly provides corrosion resistance, however, the transition layer alone cannot form good corrosion resistance, and the sealing layer alone cannot form good bonding force with the substrate, so that the two layers of the transition layer and the sealing layer must be combined to form a main frame structure of the anti-corrosion layer. However, when a multi-layered corrosion protection structure is provided, there are the following disadvantages: the efficiency is low, and because the two layers are required to be sprayed separately, the efficiency is reduced in the production process; the cost is high, on one hand, the overall qualification rate is reduced due to one more process, and on the other hand, the thickness of the two spraying layers meets the lower limit value of the spraying layers according to the requirement, so that the cost waste is caused, and the cost is high.
Disclosure of Invention
Therefore, how to prepare a single-layer anti-corrosion coating to achieve an anti-corrosion effect, so as to solve the problems of low efficiency and high cost of the production process, is a problem which the person skilled in the art always needs to solve. To this end, the present invention provides an anti-corrosion material, a method of preparing the same, and an anti-corrosion coating formed therefrom.
The anticorrosive material according to exemplary embodiments of the inventive concept may include an anticorrosive material. The corrosion-preventing material may include a plurality of corrosion-preventing particles, and each of the corrosion-preventing particles may include a metallic material and a nonmetallic corrosion-resistant material coated on a surface of the metallic material by a binder.
In an example embodiment, the weight of the metallic material is not more than 30% of the total weight of the corrosion protection particles, the weight of the binder is 0.1% to 2% of the total weight of the corrosion protection particles, and the balance is the non-metallic corrosion resistant material, based on the total weight of each corrosion protection particle.
In an exemplary embodiment, the metallic material may include at least one of titanium, a titanium alloy, stainless steel, nickel, and a nickel alloy. The nonmetallic corrosion-resistant material may include AT least one of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, iron oxide, aluminum oxide, AT series material (composite material of titanium oxide and aluminum oxide), and silicon oxide. The binder may include a cellulose-based binder.
In an exemplary embodiment, the particle size of the anti-corrosion particles may be in the range of 20 μm to 100 μm.
The present invention provides a method of preparing an anti-corrosion material, which may include the steps of: providing a metal material powder, a non-metal corrosion resistant material powder and a binder; preparing metal material powder, nonmetal corrosion resistant material powder and a binder into slurry; the slurry is subjected to spray drying treatment to obtain an anticorrosive material comprising a plurality of anticorrosive particles, wherein each anticorrosive particle comprises a metallic material and a nonmetallic anticorrosive material covered with a binder.
In an example embodiment, the weight of the metal material may not exceed 30% of the total weight of the anti-corrosion particles, the weight of the binder may be 0.1% to 2% of the total weight of the anti-corrosion particles, and the balance may be a non-metallic corrosion resistant material, based on the total weight of each anti-corrosion particle.
In an example embodiment, the metallic material may include AT least one of titanium, a titanium alloy, stainless steel, nickel, and a nickel alloy, the nonmetallic corrosion-resistant material may include AT least one of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, ferric oxide, aluminum oxide, an AT-series material, and silicon oxide, and the binder may include a cellulose-based binder.
In an exemplary embodiment, the method may further include: after the spray drying treatment, the corrosion-resistant material is sintered.
In an exemplary embodiment, the step of providing a metallic material powder, a non-metallic corrosion resistant material powder, and a binder further comprises: and grinding the metal material and the nonmetal corrosion resistant material respectively to obtain metal material powder and nonmetal corrosion resistant powder, wherein the particle size of the metal material powder is 10-50 mu m, and the particle size of the nonmetal corrosion resistant material powder is 1-10 mu m.
In an exemplary embodiment, in the step of preparing the metal material powder, the non-metal corrosion resistant material powder, and the binder into a slurry, the sum of the weight of the metal material powder and the non-metal corrosion resistant material powder in the slurry is 20% to 70% of the total weight of the slurry.
The anticorrosive coating according to exemplary embodiments of the inventive concept may be formed by spraying the above-described anticorrosive material on the surface of the base material of the cooker.
