WO2017116020A1 - Alliage de magnésium ayant d'excellentes propriétés mécaniques et de résistance à la corrosion et son procédé de fabrication - Google Patents

Alliage de magnésium ayant d'excellentes propriétés mécaniques et de résistance à la corrosion et son procédé de fabrication Download PDF

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WO2017116020A1
WO2017116020A1 PCT/KR2016/013959 KR2016013959W WO2017116020A1 WO 2017116020 A1 WO2017116020 A1 WO 2017116020A1 KR 2016013959 W KR2016013959 W KR 2016013959W WO 2017116020 A1 WO2017116020 A1 WO 2017116020A1
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weight
magnesium alloy
magnesium
parts
corrosion resistance
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Korean (ko)
Inventor
임창동
유봉선
김하식
김영민
문병기
배준호
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Korea Institute of Machinery and Materials KIMM
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Korea Institute of Machinery and Materials KIMM
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Priority to US16/066,003 priority Critical patent/US10947609B2/en
Priority to JP2018531123A priority patent/JP6710280B2/ja
Priority to CN201680074714.4A priority patent/CN108431261A/zh
Priority to EP16881972.0A priority patent/EP3399060B1/fr
Priority claimed from KR1020160161445A external-priority patent/KR101933589B1/ko
Publication of WO2017116020A1 publication Critical patent/WO2017116020A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/06—Making sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Definitions

  • the present invention relates to a magnesium alloy excellent in mechanical properties and corrosion resistance and a method for producing the same, and more particularly to a magnesium alloy improved corrosion resistance and a method for producing the same without deterioration of mechanical properties.
  • Magnesium (Mg) which is a lightweight metal, or an alloy containing magnesium as its main component, has excellent specific strength, dimensional stability, machinability, and vibration absorption, and has recently been used in transportation equipment, home appliances, and medical devices such as automobiles, railways, aircraft, and ships. It can be applied to various fields that require lightweight and biodegradation characteristics such as, household goods. Therefore, it is spotlighted as a core material of the industry.
  • magnesium has low corrosion resistance with strong chemical activity.
  • Korean Patent No. 036099 describes a method for improving the corrosion resistance of an Al-containing magnesium alloy produced by the die casting method, wherein the method is characterized by improving the corrosion resistance by changing heat treatment conditions. have.
  • Another object of the present invention is to provide a method for economically producing a magnesium alloy having improved corrosion resistance without deteriorating mechanical properties.
  • the magnesium alloy is increased Fe solid solution
  • a magnesium alloy having excellent mechanical properties and corrosion resistance, which is reduced in corrosiveness.
  • the scandium may include 0.05 parts by weight to 0.5 parts by weight.
  • the corrosion rate may be 0.5 mm / y or less when immersed for 72 hours in 3.5 wt% saline.
  • the yield strength may be 80 to 120 MPa
  • the tensile strength is 160 to 180 MPa
  • the elongation may be 6 to 13%.
  • based on 100 parts by weight of the magnesium alloy 0.5 to 7.0 parts by weight of zinc may be further included.
  • the yield strength may be 120 to 190 MPa
  • the tensile strength is 210 to 310 MPa
  • the elongation may be 20 to 30%.
  • magnesium alloy based on 100 parts by weight of magnesium alloy, it may further include 2.5 to 10 parts by weight of tin.
  • the yield strength may be 130 to 280MPa, tensile strength is 210 to 310MPa, elongation may be 5 to 17%.
  • magnesium alloy based on 100 parts by weight of magnesium alloy, it may further include 2 to 10 parts by weight of aluminum.
  • the yield strength may be 130 to 200 MPa
  • the tensile strength is 230 to 320 MPa
  • the elongation may be 10 to 25%.
  • the composition may further include a composition selected from Mg-Zn-Al, Mg-Zn-Sn, Mg-Al-Sn, and Mg-Zn-Al-Sn.
  • the method comprises: casting a magnesium alloy containing scandium from 0.001 part by weight to 1.0 part by weight with respect to 100 parts by weight of magnesium alloy, the balance being magnesium and inevitable impurities; Homogenizing the cast magnesium alloy; And preheating and extruding the homogenized magnesium alloy, the magnesium alloy is provided with a method of producing a magnesium alloy excellent in mechanical properties and corrosion resistance that the Fe solid solution is increased and the corrosion resistance is reduced.
  • the corrosion resistance of the magnesium alloy can be improved by adding scandium, which can not only suppress the micro-galvanic corrosion between the matrix and the impurity, but also simultaneously improve the passivation properties of the film formed on the surface without deteriorating the mechanical properties.
