CN116574397B - Coating composition and application thereof in anti-scouring and corrosion-resistant coating - Google Patents
Coating composition and application thereof in anti-scouring and corrosion-resistant coating Download PDFInfo
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- CN116574397B CN116574397B CN202310488490.3A CN202310488490A CN116574397B CN 116574397 B CN116574397 B CN 116574397B CN 202310488490 A CN202310488490 A CN 202310488490A CN 116574397 B CN116574397 B CN 116574397B
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- 238000000576 coating method Methods 0.000 title claims abstract description 166
- 239000011248 coating agent Substances 0.000 title claims abstract description 158
- 239000008199 coating composition Substances 0.000 title claims abstract description 40
- 238000005260 corrosion Methods 0.000 title claims abstract description 36
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000009991 scouring Methods 0.000 title claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 75
- 239000000843 powder Substances 0.000 claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 38
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 54
- 230000006698 induction Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 24
- 230000003628 erosive effect Effects 0.000 claims description 23
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 20
- 229910001120 nichrome Inorganic materials 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000005219 brazing Methods 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 7
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 229910009043 WC-Co Inorganic materials 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 229920005749 polyurethane resin Polymers 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 42
- 230000003647 oxidation Effects 0.000 abstract description 22
- 238000007254 oxidation reaction Methods 0.000 abstract description 22
- 238000011010 flushing procedure Methods 0.000 abstract description 6
- 230000002195 synergetic effect Effects 0.000 abstract description 5
- 208000035874 Excoriation Diseases 0.000 description 41
- 238000012360 testing method Methods 0.000 description 41
- 230000008859 change Effects 0.000 description 39
- 239000000463 material Substances 0.000 description 24
- 229910000975 Carbon steel Inorganic materials 0.000 description 17
- 239000010962 carbon steel Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 7
- 229910052593 corundum Inorganic materials 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 6
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- 239000000428 dust Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000010963 304 stainless steel Substances 0.000 description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 4
- 238000005524 ceramic coating Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of pipeline protection, and particularly relates to a coating composition and application thereof in a scouring-resistant corrosion-resistant coating. The invention discloses a coating composition, which comprises composite powder and a binder, wherein the composite powder comprises the following components in percentage by mass (10-20): (3-5): (3-5), a composite carbide, a composite oxide and a composite metal powder. The coating composition can make the prepared coating have excellent abrasion resistance and flushing resistance and also have excellent corrosion resistance and oxidation resistance through the synergistic effect of the composite carbide, the composite oxide and the composite metal powder.
Description
Technical Field
The invention belongs to the technical field of pipeline protection, and particularly relates to a coating composition and application thereof in a scouring-resistant corrosion-resistant coating.
Background
The pipeline of the thermal power ash removal system has severe operation conditions, and under the conditions of high speed and hard particle-containing powder ash flushing, the inner wall of the pipeline is often severely abraded, so that the service life of the pipeline is shortened, and the safe, stable and economic operation of a unit is seriously influenced. Therefore, based on comprehensive technical requirements of abrasion resistance, erosion resistance, corrosion resistance and the like of the thermal power ash removal pipeline, development of a pipeline inner wall coating preparation method with simple process, good economy and good abrasion resistance and erosion resistance is urgently needed.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
Most of the prior protection technologies are only suitable for the outer surface of the pipeline, and the protection technologies of the inner wall of the pipeline are relatively complex to implement and are influenced by the pipe diameter, so that the protection technologies of the inner wall of the pipeline, such as abrasion resistance, scouring resistance, corrosion resistance and the like, are relatively deficient.
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a coating composition, and the coating composition prepared by using the coating composition has excellent abrasion resistance and flushing resistance and also has excellent corrosion resistance and oxidation resistance through the synergistic effect of composite carbide, composite oxide and composite metal powder.
The coating composition comprises composite powder and a binder, wherein the composite powder comprises composite carbide, composite oxide and composite metal powder in a mass ratio of (10-20): (3-5).
