CN115488331A - Cold spraying powder for outer barrel of landing gear and spraying method applying powder - Google Patents
Cold spraying powder for outer barrel of landing gear and spraying method applying powder Download PDFInfo
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- CN115488331A CN115488331A CN202211049143.2A CN202211049143A CN115488331A CN 115488331 A CN115488331 A CN 115488331A CN 202211049143 A CN202211049143 A CN 202211049143A CN 115488331 A CN115488331 A CN 115488331A
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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
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Abstract
The invention relates to cold spraying powder for an outer cylinder of an undercarriage and a spraying method using the cold spraying powder 2 O 3 The powder is prepared according to the following steps of Ni: al: zn: al (Al) 2 O 3 The mass ratio of = 3. 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 size of cold spraying equipment is small, the movement is convenient, open fire is avoided in the construction process, and inflammable and explosive gases are not used, so that the requirement on the working environment is low, and the invention is suitable for construction in various complex environments.
Description
Technical Field
The invention relates to the field of spraying processing, in particular to cold spraying powder for an outer cylinder of an undercarriage and a spraying method applying the powder.
Background
The landing gear device is a key load-bearing structural component of the aircraft, and is an extremely important mission in the safe taking-off and landing process of the aircraft. In order to resist the ultrahigh load in the taking-off and landing and turning processes of the airplane, the landing gear device is made of ultrahigh-strength steel commonly, and meanwhile, a combined damping structure of a landing gear piston rod and an outer landing gear barrel is adopted. Ultra-high strength steels tend to be very sensitive to corrosion fatigue and stress corrosion cracking. Therefore, when the aircraft is manufactured, the surfaces of the landing gear parts need to be protected by certain coating layers, such as cadmium plating layers.
Cadmium is a heavy nonferrous metal element, the toxicity of cadmium is high, air and food polluted by cadmium seriously harm human bodies, and the cadmium is slowly metabolized in the human bodies. Although the cadmium layer prepared by the cadmium electroplating process has the advantages of few pores and high corrosion resistance, the tendency of hydrogen embrittlement is high, and the hydrogen embrittlement harmfulness is great for ultrahigh-strength steel parts such as landing gear outer cylinders, and the safety of taking off and landing of airplanes is seriously threatened. In addition, the outer cylinder of the landing gear of a modern aircraft has the overall dimension of more than 1 meter, and parts with the dimensions have high requirements on the dimension of an electroplating bath and are greatly restricted by construction environments.
The cold spraying technology is an important remanufacturing and repairing technical 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 operate in an open area, the restriction of the size of the part is small, and the cold spraying technology is suitable for preparing the surface anticorrosive coatings of large-size parts such as the outer cylinder of the aircraft landing gear.
The invention of CN202010712636.4 & lt & gt landing gear outer cylinder cold spraying remanufacturing process & gt describes a cold spraying preparation method of a zinc coating on the surface of a landing gear outer cylinder, and the invention has the following differences compared with the prior art: (1) different coating materials and different spraying processes; (2) The invention relates to a cold spray zinc coating, which aims to realize the repair of local damage of an original zinc layer.
Disclosure of Invention
In order to solve the technical problems, the invention provides cold spraying powder for an outer cylinder of a landing gear and a spraying method using the powder. The invention aims to solve the problems of high environmental pollution, large hydrogen embrittlement damage and high requirements on construction operation sites of the original cadmium plating layer of the outer cylinder of the landing gear of the airplane, and adopts a cold spraying technology to prepare a nickel-aluminum-zinc coating on the surface of the outer cylinder of the landing gear so as to meet the requirements of the outer cylinder of the landing gear on corrosion resistance;
the technical problem to be solved by the invention is realized by adopting the following technical scheme:
a cold-sprayed powder for the external cylinder of landing gear is prepared from Ni powder, al powder, zn powder and Al powder 2 O 3 The powder is prepared according to the following steps of Ni: al: zn: al (Al) 2 O 3 The mass ratio of = 3.
The purity of the Ni powder is more than 99.7 percent, the purity of the Al powder is more than 99.6 percent, the purity of the Zn powder is more than 99.7 percent, and the Al powder is 2 O 3 The purity of the powder is more than 92 percent.
