CN115233163A - Treatment method for surface alloying of magnesium alloy workpiece - Google Patents

Treatment method for surface alloying of magnesium alloy workpiece Download PDF

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Publication number
CN115233163A
CN115233163A CN202210699232.5A CN202210699232A CN115233163A CN 115233163 A CN115233163 A CN 115233163A CN 202210699232 A CN202210699232 A CN 202210699232A CN 115233163 A CN115233163 A CN 115233163A
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magnesium alloy
alloy workpiece
electron beam
alloying
machine
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Chinese (zh)
Inventor
王荣
张晶
魏德强
贤锐华
严海玲
王凯
赵欢
李新凯
任旭隆
秦启茂
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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Priority to CN202210699232.5A priority Critical patent/CN115233163A/en
Publication of CN115233163A publication Critical patent/CN115233163A/en
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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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/24—Vacuum evaporation
    • C23C14/28—Vacuum evaporation by wave energy or particle radiation
    • C23C14/30—Vacuum evaporation by wave energy or particle radiation by electron bombardment
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/02—Pretreatment of the material to be coated
    • C23C14/028—Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon

Abstract

The invention discloses a treatment method for alloying the surface of a magnesium alloy workpiece, which comprises the following steps: step 1: polishing the surface of the magnesium alloy workpiece, cleaning the pure copper target and the polished magnesium alloy workpiece to remove oil stains, and cleaning for later use; step 2: placing the magnesium alloy workpiece and the pure copper target material treated in the step (1) in a processing chamber of an electron beam welding machine, vacuumizing the electron beam welding machine, and carrying out copper plating treatment on the surface of the magnesium alloy workpiece by the electron beam welding machine to obtain a copper-plated magnesium alloy workpiece; and step 3: and (3) placing the copper-coated magnesium alloy workpiece obtained in the step (2) in a processing chamber of an electron beam machine, vacuumizing the electron beam machine, and carrying out alloying treatment on the surface of the copper-coated magnesium alloy workpiece by the electron beam machine to obtain the magnesium alloy workpiece subjected to surface alloying treatment. It has excellent corrosion resistance and wear resistance.

Description

Treatment method for surface alloying of magnesium alloy workpiece
Technical Field
The invention belongs to the technical field of metal surface modification, and particularly relates to a treatment method for surface alloying of a magnesium alloy workpiece.
Background
The magnesium alloy is gradually and widely applied in the fields of automobiles, electronic communication, aerospace and the like due to the characteristics of small density, high specific strength, good rigidity, easiness in processing, excellent electromagnetic shielding property, strong shock absorption capacity and easiness in recycling, the AZ91D magnesium alloy is the most widely applied Mg-Al-based alloy in the industry at present, but the magnesium alloy substrate cannot be protected by an oxide film on the surface of the alloy and the factors such as galvanic corrosion and the like can be caused by impurities in the alloy, and the corrosion resistance of the magnesium alloy is poor, so that the wider application of the magnesium alloy is limited.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for alloying a surface of a magnesium alloy workpiece having excellent plating adhesion and corrosion resistance.
In order to achieve the purpose, the technical scheme of the invention is as follows: a treatment method for alloying the surface of a magnesium alloy workpiece comprises the following steps:
step 1: polishing the surface of the magnesium alloy workpiece, cleaning the pure copper target and the polished magnesium alloy workpiece to remove oil stains, and cleaning for later use;
step 2: placing the magnesium alloy workpiece and the pure copper target material treated in the step (1) in a processing chamber of an electron beam welding machine, vacuumizing the electron beam welding machine, and carrying out copper plating treatment on the surface of the magnesium alloy workpiece by the electron beam welding machine to obtain a copper-plated magnesium alloy workpiece;
and step 3: and (3) placing the copper-coated magnesium alloy workpiece obtained in the step (2) in a processing chamber of an electron beam machine, vacuumizing the electron beam machine, and carrying out alloying treatment on the surface of the copper-coated magnesium alloy workpiece by the electron beam machine to obtain the magnesium alloy workpiece subjected to surface alloying treatment.