The coating composition provided by the embodiment of the invention has the advantages and technical effects that 1, in the embodiment of the invention, the added composite carbide can improve the abrasion resistance, abrasion resistance and scouring resistance of the coating, the added composite oxide can improve the corrosion resistance of the coating, and the addition of the composite metal powder can improve the corrosion resistance and oxidation resistance of the coating, simultaneously reduce the difference of thermal expansion performance between the coating and a substrate and can obviously improve the service life of the coating; 2. in the embodiment of the invention, the compound carbide, the compound oxide and the compound metal powder can play a synergistic effect by limiting the dosage ratio of substances, so that the coating has excellent abrasion resistance and flushing resistance and simultaneously has excellent corrosion resistance and oxidation resistance.
In some embodiments, the composite carbide is WC-Co/Ni/NiCr and Cr 3C2 -Co/Ni/NiCr in a mass ratio of (2-3) 1; the mass ratio of the ZrO 2、Cr2O3 and Al 2O3 is 1:1 (3-5); the composite metal powder is Fe, cr and Al with the mass ratio of 1:1 (2-3).
In some embodiments, the mass ratio of the composite powder to the binder is (20-50): 1; the binder comprises at least one of a high molecular binder, silica sol, aluminum sol, tin-based brazing filler metal and zinc-based brazing filler metal.
The embodiment of the invention also provides application of the coating composition in a scouring-resistant and corrosion-resistant coating.
The embodiment of the invention also provides a preparation method of the anti-scouring and corrosion-resistant coating, which comprises the following steps:
(1) An induction heating device and heat insulation cotton are arranged on the outer surface of the pipeline;
(2) Coating the coating composition on the semi-circle of the inner wall of the pipeline, and starting the induction heating device to heat;
(3) And (3) preparing a coating on the inner wall of the residual semi-circumference pipeline by adopting the same method as the step (2) after the pipeline is cooled, and dismantling the induction heating device after the pipeline is cooled.
The method for preparing the scouring corrosion-resistant coating has the advantages and technical effects that 1, the coating prepared by adopting the coating composition has excellent abrasion resistance, scouring resistance and corrosion resistance; 2. according to the method provided by the embodiment of the invention, compared with a method of adopting furnace heat treatment such as a muffle furnace and the like, the range of the protectable pipe diameter is greatly enlarged, and the process convenience and the field applicability are improved; 3. the method provided by the embodiment of the invention can effectively improve the comprehensive properties of abrasion resistance, scouring resistance, corrosion resistance and oxidation resistance of the inner wall of the pipeline, prolong the service life of the pipeline and ensure the safe, stable and economic operation of the unit.
In some embodiments, in the step (2), the heating temperature does not exceed the use temperature of the binder, and the heating time is 2 to 30 minutes.
In some embodiments, in step (2), the coating composition is applied at a thickness of 0.5 to 1.5mm.
In some embodiments, in the step (2), the coating composition is applied to the semicircle of the inner wall of the pipe to form a tile-shaped coating layer, the thickness of the tile-shaped coating layer is gradually decreased from the two side edge regions to the central region, and preferably, the thickness of the two side edge regions of the tile-shaped coating layer is 1.5 to 2 times the thickness of the central region.
In some embodiments, the tile-shaped coating arc is positioned with the top down and the opening facing up.
In some embodiments, the method further comprises removing impurities from the inner wall surface of the pipe prior to the step (1).
Detailed Description
The following detailed description of embodiments of the invention is exemplary and intended to be illustrative of the invention and not to be construed as limiting the invention.
The coating composition provided by the embodiment of the invention comprises composite powder and a binder, wherein the composite powder comprises composite carbide, composite oxide and composite metal powder with the mass ratio of (10-20): (3-5).
According to the coating composition disclosed by the embodiment of the invention, the added composite carbide can improve the abrasion resistance, the abrasion resistance and the scouring resistance of the coating, the added composite oxide can improve the corrosion resistance of the coating, and the addition of the composite metal powder can improve the corrosion resistance and the oxidation resistance of the coating, simultaneously reduce the difference of thermal expansion performance between the coating and a substrate and can obviously improve the service life of the coating; by limiting the dosage ratio of substances, the composite carbide, the composite oxide and the composite metal powder can play a synergistic effect, so that the coating has excellent abrasion resistance and flushing resistance and simultaneously has excellent corrosion resistance and oxidation resistance.