By the above brief description of the inventive concept, it is possible to provide an anti-corrosion coating layer formed on a substrate surface of a cooker using an anti-corrosion material prepared using a metallic material as a transition layer and a non-metallic material as a closing layer. The anti-corrosion coating not only has good binding force with the base material, but also has good sealing effect in the coating and good anti-corrosion effect. The anticorrosive coating prepared by the method of the inventive concept has low manufacturing cost and has small thickness and excellent anticorrosive performance due to the single-layer structure.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying examples, in which, however, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The surface of a base material such as a cooker is often easily corroded (e.g., rusted) due to electrochemical reaction due to the influence of a cooking environment or the like, and therefore, in order to prevent the base material of the cooker from being corroded, an anti-corrosion layer is provided on the surface of the base material.
The Chinese patent application with the application number of 201821887926.7 discloses an anti-rust iron pan, which comprises a base material, a transition layer positioned on the surface of the base material, a sealing layer positioned on the surface of the transition layer and an optional coloring layer formed on the surface of the sealing layer, wherein the sealing layer is a thermal spraying layer, the transition layer mainly provides binding force with the base material, the sealing layer mainly provides corrosion resistance, and the two layers of the transition layer and the sealing layer are combined to form a main body frame structure of the anti-rust layer. However, the two layers of the transition layer and the sealing layer in the technology need to be sprayed separately, so that the production efficiency is reduced, the overall qualification rate is reduced due to more than one process, and meanwhile, the cost is wasted due to the fact that the thickness of the two sprayed layers meets the lower limit value of the sprayed layers as required, so that the cost is high.
Aiming at the technical problems, the invention mainly combines the metal material used as the transition layer, the nonmetallic corrosion-resistant material used as the sealing layer and the binder to form the anti-corrosion particles, and the prepared anti-corrosion particles are sprayed on the base material to form the single-layer anti-corrosion coating, so that the technical effect that the anti-corrosion purpose can be achieved by using one layer of coating is realized, the production efficiency is improved, and the cost is reduced.
Hereinafter, the inventive concept will be described in detail in connection with exemplary embodiments.
The anticorrosive material according to exemplary embodiments of the inventive concept may include a plurality of anticorrosive particles (i.e., have a particle form), and each anticorrosive particle includes a metallic material and a nonmetallic anticorrosive material adhered to a surface of the metallic material by a binder.
According to an exemplary embodiment, the metal material may include at least one of titanium, titanium alloy, stainless steel, nickel, and nickel alloy to provide a bonding force with the substrate.
According to an exemplary embodiment, the weight of the metallic material in the corrosion protection particles may not exceed 30% of the weight of the corrosion protection particles, e.g., may preferably be 5% to 25%, more preferably may be 10% to 20%. When the proportion of the metal material in the anticorrosive particle is more than 30% by weight, an excessively large proportion of the metal material may cause the porosity of the anticorrosive particle to be excessively high, and thus may reduce the corrosion resistance of the anticorrosive material; when the proportion of the metal material in the anticorrosive particles is 0 by weight, the anticorrosive particles are composed of only the binder and the nonmetallic corrosion-resistant material, at this time, the host material is the nonmetallic corrosion-resistant material, the formed anticorrosive particles are composed of clusters of the nonmetallic corrosion-resistant material, and thus the porosity of the formed anticorrosive particles is low, but the deformation amount of the nonmetallic material during the spraying process is smaller than that of the metal material, so the binding force is also lower than that of the metal material, and thus in the present application, the amount of the metal material is more than 0%.
According to an exemplary embodiment, a non-metallic corrosion resistant material may be attached (e.g., coated) on the surface of the metallic material in particulate form for providing corrosion resistance of the corrosion resistant material.