  • Magnesium alloy having excellent mechanical properties and corrosion resistance according to the present invention can be usefully used in various fields requiring lightweight and biodegradable properties such as automobiles, railways, aircraft, ships, transportation equipment, home appliances, medical equipment, household goods, etc. have.
  • Magnesium alloy excellent mechanical properties and corrosion resistance according to the present invention can be usefully used in the field of medical devices in contact with the body, such as implants such as stents and plates.
  • 1 is a graph showing the corrosion rate through the results of the immersion test (immersion test) according to the scandium content of pure magnesium (Pure Magnesium) according to an embodiment of the present invention.
  • FIG. 2 is a photograph showing the external characteristics of the magnesium alloy after the immersion test (immersion test) according to the scandium content of pure magnesium (Pure Magnesium) according to an embodiment of the present invention.
  • Figure 3 is a graph showing the mechanical properties (yield strength, tensile strength, elongation) according to the scandium content of pure magnesium (Pure Magnesium) according to an embodiment of the present invention.
  • Figure 4 is a graph showing the corrosion rate according to the scandium content of the magnesium-zinc alloy in accordance with an embodiment of the present invention.
  • 5 to 8 are photographs showing the external characteristics of the magnesium-zinc alloy after an immersion test according to the scandium content of the magnesium-zinc alloy according to an embodiment of the present invention.
  • FIG. 9 is a graph showing the mechanical characteristics (yield strength, tensile strength, elongation) according to the scandium content of the magnesium-zinc alloy according to an embodiment of the present invention.
  • FIG. 10 is a graph showing the corrosion rate according to the scandium content of the magnesium-tin alloy according to an embodiment of the present invention.
  • 11 to 14 are photographs showing the external characteristics of the magnesium-tin alloy after an immersion test according to the scandium content of the magnesium-tin alloy according to one embodiment of the present invention.
  • 16 is a graph showing the corrosion rate according to the scandium content of the magnesium-aluminum alloy according to an embodiment of the present invention.
  • 17 to 19 are graphs showing external characteristics of the magnesium-aluminum alloy after an immersion test according to the scandium content of the magnesium-aluminum alloy according to one embodiment of the present invention.
  • 20 is a graph showing the mechanical properties (yield strength, tensile strength, elongation) according to the scandium content of the magnesium-aluminum alloy according to an embodiment of the present invention.
  • FIG. 21 is a graph showing the amount of iron (Fe) dissolved in a magnesium alloy containing scandium according to an embodiment of the present invention.
  • 22 is a flowchart illustrating a method of manufacturing a magnesium alloy according to an embodiment of the present invention.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the magnesium alloy is increased Fe solid solution
  • a magnesium alloy having excellent mechanical properties and corrosion resistance, which is reduced in corrosiveness.
  • a method of controlling the content of impurities or increasing the corrosion potential of the magnesium matrix is applied.
  • the method of controlling the alloy manufacturing process to continuously generate a second phase in the form of a network (network) that can act as an obstacle to corrosion is also applied.
  • these methods are not only able to effectively control micro-galvanic corrosion between matrix and impurities, but also lead to degradation of mechanical properties.
  • the present invention provides scandium (Sc) to magnesium alloys that exhibit a dual effect that not only suppresses micro-galvanic corrosion between matrix and impurities, but also simultaneously improves the passivation properties of the film formed on the surface without deteriorating mechanical properties. It is a technique to add.
  • the present invention does not reduce the content of impurities present in magnesium and magnesium alloys by physical or chemical methods, but changes the electrochemical properties of the impurities through the addition of trace elements and at the same time the passive properties of the film formed on the surface. By improving, corrosion resistance is improved.
  • FIG. 1 is a graph showing the corrosion rate through the results of the immersion test (immersion test) according to the scandium content of pure magnesium (Pure Magnesium) according to an embodiment of the present invention.
  • Figure 2 is a photograph showing the external characteristics of the magnesium alloy after the immersion test (immersion test) according to the scandium content of pure magnesium (Pure Magnesium) according to an embodiment of the present invention.
  • FIG. 1 and FIG. 2 it shows very improved corrosion resistance compared to pure magnesium.
  • a commercial material level of purity 99.9% based on Pure Mg
  • high purity material 99.99% based on Pure Mg
  • the scandium is 0.001 to 1.0 parts by weight, 0.05 to 0.25 parts by weight, 0.001 to 0.1 parts by weight, 0.05 to 0.5 parts by weight, or 0.05 to 0.1 parts by weight based on 100 parts by weight of magnesium alloy It may include, but is not limited to 0.05 to 0.5 parts by weight is suitable.
