CN116397190A - Hole sealing method for improving high-pressure corrosion resistance and erosion resistance of plasma spraying ceramic coating - Google Patents
Hole sealing method for improving high-pressure corrosion resistance and erosion resistance of plasma spraying ceramic coating Download PDFInfo
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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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
- C23C4/18—After-treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention belongs to the technical field of surface engineering, relates to the technical field of plasma spraying, and in particular relates to a hole sealing method for improving high-pressure corrosion resistance and erosion resistance of a plasma spraying ceramic coating. The method comprises the steps of carrying out surface strengthening treatment on the plasma sprayed ceramic coating by impregnating a precursor solution, and then carrying out hole sealing treatment on the coating by using a hole sealing agent. The hole sealing method can effectively improve the interface bonding performance between the organic hole sealing agent and the inorganic coating in the ceramic coating, thereby solving the problems that the bonding at the organic-inorganic interface is weak and the corrosion medium is easy to permeate under the high pressure condition to cause corrosion protection failure in the traditional hole sealing mode. Meanwhile, the phenomenon that ceramic particles are easily peeled off from interface joints in a service environment with erosion conditions is effectively reduced, so that erosion resistance of the ceramic coating is improved. Therefore, the invention enables the plasma sprayed ceramic coating to obtain good high-pressure corrosion resistance and erosion abrasion resistance.
Description
Technical Field
The invention belongs to the technical field of surface engineering, relates to the technical field of plasma spraying, and in particular relates to a hole sealing method for improving high-pressure corrosion resistance and erosion resistance of a plasma spraying ceramic coating.
Background
The plasma spray ceramic coating has excellent physical and chemical properties and good adhesion with metals, so that the plasma spray ceramic coating is widely applied to the modern industrial and military fields such as petrochemical industry, aerospace, ships and the like. However, plasma sprayed ceramic coatings under conventional conditions exhibit a typical layered structure with a large number of unbound interfaces, pores and vertical cracks present in the coating. The three are mutually connected to form a through pore channel, so that the spray-coating cannot be directly applied to corrosion protection of liquid media. Therefore, in the practical application process, the hole sealing treatment is generally carried out by adopting organic filler so as to prevent the penetration of corrosive medium, thereby achieving the purpose of corrosion protection. However, the physical and chemical properties of the organic pore sealing filler and the inorganic coating material are greatly different, and the interface bonding between the two materials is usually in a weak bonding state. Although the conventional hole sealing process can generally meet the corrosion resistance requirement of service conditions under conventional corrosion conditions, the corrosion resistance is often only dependent on the intrinsic corrosion resistance of coating materials and organic fillers, so that under some more severe service environments with pressure conditions (such as deep sea environments, high-pressure reaction kettles and the like), the phenomenon that corrosive media permeate from an organic/inorganic weak bonding interface of the organic fillers and the inorganic coatings under high-pressure conditions can occur, hole sealing failure is caused, the corrosion resistance of the coatings is obviously reduced, and the requirements of service performance and service life cannot be met. Meanwhile, under the condition of particle erosion (such as a deep sea water flow environment with sediment), the organic/inorganic weak interface in the coating is also easily damaged, so that ceramic particles are quickly peeled off, and the protection failure of the coating is accelerated.
