A device and processing method for efficiently preparing double anti-corrosion alloy

Abstract

The present invention provides a device and a processing method for efficiently preparing a double anti-corrosion alloy, comprising a reaction chamber, a high-voltage power supply, a laser system and a nitrogen supply system, wherein a substrate is placed in the reaction chamber, and aluminum powder is evenly spread on the surface of the substrate; the nitrogen supply system fills the reaction chamber with nitrogen; the negative electrode of the high-voltage power supply is connected to one side of the reaction chamber where the substrate is placed, and the positive electrode of the high-voltage power supply is connected to the opposite side of the reaction chamber where the substrate is placed, so as to form an electric field perpendicular to the surface of the substrate and separate nitrogen into nitrogen ions; the laser system performs laser impact on the surface of the substrate, and the present invention forms not only an AlN deposition coating on the surface of the substrate through thermal-mechanical coupling, but also refines the grains inside the substrate to form a strain-strengthening layer, thereby performing a double anti-corrosion treatment on the surface of the substrate.

Description

Technical Field

[0001] The invention relates to the field of metal surface processing, and in particular to a device and a processing method for efficiently preparing a double anti-corrosion alloy. Background Art

[0002] Aluminum alloy has the advantages of low density, good plasticity and corrosion resistance. It is widely used in many industrial fields and has important research and application value. Although alloy materials have good corrosion resistance in a variety of environments, the Cl- contained in harsh environments such as seawater and marine atmosphere will cause the alloy itself to become thinner, reduce strength, and sometimes cause local perforation or fracture, and even structural damage, which restricts its further application and development. However, with the development of industrialization, the complex and harsh service environment has put forward higher requirements for aluminum alloys, so it is very necessary to adopt appropriate surface protection methods. Laser shock produces plastic deformation on the surface of the substrate, introduces residual pressure, and induces the formation of a strain-hardened layer. At the same time, AlN coating has the characteristics of high strength, low density and corrosion resistance. However, the conventional preparation of AlN coating is to use aluminum oxide and carbon to sinter at high temperature in a N2 environment or directly nitride metal aluminum to prepare. This method is easy to introduce carbon or aluminum oxide impurities, and it is not easy to be used in combination with the substrate. Another method is physical or chemical vapor deposition, which generally uses a magnetron sputtering process to directly prepare an Al / AlN coating on a substrate. This method can prepare a pure and dense Al / AlN coating, but its deposition efficiency is low and it is difficult to deposit a thick coating, which will reduce the performance of the Al / AlN material. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an apparatus and processing method for efficiently preparing a dual-anticorrosion alloy. First, nitrogen is filled into a reaction chamber and an electric field is used to separate nitrogen into nitrogen ions. Then, a laser system is used to perform laser shock on a substrate with aluminum powder on the surface to form a strain-hardened layer on the alloy surface. At the same time, the thermal effect generated by the laser shock causes the aluminum powder to reach a molten state and react with nitrogen ions to form an AlN deposition coating on the substrate surface. With only one step of laser shock, not only an AlN deposition coating is formed on the substrate surface through thermal coupling, but also the grains inside the substrate are refined to form a strain-hardened layer, and the substrate surface is subjected to dual anticorrosion treatment.

[0004] The present invention achieves the above technical objectives through the following technical means.

[0005] A device for efficiently preparing a double anti-corrosion alloy comprises a reaction chamber, a high-voltage power supply, a powder feeding device, a laser system and a nitrogen supply system, wherein a substrate is placed in the reaction chamber, the powder feeding device is used to lay aluminum powder on the surface of the substrate; the nitrogen supply system is used to fill the reaction chamber with nitrogen; the negative electrode of the high-voltage power supply is connected to the substrate, the positive electrode of the high-voltage power supply is connected to the top of the reaction chamber, and the high-voltage power supply is used to ionize nitrogen into nitrogen ions by forming an electric field perpendicular to the surface of the substrate; the laser system is used to form a strain-strengthening layer and an AlN deposition coating on the surface of the substrate by laser impacting the surface of the substrate.

[0006] Furthermore, a waste gas recovery device is provided outside the reaction chamber, and the waste gas recovery device is connected to the gas outlet of the reaction chamber and is used to recover the waste gas in the reaction chamber.

