CN114836708B - Anti-impact corrosion-resistant amorphous alloy coating with double-layer structure and preparation method thereof - Google Patents
Anti-impact corrosion-resistant amorphous alloy coating with double-layer structure and preparation method thereof Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 195
- 229910000808 amorphous metal alloy Inorganic materials 0.000 title claims abstract description 88
- 230000007797 corrosion Effects 0.000 title claims abstract description 54
- 238000005260 corrosion Methods 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 230000009977 dual effect Effects 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 37
- 239000000843 powder Substances 0.000 claims description 25
- 238000010285 flame spraying Methods 0.000 claims description 22
- 238000005507 spraying Methods 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000001294 propane Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 9
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
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- 238000002485 combustion reaction Methods 0.000 claims description 2
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- 238000010286 high velocity air fuel Methods 0.000 description 11
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
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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
- C23C4/129—Flame 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
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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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Abstract
The invention discloses an anti-impact corrosion-resistant amorphous alloy coating with a double-layer structure and a preparation method thereof, and belongs to the technical field of surface engineering. The inner layer structure of the amorphous alloy coating with the double-layer structure is compact, so that corrosive medium can be prevented from penetrating into a base material, and the corrosion resistance is excellent; the porous structure of the outer layer can absorb more impact energy, reduce the plastic deformation of the matrix, and also can decompose the main crack into a plurality of crack branches, so that stress concentration is avoided, and the penetrating crack of the coating is prevented; has dual functions of impact resistance and corrosion resistance.
Description
Technical Field
The invention relates to the technical field of surface engineering, in particular to an anti-impact corrosion-resistant amorphous alloy coating with a double-layer structure and a preparation method thereof.
Background
The amorphous alloy has the structural characteristics of short-range ordered long-range disorder, so that the amorphous alloy has a plurality of excellent performances of high strength, high hardness, high wear resistance, high corrosion resistance and the like. Among them, high corrosion resistance is one of the most interesting properties, and is mainly due to the following two reasons: firstly, sensitive positions such as dislocation, grain boundary and the like which are easy to preferentially corrode are greatly reduced or even eliminated in the amorphous alloy; secondly, a large amount of solid solution corrosion-resistant components can be formed in the amorphous alloy, a stable passivation film is easy to form, and the etching point generates metastable structure characteristics in the late stage of sprouting so that the etching point is easy to be passivated again. However, bulk amorphous alloys are difficult to apply as structural materials due to limitations in terms of the size and intrinsic brittleness of the formed materials. In recent years, the amorphous alloy coating is applied to the surface of a member as an amorphous alloy coating, and the wear resistance and corrosion resistance of the member are fully exerted. The amorphous alloy coating is successfully applied or has a wide application prospect in the fields of petrochemical industry, electric power, ocean industry, nuclear industry and the like.
For special component surface coatings of special service environments, such as protective coatings of decks on surfaces of ships, the requirements on the performance of the special component surface coatings are severe. Not only is it required to have excellent corrosion resistance, but it is also required to have impact resistance against occasional intermittent impact loads. However, impact resistance is a great challenge for intrinsically brittle amorphous alloys. Improving the impact resistance of amorphous alloy coatings and maintaining the excellent corrosion resistance thereof has been a challenge to be solved. In recent years, attempts have been made to improve the impact resistance of amorphous alloy coatings. For example, by adopting a composite layered structure design of an amorphous alloy coating and a nickel-based alloy coating, the introduction of a tough nickel base layer can effectively improve the impact resistance of the coating, but the electrochemical properties of the added nickel-based coating and the amorphous alloy have great difference, and the galvanic corrosion tendency of the composite coating is serious, so that the corrosion performance of the coating is reduced. For another example, attempts have been made to prepare composite coatings by adding high melting point brittle ceramic particles during the coating preparation process, wherein the cracking of the ceramic particles during the impact process can absorb a portion of the impact energy, thereby reducing crack propagation and significantly improving the impact resistance of the coating. However, the addition of ceramic particles greatly increases the heterointerfaces, which promote penetration of the corrosive medium into the coating in a long-term corrosive environment, thus also reducing the corrosion resistance of the coating.
