A metal additive friction stir alloying device and surface corrosion resistance modification method

Abstract

The present invention relates to a metal additive stir friction alloying device and a surface corrosion resistance modification method, belonging to the technical field of metal material corrosion protection. The invention solves the problem that the stir friction large plastic processing method derived from the stir friction welding technology usually directly modifies the structure of the material itself and is difficult to add additional elements. The invention comprises a shaft shoulder, a stirring head and a planer component, wherein the lower part of the stirring head is arranged in the shaft shoulder, and the planer component is arranged on the front side of the shaft shoulder. The present invention can adjust the planing depth, the number of planing grooves, the composition of the alloyed filamentary raw materials, etc., and meet the different corrosion resistance modification requirements of various metal plates by adding elements and stirring friction.

Description

Technical Field

[0001] The invention relates to a friction stirring alloy device and a surface modification method, belonging to the technical field of metal material corrosion protection. Background Art

[0002] Aluminum alloys are widely used in aerospace, shipbuilding and other technical fields due to their low density, high specific strength and excellent machinability. Aluminum itself is a highly active element. In a dry air environment, a dense passive oxide film can be formed on the surface of aluminum alloys, which can effectively prevent corrosion and oxidation of aluminum alloys in dry environments. However, in a humid atmosphere, especially in an environment containing depolarized ions such as chloride ions and fluoride ions or strong acid and alkali environments, the oxide film on the surface of aluminum alloys is easy to form a penetrating channel or even completely fall off, and it is difficult to exist stably to protect the internal aluminum alloy from further corrosion. Therefore, the corrosion resistance modification of the aluminum alloy surface has become a key consideration for its reliable service in marine environments or similar harsh environments. The surface corrosion resistance modification of aluminum alloys mainly includes anodizing, spray painting, magnetron sputtering / vapor deposition coating, corrosion-resistant layer deposition surfacing and other means. Among them, the passive oxide film formed by anodizing is difficult to exist stably in a strong acid and alkali environment, while the technical solutions such as painting and coating are often thin, and are easily damaged by external forces in harsh environments, resulting in the loss of corrosion resistance and even inducing severe crevice corrosion. Corrosion-resistant layer deposition is an effective means of corrosion resistance, which can prepare a thicker alloy layer on the surface of the material to resist corrosion problems in various harsh environments. At present, corrosion-resistant layer deposition is usually achieved by melting deposition methods such as arc, plasma beam, and laser. This type of method has the advantages of high deposition efficiency and easy process control, but it also often faces the problems of hydrogen pores, cracks, element segregation, and high residual stress inherent in the melting and resolidification process. There are certain limitations in its application in the corrosion resistance modification of aluminum alloy surfaces.

[0003] The friction stir large plastic processing method derived from the friction stir welding technology is a pure solid phase modification method. In principle, it avoids the intrinsic problems of the melting and resolidification method such as pores, cracks, and element segregation, and also has the advantages of small residual stress and deformation. However, this type of method currently usually directly modifies the material itself (refines the grain and homogenizes it to improve the toughness and formability of the structure), and it is difficult to add additional alloying elements to further improve the corrosion resistance of the material.

[0004] Therefore, it is urgent to propose a metal additive stir friction alloying device and a surface corrosion resistance modification method to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the friction stir large plastic processing method derived from the friction stir welding technology usually directly modifies the material itself and is difficult to add additional elements. A metal additive friction stir alloying device and a surface corrosion resistance modification method are provided. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention:

[0007] A metal additive friction stir alloying device comprises a shaft shoulder, a stirring head and a planer component, wherein the lower part of the stirring head is arranged inside the shaft shoulder, and the planer component is arranged at the front side of the shaft shoulder.

[0008] Preferably: the shoulder includes a first clamping portion, a conveying portion, a planing positioning portion and a shoulder portion, the upper end of the conveying portion is connected to the first clamping portion, the lower end of the conveying portion has a shoulder portion, the front side of the conveying portion is connected to the planing positioning portion, and the planing positioning portion is connected to the planing tool component.