A landing gear outer barrel spraying method comprises the following steps:
the first step is as follows: protecting the surface of the outer barrel of the undercarriage without a spraying area, and clamping by using a tool;
the second step: cleaning the outer barrel of the landing gear by using acetone, then performing sand blasting treatment on a region to be sprayed, and finally cleaning the region to be sprayed to remove pollutants, wherein the surface roughness of the region to be sprayed is Ra6.0-Ra8.0 after sand blasting;
the third step: cold spraying powder is filled into low-pressure cold spraying equipment, and is sprayed on a region to be sprayed on the outer barrel surface of the undercarriage to form a nickel-aluminum-zinc coating, 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 ℃;
the fourth step: checking whether the thickness of the nickel-aluminum-zinc coating meets the requirement after spraying and whether the outer cylinder of the landing gear meets the design requirement, and if not, removing the coating by using sand paper or a grinding tool;
the fifth step: inspecting the spraying area of the outer cylinder of the landing gear, and coating and protecting the outer cylinder of the landing gear;
and a sixth step: preparing a sample piece according to the process, and carrying out microstructure analysis, hardness analysis, bonding strength analysis, corrosion resistance analysis and self-corrosion analysis on the sample piece.
The processing technological parameters in the third step 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; spraying angle: 90 ° ± 20 °; spraying line speed: 20 mm/s-200 mm/s.
In the fifth step, the surface of the coating is inspected in a visual inspection mode, and the coating has no crack, warping, peeling or falling-off phenomenon; extracting parts or using an equivalent test piece, and lightly tapping with an aluminum hammer of 200g to check the bonding strength of the coating, wherein the coating does not fall off; and spraying TB06-9 primer or other coatings specified by the process on the surface within 24 hours after spraying for coating protection.
In the sixth step, after the sample piece is prepared, the following method is adopted for analysis:
the first step is as follows: observing and analyzing the microstructure performance of the coating by adopting a metallographic detection method and by means of a scanning electron microscope;
the second step is that: the Vickers microhardness of the coating is evaluated according to the standard of GB/T9790 Vickers and Nurse microhardness test of metal materials and other inorganic coatings;
the third step: evaluating the bonding strength of the coating according to the standard GB/T8642 determination of the tensile bonding strength of the thermal spraying;
the fourth step: and (4) evaluating the neutral salt spray resistance of the coating by referring to the standard GB/T10125-2012 salt spray test for artificial atmosphere corrosion test. According to the requirement of HB5362, namely the examination of corrosion resistance quality of metal protective layers commonly used for airplanes, the coating should not generate red corrosion products after a 360-hour neutral salt spray test.
The fifth step: and respectively testing Tafel curves of the nickel-aluminum-zinc coating and the traditional cadmium-plated layer by referring to GB/T24196-2009 'guide rule for measuring constant potential and electrokinetic potential polarization of metal and alloy corrosion electrochemical test methods'.
In the fifth step, the test was carried out in a 3.5% NaCl solution using a Pt electrode as an auxiliary electrode and a calomel electrode as a reference electrode, and at a current range of-2A to 2A.
The beneficial effects of the invention are: 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 cold spraying equipment is small, the cold spraying equipment is convenient to move, open fire does not exist in the construction process, and inflammable and explosive gas is not used, so that the requirement on the working environment is low, and the cold spraying device 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 outer cylinder surface of the landing gear is greatly improved;
4. the average hardness of the nickel-aluminum-zinc coating reaches 126HV, which is higher than pure metal layers such as pure Al, pure Zn, pure Cd and the like, and the wear resistance is better.
5. The nickel-aluminum-zinc coating has the bonding strength of more than 40MPa, stronger anti-stripping capability and longer service life.
6. Salt spray tests prove that the corrosion resistance of the sample piece is not inferior to that of the original design of the electroplated cadmium layer, and the corrosion resistance requirement of the outer cylinder of the landing gear on the coating is met.