In some embodiments, preferably, the composite carbide is WC-Co/Ni/NiCr and Cr 3C2 -Co/Ni/NiCr in a mass ratio of (2-3): 1; the mass ratio of the ZrO 2、Cr2O3 and Al 2O3 is 1:1 (3-5); the composite metal powder is Fe, cr and Al in the ratio of 1:1 (2-3). Further preferably, the mass ratio of the composite powder to the binder is (20-50): 1; the binder comprises at least one of a high molecular binder, silica sol, aluminum sol, tin-based brazing filler metal and zinc-based brazing filler metal. Still preferably, the polymer adhesive comprises at least one of epoxy resin glue and polyurethane glue.
The metal and ceramic materials have unique excellent properties and obvious performance weaknesses, and how to combine the respective advantages of the metal and ceramic materials is always the direction of research in the fields of material science and engineering; the metal ceramic composite coating technology, namely, evenly distributing ceramic phases with proper particle shapes and sizes on a plastic metal matrix, successfully realizes the combination of the advantages of metal and ceramic, prepares composite materials with the advantages of metal strength and toughness, ceramic high temperature resistance, wear resistance, corrosion resistance and the like, and greatly expands the respective application range of the metal materials and the ceramic materials. In the embodiment of the invention, a Co, ni, niCr-based WC and Cr 3C2 metal ceramic coating with a certain proportion is added, WC and Cr 3C2 have higher hardness and wear resistance and flushing resistance, however, the pure WC and Cr 3C2 ceramic coating have higher brittleness, so that the coating is easy to crack and fall off, and Co, ni, niCr-based WC and Cr 3C2 are more widely applied to the fields of wear resistance, scouring resistance and corrosion resistance compared with other carbide ceramics; meanwhile, WC has excellent wear resistance and high temperature resistance, but has relatively poor oxidation resistance and easy decomposition at high temperature, cr 3C2 has outstanding corrosion resistance and oxidation resistance and excellent wear resistance, so that the two types of metal ceramics are compositely used to achieve the optimal effect; al 2O3 and Cr 2O3 have excellent corrosion resistance, oxidation resistance, abrasion resistance and scouring resistance, zrO 2 has excellent thermal stability and chemical stability, and simultaneously, zrO 2 has extremely low friction coefficient and can effectively increase the toughness of the ceramic coating; fe. The Cr and Al metal powder has excellent plastic toughness and heat conductivity compared with carbide and oxide ceramics, and a certain amount of metal powder is added into the ceramic coating, so that the plastic toughness and oxidation resistance of the coating can be effectively improved. The materials are adopted and limited in a proper dosage range, so that the synergistic effect between the components can be exerted, and the comprehensive performance of the coating is further improved. The embodiment of the invention also provides application of the coating composition in a scouring-resistant and corrosion-resistant coating. The coating composition provided by the embodiment of the invention meets the design and use requirements of the anti-scouring and corrosion-resistant coating, and can be applied to the field of protection of the inner wall of a pipeline.
The embodiment of the invention also provides a preparation method of the anti-scouring and corrosion-resistant coating, which comprises the following steps:
(1) An induction heating device and heat insulation cotton are arranged on the outer surface of the pipeline;
(2) Coating the coating composition disclosed by the embodiment of the invention on a semi-circle of the inner wall of a pipeline, and starting the induction heating device to heat;
(3) And (3) preparing a coating on the inner wall of the residual semi-circumference pipeline by adopting the same method as the step (2) after the pipeline is cooled, and dismantling the induction heating device after the pipeline is cooled.