[0009] Preferably: a wire feeding slot is provided on the side wall of the conveying portion of the shaft shoulder.

[0010] Preferably, it also includes a screw, a plurality of planer positioning holes and threaded holes are processed on the planer positioning part, the planer fixing screw hole is arranged corresponding to the planer positioning hole, and the screw is connected to the planer positioning part through the threaded hole.

[0011] Preferably: the planer component includes a third clamping portion and a shank portion, the shank portion is connected to the third clamping portion, the shank portion is a bent planer, the shank portion has a cutter head, the side surface of the third clamping portion is processed with a side milling plane, the third clamping portion is inserted into the planer positioning hole, and the screw passes through the threaded hole to tighten the third side milling plane of the third clamping portion.

[0012] Preferably, the conveying portion is processed with a notch, and the knife bar portion is arranged at the notch.

[0013] Preferably: the stirring head includes a second clamping part, a transition part, a screw conveying part and a spiral rolling part, the second clamping part, the transition part, the screw conveying part and the spiral rolling part are connected in sequence, the screw conveying part is coaxially arranged in the conveying part, the side surface of the second clamping part is processed with a side milling plane, the side surface of the transition part is processed with a disassembly groove, and the side surface of the screw conveying part has a thread.

[0014] Preferably, the spiral rolling part is in the form of a spiral end face, and adopts a first-order rotational symmetry structure, or a 2nd to 6th-order rotational symmetry structure.

[0015] A metal additive-type friction stir alloying surface corrosion resistance modification method comprises the following steps:

[0016] Step 1: Preparation before processing:

[0017] Remove the oxide film on the surface of the aluminum plate to be treated, and use acetone or anhydrous ethanol to remove oil stains and metal dust foreign matter;

[0018] Step 2: The additive friction stir alloying process includes the following steps:

[0019] Step 2.1: The first process is the planing process, ensuring that the thickness of the substrate to be processed is greater than the length of the blade of the planing tool component, and aligning the horizontal line of the front side of the planing tool component with one side of the processing surface of the substrate, so that a planing groove is formed on the surface of the substrate to be processed after planing;

[0020] Step 2.2: The high-speed rotating spiral rolling part penetrates into the surface of the substrate to be processed, and at the same time, the alloyed filamentary raw material is uniformly fed into the conveying part through the wire feeding inlet, and is pushed to the spiral rolling part under the action of the screw extrusion and transportation of the screw part of the stirring head. Under the action of the large plastic deformation of the spiral rolling part, the raw material and the substrate (aluminum plate) are thermally plasticized, and are forged and rolled to be densified, and a sufficient solid phase alloying reaction and metallurgical bonding occur, and then a flat alloying layer is formed under the action of the shaft shoulder;

[0021] Step 3: Post-processing:

[0022] According to the actual working conditions, the uneven parts of the alloyed surface are removed or not.

[0023] Preferably, the substrate is an aluminum plate, and the raw material is an aluminum alloy containing Mg, Sc, and Zr elements to perform surface alloying on an Al-Zn-Mg series aluminum alloy material.

[0024] The present invention has the following beneficial effects:

[0025] 1. The present invention can realize the manufacture of a highly corrosion-resistant alloy layer on the surface of a metal material while ensuring that the topological shape of the metal material remains unchanged, and the alloy layer has the characteristics of fine grains and homogeneity, and avoids the inherent problems of pores, cracks, segregation, etc. existing in the melting and resolidification technology;

[0026] 2. The surface of the present invention is flat after processing without generating excess height, and the thickness of the alloyed corrosion-resistant layer is controllable, which can ensure the applicability of the obtained components in actual engineering;

[0027] 3. The present invention can adjust the planing depth, the number of planing grooves, the composition of the alloyed filamentary raw materials, etc., and meet the different corrosion resistance modification requirements of various metal plates by adding elements and stirring friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a metal additive friction stir alloying device;