  • the content of scandium is less than 0.001, the content of scandium is too small to obtain an effect of improving corrosion resistance, and when the content of scandium is more than 1.0, corrosiveness may be increased.
  • the corrosion rate may be 0.5 mm / y or less when immersed for 72 hours in 3.5 wt% saline.
  • the yield strength may be 80 to 120 MPa
  • the tensile strength is 160 to 180 MPa
  • the elongation may be 6 to 13%.
  • Figure 3 is a graph showing the mechanical properties (yield strength, tensile strength, elongation) according to the scandium content of pure magnesium (Pure Magnesium) according to an embodiment of the present invention. According to Figure 3 it can be seen that the yield strength and tensile strength increases as the content of scandium increases. This means that the mechanical strength increases with increasing scandium content. As shown in the graph, the magnesium alloy of the present invention can be improved in corrosion resistance without lowering the mechanical properties.
  • the magnesium alloy may include impurities which are inevitably mixed in the raw material or manufacturing process of the alloy, and preferably, 0.001 to 0.007 parts by weight of iron and 0.001 to 0.002 parts by weight of silicon based on 100 parts by weight of the magnesium alloy.
  • Calcium contained in the magnesium alloy may help to increase the strength of the alloy by precipitation strengthening and solid solution strengthening, and when the calcium content is less than 0.005, the precipitation strengthening effect may be insignificant. Can be promoted.
  • Manganese contained in the magnesium alloy helps to enhance the strength of the alloy by solid solution strengthening, and forms a compound containing manganese and impurities in the alloy, thereby improving the corrosion resistance of the magnesium alloy, manganese content of 0.003 weight If the amount is less than the effect is insignificant, there is no effect, if it is more than 0.012 parts by weight of the manganese fraction is too high may promote galvanic corrosion.
  • based on 100 parts by weight of the magnesium alloy 0.5 to 7.0 parts by weight of zinc may be further included.
  • the scandium is 0.001 to 0.5 parts by weight, 0.05 to 0.25 parts by weight, 0.05 to 0.1 parts by weight, 0.001 to 0.25 parts by weight, 0.001 to 0.1 based on 100 parts by weight of magnesium of the magnesium-zinc alloy It may be included in parts by weight or 0.01 to 0.5 parts by weight, but is not limited to 0.05 to 0.25 parts by weight is suitable.
  • the content of scandium is less than 0.001, the content of scandium is too small to obtain the effect of improving corrosion resistance, and when the content of scandium is more than 0.5, corrosiveness may increase.
  • Figure 4 is a graph showing the corrosion rate according to the scandium content of the magnesium-zinc alloy in accordance with an embodiment of the present invention.
  • 5 to 8 are photographs showing the external characteristics of the magnesium-zinc alloy after an immersion test according to the scandium content of the magnesium-zinc alloy according to an embodiment of the present invention.
  • the yield strength may be 120 to 190 MPa
  • the tensile strength is 210 to 310 MPa
  • the elongation may be 20 to 30%.
  • FIG. 9 is a graph showing the mechanical characteristics (yield strength, tensile strength, elongation) according to the scandium content of the magnesium-zinc alloy according to an embodiment of the present invention.
  • the yield strength and the tensile strength increase as the scandium content increases regardless of the zinc content.
  • the zinc content is included in an amount of 2 parts by weight or less based on 100 parts by weight of the magnesium alloy, the elongation also increases as the content of scandium increases. Therefore, the magnesium alloy of the present invention can be improved at the same time mechanical properties and corrosion resistance.
  • magnesium alloy based on 100 parts by weight of magnesium alloy, it may further include 2.5 to 10 parts by weight of tin.
  • the scandium is 0.001 to 0.5 parts by weight, 0.05 to 0.25 parts by weight, 0.05 to 0.1 parts by weight, 0.001 to 0.1 parts by weight, 0.001 to 0.25 to 100 parts by weight of magnesium of the magnesium-tin alloy It may be included in parts by weight, or 0.01 to 0.5 parts by weight, but is not limited to 0.05 to 0.1 parts by weight is suitable.
  • the content of scandium is less than 0.001, the content of scandium is too small to obtain the effect of improving corrosion resistance, and when the content of scandium is more than 0.5, corrosiveness may increase.
  • FIG. 10 is a graph showing the corrosion rate according to the scandium content of the magnesium-tin alloy according to an embodiment of the present invention.