In summary, the high corrosion resistance of amorphous alloy coatings requires that the coatings have a uniform structure, while impact resistant coatings require the incorporation of heterostructures, which often adversely affect the corrosion resistance of the coatings. Therefore, the design of a novel amorphous alloy coating with high corrosion resistance and impact resistance has important significance for promoting the application of some special environments of the amorphous alloy coating.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an anti-impact corrosion-resistant amorphous alloy coating with a double-layer structure and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an anti-impact corrosion-resistant amorphous alloy coating with a double-layer structure is of an inner-outer double-layer structure, wherein the inner layer is a compact layer with low porosity, and the outer layer is a porous loose layer; the amorphous alloy coating has dual functions of impact resistance and corrosion resistance.
In the amorphous alloy coating, the alloy components of the inner layer and the outer layer are completely the same, and the amorphous alloy coating has an amorphous structure, so that the galvanic corrosion possibly occurring in corrosive media is reduced or even eliminated.
The inner layer structure of the amorphous alloy coating with the double-layer structure is compact, can prevent corrosive medium from penetrating into a base material, and has excellent corrosion resistance.
The porous structure of the outer layer of the amorphous alloy coating with the double-layer structure can absorb more impact energy and reduce the plastic deformation of a matrix; the porous structure of the outer layer can also decompose the tip of the main crack into a plurality of crack branches, so that stress concentration is avoided, the coating is prevented from penetrating the crack, and the anti-shock performance is good.
The inner dense layer of the amorphous alloy coating with the double-layer structure is prepared by adopting a supersonic flame spraying method, and the outer loose layer can be prepared by adopting supersonic flame spraying methods with different technological parameters, and can also be obtained by adopting other spraying methods such as plasma spraying, flame spraying and the like.
The process for preparing the inner compact layer by adopting a supersonic flame spraying (High Velocity Air Fuel, HVAF) method comprises the following steps: heating, melting and spraying amorphous alloy powder with the granularity ranging from 18 mu m to 45 mu m on the surface of a substrate or a component to obtain an inner layer of the amorphous alloy coating; in the HVAF supersonic flame spraying method, propane is used as fuel gas, compressed air is used as combustion improver, and hydrogen and nitrogen are used to improve the flexibility of the process.
The process conditions for preparing the inner layer by adopting the HVAF supersonic flame spraying method are as follows: the air pressure is 80-85 psi; the pressure of the fuel gas is 76-81 psi; propane flow rate: 120-130 SLPM; hydrogen flow rate: 25-28 SLPM; nitrogen flow rate: 25-28 SLPM; powder feeding rate: 20-40 g/min; spraying distance: 200-350 mm.
The process for preparing the outer loose layer by adopting the supersonic flame spraying (HVAF) method of the conversion process comprises the following steps: and heating, melting and spraying amorphous alloy powder with the granularity ranging from 45 mu m to 53 mu m on the surface of the prepared inner layer to obtain the amorphous alloy coating with the double-layer structure.
The technological conditions for preparing the outer layer by adopting the HVAF supersonic flame spraying method are as follows: the air pressure is 85-90 psi; the pressure of the fuel gas is 82-87 psi; propane flow rate: 125-135 SLPM; hydrogen flow rate: 28-30 SLPM; nitrogen flow rate: 28-30 SLPM; powder feeding rate: 40-60 g/min; spraying distance: 180-220 mm.
The amorphous alloy coating is an iron-based amorphous alloy coating, a nickel-based amorphous alloy coating, an aluminum-based amorphous alloy coating and the like; the inner layer has a porosity lower than 0.4% and the outer layer has a porosity higher than 1.0%.