[0029] Figure 2 It is a schematic diagram of the stationary shoulder structure;

[0030] Figure 3 It is a schematic diagram of the partial enlarged structure of the shaft shoulder;

[0031] Figure 4 It is a schematic diagram of the structure of the stirring head;

[0032] Figure 5 It is the three-view drawing of the mixing head structure;

[0033] Figure 6 It is a schematic diagram of the planer parts;

[0034] Figure 7 It is a schematic diagram of the surface corrosion resistance modification process.

[0035] In the figure: 1-shoulder, 2-stirring head, 3-planer component, 4-base, 5-screw, 6-raw material, 101-first clamping part, 102-conveying part, 103-planing positioning part, 104-shoulder part, 10101-positioning through hole, 10201-wire feeding slot, 10201-notch, 10301-planer positioning hole, 10302-threaded hole, 201-second clamping part, 202-transition part, 203-screw conveying part, 204-spiral rolling part, 20101-side milling plane, 20301-thread, 301-third clamping part, 302-shank part, 30101-third side milling plane; a-original state of aluminum plate, b-aluminum plate after planing, c-aluminum plate after alloying. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0037] Specific implementation method 1: Combination Figure 1-6The present embodiment is described. A metal additive friction stir alloying device of the present embodiment comprises a shoulder 1, a stirring head 2 and a planer component 3. The lower portion of the stirring head 2 is arranged inside the shoulder 1, and the planer component 3 is arranged on the front side of the shoulder 1. During processing, grooves are firstly planed by the planer component 3 on the front side, and then alloying is performed by the stirring head 2 on the rear side. Under the premise of ensuring that the topological shape of the metal material remains unchanged, a highly corrosion-resistant alloying layer is manufactured on the surface of the metal material, and intrinsic problems such as pores, cracks, and segregation caused by melting and resolidification techniques are avoided. The present invention can adjust the planing depth, the number of grooves, the composition of the alloyed filamentary raw materials, etc., and meet the different corrosion-resistant modification requirements of various metal plates by adding elements and stirring friction.

[0038] Specific implementation method 2: Combination Figure 1-6 The present embodiment is described. The present embodiment is a metal additive friction stir alloying device, wherein the shoulder 1 comprises a first clamping portion 101, a conveying portion 102, a planing positioning portion 103 and a shoulder portion 104. The first clamping portion 101 is annular, the conveying portion 102 is tubular, the upper end of the conveying portion 102 is fixedly coaxially connected to the first clamping portion 101, the outer edge of the lower end of the conveying portion 102 is chamfered, the inner part of the chamfer of the lower end of the conveying portion 102 has a horizontal shoulder portion 104, the shoulder portion 104 is a complete annular plane, the front side of the conveying portion 102 is fixedly connected to the planing positioning portion 103, and the planing positioning portion 103 is connected to the planing tool component 3; the shoulder portion 104 compacts and smoothes the small granular additive raw material thermoplasticized in the spiral rolling portion of the stirring head 2, so as to achieve sufficient filling of the side planing groove of the aluminum plate to be processed and the flatness of the alloyed surface.

[0039] Specific implementation method three: Combination Figure 1-6 This embodiment is described as a metal additive friction stir alloying device, in which a wire feeding slot 10201 is provided on the side wall of the conveying portion 102 of the shoulder 1.

[0040] Specific implementation method four: Combination Figure 1-6 To illustrate this embodiment, a metal additive friction stir alloying device according to this embodiment also includes a screw 5 to achieve a detachable connection. The device has strong adaptability. A plurality of vertical planer positioning holes 10301 and horizontal or radial threaded holes 10302 are processed on the planer positioning portion 103. The planer positioning holes 10301 can be arranged circumferentially and equidistantly, or can be arranged linearly and equidistantly. The same number of planer fixing screw holes 10302 are arranged corresponding to the planer positioning holes 10301. The screw 5 is connected to the planer positioning portion 103 through the threaded hole 10302; the planer positioning hole 10301 is used to fix the planer component 3 on the front side, and transmit the forward force to the front side of the planer component 3 through the connection portion, so as to achieve uniform and stable planing and material reduction of the aluminum plate to be processed, so that the planing groove depth and surface state on each side are uniform.

