CN115488331B - Landing gear outer cylinder cold spraying powder and spraying method using same - Google Patents
Landing gear outer cylinder cold spraying powder and spraying method using same Download PDFInfo
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- CN115488331B CN115488331B CN202211049143.2A CN202211049143A CN115488331B CN 115488331 B CN115488331 B CN 115488331B CN 202211049143 A CN202211049143 A CN 202211049143A CN 115488331 B CN115488331 B CN 115488331B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/12—Metallic powder containing non-metallic particles
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0036—Matrix based on Al, Mg, Be or alloys thereof
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
Abstract
The invention relates to a landing gear outer cylinder cold spray powder and a spray method using the powder, wherein the cold spray powder comprises Ni powder, al powder, zn powder and Al 2 O 3 Powder according to Ni: al: zn: al (Al) 2 O 3 The mass ratio of =3:5:1:1 was prepared by mechanical stirring and mixing well, and spraying was completed within 2 hours after stirring was completed. The nickel-aluminum-zinc coating adopted by the invention has little environmental pollution, no toxicity and no harm; the invention adopts cold spraying for processing, the cold spraying equipment has small size, convenient movement, no open fire in the construction process and no flammable and explosive gas, thus having less requirements on the working environment and being suitable for construction in various complex environments.
Description
Technical Field
The invention relates to the field of spraying processing, in particular to landing gear outer cylinder cold spraying powder and a spraying method using the powder.
Background
Landing gear assemblies are critical load bearing structural components of an aircraft and are of paramount importance in the safety take-off and landing of the aircraft. In order to resist the ultrahigh load during the taking off, landing gear and turning of an aircraft, the landing gear device is commonly made of ultrahigh-strength steel, and meanwhile, a combined shock absorption structure of a landing gear piston rod and a landing gear outer cylinder is adopted. Ultra-high strength steels tend to be very sensitive to corrosion fatigue and stress corrosion cracking. Therefore, during aircraft manufacturing, the surfaces of landing gear components are protected by a coating, such as an electroplated cadmium layer.
Cadmium is a heavy nonferrous metal element, the toxicity of cadmium is high, and the air and food polluted by cadmium are serious to the human body and are metabolized slowly in the human body. The cadmium layer prepared by the cadmium electroplating process has the advantages of less pores and high corrosion resistance, but has high tendency of generating hydrogen embrittlement, and has extremely high harm to the ultra-high strength steel parts such as landing gear outer cylinder and the like, thereby seriously threatening the safety of taking off and landing of an airplane. In addition, the external dimension of the landing gear outer cylinder of the modern aircraft is more than 1 meter, the dimension requirement of the dimension parts on the electroplating tank is higher, and the limitation of the construction environment is larger.
The cold spraying technology is used as an important remanufacturing and repairing technology means, the heat input in the repairing process is low, the rapid deposition of the light metal material can be realized, the cold spraying technology can be operated in an open area and is little restricted by the size of the part, and the cold spraying technology is suitable for preparing the surface anti-corrosion coating of large-size parts such as an outer cylinder of an aircraft landing gear.
The invention discloses a cold spraying preparation method of a zinc coating on the surface of an outer cylinder of a landing gear in CN202010712636.4, namely a cold spraying remanufacturing process of the outer cylinder of the landing gear, which is characterized in that: (1) different materials of the coating and different spraying processes; (2) The invention discloses novel powder for repairing local damage of an original zinc layer by cold spraying a zinc coating, and adopts the cold spraying coating to replace the original cadmium plating layer.
Disclosure of Invention
In order to solve the technical problems, the invention provides landing gear outer cylinder cold spraying powder and a spraying method using the powder. The invention aims to solve the problems of high environmental pollution, high hydrogen embrittlement hazard and high requirements on construction operation sites of the original electroplated cadmium layer of the outer cylinder of the landing gear of the aircraft, adopts a cold spraying technology to prepare the nickel-aluminum-zinc coating on the surface of the outer cylinder of the landing gear, and meets the requirements of the outer cylinder of the landing gear on corrosion resistance;
the technical problems to be solved by the invention are realized by adopting the following technical scheme:
a cold spray powder for outer cylinder of landing gear is prepared from Ni powder, al powder, zn powder and Al 2 O 3 Powder according to Ni: al: zn: al (Al) 2 O 3 The mass ratio of =3:5:1:1 was prepared by mechanical stirring and mixing well, and spraying was completed within 2 hours after stirring was completed.