According to an exemplary embodiment, the nonmetallic corrosion-resistant material may include AT least one of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, ferric oxide, aluminum oxide, AT-series materials (composite of titanium oxide and aluminum oxide), and silicon oxide. Here, the AT-series material is a composite material of titanium oxide and aluminum oxide, instead of a simple physical mixture of titanium oxide material and aluminum oxide material (for example, the preparation process of black titanium oxide is to obtain black titanium oxide after electrofusion electrolysis of titanium white, while the preparation process of AT-series material may be to uniformly mix aluminum oxide and titanium white simply and physically before electrofusion electrolysis, and then electrofusion electrolysis is performed), and the obtained composite material has a structure of black titanium oxide and aluminum oxide connected together. However, the concept of the present invention is not limited thereto, and those skilled in the art may select other nonmetallic corrosion-resistant materials other than the above materials according to actual needs.
The binder is used to bond the metallic material to the nonmetallic corrosion-resistant material. The binder according to an exemplary embodiment may include a cellulose-based binder. Here, the cellulose-based binder may include at least one of cellulose-based binders such as a hydroxymethyl cellulose-based binder, a hydroxyethyl cellulose-based binder, and a hydroxypropyl methyl cellulose-based binder. However, the inventive concept is not particularly limited to the kind of binder, and a person skilled in the art may select an appropriate binder according to actual needs.
According to an exemplary embodiment, the weight of the cellulosic binder in the corrosion protection particles may be 0.1 to 2% of the weight of the corrosion protection particles, e.g., preferably, may be 0.5% to 1.5%, more preferably, may be 0.8% to 1.2%. When the anticorrosive particles according to the present application are sprayed on the surface of a substrate to form a coating layer, the cellulose-based binder contained in the anticorrosive particles does not volatilize at the high temperature of the cold and hot spraying, but remains in the coating layer, fills in the pores of the coating layer, and thus reduces the porosity of the coating layer. According to the present application, on the one hand, when the weight percentage of the cellulose-based binder contained in the anticorrosive particles is less than 0.1%, the proportion of the binder is small, resulting in poor adhesion properties, and thus, the anticorrosive particles are liable to be broken; on the other hand, when the weight percentage of the cellulose-based binder contained in the anticorrosive particles is more than 1%, the porosity of the anticorrosive layer formed by such anticorrosive particles is high, resulting in a decrease in the corrosion resistance of the anticorrosive material.
According to an exemplary embodiment, the particle size (e.g., average particle size D50) of the anti-corrosion particles may be in the range of 20 μm to 100 μm, for example, preferably, may be in the range of 40 μm to 80 μm, and more preferably, may be in the range of 50 μm to 70 μm. When the particle diameter of the anticorrosive particles is more than 100 μm, on the one hand, the pores of the formed coating are large, which results in poor corrosion resistance, and on the other hand, the appearance roughness affects the appearance effect of the product, and when the particle diameter of the anticorrosive particles is less than 20 μm, clogging of the powder feeding pipe for cold and hot spraying easily occurs, which results in production inefficiency.
The corrosion-resistant material composed of the metallic material, the nonmetallic corrosion-resistant material, and the binder of the inventive concept is described in detail above in connection with the exemplary embodiments. When the anticorrosive material is formed on the surface of the substrate by a process of forming a layer (such as a cold spray process, a hot spray process), an anticorrosive layer having excellent properties can be formed, thereby improving the service life of the cooker. Therefore, according to the present application, by forming the anticorrosive material in the form of particles via the binder from the metal material that provides the binding force with the substrate and the nonmetallic material that provides the corrosion resistance, it is possible to form a layer of the anticorrosive coating from the anticorrosive material on the substrate, so that the process of forming the coating can be simplified while improving the production efficiency.
Hereinafter, a method for preparing the anticorrosive material of the inventive concept will be described in detail with reference to exemplary embodiments.
The method of preparing an anticorrosive material according to exemplary embodiments of the inventive concept may include: providing a metal material powder, a non-metal corrosion resistant material powder and a binder; preparing metal material powder, nonmetal corrosion resistant material powder and a binder into slurry; the slurry is subjected to spray drying treatment, thereby obtaining an anticorrosive material including a plurality of anticorrosive particles.