Therefore, a new hole sealing method is necessary to be developed through the design of materials and hole sealing processes, so that the binding force between the organic filler and the inorganic coating is improved, and the high-pressure corrosion resistance and the erosion resistance of the plasma spraying ceramic coating are improved, so that the method has important significance for meeting the protection of key parts of deep sea equipment.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a hole sealing method for improving the high-pressure corrosion resistance and erosion resistance of a plasma spraying ceramic coating, and solves the problem that the combination of an organic-inorganic interface is weak in the traditional hole sealing mode, so that a corrosive medium is permeated under high pressure conditions (such as a deep sea environment) to cause the failure of corrosion protection. Meanwhile, due to the enhancement of the organic/inorganic interface bonding performance in the coating, the phenomenon that ceramic particles are peeled off from the interface bonding position in the service environment with erosion conditions (such as high-speed water flow with sediment) is effectively reduced, so that the erosion resistance of the ceramic coating is improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a hole sealing method for improving high-pressure corrosion resistance and erosion resistance of a plasma spraying ceramic coating, which comprises the following steps:
s1, spraying a ceramic coating on the surface of a metal matrix by adopting a plasma spraying method;
s1, impregnating a precursor solution on the surface of a ceramic coating, wherein the precursor is gamma-aminopropyl triethoxysilane or gamma- (2, 3-glycidoxy) propyl trimethoxysilane;
s3, coating an organic hole sealing agent on the surface of the infiltrated coating to carry out hole sealing treatment on the coating.
Preferably, the material of the ceramic coating is selected from MgO, zrO 2 、Al 2 O 3 、Cr 2 O 3 、TiO 2 、A 2 O 3 -3％TiO 2 (AT3)、Al 2 O 3 -13％TiO 2 (AT13)、Al 2 O 3 -40％TiO 2 (AT 40). The material of the ceramic coating is selected from typical corrosion resistant ceramic coating materials having excellent corrosion resistance properties.
Preferably, the organic hole sealing agent comprises an epoxy resin type hole sealing agent and an alkyl sulfonic acid type hole sealing agent. Other commercial hole sealing agents are also suitable for the invention, and the proportion of the hole sealing agent and the curing agent and the viscosity of the glue solution can be adjusted according to different application requirements and hole sealing processes. The epoxy resin type hole sealing agent has good chemical stability, acid resistance and alkali resistance, and the shrinkage rate of the epoxy resin after being cured into a film is low, so that the curing is convenient, and the construction process is simple in application.
According to the hole sealing method, typical corrosion-resistant ceramic coating with excellent corrosion resistance is used as a raw material, gamma-aminopropyl triethoxysilane or gamma- (2, 3-glycidoxy) propyl trimethoxysilane is selected for carrying out infiltration treatment on a spray coating, surface strengthening is carried out on an unbonded interface in the coating, and finally commercial hole sealing agents such as epoxy resin type and alkyl sulfonic acid are used for carrying out hole sealing treatment on the coating. The precursor solution is used for surface strengthening, so that the combination of an organic/inorganic interface in the coating is obviously improved, the combination strength of the organic hole sealing agent and the modified coating is high, and the hole sealing coating has excellent high-pressure corrosion resistance. Meanwhile, the bonding strength of the organic hole sealing agent and the modified coating hole is high, the peeling resistance between the ceramic particle layer and the organic hole sealing agent is increased in the erosion process, the erosion rate of the coating is low, and the hole sealing coating has excellent erosion resistance.
The hole sealing method can effectively improve the interface bonding performance between the organic hole sealing agent and the inorganic coating in the ceramic coating, thereby solving the problems that the bonding at the organic-inorganic interface is weak and the corrosion medium is easy to permeate under high pressure conditions (such as deep sea environment) to cause corrosion protection failure in the traditional hole sealing mode. Meanwhile, the method enhances the bonding performance of the organic/inorganic interface in the coating, thereby effectively reducing the phenomenon that ceramic particles are easy to peel off from the interface bonding position under the service environment with erosion conditions (such as high-speed water flow with sediment), and further improving the erosion resistance of the ceramic coating. Therefore, through the modified hole sealing treatment, the plasma spraying ceramic coating can obtain good high-pressure corrosion resistance and erosion abrasion resistance, so that the plasma spraying ceramic coating subjected to hole sealing treatment has important application prospects in metal corrosion protection in the fields of ocean engineering equipment, ships, chemical industry and the like.
Preferably, the metal matrix comprises a stainless steel matrix, a carbon steel matrix and an alloy matrix, and the metal matrix is subjected to surface sand blasting roughening treatment before ceramic coating is sprayed.