The purity of the Ni powder is more than 99.7%, the purity of the Al powder is more than 99.6%, the purity of the Zn powder is more than 99.7%, and the purity of the Al 2 O 3 The purity of the powder is more than 92 percent.
A landing gear outer barrel spray coating method, comprising the steps of:
the first step: protecting the surface of the outer cylinder of the landing gear without spraying areas, and clamping by using a tool;
and a second step of: cleaning the outer cylinder of the landing gear by using acetone, then carrying out sand blasting on the region to be sprayed, wherein the surface roughness of the region to be sprayed after sand blasting is Ra6.0-Ra8.0, and finally cleaning the region to be sprayed to remove pollutants;
and a third step of: cold spraying powder is filled into low-pressure cold spraying equipment, and a nickel-aluminum-zinc coating is formed on the surface to-be-sprayed area of the outer cylinder of the landing gear by spraying, wherein the surface temperature of a part is monitored in real time by an infrared thermometer in the spraying process, and the temperature of a matrix is not higher than 120 ℃;
fourth step: checking whether the thickness of the nickel-aluminum-zinc coating after spraying meets the design requirement or not, and removing the outer cylinder of the landing gear by adopting sand paper or a polishing tool if the thickness of the nickel-aluminum-zinc coating does not exceed the design requirement;
fifth step: checking the spraying area of the outer cylinder of the landing gear, and coating and protecting the outer cylinder of the landing gear;
sixth step: the test piece was prepared according to the above-described process, and microstructure analysis, hardness analysis, bonding strength analysis, corrosion resistance analysis, and self-corrosiveness analysis were performed on the test piece.
The third step of processing technological parameters are as follows: spraying pressure: 170 psi-190 psi; gas heating temperature: 350-450 ℃; process gas: nitrogen with purity not lower than 99.9%; the powder feeding rate is 12 g/min-25 g/min; spraying distance: 15 mm-25 mm; spray angle: 90 ° ± 20 °; spraying linear velocity: 20mm/s to 200mm/s.
In the fifth step, the surface of the coating is checked by adopting a visual inspection mode, and the coating has no phenomena of crack, warpage, peeling or falling; extracting parts or adopting an equivalent test piece, lightly beating with a 200g aluminum hammer to check the bonding strength of the coating, wherein no coating falling phenomenon exists; and (3) spraying a TB06-9 primer or other coatings specified by the process on the outer surface of the paint for coating protection within 24 hours after spraying.
And sixthly, preparing a sample piece, and analyzing by adopting the following method:
the first step: adopting a metallographic detection method, and observing and analyzing the microstructure performance of the coating by means of a scanning electron microscope;
and a second step of: evaluating the vickers microhardness of the coating by referring to the standard of GB/T9790 'vickers and knoop microhardness test of metal materials and other inorganic coating layers';
and a third step of: the bonding strength of the coating is evaluated by referring to GB/T8642 standard of determination of thermal spraying tensile bonding strength;
fourth step: the neutral salt spray resistance of the coating is evaluated by referring to GB/T10125-2012 Standard of salt spray test for Corrosion test of Artificial atmosphere. According to the requirements of HB5362 corrosion-resistant quality inspection of common metal protective layers of airplanes, the coating should not generate red corrosion products after 360h neutral salt spray test.
Fifth step: tafel curves of the nickel aluminum zinc coating and the traditional electroplated cadmium layer are respectively tested by referring to GB/T24196-2009 "constant potential and potentiodynamic polarization measurement guidelines of corrosion electrochemical test methods of metals and alloys".
In the fifth step, in a 3.5% NaCl solution, a Pt electrode is used as an auxiliary electrode, a calomel electrode is used as a reference electrode, and the current range is-2A to 2A.