The invention has the following beneficial effects:
(1) The amorphous alloy coating with the double-layer structure of the same component has obviously improved impact resistance compared with a single-layer amorphous alloy coating. The single-layer amorphous alloy coating has penetrating cracks when the impact energy is 10.8 kJ; and the amorphous alloy coating with the double-layer structure still has penetration cracks when the impact energy is 21.6 kJ.
(2) The amorphous alloy coating with the double-layer structure of the same component still has excellent corrosion resistance after impact test. The single-layer amorphous alloy coating has penetrating cracks after impact, so that the matrix material is rapidly dissolved; the amorphous alloy coating with the double-layer structure still has an obvious passivation area after impact test and has excellent corrosion performance.
Drawings
FIG. 1 is a schematic diagram of an amorphous alloy coating with a same-component double-layer structure according to the invention.
FIG. 2 is an X-ray diffraction (XRD) pattern of the inner and outer layers of the amorphous alloy coating of example 1 of the present invention.
FIG. 3 is a Scanning Electron Microscope (SEM) photograph of a single-layer structure coating layer and a double-layer structure coating layer in example 1 of the present invention; in the figure: (a) SEM photograph of a single-layer structure coating template section, (b) SEM photograph of a double-layer structure coating template section, (c) partially enlarged SEM photograph of a porous layer of an outer layer of the double-layer structure coating template, (d) partially enlarged SEM photograph of a dense layer of an inner layer of the double-layer structure coating template.
FIG. 4 is a three-dimensional structural representation of an X-ray three-dimensional imaging system (XRT) of the single layer structured coating and the double layer structured coating of example 1; wherein: (a) a single layer structured coating; (b) a bilayer structured coating.
FIG. 5 is a photograph showing the cross-sectional morphology of the single-layer structured coating and the double-layer structured coating of example 1 after impact test; wherein: (a) and (b) are morphology photographs after impact of the coating with a single layer structure, and (c) and (d) are morphology photographs after impact of the coating with a double layer structure.
FIG. 6 is a three-dimensional topography of the single layer structured coating of example 1 after 21.6J impact energy impact test.
FIG. 7 is a three-dimensional topography of the bilayer coating of example 1 after 21.6J impact energy impact testing.
FIG. 8 is a potentiodynamic polarization curve of the single layer structured coating and the double layer structured coating of example 1 in 3.5wt.% NaCl solution.
FIG. 9 is a potentiodynamic polarization curve in 3.5wt.% NaCl solution after impact testing of the single-layer structured coating and the double-layer structured coating of example 1.
FIG. 10 is a three-dimensional structural representation of an X-ray three-dimensional imaging system (XRT) of the single layer structured coating and the double layer structured coating of example 2; wherein: (a) a single layer structured coating; (b) a bilayer structured coating.
FIG. 11 is a three-dimensional reconstruction of the single-layer and double-layer iron-based amorphous coating of example 2 by X-ray diffraction after impact with an impact energy of 21.6J; wherein: (a) and (b) are coatings with single-layer structures; (c) and (d) are bilayer structured coatings.
Detailed Description
The present invention is further illustrated in detail below with reference to the drawings and examples, which are intended to facilitate an understanding of the present invention and are not to be construed as limiting the invention in any way.
The invention provides an anti-impact corrosion-resistant amorphous alloy coating with a double-layer structure and a preparation method thereof, wherein the alloy components of the inner layer and the outer layer of the coating with the double-layer structure are completely the same and all have amorphous structures, so that the occurrence of galvanic corrosion can be effectively reduced; the inner layer is a compact layer with low porosity, so that corrosive medium is prevented from penetrating into the base material and high corrosion resistance is ensured; the outer layer is a porous loose layer, and the porous structure can absorb more impact energy and reduce plastic deformation of the matrix; the main crack can be decomposed into a plurality of crack branches, so that stress concentration is avoided. The double-layer coating has the dual functions of impact resistance and corrosion resistance.
According to the anti-impact corrosion-resistant amorphous alloy coating with the double-layer structure and the preparation method, the alloy components of the inner layer and the outer layer are completely the same, and the amorphous alloy coating has an amorphous structure, so that galvanic corrosion possibly occurring in a corrosive medium can be effectively reduced or even eliminated, and the corrosion resistance is improved.