In the above technical scheme, when the electron beam welding machine is vacuumized, the vacuum degree of the electron gun chamber is 1
×10 -3 -2×10 -3 Pa, the vacuum degree of the processing chamber was controlled to 2.5X 10 -3 -3.5×10 -3 Pa。
The technological parameters of the electron beam welding machine in the technical scheme are set as electron beam acceleration voltage 60KV, electron beam focusing current 390mA, electron beam heating beam current 25mA, electron gun moving speed 3mm/s, electron beam spot diameter 2mm, and evaporation time 125s.
When the electron beam machine in the technical scheme is vacuumized, the vacuum degree of an electron gun chamber is 1 multiplied by 10 -3 -2×10 - 3 Pa, vacuum degree of the processing chamber of 4.5x10 -2 -6.5x10 -2 Pa。
The technological parameters of the electron beam machine in the technical scheme are set as electron beam acceleration voltage 60KV, electron beam focusing current 390mA, electron beam processing beam current 9-15mA, electron gun moving speed 5mm/s and electron beam scanning ring diameter 10mm.
In the above technical scheme, the process for polishing the surface of the magnesium alloy workpiece in the step 1 comprises the following steps: and (3) milling and finely machining the surface of the magnesium alloy workpiece by using a milling machine until the surface roughness reaches more than Ra1.6, and then manually finely grinding by using 800-mesh sand paper.
In the technical scheme, the thickness of the alloy coating on the surface of the magnesium alloy workpiece in the step 3 is not less than 10 mu m.
In the technical scheme, the step 2 and the step 3 are both vacuumized by adopting a diffusion pump and a roots pump connected in series.
In the technical scheme, the magnesium alloy workpiece is made of AZ91D magnesium alloy.
In the above technical scheme, the cleaning in step 1 adopts a mixed solution of acetone and absolute ethyl alcohol as a cleaning agent, and the cleaning agent is dried for later use after the cleaning.
The invention has the beneficial effects that: according to the method, the surface of the magnesium alloy workpiece made of the AZ91D magnesium alloy material is subjected to copper evaporation plating treatment through an electron beam welding machine and an electron beam machine, so that the corrosion resistance of the surface of the magnesium alloy workpiece can be effectively improved, and the surface hardness and the wear resistance can also be improved. Therefore, the invention can realize the improvement of the corrosion resistance, the surface hardness and the surface wear resistance of the surface of the magnesium alloy workpiece, and in addition, the process of the magnesium alloy electron beam copper evaporation is carried out in the vacuum processing chamber, thereby ensuring no pollution to the environment in the processing process and avoiding the contact of the magnesium alloy and the copper target material with the outside; meanwhile, the energy transfer medium is electrons, and has the characteristics of high energy conversion, good action effect and the like.
Drawings
FIG. 1 is a sectional microstructure view of a magnesium alloy as a control;
FIG. 2 is a scanning electron beam cross-sectional microstructure of a magnesium alloy workpiece after treatment in example 1 of the present invention;
FIG. 3 is a microstructure diagram of surface alloying of a magnesium alloy workpiece after treatment according to example 1 of the present invention;
FIG. 4 is a graph comparing the scanning electron beam corrosion rates of a control article of the present invention and a magnesium alloy workpiece treated in example 1;
FIG. 5 is a comparison of the friction factor of the scanning electron beam of the comparison product of the present invention and the magnesium alloy workpiece treated in example 1.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
A treatment method for alloying the surface of a magnesium alloy workpiece comprises the following steps:
step 1: the method comprises the following steps of (1) polishing the surface of a magnesium alloy workpiece (made of AZ91D magnesium alloy) (the polishing process comprises the steps of milling the surface of the magnesium alloy workpiece by a milling machine until the surface roughness of the magnesium alloy workpiece reaches above Ra1.6, and then manually and finely grinding the magnesium alloy workpiece by 800-mesh abrasive paper), cleaning a pure copper target and the magnesium alloy workpiece with the polished surface (a cleaning agent adopts a mixed solution of acetone and absolute ethyl alcohol, the volume ratio is not limited) to remove oil stains, and cleaning the magnesium alloy workpiece for later use;