The beneficial effects of the invention are as follows: 1. the adopted nickel-aluminum-zinc coating has little environmental pollution, no toxicity and no harm;
2. the cold spraying is adopted for processing, the size of the cold spraying equipment is small, the movement is convenient, no open fire exists in the construction process, and flammable and explosive gas is not used, so that the requirements on the working environment are less, and the method is suitable for construction under various complex environments.
3. The porosity of the nickel-aluminum-zinc coating is about 0.3%, the compactness is high, and the corrosion resistance of the surface of the landing gear outer cylinder is greatly improved;
4. the average hardness of the nickel-aluminum-zinc coating reaches 126HV, and is higher than that of pure metal layers such as pure Al, pure Zn, pure Cd and the like, and the wear resistance is better.
5. The bonding strength of the nickel aluminum zinc coating is above 40MPa, the stripping resistance is stronger, and the service life is longer.
6. Salt spray tests prove that the corrosion resistance of the test piece is not inferior to that of the original design of the electroplated cadmium layer, and the corrosion resistance requirement of the landing gear outer cylinder on the coating is met.
7. The electrochemical test result shows that the electrochemical performance of the nickel aluminum zinc coating is generally similar to that of the electroplated cadmium layer, the nickel aluminum zinc coating can not cause great influence on other parts related to the outer cylinder of the landing gear, the self-corrosion potential of the novel coating is slightly lower than that of the electroplated cadmium layer, the self-corrosion current density is slightly higher than that of the electroplated cadmium layer, and the novel coating is used as a sacrificial anode and has relatively better cathodic protection effect on a matrix.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a microscopic topography of a cold spray powder of the present invention;
FIG. 2 is a graph showing the particle size distribution of the cold spray powder of the present invention;
FIG. 3 is a photograph of a microstructure of a nickel aluminum zinc coating of the present invention;
FIG. 4 is a photograph of a scanning electron microscope of a nickel aluminum zinc coating of the present invention;
FIG. 5 shows the results of electrochemical performance test of the nickel aluminum zinc coating of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by a person skilled in the art, the present invention will be more clearly and more fully described below with reference to the accompanying drawings in the embodiments, and of course, the described embodiments are only a part of, but not all of, the present invention, and other embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of the present invention.
A cold spray powder for outer cylinder of landing gear is prepared from Ni powder, al powder, zn powder and Al 2 O 3 Powder according to Ni: al: zn: al (Al) 2 O 3 The mass ratio of (3:5:1:1) is uniformly mixed by mechanical stirring, and spraying is completed within 2 hours after stirring is completed; after more than 2 hours, the powder can delaminate and the composition is uneven, which affects the final spraying effect.
The purity of the Ni powder is more than 99.7%, the purity of the Al powder is more than 99.6%, the purity of the Zn powder is more than 99.7%, and the purity of the Al 2 O 3 The purity of the powder is more than 92 percent.