7. The electrochemical test result shows that the nickel-aluminum-zinc coating is generally similar to the electrochemical performance of the cadmium plating layer, and cannot cause great influence on other parts related to the landing gear outer cylinder, the self-corrosion potential of the novel coating is slightly lower than that of the cadmium plating layer, the self-corrosion current density is slightly higher than that of the cadmium plating layer, and the novel coating is used as a sacrificial anode and has relatively better cathode protection effect on a substrate.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a micro-topography of a cold spray powder of the present invention;
FIG. 2 is a graph of the particle size distribution of the cold spray powder of the present invention;
FIG. 3 is a photograph of the microstructure of the Ni-Al-Zn coating according to the present invention;
FIG. 4 is a scanning electron microscope image of the Ni-Al-Zn coating according to the present invention;
FIG. 5 shows the electrochemical performance test results of the nickel-aluminum-zinc coating of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be described more clearly and more completely with reference to the drawings in the following embodiments, and it is understood that the described embodiments are only a part of the present invention, rather than all of the present invention, and based on the embodiments, other embodiments obtained by those skilled in the art without inventive exercise are within the protection scope of the present invention.
A cold-sprayed powder for the external cylinder of landing gear is prepared from Ni powder, al powder, zn powder and Al powder 2 O 3 The powder is prepared according to the following steps of Ni: al: zn: al (Al) 2 O 3 1, the mass ratio of the powder is that the powder is prepared by uniformly mixing the components through mechanical stirring, and the spraying is completed within 2 hours after the stirring is completed; after 2 hours, the powder can be layered and have uneven components, which affects the final spraying effect.
The purity of the Ni powder is more than 99.7 percent, the purity of the Al powder is more than 99.6 percent, the purity of the Zn powder is more than 99.7 percent, and the Al powder is 2 O 3 The purity of the powder is more than 92 percent.
The self-corrosion potential of the common cold spraying anti-corrosion functional coating (such as a pure aluminum coating and a pure zinc coating) is larger than that of the electroplated cadmium layerThe difference. Therefore, in order to reduce the influence of changing the design of the outer cylinder anticorrosive coating of the landing gear on other related parts, the corrosion resistance of the newly designed coating needs to be ensured to be as close as possible to the self-corrosion potential on the basis of not being inferior to that of the original cadmium-plated coating. For this reason, the main component of the cold spraying powder is Al powder with a purity of more than 99.6%, and a small amount of Zn powder with a purity of more than 99.7% is added, but the bonding strength of the low-pressure cold spraying Al coating can only reach 10MPa due to the relatively large deformation difficulty of the pure Al powder. Al addition is commonly adopted in cold spraying industry 2 O 3 The powder form increases the bond strength of the coating, but this approach again reduces the corrosion resistance of the coating. In the design research of the components of the thermal spraying and laser cladding coating, the Ni element is commonly used for improving the wear resistance and the corrosion resistance of the coating, and can be used for reducing the oxide content of the TiC-Ni metal ceramic coating. Considering that the Ni element has good corrosion resistance and good toughness and plasticity, can be deformed fully in the cold spraying process, fills the powder particle gaps caused by poor deformation capability of Al powder, and improves the density of the coating. Meanwhile, the Ni powder is fully deformed to enable the coating to be more tightly combined with the matrix, and the bonding strength of a novel coating taking Al powder as a main component is improved, so that the Ni powder with a certain proportion of purity more than 99.7 percent 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 percent is added on the premise of not reducing the corrosion resistance of the coating 2 O 3 And (3) powder. According to the weight ratio of Ni: al: zn: al (aluminum) 2 O 3 The mass ratio of = 3. Wherein, al and Zn can provide good corrosion resistance, and Ni powder can improve the bonding performance of the coating and the matrix while providing the corrosion resistance. Small amount of Al 2 O 3 The powder can improve the surface hardness of the coating and reduce the risk of abrasion 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 spraying method comprises the following steps:
the first step is as follows: protecting the surface of the outer barrel of the landing gear without a spraying area, and clamping by using a tool; protecting the area, which does not need to be sprayed, on the surface of the outer cylinder of the landing gear by adopting a special high-temperature-resistant protective adhesive tape for spraying;
the second step is that: cleaning the outer cylinder of the landing gear by using acetone to remove various oil stains and impurities, then performing sand blasting treatment on a region to be sprayed, wherein the surface roughness of the region to be sprayed is Ra6.0-Ra8.0 after sand blasting, and finally cleaning the region to be sprayed to remove pollutants; the whole outer barrel of the landing gear is swept by compressed air, so that attachment of sand grains and floating ash is prevented, and pollutants can be removed by using a clean brush in a local area;
the third step: cold spraying powder is filled into low-pressure cold spraying equipment, and is sprayed on a region to be sprayed on the outer barrel surface of the undercarriage to form a nickel-aluminum-zinc coating, 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 ℃;
the fourth step: checking whether the thickness of the nickel-aluminum-zinc coating meets the requirement after spraying and whether the outer cylinder of the landing gear meets the design requirement, and if not, removing the coating by using sand paper or a grinding tool;
the fifth step: inspecting the spraying area of the outer cylinder of the landing gear, and coating and protecting the outer cylinder of the landing gear;
and a sixth step: preparing a sample piece according to the process, and carrying out microstructure analysis, hardness analysis, bonding strength analysis, corrosion resistance analysis and self-corrosion analysis on the sample piece.