[0007] Furthermore, the nitrogen supply system includes a nitrogen bottle and an N2 ring. The nitrogen bottle is connected to the gas inlet of the reaction chamber and is used to fill the reaction chamber with nitrogen; the N2 ring is located above the surface of the substrate and is used to increase the nitrogen ion concentration near the substrate.

[0008] Furthermore, the N2 ring is a hollow ring, one end of which is connected to a nitrogen bottle, and a plurality of injection holes are provided on the hollow ring, and the injection holes are aimed at the surface of the substrate to increase the nitrogen ion concentration near the upper surface of the substrate.

[0009] Furthermore, the laser system comprises a nanosecond flat-top laser, a reflector and a focusing mirror, and the laser light emitted by the nanosecond flat-top laser is focused on the surface of the substrate through the reflector and the focusing mirror.

[0010] Furthermore, a three-axis processing platform is provided in the reaction chamber, and the substrate is placed on the three-axis processing platform.

[0011] A method for efficiently preparing a dual-anticorrosion alloy device comprises the following steps:

[0012] Placing a substrate in a reaction chamber; evenly spreading aluminum powder on the surface of the substrate;

[0013] The reaction chamber is evacuated and nitrogen is filled into the reaction chamber at the same time;

[0014] The nitrogen gas is ionized into nitrogen ions by setting an electric field perpendicular to the surface of the substrate in the reaction chamber;

[0015] Laser shock is performed on the surface of the substrate to form a strengthened strain layer and an AlN deposition coating on the surface of the substrate.

[0016] Furthermore, the thickness of the AlN coating was adjusted by adjusting the N2 concentration and the content of aluminum powder.

[0017] The beneficial effects of the present invention are:

[0018] 1. The device and processing method for efficiently preparing a dual-corrosion-resistant alloy described in the present invention utilize laser shock to perform dual-corrosion protection on the alloy surface. Through only one step of laser shock, not only an AlN deposition coating is formed on the substrate surface through thermal coupling, but also the grains inside the substrate are refined to form a strain-hardened layer, thereby performing dual-corrosion protection on the substrate surface and effectively reducing the processing cost.

[0019] 2. The device and processing method for efficiently preparing dual corrosion-resistant alloys described in the present invention can be applied to different metal materials, have strong stability and a wide range of applications.

[0020] 3. The device and processing method for efficiently preparing dual-corrosion-resistant alloys described in the present invention provide a three-axis processing platform in the reaction chamber, and place the substrate on the three-axis processing platform, which can perform dual-corrosion protection on parts with more complex shapes.

[0021] 4. The device and processing method for efficiently preparing dual corrosion-resistant alloys described in the present invention use a hollow stainless steel ring as the N2 ring, and the air outlet holes on the inner side of the ring are evenly distributed, which is used to increase the nitrogen ion concentration around the substrate and improve the deposition reaction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the device for efficiently preparing dual corrosion-resistant alloys according to the present invention.

[0024] In the figure:

[0025] 1-computer; 2-high voltage power supply; 3-three-dimensional information collector; 4-reflector; 5-nanosecond flat-top laser; 6-nitrogen bottle; 7-focusing mirror; 8-N2 ring; 9-aluminum powder; 10-substrate; 11-three-axis processing platform; 12-motion controller; 13-waste gas recovery device; 14-reaction chamber; 15-nitrogen ions. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 As shown, the device for efficiently preparing dual anti-corrosion alloys described in the present invention includes a reaction chamber 14, a high-voltage power supply 2, a powder feeding device, a laser system and a nitrogen supply system. A three-axis processing platform 11 is provided in the reaction chamber 14, and a substrate 10 is placed on the three-axis processing platform 11 for adjusting the position of the substrate 10; the powder feeding device is used to lay aluminum powder 9 on the surface of the substrate 10; the positive and negative poles of the high-voltage power supply 2 are respectively connected to the two sides of the reaction chamber 14, the negative pole of the high-voltage power supply 2 is connected to the side of the reaction chamber 14 where the substrate 10 is placed, and the positive pole of the high-voltage power supply 2 is connected to the opposite side of the reaction chamber 14 where the substrate is placed. By virtue of such a connection, an electric field perpendicular to the surface of the substrate 10 can be formed in the reaction chamber 14.