The self-corrosion potential of common cold spray corrosion-resistant functional coatings (such as pure aluminum coatings and pure zinc coatings) is greatly different from that of electroplated cadmium layers. Therefore, in order to reduce the influence of changing the design of the outer cylinder anti-corrosion layer of the landing gear on other related parts, the anti-corrosion performance of the new design coating is required to be ensured to be as similar as possible on the basis that the anti-corrosion performance of the new design coating is not inferior to that of the original design cadmium plating layer. For this reason, the main component of the cold spray powder adopts Al powder with purity of more than 99.6%, and small amount of Zn powder with purity of more than 99.7% is added, but the bonding strength of the low-pressure cold spray Al coating can only reach 10MPa generally due to the relatively large deformation difficulty of the pure Al powder. The cold spraying industry commonly adopts the addition of Al 2 O 3 The powder form increases the coating bond strength, but this approach reduces the corrosion resistance of the coating. In the design and research of the components of thermal spraying and laser cladding coatings, ni element is commonly used for improving the wear resistance and corrosion resistance of the coatings, and Ni element can be used for reducing the oxide content of TiC-Ni metal ceramic coatings. The Ni element is considered to have good corrosion resistance and good toughness and plasticityAnd in the cold spraying process, the coating can be fully deformed, powder particle gaps caused by poor deformation capability of Al powder are filled, and the coating density is improved. Meanwhile, the full deformation of the Ni powder enables the combination of the coating and the matrix to be tighter, and is favorable for improving the combination strength of the novel coating taking the Al powder as the main component, so that the Ni powder with the purity of more than 99.7% in a certain proportion is added into the cold spraying powder. In order to further improve the surface hardness of the coating and reduce the failure risk of the coating, a small amount of Al with the purity of more than 92% is added on the premise of not reducing the corrosion resistance of the coating 2 O 3 And (3) powder. According to Ni: al: zn: al (Al) 2 O 3 The four ingredients were mixed uniformly by mechanical mixing method, with a mass ratio of =3:5:1:1. Wherein, the two components of Al and Zn can provide good corrosion resistance, and the Ni powder can improve the combination property of the coating and the matrix while providing corrosion resistance. Small amount of Al 2 O 3 The powder can increase the surface hardness of the coating and reduce the risk of wear failure of the coating. The microstructure of the cold spray powder is shown in figure 1, and the particle size distribution is shown in figure 2.
A landing gear outer barrel spray coating method, comprising the steps of:
the first step: protecting the surface of the outer cylinder of the landing gear without spraying areas, and clamping by using a tool; adopting a special high-temperature resistant protective adhesive tape for spraying to protect the area of the surface of the landing gear outer cylinder without spraying;
and a second step of: the outer cylinder of the landing gear is cleaned by acetone to remove various greasy dirt and impurities, then the region to be sprayed is subjected to sand blasting, the surface roughness of the region to be sprayed after sand blasting is Ra6.0-Ra8.0, and finally the region to be sprayed is cleaned to remove the pollutants; the whole outer cylinder of the landing gear is purged by adopting compressed air, so that sand grains and floating ash are prevented from adhering, and a clean brush can be used for removing pollutants in a local area;
and a third step of: cold spraying powder is filled into low-pressure cold spraying equipment, and a nickel-aluminum-zinc coating is formed on the surface to-be-sprayed area of the outer cylinder of the landing gear by spraying, wherein the surface temperature of a part is monitored in real time by an infrared thermometer in the spraying process, and the temperature of a matrix is not higher than 120 ℃;
fourth step: checking whether the thickness of the nickel-aluminum-zinc coating after spraying meets the design requirement or not, and removing the outer cylinder of the landing gear by adopting sand paper or a polishing tool if the thickness of the nickel-aluminum-zinc coating does not exceed the design requirement;
fifth step: checking the spraying area of the outer cylinder of the landing gear, and coating and protecting the outer cylinder of the landing gear;
sixth step: the test piece was prepared according to the above-described process, and microstructure analysis, hardness analysis, bonding strength analysis, corrosion resistance analysis, and self-corrosiveness analysis were performed on the test piece.
The third step of processing technological parameters are as follows: spraying pressure: 170 psi-190 psi; gas heating temperature: 350-450 ℃; process gas: nitrogen with purity not lower than 99.9%; the powder feeding rate is 12 g/min-25 g/min; spraying distance: 15 mm-25 mm; spray angle: 90 ° ± 20 °; spraying linear velocity: 20mm/s to 200mm/s.
The quality and proper deposition efficiency of the coating can be ensured through the process, when the process is beyond the process range, the condition of low deposition efficiency of the coating can occur, but the pores and the bonding strength of the coating do not change in detail, and if the process is deviated too much, the coating can not be deposited; the highest deposition efficiency is 2cm 3 After exceeding the process category, the deposition efficiency is only about 50% of the maximum.
In the fifth step, the surface of the coating is checked by adopting a visual inspection mode, and the coating has no phenomena of crack, warpage, peeling or falling; extracting parts or adopting an equivalent test piece, lightly beating with a 200g aluminum hammer to check the bonding strength of the coating, wherein no coating falling phenomenon exists; and (3) spraying a TB06-9 primer or other coatings specified by the process on the outer surface of the paint for coating protection within 24 hours after spraying.