According to the anti-impact corrosion-resistant amorphous alloy coating with the double-layer structure and the preparation method, the inner compact layer is prepared by adopting a supersonic flame spraying method, the outer loose layer can be prepared by adopting a supersonic flame spraying method with different technological parameters, and the amorphous alloy coating can also be obtained by adopting other spraying methods such as plasma spraying, flame spraying and the like.
According to the anti-impact corrosion-resistant amorphous alloy coating with the double-layer structure and the preparation method, the inner layer structure of the amorphous alloy coating with the double-layer structure is compact, so that corrosive mediums can be prevented from penetrating into a base material, and the anti-impact corrosion-resistant amorphous alloy coating has excellent corrosion resistance.
According to the anti-impact corrosion-resistant amorphous alloy coating with the double-layer structure and the preparation method thereof, the porous structure of the outer layer of the amorphous alloy coating with the double-layer structure can absorb more impact energy, and the plastic deformation of a matrix is reduced; the porous structure of the outer layer can also decompose the tip of the main crack into a plurality of crack branches, so that stress concentration is avoided, and the coating is prevented from penetrating cracks; has good impact resistance.
After a great deal of experimental researches, the prepared coating has excellent impact resistance and more excellent corrosion performance after impact compared with the amorphous alloy coating with a single-layer structure when the amorphous alloy coating with the double-layer structure and the preparation method are adopted.
Example 1:
in this embodiment, plain carbon steel is selected as the substrate material, and the spray material is selected from Fe-based amorphous alloy 50 Cr 18.0 Mo 7.5 Ni 3.5 P 12 B 3.0 C 3.5 Si 2.5 (atomic ratio); firstly, preparing master alloy according to the chemical formula, and then preparing the iron-based amorphous alloy powder by utilizing an ultrasonic gas atomization method. Sieving the obtained powder to obtain powder with particle size range of 18 ultra-high<45 μm powder and 45% to the whole<The 53 μm powder was used to spray the inner and outer layers of the bilayer structured coating, respectively. The thickness of the inner layer coating of the designed double-layer structure coating is about 220 mu m, and the thickness of the outer layer coating is about 80 mu m, and the schematic diagram of the double-layer structure coating is shown in figure 1.
The inner layer of the double-layer structure coating is prepared by adopting a supersonic flame spraying (High Velocity Air Fuel, HVAF) technology, alloy powder with the granularity ranging from 18 to <45 mu m is heated and melted or partially melted and sprayed on a carbon steel substrate to prepare the iron-based amorphous alloy coating template. The spraying process conditions are as follows: air pressure 82psi; the gas pressure is 78psi; propane flow rate: 125SLPM; hydrogen flow rate: 25SLPM; nitrogen flow rate: 25SLPM; powder feeding rate: 30g/min; spraying distance: 220mm.
In the spraying process, two identical carbon steel substrates are selected, wherein the thickness of a coating sprayed on one substrate is about 300 mu m, and the coating is a single-layer structure coating and is used as a comparison material for subsequent microstructure analysis and performance test. The spraying was stopped when the other substrate was sprayed with a coating thickness of about 220 μm. The template is used for preparing a coating outer layer with a subsequent double-layer structure.
The outer layer of the double-layer structure coating is still prepared by adopting an HVAF supersonic flame spraying technology, alloy powder with the granularity ranging from 45 to 53 mu m is heated and melted or partially melted and sprayed to the template, and when the thickness of the outer layer coating is about 80 mu m, the spraying is stopped to prepare the double-layer structure iron-based amorphous alloy coating template. The outer coating spraying process conditions are as follows: air pressure 88psi; the gas pressure is 85psi; propane flow rate: 132SLPM; hydrogen flow rate: 28SLPM; nitrogen flow rate: 28SLPM; powder feeding rate: 60g/min; spraying distance: 200mm.