[0031] The nitrogen supply system includes a nitrogen bottle 6 and an N2 ring 8. The nitrogen bottle 6 is connected to the air inlet of the reaction chamber 14 to fill the reaction chamber 14 with nitrogen. The nitrogen is ionized into nitrogen ions 15 under the action of the electric field in the reaction chamber 14. The nitrogen ions 15 at the positive electrode move toward the negative electrode of the electric field and can be adsorbed on the surface of the substrate at the negative electrode. During the laser shock, they can react with the aluminum powder that is melted by the thermal effect of the laser shock. The N2 ring 8 is a hollow stainless steel ring, and a plurality of side air outlet holes are evenly arranged on the ring body. The N2 ring 8 is arranged near the surface of the substrate 10 in the reaction chamber 14 and is connected to the nitrogen bottle 6 through a pipeline to increase the nitrogen ion concentration around the surface of the substrate 10 and improve the reaction rate.

[0032] The laser system comprises a nanosecond flat-top laser 5, a reflector 4 and a focusing mirror 7. The stress wave induced by the nanosecond flat-top laser 5 mainly propagates longitudinally, the surface morphology after treatment is flat, and the residual stress field inside the substrate 10 is more uniform. The laser emitted by the nanosecond flat-top laser 5 is reflected by the reflector 4 and focused by the focusing mirror 7 to irradiate the surface of the substrate 10, and the surface of the substrate 10 is laser-shocked. The laser shock forms plastic deformation on the surface of the substrate 10, induces internal grain refinement and introduces residual compressive stress. At the same time, the thermal effect generated by the laser shock promotes the aluminum powder 9 and the nitrogen ions 15 to form an AlN deposition coating on the surface of the substrate 10. Only one step of laser shock is performed, and through thermal-mechanical coupling, not only an AlN deposition coating is generated on the surface of the substrate 10, but also the internal grains of the substrate 10 are refined and a strain-strengthening layer is generated on the surface of the substrate 10.

[0033] The device for efficiently preparing dual anti-corrosion alloys described in the present invention also includes a control system, which is a computer 1, and the computer 1 is connected to and controls a high-voltage power supply 2 and a laser system; the computer 1 is also connected to a three-axis processing platform 11 through a motion controller 12, and can control the three-axis processing platform 11 to complete the dual anti-corrosion treatment of relatively complex parts; an N2 nitrogen concentration sensor is installed in the reaction chamber 14, and the N2 nitrogen concentration sensor is located near the upper surface of the substrate. The computer 1 determines whether to connect the nitrogen bottle 6 with the N2 ring 8 according to the detection value of the N2 nitrogen concentration sensor. The computer 1 adjusts the nitrogen concentration in the reaction chamber 14 and the content of the aluminum powder 9 laid on the surface of the substrate 10 to adjust the thickness of the AlN deposition coating; in addition, the computer 1 is also externally connected to a three-dimensional information acquisition machine 3 for detecting the deposition of the AlN deposition coating on the surface of the substrate 10. An exhaust gas recovery device 13 is provided outside the reaction chamber 14, and the exhaust gas recovery device 13 is connected to the gas outlet of the reaction chamber 14 to recover the exhaust gas in the reaction chamber 14.

[0034] The processing method of the device for efficiently preparing a dual anti-corrosion alloy according to the present invention comprises the following steps:

[0035] A substrate 10 with a sample size of 40 mm×40 mm×5 mm was polished flat with sandpaper and placed in anhydrous ethanol. The surface of the substrate was cleaned with ultrasonic waves and then clamped on a three-axis processing platform 11 in a reaction chamber 14 .

[0036] Aluminum powder 9 is evenly spread on the surface of the substrate 10, and the aluminum powder is used as an absorption layer;

[0037] The reaction chamber 14 is evacuated and filled with nitrogen through the nitrogen bottle 6. The evacuation and nitrogen filling process needs to be repeated several times to reduce the content of other impurities in the reaction chamber 14, thereby effectively reducing the content of pollutants in the AlN deposited coating.