And sixthly, preparing a sample piece, and analyzing by adopting the following method:
the first step: adopting a metallographic detection method, and observing and analyzing the microstructure performance of the coating by means of a scanning electron microscope;
and a second step of: evaluating the vickers microhardness of the coating by referring to the standard of GB/T9790 'vickers and knoop microhardness test of metal materials and other inorganic coating layers';
and a third step of: the bonding strength of the coating is evaluated by referring to GB/T8642 standard of determination of thermal spraying tensile bonding strength;
fourth step: the neutral salt spray resistance of the coating is evaluated by referring to GB/T10125-2012 Standard of salt spray test for Corrosion test of Artificial atmosphere. According to the requirements of HB5362 corrosion-resistant quality inspection of common metal protective layers of airplanes, the coating should not generate red corrosion products after 360h neutral salt spray test.
Fifth step: tafel curves of the nickel aluminum zinc coating and the traditional electroplated cadmium layer are respectively tested by referring to GB/T24196-2009 "constant potential and potentiodynamic polarization measurement guidelines of corrosion electrochemical test methods of metals and alloys".
The evaluation of the test results shows that the microstructure of the coating is uniform and compact, the porosity is about 0.3% as shown in fig. 3 to 4, and the average hardness reaches 126HV. Meanwhile, the nickel aluminum zinc coating is well combined with the landing gear outer cylinder, the bonding strength reaches more than 40MPa, the bonding performance of the traditional cold spraying anti-corrosion functional coating is obviously better than that of the traditional cold spraying anti-corrosion functional coating (the bonding strength of a pure aluminum coating is generally 10MPa, the bonding strength of a pure zinc coating is generally 30 MPa), and the bonding strength of the pure aluminum coating is also far higher than that of a cadmium plating layer (10 MPa). After the coating is subjected to a 360-hour neutral salt spray test, the surface of the coating has no red corrosion products, and the corrosion resistance requirement of the landing gear outer cylinder on the coating is met.
As shown in FIG. 5, the electrochemical test result shows that the self-corrosion potential of the original designed electroplated cadmium layer is-0.987V, and the self-corrosion current density is-3.16X10 6 A/cm 2 . The self-corrosion potential of the cold spray nickel aluminum zinc composite coating is-1.022V, and the self-corrosion current density is-3.63 multiplied by 10 6 A/cm 2 . The electrochemical performance of the nickel aluminum zinc coating is generally similar to that of the electroplated cadmium layer, the manufacturing process and components of the corrosion-resistant layer of the landing gear outer cylinder are changed, the corrosion-resistant layer of the landing gear outer cylinder cannot cause great influence on other parts related to the landing gear outer cylinder, the self-corrosion potential of the nickel aluminum zinc coating is slightly lower than that of the electroplated cadmium layer, the self-corrosion current density is slightly higher than that of the electroplated cadmium layer, and the self-corrosion current density is relatively better as a sacrificial anode for protecting the cathode of a matrix.
In the fifth step, in a 3.5% NaCl solution, a Pt electrode is used as an auxiliary electrode, a calomel electrode is used as a reference electrode, and the current range is-2A to 2A.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The landing gear outer cylinder cold spray powder is characterized in that: the cold spray powder is prepared by mixing Ni powder, al powder, zn powder, al 2 O 3 Powder according to Ni: al: zn: al (Al) 2 O 3 The mass ratio of (3:5:1:1) is uniformly mixed by mechanical stirring, and spraying is completed within 2 hours after stirring is completed;
the purity of the Ni powder is more than 99.7%, the purity of the Al powder is more than 99.6%, the purity of the Zn powder is more than 99.7%, and the purity of the Al 2 O 3 The purity of the powder is more than 92 percent.