[0041] Specific implementation method five: Combination Figure 1-6 The present embodiment is described. The present embodiment is a metal additive friction stir alloying device. The number of planer components 3 is less than or equal to the number of planer positioning holes 10301. The planing positioning portion 103 in the shoulder 1 is used to fix the front planer component 3. A plurality of planer positioning holes 10301 are provided on the shoulder 1, and the same number of planer fixing screw holes 10302 are provided on the side. The number is 1 to 10. The number of planer components 3 can be flexibly increased or decreased according to the alloying requirements of the aluminum plate material and the processing parameters such as the shoulder travel speed. The planer component 3 forms equidistant and equal-depth planing grooves on the surface of the aluminum plate to be processed by continuous planing. The number of planer components is 1 to 10, and the planing depth is 0.1 to 3.0 mm. The model and number of the planer components 3 are selected according to the composition of the aluminum plate to be processed and the raw material wire. The planer component 3 includes a third clamping portion 301 and a shank portion 302. The shank portion 302 has a The end is fixedly connected to one end of the third clamping part 301, the shank part 302 is a bent planer to avoid deformation under impact load, the lower end of the shank part 302 has a cutter head 30201, the side of the third clamping part 301 is processed with a side milling plane 30101, the third clamping part 301 is inserted into the planer positioning hole 10301, the screw 5 passes through the threaded hole 10302 and presses the third side milling plane 30101 of the third clamping part 301, so that the shank part 302 is fixed to the side wall of the conveying part 102, and the installation is stable, and the position of the cutter head 30201 can be adjusted by the insertion length of the third clamping part 301; the third clamping part 301 is used to be connected to the planer positioning part 103 in the stationary shaft shoulder, and is fixed by the corresponding model planer structure fixing screws; through the planing of the cutter head 30201, equidistant and equal-depth planing grooves are formed on the surface of the aluminum plate to be processed, so as to achieve uniform alloying of the surface of the aluminum plate to be processed.

[0042] Specific implementation method six: Combination Figure 1-6 The present embodiment is described. The present embodiment is a metal additive friction stir alloying device. A notch 10202 is processed on the lower part of the front side of the conveying part 102. The arbor part 302 is arranged at the notch 10202. The notch 10202 is a mounting plane, which makes the structure compact and shortens the distance between the planing and alloying processes, facilitates timely processing, improves efficiency, and reduces the occurrence of oxidation reactions. A plurality of circumferentially equidistant positioning through holes 10101 are processed on the first clamping part 101. The maximum diameter of the first clamping part 101 is greater than the maximum distance from the edge of the planing positioning part 103 to the axis of the first clamping part 101, which makes rational use of space and prevents interference. The conveying part 102 is mainly used to feed the alloyed filamentary raw material 6 and realize the downward conveyance of the raw material. A mounting plane (notch 10202) is provided thereon to facilitate disassembly and installation.