The XRD pattern of the iron-based amorphous alloy coating with a single-layer structure and a double-layer structure prepared by the method is shown in figure 2. It can be seen that no obvious crystal diffraction peak is seen in XRD patterns of the inner layer and the outer layer of the single-layer structure coating and the double-layer structure coating, which indicates that the single-layer structure coating and the double-layer structure coating are of completely amorphous structures.
The SEM pictures of the cross sections of the iron-based amorphous alloy coating with the single-layer structure and the double-layer structure prepared by the method are shown in figure 3, and the coating with the single-layer structure can be seen to be compact and uniform in structure and lower in porosity. The inner layer of the coating with the double-layer structure is similar to the coating with the single-layer structure, and only has a few pores with small size; the outer layer has pores with larger size, and the overall porosity of the coating is higher.
The X-ray diffraction three-dimensional reconstruction pictures of the iron-based amorphous alloy coating with the single-layer structure and the double-layer structure prepared by the method are shown in figure 4, and the pictures in the figure can clearly show that the coating with the single-layer structure has lower porosity, the equivalent diameter of most pores is less than 5 mu m, and the pore volume fraction of the whole coating is 0.05 percent. The outer layer of the coating with the double-layer structure has more macropores with equivalent diameter larger than 10 mu m, the whole pore volume fraction of the coating is 0.45%, and the porosity of the coating with the double-layer structure is increased by 8 times compared with that of the coating with the single-layer structure.
The cross-sectional morphology of the iron-based amorphous alloy coating with the single-layer structure and the double-layer structure after impact is shown in fig. 5, and it can be seen that all conical cracks are initiated by the coating/substrate interface and then spread to the surface of the coating. For a single-layer structure coating, the crack growth is longer, and when the impact energy is 10.8J, the crack tip is close to the surface of the coating; whereas at an impact energy of 21.6J, the crack had propagated to the surface of the coating. For the coating with a double-layer structure, deflection occurs in the crack propagation process, and a plurality of crack branches occur at the crack tip; at impact energies of 10.8J and 21.6J, neither crack propagates to the coating surface.
The three-dimensional X-ray diffraction reconstruction of the iron-based amorphous coating with a single-layer structure and a double-layer structure after being impacted by 21.6J impact energy is shown in fig. 6 and 7 respectively. It is clear from the overall three-dimensional topography of fig. 5 (fig. 6 a) and the cross-sectional views of the different cross-sections (fig. 6 f-h) that the crack propagates to the coating surface after impact of the single layer structure coating. Whereas for a bilayer coating, as can be seen from the overall three-dimensional topography of fig. 6 (fig. 7 a) and the cross-sectional views of the different cross-sections (fig. 7 f-h), the bilayer coating crack segments terminate in the porous outer layer and the cracks do not propagate to the coating surface. It can be seen that the bilayer structure coating has more excellent impact resistance.
The electrokinetic polarization curves of the single-layer structure and the double-layer structure iron-based amorphous coating are shown in fig. 8, and it can be seen that the corrosion potentials of the single-layer structure coating and the double-layer structure coating are not obviously different, the two coatings are obviously passivated, and the passivation area is stable. The passivation current density of the double-layer coating is slightly larger than that of the single-layer coating in the high potential area, probably due to the fact that the porosity of the outer layer of the double-layer coating is higher and the area actually participating in the electrochemical reaction is slightly larger.
The electrokinetic polarization curves of the samples of the single-layer structure and the double-layer structure iron-based amorphous coating after being impacted by the impact energy of 21.6J are shown in figure 9, and the corrosion potential of the single-layer structure coating after being impacted is slightly lower than that of the double-layer structure coating; the single layer coating does not have a stable passivation region when the polarization potential reaches 0.3V SCE When the anode current density of the coating is increased by more than an order of magnitude, the coating loses the corrosion protection function. And after the coating with a double-layer structure is impacted, the coating still has a stable passivation area, which shows that the coating has excellent corrosion resistance.