The processing technological parameters in the third step are as follows: spraying pressure: 170psi to 190psi; 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; spraying angle: 90 ° ± 20 °; spraying line speed: 20 mm/s-200 mm/s.
The coating quality and the proper coating deposition efficiency can be ensured through the process, when the process range is exceeded, the condition that the coating deposition efficiency is too low can occur, but the pores and the bonding strength of the coating cannot be changed clearly, and if the process is deviated too much, the coating cannot be deposited; maximum deposition efficiencyIs 2cm 3 Min, the deposition efficiency is only about 50% of the maximum after the process is out of range.
In the fifth step, the surface of the coating is inspected in a visual inspection mode, and the coating has no crack, warpage, peeling or falling-off phenomenon; extracting parts or using an equivalent test piece, and lightly tapping with an aluminum hammer of 200g to check the bonding strength of the coating, wherein the coating does not fall off; and spraying TB06-9 primer or other coating specified by the process on the surface within 24 hours after spraying for coating protection.
In the sixth step, after the sample piece is prepared, the following method is adopted for analysis:
the first step is as follows: observing and analyzing the microstructure performance of the coating by adopting a metallographic detection method and by means of a scanning electron microscope;
the second step is that: the Vickers microhardness of the coating is evaluated according to the GB/T9790 Vickers and Nurse microhardness test standard of metal materials and metal and other inorganic coatings;
the third step: evaluating the bonding strength of the coating according to the GB/T8642 'determination of tensile bonding strength of thermal spraying';
the fourth step: and (4) 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 requirement of HB5362 "Corrosion resistance quality inspection of metal protective layer commonly used for airplane", the coating should not generate red corrosion products after 360h neutral salt spray test.
The fifth step: the Tafel curves of the nickel-aluminum-zinc coating and the traditional cadmium-plated layer are respectively tested by referring to GB/T24196-2009 'constant potential and potentiodynamic polarization measurement guide rule of metal and alloy corrosion electrochemical test method'.
Evaluation combining the above test results shows that the coating microstructure is uniform and dense, 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 outer cylinder of the landing gear, the combination strength reaches more than 40MPa, and the combination performance is obviously superior to that of the traditional cold spraying anticorrosion functional coating (the combination strength of a pure aluminum coating is generally 10MPa, and the combination strength of a pure zinc coating is generally 30 MPa), and is also far higher than that of a cadmium-plated layer (10 MPa). After 360-hour neutral salt spray test, the coating has no red corrosion products on the surface, and meets the corrosion prevention requirement of the outer cylinder of the landing gear on the coating.
As shown in FIG. 5, the electrochemical test results showed that the self-corrosion potential of the original cadmium plating layer was-0.987V and the self-corrosion current density was-3.16X 10 6 A/cm 2 . The self-corrosion potential of the cold spraying 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 nickel-aluminum-zinc coating and the cadmium-plated layer have close electrochemical performances, the manufacturing process and components of the landing gear outer cylinder anticorrosive layer are changed, the landing gear outer cylinder related other parts cannot be greatly influenced, the self-corrosion potential of the nickel-aluminum-zinc coating is slightly lower than that of the cadmium-plated layer, the self-corrosion current density of the nickel-aluminum-zinc coating is slightly higher than that of the cadmium-plated layer, and the nickel-aluminum-zinc coating is used as a sacrificial anode and has relatively better cathode protection effect on a substrate.
In the fifth step, the test was carried out in a 3.5% NaCl solution using a Pt electrode as an auxiliary electrode and a calomel electrode as a reference electrode, and at a current range of-2A to 2A.