Preferably, the concentration of the precursor solution is 3-15%, the solvent is an aqueous solution of alcohol, and the alcohol is ethanol, or ethylene glycol, or isopropanol.
Preferably, the precursor solution is impregnated and then dried by heating at 50-100deg.C for 4-12 hr.
Preferably, the coating is a two-shot brushing or spraying process.
Preferably, after the organic hole sealing agent is coated, the organic hole sealing agent is dried and cured for 2-24 hours at the room temperature to 80 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a hole sealing method for improving high-pressure corrosion resistance and erosion resistance of a plasma spraying ceramic coating. According to the invention, the plasma spraying ceramic coating is impregnated with the precursor solution, so that the surface modification is successfully carried out on the uncombined interface inside the coating, thereby obviously improving the bonding performance of the organic/inorganic interface inside the coating after hole sealing treatment, effectively preventing corrosive medium from penetrating through the organic/inorganic interface between the hole sealing agent and the coating to corrode the coating in a deep sea and other high-pressure environment, and enabling the plasma spraying ceramic coating after hole sealing treatment to have good high-pressure corrosion resistance. Meanwhile, the organic/inorganic interface combination reinforcement after hole sealing treatment also effectively improves the erosion resistance of the coating. Therefore, the invention provides a novel hole sealing method for improving the high-pressure corrosion resistance and erosion resistance of the plasma spraying ceramic coating, and has important application prospect in metal corrosion protection in the fields of ocean engineering equipment, ships, chemical industry and the like.
Drawings
Fig. 1 is a flow chart of a sealing process of a plasma sprayed ceramic coating.
Detailed Description
The following describes the invention in more detail. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The experimental methods in the following examples, unless otherwise specified, are conventional, and the experimental materials used in the following examples, unless otherwise specified, are commercially available.
Example 1 sealing method of plasma spray ceramic coating
As shown in fig. 1, the hole sealing method of the coating comprises the following steps:
(1) Spraying Al on the surface of the Q235 carbon steel matrix after sand blasting coarsening by adopting an European Kang Meike M plasma spraying system 2 O 3 The spraying power of the ceramic coating is 36kW, the spraying distance is 80mm, and the thickness of the coating is 150um;
(2) Dropwise adding a gamma-aminopropyl triethoxysilane solution with the concentration of 10% into an isopropanol water solution with the concentration of 1mol/L to obtain a precursor solution, wherein the final concentration of the gamma-aminopropyl triethoxysilane is 2%, then impregnating the surface of the ceramic coating with the precursor solution in a spraying manner, fully wetting the surface to be sprayed with the solution without obvious flow, standing at room temperature for 0.5h, and then placing the impregnated and modified workpiece in a drying box, and drying at 70 ℃ for 12h;
(3) The modified coating is subjected to hole sealing treatment by adopting a secondary brushing method and using epoxy resin as a hole sealing agent, wherein the brushing technology is a conventional hole sealing treatment technology (Hou Yanfeng, xu Likun, shen Chengjin, and the like) 2 O 3 Electrochemical characterization of the Corrosion resistance of the coating [ J]Chinese corrosion and protection journal, 2012,32 (6): 5.), drying and curing for 24 hours at room temperature, polishing to remove superfluous hole sealing agent on the surface layer after curing, and completing the hole sealing treatment process.
The corrosion resistance of the coating was characterized in a high pressure reactor. The testing method comprises the following steps: 3.5% NaCl solution is used as corrosive medium to seal holeThe treated pattern was placed in an autoclave and argon was used to apply a pressure of 5Mpa (corresponding to a pressure of 500m water depth environment) to the test system. In the initial stage, the polarization impedance of the coating layer in the low frequency band, which adopts the conventional hole sealing treatment (only steps (1) and (3)) and the modified hole sealing treatment, reaches 10 10 Ωcm 2 Indicating that both have good corrosion protection effect. However, as the soaking process progresses, the corresponding resistance of the coating pattern with conventional pore sealing treatment is reduced, and the corresponding resistance is reduced to 10 when the coating pattern is soaked at high pressure until the 5 th day 9 Ωcm 2 The magnitude indicated that the corrosion resistance of the coating was decreasing and at day 10 the sample showed a diffusion resistance indicating that the corrosive medium had penetrated from the coating to the surface of the metal substrate. However, the coating prepared by the modified pore sealing technology of this example showed little change in the impedance modulus of the coating after being immersed in high pressure for 20 days under the above conditions, indicating that the coating has excellent high pressure corrosion resistance.