According to the preparation method of the scouring corrosion-resistant coating, the coating prepared by adopting the coating composition has excellent abrasion resistance and scouring resistance, and also has excellent corrosion resistance and oxidation resistance; by introducing an induction heating mode, compared with a method of adopting furnace heat treatment such as a muffle furnace and the like, the range of the protectable pipe diameter is greatly enlarged, and the process convenience and the field applicability are improved; the anti-abrasion, anti-scouring, anti-corrosion and anti-oxidation comprehensive performance of the inner wall of the pipeline can be effectively improved, the service life of the pipeline is prolonged, and the safe, stable and economic operation of the unit is ensured.
In some embodiments, preferably, in the step (2), the heating temperature does not exceed the use temperature of the binder, and the heating time is 2 to 30 minutes.
In the embodiment of the invention, the lower temperature is adopted for heat treatment, so that the adhesive can be melted to exert the adhesive property, the composite powder can be tightly adhered on the inner wall of the pipeline, the production energy consumption is saved, and the production cost is reduced; if the temperature exceeds the service temperature of the adhesive, i.e., exceeds the upper service temperature limit of the adhesive, the adhesive may fail.
In some embodiments, in step (2), the coating composition has a coating thickness of 0.5 to 1.5mm. Further preferably, in the step (2), the coating composition is applied to the semicircle of the inner wall of the pipe to form a tile-shaped coating, and the tile-shaped coating in the embodiment of the invention is formed by applying the coating on the inner surface of a general pipe to form a semicircular arc surface, and the thickness of the tile-shaped coating gradually decreases from the two side edge regions to the central region, preferably, the thickness of the two side edge regions of the tile-shaped coating is 1.5-2 times the thickness of the central region. Still preferably, the tile-shaped coating is arc-topped downwards and the opening is upwards.
In the embodiment of the invention, after the coating is coated, before the coating is solidified, the edge part easily flows to the center under the action of gravity, the thickness of the edge coating is a little thicker, the thickness of the edge coating can be ensured, and the thickness of the center coating is a little thinner, so that the thickness of the center coating is ensured not to be overlarge.
In some embodiments, it is preferable that the step (1) is preceded by removing impurities from the inner wall surface of the pipe. It is further preferred that the inner wall of the pipe is cleaned by a hard pipe brush.
In the embodiment of the invention, the cleaning of the inner wall of the pipeline is used for removing impurities such as oil stains and dust on the surface, which is favorable for the combination of the coating and the inner wall of the pipeline, and the cleaning by using the hard pipeline brush is favorable for increasing the roughness of the surface of the pipeline, so that the combination force of the coating and the inner wall of the pipeline is further improved.
The invention is described below in connection with specific examples.
Example 1
(1) Uniformly mixing composite carbide (WC-Ni: cr 3C2 -Ni=3:1), composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:5) and composite metal powder (Fe: cr: al=1:1:3) with tin-based brazing filler metal according to a mass ratio of 50:1 to prepare a coating composition;
(2) Cleaning impurities such as greasy dirt and dust on the surface of the pipeline by adopting a hard pipeline brush, and uniformly arranging an induction heating device and heat insulation cotton on the outer surface of the pipeline;
(3) Coating the coating composition on the inner wall of a pipeline to form a tile-shaped coating with the thickness of the coating in the central area of 1.0mm, wherein the thickness of the edge areas at two sides of the tile-shaped coating is 2 times that of the central area, the coating thickness gradually decreases from the edge areas at two sides to the central area, the arc top of the tile-shaped coating is downward, and the opening is upward;
(4) Starting an induction heating device, and heating the coating together with the pipeline at 750 ℃ for 30min;
(5) After the heat treatment of the pipeline is finished and cooled, preparing a coating on the inner wall of the residual semi-circumference pipeline according to the same method, and heating the coating together with the pipeline at 750 ℃ for 30min again;
(6) And after the heat treatment of the pipeline is finished and the pipeline is cooled, dismantling the induction heating related device.
The coating prepared in this example was subjected to performance testing as follows: .
Abrasion resistance test: the adopted equipment is a rubber wheel abrasive particle abrasion testing machine designed and assembled according to the American ASTM-G65-71 standard, the load is 5N, the rotating speed of the rubber wheel is 60 r.min -1, the diameter of the rubber wheel is 220mm, the abrasive particle size is 60 meshes, and the abrasion performance is evaluated by adopting the weight of the abrasion loss of a tested sample; the test uses the average of three samples to characterize the wear loss of the coating. The smaller the abrasion loss weight under certain test conditions, the better the abrasion resistance of the tested sample.