[0043] Specific implementation method VII.1: Combination Figure 1-6The present embodiment is described. The present embodiment is a metal additive friction stir alloying device, wherein the stirring head 2 comprises a second clamping portion 201, a transition portion 202, a screw conveying portion 203 and a spiral rolling portion 204. The second clamping portion 201, the transition portion 202, the screw conveying portion 203 and the spiral rolling portion 204 are coaxially fixed and connected in sequence from top to bottom. The screw conveying portion 203 is coaxially arranged in the conveying portion 102. The side surface of the second clamping portion 201 is processed with a side milling plane 20101, the side surface of the transition portion 202 is processed with a disassembly groove 20201, the side surface of the screw conveying portion 203 has a thread 20301, and the spiral rolling portion 204 has a thread groove, and the rotation direction of the thread 20301 is opposite to that of the thread groove; wherein the clamping portion 201 is used to be connected to a rotating spindle of machining equipment including but not limited to a friction stir welding machine, a CNC milling machine, a CNC machining center, etc. The rotor parts are connected, and a side milling plane 20101 is provided on the rotor for side clamping, and the transition part 202 is used to connect the clamping part 201 and the screw conveying part 203 and realize the clamping and positioning of the stirring head 2, and a disassembly groove 20201 for installation and disassembly is provided on the rotor; the feeding screw 20301 of the screw part 203 is used to feed and extrude the alloyed filamentary raw material 6 fed from the wire feeding slot 10201 of the stationary shaft shoulder toward the spiral rolling part 204, and in the process, the alloyed filamentary raw material 6 is crushed and thermoplasticized, and then filled into the side planing groove of the aluminum plate and an alloy surface layer is formed under the action of the spiral rolling part 204; the spiral rolling part 204 is a spiral end face structure, which plays a high strain rate forging and spinning role on the alloyed raw material wire 6, so that the alloyed raw material wire 6 and the aluminum alloy matrix undergo sufficient solid phase metallurgical reaction and realize the densification, refinement and homogenization of the organization.

[0044] Specific implementation method eight: Combination Figure 1-6 To illustrate the present embodiment, a metal additive friction stir alloying device is provided in the present embodiment, wherein the spiral rolling portion 204 is in the form of a spiral end face, and can adopt a first-order rotational symmetric structure, i.e., there is only one rolling point, or a 2nd to 6th order rotational symmetric structure, and the height of the turntable is 0.5 to 3.0 mm to meet the preparation of alloying layers of different controllable thicknesses.

[0045] Specific implementation method nine: Combination Figure 1-7 The present embodiment is described. A metal additive friction stir alloying surface corrosion resistance modification method of the present embodiment adopts the metal additive friction stir alloying device, the second clamping part 201 is connected to the motor on the robot arm, and the first clamping part 101 is connected to the robot arm through a thread, including the following steps:

[0046] Step 1: Preparation before processing:

[0047] First, the oxide film on the surface 4 of the aluminum plate to be treated is removed by mechanical grinding, the surface of the substrate to be treated 4 is wiped, and acetone or anhydrous ethanol is used to remove oil stains and metal dust foreign matter;

[0048] Step 2: Additive friction stir alloying process, the planing and alloying processes are carried out continuously in a device, including the following steps:

[0049] Step 2.1: The first process is the planing process. The friction stir surface alloying should ensure that the thickness of the substrate 4 to be processed is greater than the length of the cutter head 30201 of the planing tool component 3. The length of the cutter head 30201 here means the vertical distance from the lower end of the cutter head 30201 to the shaft shoulder 104. At the same time, the front horizontal line of the planing tool component 3 is aligned with one side of the processing surface of the substrate 4. It should be noted that the planing depth should be less than the length of the cutter head 30201. The length here is the length of the cutter head 30201 itself, so as to ensure the normal progress of the planing process. After planing, a V-shaped planing groove is formed on the surface of the substrate 4 to be processed;

[0050] Step 2.2: alloying process is carried out while planing, the high-speed rotating spiral rolling part 204 penetrates into the surface of the substrate 4 to be processed, and at the same time, the alloyed wire raw material 6 is uniformly fed into the conveying part 102 through the wire feeding inlet, and is pushed to the spiral rolling part 204 under the action of the extrusion and transportation of the thread 20301 of the screw part 203 of the stirring head 2, and the raw material and the substrate (aluminum plate) are thermally plasticized under the action of the large plastic deformation of the spiral rolling part 204, and are densified by forging and rolling, and sufficient solid phase alloying reaction and metallurgical bonding occur, and then a flat alloying layer is formed under the action of the shoulder part 104; it should be noted in this process that the rate of material removal by planing and cutting should be equal to the feeding rate of the alloyed wire raw material 6;

[0051] Step 3: Post-processing:

[0052] According to the actual requirements of the working conditions, mechanical milling is selected to remove or not remove the uneven parts of the alloyed surface; the present invention can adjust the planing depth, the number of planing grooves, the composition of the alloyed filamentary raw materials, and the process parameters, and further meet the different corrosion resistance modification requirements for various metal plates.