step 2: placing the magnesium alloy workpiece and the pure copper target material processed in the step 1 into a processing chamber of an electron beam welding machine, vacuumizing the electron beam welding machine (adopting a diffusion pump to serially connect a roots pump for vacuumizing), and carrying out copper plating treatment on the surface of the magnesium alloy workpiece by the electron beam welding machine to obtain the copper-coated magnesium alloy workpiece, wherein when the electron beam welding machine is vacuumized, the vacuum degree of an electron gun chamber is 1.33 multiplied by 10 -3 Pa, the vacuum degree of the processing chamber was controlled to 3X 10 -3 Pa, setting the technological parameters of the electron beam welding machine to be electron beam acceleration voltage 60KV, electron beam focusing current 390mA, electron beam heating beam current 25mA, electron gun moving speed 3mm/s, electron beam spot diameter 2mm and evaporation time 125s;
and step 3: placing the copper-coated magnesium alloy workpiece obtained in the step 2 in a processing chamber of an electron beam machine, vacuumizing the electron beam machine (vacuumizing by adopting a diffusion pump connected with a roots pump in series), and alloying the surface of the copper-coated magnesium alloy workpiece by the electron beam machine to obtain the magnesium alloy workpiece subjected to surface alloying treatment, wherein when the electron beam machine is vacuumized, the vacuum degree of an electron gun chamber is 1.33 multiplied by 10 -3 Pa, vacuum degree of the processing chamber of 5X10 -2 Pa, setting the technological parameters of the electron beam machine as an electron beam acceleration voltage of 60KV, an electron beam focusing current of 390mA, an electron beam processing beam current of 9-15mA, an electron gun moving speed of 5mm/s and an electron beam scanning ring diameter of 10mm.
And (3) microscopic observation:
the magnesium alloy workpiece (reference) whose surface was not treated and the magnesium alloy workpiece treated in example 1 were observed by using a Quanta FEG 450 scanning electron microscope, as shown in fig. 1, 2 and 3, in which fig. 1 is a cross-sectional microstructure of the reference magnified 2000 times, and it can be seen that the microstructure matrix is mainly composed of a matrix having an average size ofPrimary alpha-Mg solid solution with more than 100 mu m and beta-Mg with larger size mainly distributed in crystal boundary 17 Al 12 Intermetallic compound composition, fig. 2 is a microstructure diagram of a sample section of a magnesium alloy workpiece treated in example 1 after being amplified by 200 times, fig. 3 is a fiber structure diagram of a section of an alloying layer area of the magnesium alloy workpiece treated in example 1, the grain refinement of the alloying layer area is obvious, the thickness is about 14 μm, an alloying structure with a compact structure can be seen in the alloying layer area and a heat affected area, a large amount of dendrites and polygonal granular phases are formed, large-size beta-Mg 17Al12 is completely dissolved, the interface bonding is good, and the heat affected area has obvious dendritic crystal epitaxial growth characteristics, so that the surface performance is as follows: the corrosion resistance, the hardness and the wear resistance are all improved.
Performance testing
The magnesium alloy workpiece (reference product) without surface treatment and the magnesium alloy workpiece sample treated in the example 1 are respectively processed into a test electrode (connecting lead) with the specification of 10mm multiplied by 10mm, the test sample is sealed and exposed to the test surface (the non-test surface is sealed and wrapped by metallographic cold-inlaid epoxy resin), the open-circuit voltage of the test sample is measured by using an NE660 electrochemical workstation, the corrosion resistance of the surface of the test sample is tested at the rate of 5mV/s in the range of 300mV to 600mV of the open-circuit voltage, and the tested surface area is 1cm 2 The selected reference electrode is a saturated calomel electrode, a platinum electrode and the electrolytic cell solution is as follows: 3.5% aqueous NaCl; the microhardness of the workpiece is measured by an HDX-1000TM microhardness meter with a load of 0.981N and a load time of 10s, the microhardness of the magnesium alloy workpiece treated in the embodiment 1 is 129.3HV, the microhardness of a reference product is 53.3HV, and the integral hardness is improved by 2.4 times; and (3) applying a load of 20N by using a CFT-1 type material surface property comprehensive tester, carrying out a friction wear experiment on the surface of the sample with the reciprocating length of 4mm and the running time of 10min, and weighing by using an FA114 type electronic analysis balance to obtain the wear weight loss.