Anti-erosion performance test: the erosion distance is 100mm, the compressed air force is 0.3MPa, the inner diameter of the nozzle is 3.8mm, the length of the nozzle is 22mm, the erosion angle is 30 degrees, the abrasive grain number is 60 meshes, an erosion test is completed according to the corresponding number of sand grains per 100g, weighing is carried out after each time of erosion is completed, and the accumulated erosion abrasion loss quality is taken as the basis. Under certain test conditions, the smaller the erosion weight is, the better the erosion resistance of the tested sample is.
The abrasion loss of the test coating is linear with the amount of abrasive used when the abrasion loss of the test sample is in a stable abrasion stage. Therefore, the erosion wear performance is evaluated by adopting the erosion wear loss weight of the tested sample corresponding to the unit-mass abrasive, and the smaller the erosion wear loss weight is under certain test conditions, the better the erosion wear resistance of the tested coating is.
Testing corrosion resistance: uniformly coating NaCl, na 2SO4 =1:1 composite molten salt on the surface of a coating sample, wherein the coating quality is 50mg/cm 2, then placing the coating sample in a high-temperature box-type resistance furnace with the temperature of 300 ℃, preserving heat for 1h, cooling along with the furnace, and evaluating the corrosion resistance of the coating by testing the weight change of the coating before and after the experiment.
And (3) oxidation resistance test: the coating sample is placed in a high-temperature box-type resistance furnace with the temperature of 300 ℃, is kept for 1h and is cooled along with the furnace, and the oxidation resistance of the coating is evaluated through the change of the coating weight before and after a test experiment.
The matrix material used in this example was carbon steel, and the abrasion resistance, erosion resistance, corrosion resistance and oxidation resistance of the matrix and the coating were tested, respectively. The coating prepared in this example had a weight change rate of not more than 1/5 of the weight change rate of the base material (carbon steel) of the pipe before and after the coating erosion test, not more than 1/8 of the weight change rate of the base material (carbon steel) of the pipe before and after the coating erosion test, not more than 1/3 of the weight change rate of the base material (carbon steel) before and after the coating erosion test, and not more than 1/3 of the weight change rate of the base material (carbon steel) before and after the coating oxidation test at the same initial calculated mass.
Example 2
(1) Uniformly mixing composite carbide (WC-NiCr: cr 3C2 -NiCr=2:1), composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:3) and composite metal powder (Fe: cr: al=1:1:2) with epoxy resin glue according to a mass ratio of 20:1 to prepare a coating composition;
(2) Cleaning impurities such as greasy dirt and dust on the surface of the pipeline by adopting a hard pipeline brush, and uniformly arranging an induction heating device and heat insulation cotton on the outer surface of the pipeline;
(3) Coating the coating composition on the inner wall of a pipeline to form a tile-shaped coating with the thickness of the coating in the central area of 1.0mm, wherein the thickness of the edge areas at two sides of the tile-shaped coating is 2 times that of the central area, the coating thickness gradually decreases from the edge areas at two sides to the central area, the arc top of the tile-shaped coating is downward, and the opening is upward;
(4) Starting an induction heating device, and heating the coating and the pipeline at 100 ℃ for 20min;
(5) After the heat treatment of the pipeline is finished and cooled, preparing a coating on the inner wall of the residual semi-circumference pipeline according to the same method, and heating the coating and the pipeline at 100 ℃ for 20min again;
(6) And after the heat treatment of the pipeline is finished and the pipeline is cooled, dismantling the induction heating related device.
The coatings prepared in this example were subjected to performance testing in the same manner as in example 1.