Al with a particle diameter of 250 μm and a polygonal angle 2 O 3 The particles serve as erosion particles to characterize the erosion properties of the coating. The pressure of the etching gas is 0.4MPa, and the etching angle is 90. The results show that the erosion rate of the coating subjected to the modified hole sealing treatment in the embodiment is reduced by about 50% compared with that of the coating subjected to the conventional unmodified hole sealing treatment, namely, the erosion resistance of the coating subjected to the modified treatment is improved by 2 times, and the modified hole sealing treatment coating has excellent erosion resistance.
Example 2 sealing method of plasma sprayed ceramic coating
The general hole sealing method is the same as in example 1, except that: and (3) dropwise adding a gamma-aminopropyl triethoxysilane solution with the concentration of 5% into an ethanol water solution with the concentration of 1mol/L to obtain a precursor solution.
As in example 1, the coating obtained by the modified pore sealing treatment of this example has excellent high pressure corrosion resistance and erosion resistance as compared with the conventional pore sealing treatment.
Example 3 sealing method of plasma sprayed ceramic coating
(1) By plasma sprayingCr is sprayed on the surface of the Q235 carbon steel matrix after sand blasting coarsening by the method 2 O 3 Ceramic coating, the thickness of the coating is 100um;
(2) Dropwise adding a gamma-aminopropyl triethoxysilane solution with the concentration of 10% into an ethanol water solution with the concentration of 1mol/L to obtain a precursor solution, then impregnating the surface of the ceramic coating with the precursor solution, placing the impregnated and modified workpiece in a drying box, and drying at 70 ℃ for 12 hours;
(3) And (3) carrying out hole sealing treatment on the modified coating by using epoxy resin as a hole sealing agent by adopting a secondary brushing method, drying and curing for 24 hours in a room temperature environment after the treatment, and polishing to remove superfluous hole sealing agent on the surface layer after the curing is finished, thereby completing the hole sealing treatment process.
As in example 1, the coating obtained by the modified pore sealing treatment of this example has excellent high pressure corrosion resistance and erosion resistance as compared with the conventional pore sealing treatment.
Example 4 sealing method of plasma sprayed ceramic coating
The general hole sealing method is the same as in example 3, except that: and (3) dropwise adding a gamma-aminopropyl triethoxysilane solution with the concentration of 5% into an ethanol water solution with the concentration of 1mol/L to obtain a precursor solution.
As in example 1, the coating obtained by the modified pore sealing treatment of this example has excellent high pressure corrosion resistance and erosion resistance as compared with the conventional pore sealing treatment.
Example 5 sealing method of plasma sprayed ceramic coating
The general hole sealing method is the same as in example 3, except that: spraying TiO on the surface of the Q235 carbon steel matrix after sand blasting coarsening by adopting a plasma spraying method 2 Ceramic coating, the thickness of the coating is 100um;
as in example 1, the coating obtained by the modified pore sealing treatment of this example has excellent high pressure corrosion resistance and erosion resistance as compared with the conventional pore sealing treatment.
Example 6 sealing method of plasma spray ceramic coating
The general hole sealing method is the same as that of the solid hole sealing methodExample 4 differs in that: spraying TiO on the surface of the Q235 carbon steel matrix after sand blasting coarsening by adopting a plasma spraying method 2 Ceramic coating, the thickness of the coating is 100um;
as in example 1, the coating obtained by the modified pore sealing treatment of this example has excellent high pressure corrosion resistance and erosion resistance as compared with the conventional pore sealing treatment.