After the corrosion resistance experiment, a tafel curve was obtained, and the corrosion rates of the control and the sample of the magnesium alloy workpiece treated by the electron beam of example 1 were obtained after the treatment, as shown in fig. 4. The corrosion rate of the control 8.451 × 10 can be seen from the graph -4 A/cm 2 The corrosion rate of the magnesium alloy workpiece treated by the embodiment 1 is obviously reduced, and the best condition can be reduced to 3.503X 10 -5 A/cm 2 The corrosion resistance of the surface of the magnesium alloy workpiece treated by the example 1 is about 24 times that of the comparative product.
In the friction and wear test, as shown in fig. 5, it can be seen that the friction coefficient of the magnesium alloy workpiece treated in example 1 is reduced relative to the control, the wear loss is reduced from 0.0012g to 0.0004g, and the wear loss of the magnesium alloy workpiece treated in example 1 is only 1/3 of the wear loss of the control.
Example 2
A treatment method for alloying the surface of a magnesium alloy workpiece comprises the following steps:
step 1: the method comprises the following steps of (1) polishing the surface of a magnesium alloy workpiece (made of AZ91D magnesium alloy) (the polishing process comprises the steps of milling the surface of the magnesium alloy workpiece by a milling machine until the surface roughness of the magnesium alloy workpiece reaches above Ra1.6, and then manually and finely grinding the magnesium alloy workpiece by 800-mesh abrasive paper), cleaning a pure copper target and the magnesium alloy workpiece with the polished surface (a cleaning agent adopts a mixed solution of acetone and absolute ethyl alcohol, the volume ratio is not limited) to remove oil stains, and cleaning the magnesium alloy workpiece for later use;
step 2: placing the magnesium alloy workpiece and the pure copper target material processed in the step 1 into a processing chamber of an electron beam welding machine, vacuumizing the electron beam welding machine (vacuumizing by adopting a diffusion pump to be connected with a roots pump in series), and carrying out copper plating treatment on the surface of the magnesium alloy workpiece by using the electron beam welding machine to obtain the copper-coated magnesium alloy workpiece, wherein when the electron beam welding machine is vacuumized, the vacuum degree of an electron gun chamber is 1
10 -3 Pa, the vacuum degree of the processing chamber was controlled to 2.5X 10 -3 Pa, setting the technological parameters of the electron beam welding machine to be electron beam acceleration voltage 60KV, electron beam focusing current 390mA, electron beam heating beam current 25mA, electron gun moving speed 3mm/s, electron beam spot diameter 2mm and evaporation time 125s;
and step 3: placing the copper-coated magnesium alloy workpiece obtained in the step 2 in a processing chamber of an electron beam machine,vacuumizing the electron beam machine (adopting a diffusion pump to serially connect a roots pump for vacuumizing), alloying the surface of the copper-coated magnesium alloy workpiece by the electron beam machine to obtain the magnesium alloy workpiece with alloyed surface, wherein when the electron beam machine vacuumizes, the vacuum degree of an electron gun chamber is 1 multiplied by 10 -3 Pa, vacuum degree of the processing chamber of 4.5X10 -2 Pa, setting the technological parameters of the electron beam machine as an electron beam acceleration voltage of 60KV, an electron beam focusing current of 390mA, an electron beam processing beam current of 9-15mA, an electron gun moving speed of 5mm/s and an electron beam scanning ring diameter of 10mm.