[0053] Specific implementation method ten: Combination Figure 1-7 The present embodiment is described as a metal additive stir friction alloying surface corrosion resistance modification method. The substrate 4 is an aluminum plate. The raw material 6 can be adaptively selected to use aluminum alloy wire containing Mg, Sc, and Zr elements to perform surface alloying on the Al-Zn-Mg series aluminum alloy material, modify the surface, and improve the corrosion resistance; a layer of highly corrosion-resistant aluminum is coated on the surface to improve the corrosion resistance of 7 series aluminum.

[0054] Embodiment 1:

[0055] This embodiment uses an aluminum alloy surface alloying corrosion-resistant stir friction welding device and method to perform the following steps:

[0056] Step 1: Preparation before processing: First, remove the oxide film on the surface of the 2219 aluminum plate by mechanical grinding, wipe the surface of the 2219 aluminum alloy plate, and use acetone or anhydrous ethanol to remove oil stains and metal dust foreign matter;

[0057] Step 2: Additive friction stir alloying process: Planing and alloying processes are carried out continuously through a device; the first process is the planing process. The friction stir surface alloying should ensure that the thickness of the 2219 aluminum plate is 20mm, which is greater than the length of the planer head of the planer component by 3mm. At the same time, the horizontal line of the front side of the planer component is aligned with one side of the processing surface. It should be noted that the planing depth of 2.5mm should be less than the length of the planer head by 3mm to ensure the normal planing process. After planing, a V-shaped planing groove is formed on the surface of the 2219 aluminum plate; the alloying process is carried out while planing, and the high-speed rotating The spiral rolling part penetrates into the surface of the 2219 aluminum plate, and at the same time, the 5B06 aluminum alloy raw wire is fed in at a uniform speed through the conveying part of the stationary shaft shoulder, and is pushed to the spiral rolling part under the action of the extrusion and transportation of the screw part of the stirring head. Under the action of the large plastic deformation of the spiral rolling part, the raw material and the matrix are thermally plasticized, and are densified by forging and rolling, and sufficient solid phase alloying reaction and metallurgical bonding occur, and then a flat alloying layer is formed under the action of the shaft shoulder; it should be noted that the rate of material removal by planing and cutting should be equal to the feeding rate of the 5B06 aluminum alloy raw wire.

[0058] Step 3: Post-processing: According to the actual requirements of the working conditions, choose to remove or not remove the uneven parts of the alloyed surface by machining and milling;

[0059] Step 4: Corrosion performance evaluation: The corrosion resistance of the prepared composite material was further evaluated. Through the polarization impedance of the electrochemical impedance spectrum fitting circuit in 3.5% NaCl aqueous solution at room temperature, it can be seen that the polarization impedance after immersion is two orders of magnitude higher than that of the initial 2219 base material; it can be seen that the corrosion resistance of the corrosion-resistant stir friction welding material alloyed on the aluminum alloy surface is higher than that of the 2219 aluminum alloy plate.