Under the same initial calculated mass, the weight change rate of the coating prepared in the embodiment before and after the abrasion test does not exceed 1/5 of the weight change rate of the base material (carbon steel) of the pipe, the weight change rate of the coating before and after the abrasion test does not exceed 1/6 of the weight change rate of the base material (carbon steel), the weight change rate of the coating before and after the abrasion test does not exceed 1/2 of the weight change rate of the base material (carbon steel), and the weight change rate of the coating before and after the oxidation test does not exceed 1/3 of the weight change rate of the base material (carbon steel).
Example 3
(1) Uniformly mixing composite carbide (WC-Co: cr 3C2 -Co=3:1), composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:4) and composite metal powder (Fe: cr: al=1:1:2) in a mass ratio of 15:4:4 with polyurethane resin glue according to a mass ratio of 35:1 to prepare a coating composition;
(2) Cleaning impurities such as greasy dirt and dust on the surface of the pipeline by adopting a hard pipeline brush, and uniformly arranging an induction heating wire device and heat insulation cotton on the outer surface of the pipeline;
(3) Coating the coating composition on the inner wall of a pipeline to form a tile-shaped coating with the thickness of the coating in the central area of 1.0mm, wherein the thickness of the edge areas at two sides of the tile-shaped coating is 2 times that of the central area, the coating thickness gradually decreases from the edge areas at two sides to the central area, the arc top of the tile-shaped coating is downward, and the opening is upward;
(4) Starting an induction heating device, and heating the coating and the pipeline at 80 ℃ for 25min;
(5) After the heat treatment of the pipeline is finished and cooled, preparing a coating on the inner wall of the residual semi-circumference pipeline according to the same method, and heating the coating and the pipeline at 80 ℃ for 25min again;
(6) And after the heat treatment of the pipeline is finished and the pipeline is cooled, dismantling the induction heating related device.
The coatings prepared in this example were subjected to performance testing in the same manner as in example 1.
The weight change rate of the coating prepared in this example before and after the coating abrasion test does not exceed 1/5 of the weight change rate of the base material (carbon steel) of the pipe, the weight change rate of the coating before and after the coating abrasion test does not exceed 1/8 of the weight change rate of the base material (carbon steel), the weight change rate of the coating before and after the coating abrasion test does not exceed 1/3 of the weight change rate of the base material (carbon steel), and the weight change rate of the coating before and after the coating oxidation test does not exceed 1/3 of the weight change rate of the base material (carbon steel) under the same initial calculated mass.
Example 4
(1) Uniformly mixing composite carbide (WC-NiCr: cr 3C2 -Co=2:1), composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:4) and composite metal powder (Fe: cr: al=1:1:3) with epoxy resin glue according to a mass ratio of 30:1 to prepare a coating composition;
(2) Cleaning impurities such as greasy dirt and dust on the surface of the pipeline by adopting a hard pipeline brush, and uniformly arranging an induction heating device and heat insulation cotton on the outer surface of the pipeline;
(3) Coating the coating composition on the inner wall of a pipeline to form a tile-shaped coating with the thickness of the coating in the central area of 1.0mm, wherein the thickness of the edge areas at two sides of the tile-shaped coating is 2 times that of the central area, the coating thickness gradually decreases from the edge areas at two sides to the central area, the arc top of the tile-shaped coating is downward, and the opening is upward;
(4) Starting an induction heating device, and heating the coating together with the pipeline at 80 ℃ for 30min;
(5) After the heat treatment of the pipeline is finished and cooled, preparing a coating on the inner wall of the residual semi-circumference pipeline according to the same method, and heating the coating together with the pipeline at 80 ℃ for 30min again;
(6) And after the heat treatment of the pipeline is finished and the pipeline is cooled, dismantling the induction heating related device.
The coatings prepared in this example were subjected to performance testing in the same manner as in example 1.
The weight change rate of the coating prepared in this example before and after the coating abrasion test does not exceed 1/5 of the weight change rate of the base material (carbon steel) of the pipe, the weight change rate of the coating before and after the coating abrasion test does not exceed 1/9 of the weight change rate of the base material (carbon steel), the weight change rate of the coating before and after the coating abrasion test does not exceed 1/3 of the weight change rate of the base material (carbon steel), and the weight change rate of the coating before and after the coating oxidation test does not exceed 1/3 of the weight change rate of the base material (carbon steel) under the same initial calculated mass.