The foregoing shows and describes the general principles, essential 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, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The cold spraying powder for the outer cylinder of the landing gear is characterized in that: the cold spray powder is prepared by mixing Ni powder, al powder, zn powder, and Al 2 O 3 The powder is prepared according to the following steps of Ni: al: zn: al (Al) 2 O 3 The mass ratio of = 3.
2. A landing gear outer barrel cold spray powder according to claim 1, wherein: purity of the Ni powderMore than 99.7 percent of Al powder, more than 99.6 percent of Al powder, more than 99.7 percent of Zn powder and Al 2 O 3 The purity of the powder is more than 92 percent.
3. A method for spraying an outer cylinder of an undercarriage is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: protecting the surface of the outer barrel of the undercarriage without a spraying area, and clamping by using a tool;
the second step is that: cleaning the outer cylinder of the landing gear by using acetone, then carrying out sand blasting treatment on a region to be sprayed, and finally cleaning the region to be sprayed to remove pollutants, wherein the surface roughness of the region to be sprayed is Ra6.0-Ra8.0 after sand blasting;
the third step: cold spraying powder is filled into low-pressure cold spraying equipment and sprayed on the to-be-sprayed area on the outer cylinder surface of the landing gear to form a nickel-aluminum-zinc coating, the surface temperature of the 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 ℃;
the fourth step: checking whether the thickness of the nickel-aluminum-zinc coating meets the requirement after spraying and whether the outer cylinder of the landing gear meets the design requirement, and if not, removing the coating by using sand paper or a grinding tool;
the fifth step: inspecting the spraying area of the outer cylinder of the landing gear, and coating and protecting the outer cylinder of the landing gear;
and a sixth step: preparing a sample piece according to the process, and carrying out microstructure analysis, hardness analysis, bonding strength analysis, corrosion resistance analysis and self-corrosion analysis on the sample piece.
4. The landing gear outer cylinder surface spraying method according to claim 1, wherein: the processing technological parameters in the third step are as follows: spraying pressure: 170psi to 190psi; 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; spraying angle: 90 ° ± 20 °; spraying line speed: 20 mm/s-200 mm/s.
5. The landing gear outer cylinder surface spraying method according to claim 1, wherein: in the fifth step, the surface of the coating is inspected in a visual inspection mode, and the coating has no crack, warpage, peeling or falling-off phenomenon; extracting parts or using an equivalent test piece, and lightly tapping with an aluminum hammer of 200g to check the bonding strength of the coating, wherein the coating does not fall off; and spraying TB06-9 primer or other coating specified by the process on the surface within 24 hours after spraying for coating protection.
6. The landing gear outer cylinder surface spraying method according to claim 1, characterized in that: in the sixth step, after the sample piece is prepared, the following method is adopted for analysis:
the first step is as follows: observing and analyzing the microstructure performance of the coating by adopting a metallographic detection method and by means of a scanning electron microscope;
the second step is that: the Vickers microhardness of the coating is evaluated according to the GB/T9790 Vickers and Nurse microhardness test standard of metal materials and metal and other inorganic coatings;
the third step: evaluating the bonding strength of the coating according to the GB/T8642 'determination of tensile bonding strength of thermal spraying';
the fourth step: and (4) evaluating the neutral salt spray resistance of the coating by referring to the standard GB/T10125-2012 salt spray test for artificial atmosphere corrosion test. According to the requirement of HB5362, namely the examination of corrosion resistance quality of metal protective layers commonly used for airplanes, the coating should not generate red corrosion products after a 360-hour neutral salt spray test.
The fifth step: the Tafel curves of the nickel-aluminum-zinc coating and the traditional cadmium-plated layer are respectively tested by referring to GB/T24196-2009 'constant potential and potentiodynamic polarization measurement guide rule of metal and alloy corrosion electrochemical test method'.
7. The landing gear outer cylinder surface spraying method according to claim 6, wherein: the fifth step was carried out in 3.5% NaCl solution, using Pt electrode as auxiliary electrode and calomel electrode as reference electrode, at a current range of-2A to 2A.
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| CN106567027A (en) * | 2016-10-31 | 2017-04-19 | 邯郸学院 | Metal pipeline nickel-based composite corrosion-resistant coating and preparation method thereof |
| CN109136828A (en) * | 2018-09-27 | 2019-01-04 | 中国人民解放军陆军装甲兵学院 | A kind of Zn-Al-Ni anti-corrosion function infiltration layer preparation method |
| 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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