[0060] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metal additive friction stir alloying device, characterized in that: It comprises a shaft shoulder (1), a stirring head (2) and a planer component (3), wherein the lower part of the stirring head (2) is arranged inside the shaft shoulder (1), and the planer component (3) is arranged on the front side of the shaft shoulder (1); The shoulder (1) comprises a first clamping portion (101), a conveying portion (102), a planing positioning portion (103) and a shoulder portion (104); the upper end of the conveying portion (102) is connected to the first clamping portion (101); the lower end of the conveying portion (102) has a shoulder portion (104); the front side of the conveying portion (102) is connected to the planing positioning portion (103); and the planing positioning portion (103) is connected to the planing blade component (3); A wire feeding slot (10201) is provided on the side wall of the conveying portion (102) of the shaft shoulder (1); It also includes a screw (5), a plurality of planer positioning holes (10301) and threaded holes (10302) are processed on the planer positioning portion (103), the threaded holes (10302) are arranged corresponding to the planer positioning holes (10301), and the screw (5) is connected to the planer positioning portion (103) through the threaded holes (10302); The planer component (3) comprises a third clamping portion (301) and a shank portion (302), wherein the shank portion (302) is connected to the third clamping portion (301), the shank portion (302) is a bent planer, the shank portion (302) has a cutter head (30201), a first side milling plane (30101) is processed on the side surface of the third clamping portion (301), the third clamping portion (301) is inserted into the planer positioning hole (10301), and a screw (5) passes through the threaded hole (10302) to press against the first side milling plane (30101) of the third clamping portion (301); A notch (10202) is processed on the lower side of the conveying portion (102), and the knife bar portion (302) is arranged at the notch (10202).

2. A metal additive friction stir alloying device according to claim 1, characterized in that: The stirring head (2) comprises a second clamping portion (201), a transition portion (202), a screw conveying portion (203) and a spiral rolling portion (204); the second clamping portion (201), the transition portion (202), the screw conveying portion (203) and the spiral rolling portion (204) are connected in sequence; the screw conveying portion (203) is coaxially arranged in the conveying portion (102); the side surface of the second clamping portion (201) is processed with a second side milling plane (20101); the side surface of the transition portion (202) is processed with a disassembly groove (20201); and the side surface of the screw conveying portion (203) has a thread (20301).

3. A metal additive friction stir alloying device according to claim 2, characterized in that: The spiral rolling part (204) is in the form of a spiral end surface, and adopts a first-order rotational symmetry structure, or a 2nd to 6th-order rotational symmetry structure.

4. A method for surface corrosion resistance modification of metal additive stir friction alloying, characterized in that: A metal additive friction stir alloying device according to any one of claims 1 to 3 is used, comprising the following steps: Step 1: Preparation before processing: The oxide film on the surface of the substrate (4) to be treated is removed, and acetone or anhydrous ethanol is used to remove oil stains and metal dust foreign matter; the substrate (4) is an aluminum plate; Step 2: The additive friction stir alloying process includes the following steps: Step 2.1: The first process is the planing process, ensuring that the thickness of the substrate (4) to be processed is greater than the length of the blade (30201) of the planing blade component (3), and at the same time aligning the front horizontal line of the planing blade component (3) with one side of the processing surface of the substrate (4), so that a planing groove is formed on the surface of the substrate (4) to be processed after planing; Step 2.2: The high-speed rotating spiral rolling part (204) is inserted into the surface of the substrate (4) to be processed, and at the same time, the alloyed wire raw material (6) is uniformly fed into the conveying part (102) through the wire feeding inlet, and is pushed to the spiral rolling part (204) under the action of the extrusion and transportation of the thread (20301) of the screw conveying part (203) of the stirring head (2). Under the action of the large plastic deformation of the spiral rolling part (204), the raw material and the substrate are thermally plasticized, and are forged and rolled to be densified, and a sufficient solid phase alloying reaction and metallurgical bonding occur, and then a flat alloying layer is formed under the action of the shaft shoulder (104); Step 3: Post-processing treatment: Treat the uneven parts of the alloyed surface.

5. A metal additive friction stir alloying surface corrosion resistance modification method according to claim 4, characterized in that: The raw material (6) uses an aluminum alloy containing Mg, Sc, and Zr elements to perform surface alloying on an Al-Zn-Mg aluminum alloy material.

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