According to an exemplary embodiment, the step of providing a metallic material, a non-metallic corrosion resistant material, and a binder may include providing a metallic material powder, a non-metallic corrosion resistant material powder, and a binder, respectively. The metallic material may include at least one of titanium, titanium alloy, stainless steel, nickel, and nickel alloy. The nonmetallic corrosion-resistant material may include AT least one of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, iron oxide, aluminum oxide, AT series material (composite material of titanium oxide and aluminum oxide), and silicon oxide. In addition, the binder may include a cellulose-based binder. The cellulose-based binder may include at least one of cellulose-based binders such as a hydroxymethyl cellulose-based binder, a hydroxyethyl cellulose-based binder, a hydroxypropyl methyl cellulose-based binder, and the like. However, the inventive concept is not limited thereto and a person skilled in the art may choose a suitable binder under the teaching of the inventive concept.
In addition, in order to make the grain sizes of the metal material powder and the nonmetal corrosion resistant material powder not differ as much as possible, the step of providing the metal material and the nonmetal corrosion resistant material may further include a step of subjecting the metal material and the nonmetal material to grinding treatment to obtain the metal material powder and the nonmetal material powder, respectively, so as to facilitate the subsequent processes such as pulping and spraying. However, the inventive concept is not limited thereto, and the grinding step may be omitted.
According to an exemplary embodiment, the particle size of the metal material powder may be in the range of 10 μm to 50 μm, and the particle size of the non-metal corrosion resistant material powder may be in the range of 1 μm to 10 μm. According to the present application, by controlling the particle diameter of the metal material powder and the particle diameter of the nonmetallic material powder each within the above-described ranges, it is possible to ensure that nonmetallic corrosion-resistant material particles are coated on the surfaces of the metal material particles in the subsequent spraying process to form corrosion-resistant particles.
In the step of providing the metal material powder, the non-metal corrosion-resistant material powder, and the binder, the amounts of the three may be controlled so that the amount of the metal material powder does not exceed 30 parts by weight, based on 100 parts by weight of the total of the three, the amount of the binder is in the range of 0.1 to 2 parts by weight, and the balance is the non-metal corrosion-resistant material powder.
After the metal material powder, the non-metal corrosion resistant material powder, and the binder are prepared, a pulping process may be performed. In the pulping process, the binder may be first prepared as a slurry, and then the metal material powder and the non-metal corrosion-resistant material powder may be added together or separately to the slurry, thereby obtaining a slurry. According to an exemplary embodiment of the present application, the metal material powder and the non-metal corrosion resistant material powder may be pre-mixed and then added to a slurry including a binder in the form of a mixture, thereby obtaining a slurry. According to another exemplary embodiment of the present application, the metal material powder and the non-metal corrosion resistant material powder may be simultaneously added to a slurry including a binder, respectively, to thereby obtain a slurry. According to still another exemplary embodiment of the present application, the metal material powder and the non-metal corrosion resistant material powder may be added to the slurry including the binder sequentially (the order of addition of the two is interchangeable), respectively, to thereby obtain the slurry. The inventive concept is not limited to the order of addition of the metallic material powder and the nonmetallic corrosion-resistant material powder.
According to exemplary embodiments of the inventive concept, the slurry may include a binder, a dispersant, a defoamer, and deionized water. Here, as described above, the binder may include a cellulose-based binder, the defoamer may include polyether-modified silicone oil and/or silicone oil, and the dispersant may include citric acid and/or triethylhexyl phosphoric acid. However, the present inventive concept is not limited to the components of the defoamer and the dispersant, and since the dispersant and the defoamer are used as auxiliaries to more uniformly disperse the metallic material and the nonmetallic corrosion-resistant material in the slurry, a person skilled in the art may select other suitable auxiliaries as needed.