Example 5
(1) Uniformly mixing composite carbide (WC-Ni: cr 3C2 -NiCr=3:1), composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:4) and composite metal powder (Fe: cr: al=1:1:3) with epoxy resin glue according to a mass ratio of 40:1 to prepare a coating composition;
(2) Cleaning impurities such as greasy dirt and dust on the surface of the pipeline by adopting a hard pipeline brush, and uniformly arranging heat insulation cotton of an induction heating wire device on the outer surface of the pipeline;
(3) Coating the coating composition on the inner wall of a pipeline to form a tile-shaped coating with the thickness of the coating in the central area of 1.0mm, wherein the thickness of the edge areas at two sides of the tile-shaped coating is 2 times that of the central area, the coating thickness gradually decreases from the edge areas at two sides to the central area, the arc top of the tile-shaped coating is downward, and the opening is upward;
(4) Starting an induction heating device, and heating the coating and the pipeline at 100 ℃ for 15min;
(5) After the heat treatment of the pipeline is finished and cooled, preparing a coating on the inner wall of the residual semi-circumference pipeline according to the same method, and heating the coating and the pipeline at 100 ℃ for 15min again;
(6) And after the heat treatment of the pipeline is finished and the pipeline is cooled, dismantling the induction heating related device.
The coatings prepared in this example were subjected to performance testing in the same manner as in example 1.
Under the same initial calculated mass, the weight change rate of the coating prepared in the embodiment before and after the abrasion test does not exceed 1/5 of the weight change rate of the base material (304 stainless steel) of the pipe, the weight change rate of the coating before and after the abrasion test does not exceed 1/7 of the weight change rate of the base material (304 stainless steel), the weight change rate of the coating before and after the abrasion test does not exceed 1/2 of the weight change rate of the base material (304 stainless steel), and the weight change rate of the coating before and after the oxidation test does not exceed 2/3 of the weight change rate of the base material (304 stainless steel).
Comparative example 1
The preparation method of comparative example 1 was the same as in example 1, except that no composite metal powder was added to the composite powder, i.e., the composition was composed of composite carbide (WC-Ni: cr 3C2 -ni=3:1) and composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:5) in a mass ratio of 20:5.
The coatings prepared in this comparative example were subjected to performance testing in the same manner as in example 1. The coating prepared in this comparative example showed a slight decrease in corrosion resistance, an increase in oxidation rate, and the appearance of microcracks, abrasion resistance and erosion resistance comparable to the coating prepared in example 1.
Comparative example 2
The preparation method of comparative example 2 was the same as in example 1, except that no composite oxide was added to the composite powder, i.e., the composition was composed of composite carbide (WC-Ni: cr 3C2 -ni=3:1) and composite metal powder (Fe: cr: al=1:1:3) in a mass ratio of 20:5.
The coatings prepared in this comparative example were subjected to performance testing in the same manner as in example 1. The coating prepared in this comparative example had reduced abrasion resistance, increased oxidation rate, and abrasion and erosion resistance comparable to the coating prepared in example 1.
Comparative example 3
The preparation method of comparative example 3 is the same as in example 1, except that the composition of the composite powder is: composite carbide (WC-Ni: cr 3C2 -ni=3:1), composite oxide (ZrO 2:Cr2O3:Al2O3 =1:1:5) and composite metal powder (Fe: cr: al=1:1:3) in a mass ratio of 26:2:2
The coatings prepared in this comparative example were subjected to performance testing in the same manner as in example 1. The coatings prepared in this comparative example, while slightly degraded in various properties, did not differ significantly from the overall properties of the example 1 coating.