2. A landing gear outer cylinder spraying method using the landing gear outer cylinder cold spraying powder according to claim 1, which is characterized in that: the method comprises the following steps:
the first step: protecting the surface of the outer cylinder of the landing gear without spraying areas, and clamping by using a tool;
and a second step of: cleaning the outer cylinder of the landing gear by using acetone, then carrying out sand blasting treatment on the region to be sprayed, carrying out surface roughness of the region to be sprayed after sand blasting to be Ra6.0-Ra8.0, and finally cleaning the region to be sprayed to remove pollutants;
and a third step of: cold spraying powder is filled into low-pressure cold spraying equipment, and a nickel-aluminum-zinc coating is formed on the surface to-be-sprayed area of the outer cylinder of the landing gear by spraying, wherein the surface temperature of a part is monitored in real time by an infrared thermometer in the spraying process, and the temperature of a matrix is not higher than 120 ℃;
fourth step: checking whether the thickness of the nickel-aluminum-zinc coating after spraying meets the design requirement or not, and if so, removing the outer cylinder of the landing gear by adopting sand paper or a polishing tool;
fifth step: checking the spraying area of the outer cylinder of the landing gear, and coating and protecting the outer cylinder of the landing gear;
sixth step: preparing a sample piece according to the steps, and performing microstructure analysis, hardness analysis, bonding strength analysis, corrosion resistance analysis and self-corrosiveness analysis on the sample piece;
the third step of processing technological parameters are as follows: spraying pressure: 170 psi-190 psi; gas heating temperature: 350-450 ℃; process gas: nitrogen with purity not lower than 99.9%; the powder feeding rate is 12 g/min-25 g/min; spraying distance: 15 mm-25 mm; spray angle: 90 ° ± 20 °; spraying linear velocity: 20mm/s to 200mm/s;
in the fifth step, the surface of the coating is checked by adopting a visual inspection mode, and the coating has no phenomena of crack, warpage, peeling or falling; extracting parts or adopting an equivalent test piece, lightly beating with a 200g aluminum hammer to check the bonding strength of the coating, wherein no coating falling phenomenon exists; and (3) spraying a TB06-9 primer or other coatings specified by the process on the outer surface of the paint for coating protection within 24 hours after spraying.
3. A landing gear outer barrel spraying method according to claim 2, wherein: and sixthly, preparing a sample piece, and analyzing by adopting the following method:
the first step: adopting a metallographic detection method, and observing and analyzing the microstructure performance of the coating by means of a scanning electron microscope;
and a second step of: evaluating the vickers microhardness of the coating by referring to the standard of GB/T9790 'vickers and knoop microhardness test of metal materials and other inorganic coating layers';
and a third step of: the bonding strength of the coating is evaluated by referring to GB/T8642 standard of determination of thermal spraying tensile bonding strength;
fourth step: evaluating the neutral salt spray resistance of the coating according to the standard of GB/T10125-2012 salt spray test for artificial atmosphere corrosion test; according to the requirements of HB5362 corrosion-resistant quality inspection of common metal protective layers of airplanes, the coating should not generate red corrosion products after 360h neutral salt spray test;
fifth step: tafel curves of the nickel aluminum zinc coating and the traditional electroplated cadmium layer are respectively tested by referring to GB/T24196-2009 "constant potential and potentiodynamic polarization measurement guidelines of corrosion electrochemical test methods of metals and alloys".
4. A landing gear outer barrel spray method according to claim 3, wherein: in the fifth step, in a 3.5% NaCl solution, a Pt electrode is used as an auxiliary electrode, a calomel electrode is used as a reference electrode, and the current range is-2A to 2A.
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| WO2021258566A1 (en) * | 2020-06-24 | 2021-12-30 | 浙江工业大学 | Method for preparing anti-cavitation cobalt-based coating based on work-hardening plastic deposition |
| CN111979535A (en) * | 2020-07-22 | 2020-11-24 | 国营芜湖机械厂 | Cold spraying remanufacturing process for outer cylinder surface of undercarriage |
| CN112501605A (en) * | 2020-12-01 | 2021-03-16 | 湖北超卓航空科技股份有限公司 | Preparation method of functional composite cold spray coating |
| CN114318323A (en) * | 2021-12-10 | 2022-04-12 | 国营芜湖机械厂 | Method for repairing local damage of aircraft skin surface in situ through cold spraying |
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