According to an exemplary embodiment, the slurry may include 1% to 4% of a binder, 0.5% to 1% of a dispersant, 1% to 2% of a defoamer, and the balance deionized water in weight percent. According to an exemplary embodiment, the weight ratio of dispersant and defoamer in the slurry is proportional to the weight ratio of binder, respectively, that is, the higher the content of binder, the higher the weight ratio of dispersant and defoamer. Since the particle diameter of the metal material is smaller, the smaller the particle diameter is, the larger the surface area thereof is for the same mass of the metal material, and thus more nonmetallic corrosion-resistant material is required. When the proportion of the binder in the slurry is less than 1% by weight, the binder is less than 1% by weight, granulation cannot be effectively performed, and when the proportion of the binder in the slurry is more than 4% by weight, the binder is higher, agglomeration after subsequent spray sintering is easily caused, and production efficiency is reduced.
After the slurry is prepared, the prepared metal material powder and non-metal corrosion resistant material powder are added to the slurry in such a manner that the weight of the solids (powder) in the slurry is 20% to 70% of the total weight of the slurry (for example, preferably, 30% to 60%, more preferably, 40% to 50%). In the above slurry, the more the slurry content, the less the weight ratio of solids, but when the weight ratio of solids in the slurry is less than 20%, the granulating time is long and the cost is too high; when the weight ratio of the solids in the slurry is more than 70%, the solids content is high, the slurry in the slurry is low, and the subsequent spraying process cannot be performed stably, so that the production stability is affected.
After the slurry is prepared, the slurry may be subjected to a spray drying process. According to an exemplary embodiment of the present application, the slurry may be transferred to a high-speed liquid-slinging disc of 6000 rpm to 15000 rpm, and then slinged by the high-speed rotating liquid-slinging disc to form droplets, and then the droplets are blown into a drying tower of 100 to 400 ℃ by hot wind of 60 to 100 ℃ so that the droplets blown into the tower undergo residence for 5 to 15 seconds during descent, thereby forming solid particles such as spherical shapes coated with a nonmetallic corrosion-resistant material on the metallic material. Here, the lower temperature hot air may reduce binder loss, so that more binder may remain in the formed anti-corrosion particles. In addition, since the particle size of the raw material powder is small, and the particle size of the composite material formed after the adhesive is adhered is also relatively small, a relatively low rotation speed is required to throw out the powder.
After spray drying, the anticorrosive particles of the nonmetallic corrosion-resistant material coated with the metallic material can be obtained. However, such particles may have moisture present, and thus, in order to remove the moisture present therein, the corrosion protection particles may be subjected to a sintering treatment. Specifically, sintering is completed by raising the temperature at a certain temperature raising rate and for a certain time. The sintering curve can be formulated according to the physical properties of the raw material powder. Because of the smaller particle size of the powder, the slower temperature rise rate and shorter holding time can achieve the desired effect, and according to an exemplary embodiment of the present application, the initial temperature of sintering can be 20-30 ℃, the temperature rise rate can be 5-10 ℃/min, the final temperature can be 150-200 ℃, and the holding time can be 3-10 h.
After the above steps, the final anticorrosive particles can be obtained. The anti-corrosion particles may then be screened to obtain particles of different size ranges.
The anticorrosive material including a plurality of anticorrosive particles formed by using the above process may be sprayed on a surface (e.g., an inner surface and/or an outer surface of a cooker) of a substrate using a process such as a formation layer of a spray process (e.g., a cold spray process, a hot spray process) to form an anticorrosive layer having excellent anticorrosive properties.
Example 1
Titanium powder having an average particle diameter of 40 μm and titanium oxide powder having an average particle diameter of 5 μm were prepared.
Hydroxymethyl cellulose, citric acid, polyether modified silicone oil and deionized water were mixed to prepare a slurry. In the slurry, the weight percentage of the hydroxymethyl cellulose is 1.5 percent, the citric acid is 0.7 percent, the polyether modified silicone oil is 1.6 percent, and the balance is deionized water.
Titanium particles and titanium oxide particles were mixed with the above slurry to prepare a slurry. Wherein, the weight ratio of the titanium particles to the titanium oxide particles is 1:4, the weight of the titanium particles and the titanium oxide particles accounts for 45% of the weight of the slurry.
Titanium powder and titanium oxide powder were mixed with the above slurry to prepare a slurry.