In the present disclosure, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (10)
1. The coating composition is characterized by comprising composite powder and a binder, wherein the composite powder comprises composite carbide, composite oxide and composite metal powder in a mass ratio of (10-20): (3-5), and the composite carbide is WC-Co/Ni/NiCr and Cr 3C2 -Co/Ni/NiCr in a mass ratio of (2-3): 1; the mass ratio of the ZrO 2、Cr2O3 and Al 2O3 is 1:1 (3-5); the mass ratio of the composite metal powder to Fe, cr and Al is 1:1 (2-3); the binder comprises at least one of epoxy resin glue, polyurethane resin glue, silica sol, aluminum sol, tin-based brazing filler metal and zinc-based brazing filler metal.
2. The coating composition according to claim 1, wherein the mass ratio of the composite powder to the binder is (20-50): 1.
3. Use of a coating composition according to claim 1 or 2 in a scour-resistant corrosion-resistant coating.
4. A method for preparing a scour-resistant and corrosion-resistant coating, comprising the steps of:
(1) An induction heating device and heat insulation cotton are arranged on the outer surface of the pipeline;
(2) Applying the coating composition of claim 1 or 2 to a pipe inner wall half circle, and activating the induction heating device to heat;
(3) And (3) preparing a coating on the inner wall of the residual semi-circumference pipeline by adopting the same method as the step (2) after the pipeline is cooled, and dismantling the induction heating device after the pipeline is cooled.
5. The method of claim 4, wherein in the step (2), the heating temperature does not exceed the use temperature of the binder, and the heating time is 2-30 min.
6. The method of producing a erosion resistant coating according to claim 4, wherein in the step (2), the coating composition has a coating thickness of 0.5 to 1.5mm.
7. The method of producing a erosion resistant coating according to claim 6, wherein in step (2), the coating composition is applied to a semicircle of the inner wall of the pipe to form a tile-like coating, and the coating thickness of the tile-like coating is gradually decreased from both side edge regions to the center region.
8. The method for preparing the anti-scouring and anti-corrosion coating according to claim 7, wherein the thickness of the edge areas on two sides of the tile-shaped coating is 1.5-2 times that of the central area.
9. The method of preparing a erosion resistant coating according to claim 7, wherein the tile-shaped coating is arc topped down and open up.
10. The method of producing a erosion resistant coating according to claim 4, wherein the step (1) is preceded by removing impurities from the inner wall surface of the pipe.
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| JP2001152307A (en) * | 1999-11-29 | 2001-06-05 | Nippon Steel Hardfacing Co Ltd | Method of forming corrosion resisting combined coating standing long use, and member having the composite coating |
| CN103962548A (en) * | 2014-05-12 | 2014-08-06 | 西安热工研究院有限公司 | Coating material with abrasion-resistant and cavitation-damage-prevention functions and preparation method thereof |
| CN108893695A (en) * | 2018-06-27 | 2018-11-27 | 水利部杭州机械设计研究所 | The nano-carbide enhancing tungsten carbide-base composite powder of anti-cavitation Anti-erosion a kind of, coating and preparation method thereof |
| CN115160835A (en) * | 2022-07-27 | 2022-10-11 | 西安热工研究院有限公司 | Micro-nano multi-scale anti-coking and anti-wear coating, composite material and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4166977B2 (en) * | 2001-12-17 | 2008-10-15 | 三菱重工業株式会社 | High temperature corrosion resistant alloy material, thermal barrier coating material, turbine member, and gas turbine |
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| JP2001152307A (en) * | 1999-11-29 | 2001-06-05 | Nippon Steel Hardfacing Co Ltd | Method of forming corrosion resisting combined coating standing long use, and member having the composite coating |
| CN103962548A (en) * | 2014-05-12 | 2014-08-06 | 西安热工研究院有限公司 | Coating material with abrasion-resistant and cavitation-damage-prevention functions and preparation method thereof |
| CN108893695A (en) * | 2018-06-27 | 2018-11-27 | 水利部杭州机械设计研究所 | The nano-carbide enhancing tungsten carbide-base composite powder of anti-cavitation Anti-erosion a kind of, coating and preparation method thereof |
| CN115160835A (en) * | 2022-07-27 | 2022-10-11 | 西安热工研究院有限公司 | Micro-nano multi-scale anti-coking and anti-wear coating, composite material and preparation method thereof |
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