Example 2:
in the embodiment, common carbon steel is used as the substrate material, and the spraying material is iron-based amorphous alloy Fe 49.7 Cr 18.0 Mo 7.4 Mn 1.9 W 1.6 B 15.2 C 3.8 Si 2.4 And (atomic ratio) preparing master alloy by proportioning according to the chemical formula, and preparing the iron-based amorphous alloy powder by using an ultrasonic gas atomization method. Sieving the obtained powder, and selecting granuleThe range of the degree is 18 to ultra<45 μm powder and 45% to the whole<The 53 μm powder was used to spray the inner and outer layers of the bilayer structured coating, respectively. The thickness of the inner layer of the designed coating with the double-layer structure is about 180 mu m, and the thickness of the outer layer of the coating is about 120 mu m.
The inner layer of the coating with the double-layer structure is prepared by adopting alloy powder with the granularity range of 18 to 45 mu m and adopting an HVAF supersonic flame spraying method. The spraying process conditions are as follows: air pressure 85psi; the gas pressure is 81psi; propane flow rate: 128SLPM; hydrogen flow rate: 26SLPM; nitrogen flow rate: 26SLPM; powder feeding rate: 2.5rpm; spraying distance: 260mm.
The outer layer of the coating with the double-layer structure is prepared by adopting alloy powder with the granularity ranging from 45 to 53 mu m and utilizing an HVAF supersonic flame spraying technology. The outer coating spraying process conditions are as follows: air pressure 90psi; the gas pressure is 87psi; propane flow rate: 135SLPM; hydrogen flow rate: 30SLPM; nitrogen flow rate: 30SLPM; powder feeding rate: 5rpm; spraying distance: 180mm.
The XRD patterns of the single-layer structure coating and the double-layer structure coating prepared by the method show that the single-layer structure coating and the double-layer structure coating are both amorphous structure composite structures with less nanocrystalline.
The X-ray diffraction three-dimensional reconstruction pictures of the single-layer structure and double-layer structure iron-based amorphous alloy coating prepared by the method are shown in figure 10, and the single-layer structure coating has smaller pore size and lower porosity, and the whole pore volume fraction of the coating is 0.12%. The outer layer of the coating with the double-layer structure is provided with more macropores, and the whole pore volume fraction of the coating is 0.45%.
The three-dimensional X-ray diffraction reconstruction of the iron-based amorphous coating with the single-layer structure and the double-layer structure obtained by the method after being impacted by the impact energy of 21.6J is shown in figure 11. From the longitudinal sectional view of the two coatings and the three-dimensional reconstruction of the complete crack in the figures, it can be seen that the crack has propagated to the surface of the coating after impact of the single-layer coating. The crack section of the coating with the double-layer structure is terminated at the porous outer layer, the crack does not propagate to the surface of the coating, and no penetrating crack is formed. It can be seen that the bilayer structure coating has more excellent impact resistance.
The electrokinetic polarization curve of the sample of the iron-based amorphous coating with the single-layer structure and the double-layer structure, which is impacted by the impact energy of 21.6J, also shows that: the single-layer structure coating has no obvious passivation area after impact, and the anode current density is rapidly increased along with the potential increase, so that the coating has lost the corrosion protection function. And the passivation area is stable after the coating with the double-layer structure is impacted, and the coating still has excellent corrosion resistance.