Example 3
A treatment method for alloying the surface of a magnesium alloy workpiece comprises the following steps:
step 1: the method comprises the following steps of (1) polishing the surface of a magnesium alloy workpiece (made of AZ91D magnesium alloy) (the polishing process comprises the steps of milling the surface of the magnesium alloy workpiece by a milling machine until the surface roughness of the magnesium alloy workpiece reaches above Ra1.6, and then manually and finely grinding the magnesium alloy workpiece by 800-mesh abrasive paper), cleaning a pure copper target and the magnesium alloy workpiece with the polished surface (a cleaning agent adopts a mixed solution of acetone and absolute ethyl alcohol, the volume ratio is not limited) to remove oil stains, and cleaning the magnesium alloy workpiece for later use;
step 2: placing the magnesium alloy workpiece and the pure copper target material processed in the step 1 into a processing chamber of an electron beam welding machine, vacuumizing the electron beam welding machine (vacuumizing by adopting a diffusion pump to be connected with a roots pump in series), and carrying out copper plating treatment on the surface of the magnesium alloy workpiece by using the electron beam welding machine to obtain the copper-coated magnesium alloy workpiece, wherein when the electron beam welding machine is vacuumized, the vacuum degree of an electron gun chamber is 2
10 -3 Pa, the vacuum degree of the processing chamber was controlled to 3.5X 10 -3 Pa, setting the technological parameters of the electron beam welding machine to be electron beam acceleration voltage 60KV, electron beam focusing current 390mA, electron beam heating beam current 25mA, electron gun moving speed 3mm/s, electron beam spot diameter 2mm and evaporation time 125s;
and step 3: placing the copper-coated magnesium alloy workpiece obtained in the step 2 in a processing chamber of an electron beam machine, and vacuumizing the electron beam machinePerforming vacuum treatment (adopting a diffusion pump to be connected with a roots pump in series for vacuum treatment), and performing alloying treatment on the surface of the copper coated magnesium alloy workpiece by using an electron beam machine to obtain the magnesium alloy workpiece with the alloyed surface, wherein when the electron beam machine performs vacuum treatment, the vacuum degree of an electron gun chamber is 2 multiplied by 10 -3 Pa, vacuum degree of the processing chamber of 5.5X 10 -2 Pa, setting the technological parameters of the electron beam machine as an electron beam acceleration voltage of 60KV, an electron beam focusing current of 390mA, an electron beam processing beam current of 9-15mA, an electron gun moving speed of 5mm/s and an electron beam scanning ring diameter of 10mm.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A treatment method for alloying the surface of a magnesium alloy workpiece is characterized by comprising the following steps:
step 1: polishing the surface of the magnesium alloy workpiece, cleaning the pure copper target and the polished magnesium alloy workpiece to remove oil stains, and cleaning for later use;
step 2: placing the magnesium alloy workpiece and the pure copper target material treated in the step (1) in a processing chamber of an electron beam welding machine, vacuumizing the electron beam welding machine, and carrying out copper plating treatment on the surface of the magnesium alloy workpiece by the electron beam welding machine to obtain a copper-plated magnesium alloy workpiece;
and 3, step 3: and (3) placing the copper-coated magnesium alloy workpiece obtained in the step (2) in a processing chamber of an electron beam machine, vacuumizing the electron beam machine, and carrying out alloying treatment on the surface of the copper-coated magnesium alloy workpiece by the electron beam machine to obtain the magnesium alloy workpiece subjected to surface alloying treatment.
2. The method for surface alloying of magnesium alloy workpiece according to claim 1, wherein the vacuum degree of the electron gun chamber is 1 x10 when the electron beam welder is vacuumized -3 -2×10 -3 Pa, the vacuum degree of the processing chamber was controlled to 2.5X 10 -3 -3.5×10 -3 Pa。
3. The method for processing the surface alloying of the magnesium alloy workpiece as claimed in claim 2, wherein the process parameters of the electron beam welding machine are set to 60KV electron beam acceleration voltage, 390mA electron beam focusing current, 25mA electron beam heating beam current, 3mm/s electron gun moving speed, 2mm electron beam spot diameter and 125s evaporation time.