And carrying out spray drying treatment on the slurry. Specifically, the slurry is conveyed to a high-speed liquid throwing disc of 12000 revolutions per minute, the slurry is thrown out by the high-speed liquid throwing disc to form drops, and then the drops are blown into a drying tower of 300 ℃ by hot air of 80 ℃, so that the drops blown into the tower fall after 8-10 seconds of residence, and corrosion-resistant particles are formed.
And after spray drying, sintering the anti-corrosion particles to obtain the final anti-corrosion particles. Here, the sintering mechanism is: sintering was completed by heating from 25℃to 180℃at a heating rate of 6℃per minute and holding at 180℃for 8 hours.
In the obtained anticorrosive particle powder, the hydroxymethyl cellulose accounts for 1.5wt%, and the mass ratio of the titanium particles to the titanium oxide particles is 1:4.
The anticorrosive particles are then sieved to obtain particles having a particle size in the range 50 μm to 100 μm.
The inner wall surface of the pot was thermally sprayed by the thermal spraying process using the above-obtained anti-corrosion material including a particle diameter in the range of 60 μm to 80 μm, thereby obtaining an anti-corrosion layer having a thickness of 100 μm formed thereon. Here, the following thermal spray parameters were employed: current flow: 350A; voltage: 55V; main gas (argon) flow: 2200L/H; hydrogen flow rate: 50L/H; powder feeding air flow rate: 400L/H; powder feeding amount: 55g/min; spray (distance of gun nozzle from workpiece) distance: 18cm; spray angle: 60 °; workpiece temperature: 25 ℃ (normal temperature).
Example 2
The difference from example 1 is that: the metal corrosion resistant material is nickel powder.
Example 3
The difference from example 1 is that: the nonmetallic corrosion resistant material is titanium nitride.
Example 4
The difference from example 1 is that: the mass ratio of titanium particles to titanium oxide particles was 1:2.5.
Example 5
The difference from example 1 is that: the mass ratio of titanium particles to titanium oxide particles was 1:9.
Example 6
The difference from example 1 is that: the binder content was 0.2wt%.
Example 7
The difference from example 1 is that: the binder content was 1.8wt%.
Example 8
The difference from example 1 is that: the particle size of the titanium oxide was 3. Mu.m.
Example 9
The difference from example 1 is that: the particle size of the titanium oxide was 9. Mu.m.
Comparative example 1
The difference from example 1 is that: the mass ratio of titanium particles to titanium oxide particles was 1:2.
Comparative example 2
The difference from example 1 is that: the particle size of the titanium oxide was 12. Mu.m.
Comparative example 3
The difference from example 1 is that: titanium powder having an average particle diameter of 40 μm was directly mixed with titanium oxide powder having an average particle diameter of 5 μm, and then the inner wall surface of the iron pan was thermally sprayed by the same thermal spraying process as in example 1, thereby obtaining an anticorrosive layer having a thickness of 100 μm formed thereon.
Comparative example 4
The surface of the inner wall of the iron pan was sequentially thermally sprayed with titanium powder (transition layer material) and titanium oxide powder (closing layer material), thereby obtaining an anticorrosive coating having a thickness of 100 μm formed thereon.
The anticorrosive layers obtained by the above examples 1 to 9 and comparative examples 1 to 4 were subjected to rust inhibitive tests with the following test criteria: referring to the corrosion resistance testing method of the plating pot in GB/T32432, the longer the time is, the better the corrosion resistance is. The test results are shown in Table 1 below, recorded once at 0.5H.