In conclusion, the analysis shows that the iron-based amorphous coating with the double-layer structure has dual functions of impact resistance and corrosion resistance, and particularly has good corrosion protection performance after impact; and the single-layer amorphous alloy coating can form a penetrating crack after being impacted, and the coating loses the original corrosion protection function.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (3)
1. An anti-impact corrosion-resistant amorphous alloy coating with a double-layer structure is characterized in that: the amorphous alloy coating has an inner layer and an outer layer, the inner layer is a compact layer with low porosity, and the outer layer is a porous loose layer; the amorphous alloy coating has dual functions of impact resistance and corrosion resistance;
in the amorphous alloy coating, the alloy components of the inner layer and the outer layer are completely the same, and the amorphous alloy coating has an amorphous structure, so that the galvanic corrosion of the amorphous alloy coating in a corrosive medium is reduced;
the amorphous alloy coating is an iron-based amorphous alloy coating, a nickel-based amorphous alloy coating or an aluminum-based amorphous alloy coating; the inner layer has a porosity lower than 0.3% and the outer layer has a porosity higher than 1.0%;
the inner compact layer of the anti-impact corrosion-resistant amorphous alloy coating with the double-layer structure is prepared by adopting a supersonic flame spraying method, and the outer loose layer of the amorphous alloy coating with the double-layer structure is prepared by adopting a supersonic flame spraying method with different technological parameters;
the process for preparing the inner compact layer by adopting the supersonic flame spraying method comprises the following steps: heating, melting and spraying amorphous alloy powder with the granularity of 18-45 mu m on the surface of a substrate or a component to obtain an inner layer of an amorphous alloy coating; in the supersonic flame spraying method, propane is used as fuel gas, compressed air is used as combustion improver, and hydrogen and nitrogen are used to improve the flexibility of the process;
the process conditions for preparing the inner layer by adopting the supersonic flame spraying method are as follows: the air pressure is 80-85 psi; the pressure of the fuel gas is 76-81 psi; propane flow rate: 120-130 SLPM; hydrogen flow rate: 25-26 SLPM; nitrogen flow rate: 25-26 SLPM; powder feeding rate: 20-40 g/min; spraying distance: 200-350 mm;
the process for preparing the outer loose layer by adopting the supersonic flame spraying method comprises the following steps: heating, melting and spraying amorphous alloy powder with the granularity of 45-53 mu m on the surface of the prepared inner layer to obtain an amorphous alloy coating with a double-layer structure;
the technological conditions for preparing the outer layer by adopting the supersonic flame spraying method are as follows: air pressure is 88-90 psi; the pressure of the fuel gas is 82-87 psi; propane flow rate: 125-135 SLPM; hydrogen flow rate: 28-30 SLPM; nitrogen flow rate: 28-30 SLPM; powder feeding rate: 40-60 g/min; spraying distance: 180-220 mm.
2. The impact-resistant corrosion-resistant bilayer structure amorphous alloy coating according to claim 1, wherein: the inner layer structure of the amorphous alloy coating with the double-layer structure is compact, can prevent corrosive medium from penetrating into a base material, and has excellent corrosion resistance.
3. The impact-resistant corrosion-resistant bilayer structure amorphous alloy coating according to claim 1, wherein: the porous structure of the outer layer of the amorphous alloy coating with the double-layer structure can absorb impact energy and reduce plastic deformation of a matrix; the porous structure of the outer layer enables the tip of the main crack to be decomposed into a plurality of crack branches, avoids stress concentration, prevents the coating from penetrating cracks, and has good shock resistance.
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| RU2015123046A (en) * | 2015-06-17 | 2017-01-10 | Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королёва" (ОАО "РКК "Энергия") | GLASS WITH OPTICALLY TRANSPARENT PROTECTIVE COATING AND METHOD FOR ITS MANUFACTURE |
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| CN111910159A (en) * | 2020-08-10 | 2020-11-10 | 株洲华锐精密工具股份有限公司 | Nanocrystalline amorphous composite coating, preparation method thereof and cutter |
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| RU2015123046A (en) * | 2015-06-17 | 2017-01-10 | Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королёва" (ОАО "РКК "Энергия") | GLASS WITH OPTICALLY TRANSPARENT PROTECTIVE COATING AND METHOD FOR ITS MANUFACTURE |
| CN106835132A (en) * | 2016-12-25 | 2017-06-13 | 仇颖莹 | A kind of preparation method of double-layer high-strength corrosion resistant iron base amorphous composite coating |
| CN111910159A (en) * | 2020-08-10 | 2020-11-10 | 株洲华锐精密工具股份有限公司 | Nanocrystalline amorphous composite coating, preparation method thereof and cutter |
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