Comprehensive examples 1-6 show that the hole sealing method solves the problem that the corrosion protection is ineffective due to the fact that the combination of an organic-inorganic interface is weak under the traditional hole sealing mode, and corrosive medium is permeated under high pressure conditions (such as in a deep sea environment). Meanwhile, due to the enhancement of the organic/inorganic interface bonding performance in the coating, the phenomenon that ceramic particles are peeled off from the interface bonding position in the service environment with erosion conditions (such as high-speed water flow with sediment) is effectively reduced, so that the erosion resistance of the ceramic coating is improved. Therefore, the plasma spraying ceramic coating subjected to the hole sealing treatment can obtain good comprehensive performances such as high-pressure corrosion resistance, erosion abrasion resistance and the like, so that the service life of the coating is greatly prolonged, the application range of the plasma spraying ceramic coating is enlarged, and the plasma spraying ceramic coating subjected to the hole sealing treatment has important application prospects in metal corrosion protection in the fields of marine engineering equipment, ships, chemical industry and the like.
The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (8)
1. A hole sealing method for improving high-pressure corrosion resistance and erosion resistance of a plasma spraying ceramic coating is characterized by comprising the following steps:
s1, spraying a ceramic coating on the surface of a metal matrix by adopting a plasma spraying method;
s1, impregnating a precursor solution on the surface of a ceramic coating, wherein the precursor is gamma-aminopropyl triethoxysilane or gamma- (2, 3-glycidoxy) propyl trimethoxysilane;
s3, coating an organic hole sealing agent on the surface of the infiltrated coating to carry out hole sealing treatment on the coating.
2. The hole sealing method for improving the high pressure corrosion resistance and the erosion resistance of the plasma sprayed ceramic coating according to claim 1, wherein the ceramic coating is made of a material selected from the group consisting of MgO and ZrO 2 、Al 2 O 3 、Cr 2 O 3 、TiO 2 、A 2 O 3 -3％TiO 2 、Al 2 O 3 -13％TiO 2 、Al 2 O 3 -40％TiO 2 At least one of them.
3. The hole sealing method for improving the high-pressure corrosion resistance and the erosion resistance of the plasma spraying ceramic coating according to claim 1, wherein the metal matrix comprises a stainless steel matrix, a carbon steel matrix and an alloy matrix, and the metal matrix is subjected to surface sand blasting roughening treatment before the ceramic coating is sprayed.
4. The hole sealing method for improving the high pressure corrosion resistance and the erosion resistance of the plasma sprayed ceramic coating according to claim 1, wherein the concentration of the precursor solution is 3-15%, the solvent is an aqueous solution of alcohol, and the alcohol is ethanol, ethylene glycol or isopropanol.
5. The hole sealing method for improving the high pressure corrosion resistance and the erosion resistance of the plasma sprayed ceramic coating according to claim 1, wherein the drying treatment is performed after the precursor solution is impregnated, the drying treatment is performed by heating and drying at the temperature of 50-100 ℃ for 4-12 hours.
6. The hole sealing method for improving the high-pressure corrosion resistance and the erosion resistance of the plasma sprayed ceramic coating according to claim 1, wherein the organic hole sealing agent comprises an epoxy resin type hole sealing agent and an alkyl sulfonic acid type hole sealing agent.
7. The hole sealing method for improving the high-pressure corrosion resistance and the erosion resistance of the plasma sprayed ceramic coating according to claim 1, wherein the coating is performed by a secondary brushing method or a spraying method.
8. The hole sealing method for improving the high pressure corrosion resistance and the erosion resistance of the plasma sprayed ceramic coating according to claim 1, wherein the drying and curing are carried out for 2-24 hours at the temperature ranging from room temperature to 80 ℃ after the organic hole sealing agent is coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310229950.0A CN116397190A (en) | 2023-03-10 | 2023-03-10 | Hole sealing method for improving high-pressure corrosion resistance and erosion resistance of plasma spraying ceramic coating |
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