[0038] The high voltage power supply 2 is started by the control system, and the high voltage power supply 2 forms an electric field perpendicular to the surface of the substrate 10 in the reaction chamber 14 to ionize the nitrogen gas into nitrogen ions 15 .

[0039] The laser system is started by the control system, and the surface of the substrate is subjected to laser shock treatment without a constrained layer. The laser shock forms plastic deformation on the surface of the substrate 10, induces internal grain refinement, introduces residual compressive stress, and forms a strain-hardened layer. At the same time, the thermal effect generated by the laser shock promotes the aluminum powder 9 and the nitrogen ions 15 to form an AlN deposition coating on the surface of the substrate 10. Only one step of laser shock is performed, and through thermal-mechanical coupling, not only an AlN deposition coating is generated on the surface of the substrate 10, but also the internal grains of the substrate 10 are refined and a strain-hardened layer is generated on the surface of the substrate 10.

[0040] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0041] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for efficiently preparing a dual anti-corrosion alloy, characterized in that: The steps include: Placing a substrate (10) in a reaction chamber (14); and evenly spreading aluminum powder (9) on the surface of the substrate (10); The reaction chamber (14) is evacuated and nitrogen is simultaneously filled into the reaction chamber (14); By setting an electric field perpendicular to the surface of the substrate (10) in the reaction chamber (14), the nitrogen gas is ionized into nitrogen ions (15); Performing laser shock on the surface of the substrate (10) so as to form a strengthened strain layer and an AlN deposition coating on the surface of the substrate (10); The device for preparing the dual corrosion-resistant alloy comprises a reaction chamber (14), a high-voltage power supply (2), a powder feeding device, a laser system and a nitrogen supply system. A substrate (10) is placed in the reaction chamber (14). The powder feeding device is used to lay aluminum powder (9) on the surface of the substrate (10). The nitrogen supply system is used to fill the reaction chamber (14) with nitrogen. The negative electrode of the high-voltage power supply (2) is connected to the substrate (10), and the positive electrode of the high-voltage power supply (2) is connected to the top of the reaction chamber (14). The high-voltage power supply (2) is used to ionize nitrogen into nitrogen ions (15) by forming an electric field perpendicular to the surface of the substrate (10). The laser system is used to form a strain-hardened layer and an AlN deposition coating on the surface of the substrate (10) by laser impacting the surface of the substrate (10).

2. The method for efficiently preparing a dual anti-corrosion alloy according to claim 1, characterized in that: The thickness of the AlN coating can be adjusted by adjusting the N2 concentration and the content of aluminum powder.

3. The method for efficiently preparing a dual anti-corrosion alloy according to claim 1, characterized in that: An exhaust gas recovery device (13) is provided outside the reaction chamber (14); the exhaust gas recovery device (13) is connected to the exhaust port of the reaction chamber (14) and is used to recover the exhaust gas in the reaction chamber (14).

4. The method for efficiently preparing a dual anti-corrosion alloy according to claim 1, characterized in that: The nitrogen supply system comprises a nitrogen bottle (6) and an N2 ring (8); the nitrogen bottle (6) is connected to the gas inlet of the reaction chamber (14) and is used to fill the reaction chamber (14) with nitrogen; the N2 ring (8) is located above the surface of the substrate (10) and is used to increase the nitrogen ion concentration near the substrate.

5. The method for efficiently preparing a dual anti-corrosion alloy according to claim 4, characterized in that: The N2 ring (8) is a hollow ring, one end of which is connected to a nitrogen bottle (6), and a plurality of injection holes are provided on the hollow ring, the injection holes being aimed at the surface of the substrate (10) and being used to increase the nitrogen ion concentration near the upper surface of the substrate.

6. The method for efficiently preparing a dual anti-corrosion alloy according to claim 1, characterized in that: The laser system comprises a nanosecond flat-top laser (5), a reflector (4) and a focusing mirror (7); laser light emitted by the nanosecond flat-top laser (5) is focused on the surface of a substrate (10) via the reflector (4) and the focusing mirror (7).

7. The method for efficiently preparing a dual anti-corrosion alloy according to claim 1, characterized in that: A three-axis processing platform (11) is provided in the reaction chamber (14), and the substrate (10) is placed on the three-axis processing platform (11).

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