4. The method for surface alloying of magnesium alloy workpiece according to claim 1, wherein the electron beam machine is evacuated to a vacuum degree of 1 x10 in the electron gun chamber -3 -2×10 -3 Pa, vacuum degree of the processing chamber of 4.5x10 -2 -6.5x10 -2 Pa。
5. The method for processing the surface alloying of the magnesium alloy workpiece as claimed in claim 4, wherein the process parameters of the electron beam machine are set as an electron beam acceleration voltage of 60KV, an electron beam focusing current of 390mA, an electron beam processing beam current of 9-15mA, an electron gun moving speed of 5mm/s and an electron beam scanning ring diameter of 10mm.
6. The method for alloying the surface of the magnesium alloy workpiece according to claim 1, wherein the polishing process for the surface of the magnesium alloy workpiece in the step 1 comprises the following steps: and (3) milling and finely machining the surface of the magnesium alloy workpiece by using a milling machine until the surface roughness reaches more than Ra1.6, and then manually finely grinding by using 800-mesh sand paper.
7. The method for processing the surface alloying of the magnesium alloy workpiece as claimed in claim 1, wherein the thickness of the alloy coating on the surface of the magnesium alloy workpiece in the step 3 is not less than 10 μm.
8. The method for processing surface alloying of magnesium alloy workpieces according to any one of claims 1-7, wherein the evacuation processing in step 2 and step 3 is performed by using a diffusion pump and a Roots pump in series.
9. The method for alloying the surface of the magnesium alloy workpiece according to claim 8, wherein the magnesium alloy workpiece is made of AZ91D magnesium alloy.
10. The method for processing the surface alloying of the magnesium alloy workpiece according to claim 8, wherein the cleaning in the step 1 is performed by using a mixed solution of acetone and absolute ethyl alcohol as a cleaning agent, and the cleaning agent is dried for later use after the cleaning.
CN202210699232.5A 2022-06-20 2022-06-20 Treatment method for surface alloying of magnesium alloy workpiece Pending CN115233163A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135817A (en) * 1988-07-06 1992-08-04 Kabushiki Kaisha Kobe Seiko Sho Zn-Mg alloy vapor deposition plated metals of high corrosion resistance, as well as method of producing them
CN101294283A (en) * 2007-04-29 2008-10-29 比亚迪股份有限公司 Method for processing magnesium alloy surface
CN102677014A (en) * 2012-05-29 2012-09-19 重庆理工大学 Modification method for alloying surface of magnesium alloy
CN113118608A (en) * 2021-04-20 2021-07-16 北京航空航天大学 Step-by-step electron beam fusion welding and laser shock peening composite manufacturing device and method
CN113174553A (en) * 2021-04-13 2021-07-27 浙江工业大学 Method for improving corrosion resistance of magnesium alloy by combining electron beam remelting and micro-arc oxidation
CN114182198A (en) * 2021-11-18 2022-03-15 桂林电子科技大学 AZ91D magnesium alloy electron beam copper evaporation plating method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135817A (en) * 1988-07-06 1992-08-04 Kabushiki Kaisha Kobe Seiko Sho Zn-Mg alloy vapor deposition plated metals of high corrosion resistance, as well as method of producing them
CN101294283A (en) * 2007-04-29 2008-10-29 比亚迪股份有限公司 Method for processing magnesium alloy surface
CN102677014A (en) * 2012-05-29 2012-09-19 重庆理工大学 Modification method for alloying surface of magnesium alloy
CN113174553A (en) * 2021-04-13 2021-07-27 浙江工业大学 Method for improving corrosion resistance of magnesium alloy by combining electron beam remelting and micro-arc oxidation
CN113118608A (en) * 2021-04-20 2021-07-16 北京航空航天大学 Step-by-step electron beam fusion welding and laser shock peening composite manufacturing device and method
CN114182198A (en) * 2021-11-18 2022-03-15 桂林电子科技大学 AZ91D magnesium alloy electron beam copper evaporation plating method

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魏德强;李新凯;任旭隆;: "电子束表面改性研究进展", 热加工工艺, no. 18 *

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