TABLE 1
As can be seen from table 1, the anticorrosive coatings of examples 1 to 9 according to the inventive concept were each better in anticorrosive effect than the anticorrosive coatings of comparative examples 1 to 4, and in particular, the anticorrosive coatings of examples 1 to 9 according to the inventive concept, which were prepared by the granulation method, were far better in anticorrosive effect than the anticorrosive coating of comparative example 3, which was prepared by directly mixing a metal material and a nonmetallic corrosion-resistant material, and the anticorrosive coating of comparative example 4, which was prepared by spraying a metal material and a nonmetallic corrosion-resistant material in sequence. In addition, the results of table 1 also show that: the higher the weight ratio of the nonmetallic corrosion-resistant material is, the better the corrosion resistance of the prepared corrosion-resistant coating is on the premise that the weight of the metallic material is not more than 30% of the total weight of the corrosion-resistant particles; on the premise that the weight of the binder is 0.1-2% of the total weight of the anti-corrosion particles, the higher the content of the binder, the better the corrosion resistance of the prepared anti-corrosion coating; the smaller the particle size of the non-metallic corrosion-resistant material powder, the better the corrosion resistance of the produced corrosion-resistant coating, on the premise that the particle size of the metallic material powder is in the range of 10 μm to 50 μm and the particle size of the non-metallic corrosion-resistant material powder is in the range of 1 μm to 10 μm.
Thus, according to embodiments of the present disclosure, the corrosion protection material is made by a granulation process using a metallic material (transition layer material) and a non-metallic corrosion resistant material (seal layer material). The anti-corrosion material is formed on the surface of the cooker through a spraying process, so that an anti-corrosion coating layer is formed. The anti-corrosion coating can be well combined with a base material, has a good sealing effect in the coating, achieves the technical effect that the anti-corrosion purpose can be achieved by using one layer of coating, and simultaneously improves the production efficiency and reduces the production cost.
Although the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art or those having ordinary skill in the art that various modifications and changes may be made to the present invention without departing from the spirit and technical field of the present invention as described in the appended claims. Therefore, the technical scope of the present invention should not be limited to what is described in the specific embodiments of the specification, and the claimed invention should be defined by the claims.

Claims (5)

1. An anticorrosive material, characterized in that the anticorrosive material comprises a plurality of anticorrosive particles, wherein each anticorrosive particle comprises a metallic material and a nonmetallic anticorrosive material coated on the surface of the metallic material by a binder,
wherein the weight of the metallic material is not more than 30% of the total weight of the anticorrosive particles, the weight of the binder is 0.1% to 2% of the total weight of the anticorrosive particles, the balance being a non-metallic corrosion resistant material,
wherein the metallic material comprises AT least one of titanium, titanium alloy, stainless steel, nickel and nickel alloy, the nonmetallic corrosion-resistant material comprises AT least one of titanium oxide, titanium nitride, titanium carbide, ferric oxide, aluminum oxide, AT series material and silicon oxide, the binder comprises a cellulose-based binder, and
wherein the particle diameter of the anticorrosive particles is in the range of 20 μm to 100 μm.
2. A method of preparing the corrosion protection material of claim 1, comprising the steps of:
providing a metal material powder, a non-metal corrosion resistant material powder and a binder;
preparing metal material powder, nonmetal corrosion resistant material powder and a binder into slurry;
spray drying the slurry to obtain an anticorrosive material comprising a plurality of anticorrosive particles,
wherein the step of providing a metallic material powder, a non-metallic corrosion resistant material powder, and a binder further comprises: and grinding the metal material and the nonmetal corrosion resistant material respectively to obtain metal material powder and nonmetal corrosion resistant powder, wherein the particle size of the metal material powder is 10-50 mu m, and the particle size of the nonmetal corrosion resistant material powder is 1-10 mu m.
3. The method according to claim 2, wherein the method further comprises: after the spray drying treatment, the corrosion-resistant material is sintered.
4. The method of claim 2, wherein the sum of the weight of the metallic material powder and the non-metallic corrosion resistant material powder in the slurry is 20% to 70% of the total weight of the slurry.
5. An anticorrosive coating, characterized in that the anticorrosive coating is formed by spraying the anticorrosive material according to claim 1 on the surface of a base material of a cooker.
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US4039318A (en) * 1976-07-19 1977-08-02 Eutectic Corporation Metaliferous flame spray material for producing machinable coatings
US5122182A (en) * 1990-05-02 1992-06-16 The Perkin-Elmer Corporation Composite thermal spray powder of metal and non-metal
US20130260166A1 (en) * 2012-04-02 2013-10-03 Kennametal Inc. Coated Titanium Alloy Surfaces
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