  • 11 to 14 are photographs showing the external characteristics of the magnesium-tin alloy after an immersion test according to the scandium content of the magnesium-tin alloy according to one embodiment of the present invention.
  • the yield strength may be 130 to 280MPa, tensile strength is 210 to 310MPa, elongation may be 5 to 17%.
  • the yield strength and the tensile strength increase as the scandium content increases from 0.001 to 0.25 parts by weight, regardless of the tin content. Therefore, the magnesium alloy of the present invention can be improved at the same time mechanical properties and corrosion resistance.
  • magnesium alloy based on 100 parts by weight of magnesium alloy, it may further include 2 to 10 parts by weight of aluminum.
  • the scandium may include 0.001 to 1.0 parts by weight, 0.05 to 1.0 parts by weight, 0.001 to 0.5 parts by weight, or 0.01 to 1.0 parts by weight based on 100 parts by weight of magnesium of the magnesium-aluminum alloy.
  • 0.05 to 1.0 parts by weight is suitable.
  • the content of scandium is less than 0.001, the content of scandium is too small to obtain an effect of improving corrosion resistance, and when the content of scandium is more than 1.0, corrosiveness may be increased.
  • 16 is a graph showing the corrosion rate according to the scandium content of the magnesium-aluminum alloy according to an embodiment of the present invention.
  • 17 to 19 is a graph showing the corrosion rate according to the scandium content of the magnesium-aluminum alloy according to an embodiment of the present invention.
  • the yield strength may be 130 to 200 MPa
  • the tensile strength is 230 to 320 MPa
  • the elongation may be 10 to 25%.
  • 20 is a graph showing the mechanical properties (yield strength, tensile strength, elongation) according to the scandium content of the magnesium-aluminum alloy according to an embodiment of the present invention.
  • the yield strength and tensile strength increase as the scandium content increases from 0.001 to 1.0 regardless of the aluminum content. Therefore, the magnesium alloy of the present invention can be improved at the same time mechanical properties and corrosion resistance.
  • FIG. 21 is a graph showing the amount of iron (Fe) dissolved in a magnesium alloy containing scandium according to an embodiment of the present invention.
  • the iron solution of the present invention means the amount of iron component that can be dissolved in magnesium metal.
  • Heavy metal elements such as iron
  • the present invention is to provide a magnesium alloy having high mechanical strength while improving the solid solution of iron in magnesium.
  • the case of containing scandium may have a relatively high iron solubility regardless of the type and content of zinc, tin, and aluminum contained in comparison with the case where it does not.
  • the scandium-containing alloy may be selected from Mg-Zn-Al, Mg-Zn-Sn, Mg-Al-Sn, and Mg-Zn-Al-Sn.
  • containing scandium it may have a relatively high iron solubility regardless of the type and content of the containing component selected from one or more of zinc, tin, and aluminum as compared to when it does not.
  • the method comprises: casting a magnesium alloy containing scandium from 0.001 part by weight to 1.0 part by weight with respect to 100 parts by weight of magnesium alloy, the balance being magnesium and inevitable impurities; Homogenizing the cast magnesium alloy; And preheating and extruding the homogenized magnesium alloy, the magnesium alloy is provided with a method of producing a magnesium alloy excellent in mechanical properties and corrosion resistance that the Fe solid solution is increased and the corrosion resistance is reduced.
  • 22 is a flowchart illustrating a method of manufacturing a magnesium alloy according to an embodiment of the present invention.
  • the casting step may be cast at 650 to 800 °C. Although not limited thereto, casting may not be performed properly when the casting temperature is lower than 650 ° C or higher than 800 ° C.
  • the casting, homogenizing and extruding may be performed by known techniques. For example, it may be performed by sand casting, sheet casting, die casting or a combination thereof. Detailed methods are described in the Examples below.
  • Sc was added to pure Mg (99.9%) to prepare a magnesium alloy according to the present invention, and Sc was added in the form of Mg-2Sc mother alloy. At this time, Mg-2Sc mother alloy was added so that Sc is included as 0.001, 0.01, 0.05, 0.1, 0.25, 0.5, 1.0 wt% in pure Mg.
  • extrusion was performed to prepare a plate-shaped extruded material having a thickness of 6 mm and a width of 28 mm.
  • AZ61 alloy is a commercial magnesium alloy prepared for use as a comparative example.
  • the prepared billet was subjected to homogenization treatment at 500 ° C. for 24 hours, and then processed into a billet having a circular cylinder shape of 78 mm in diameter and 140 to 160 mm in length.
  • the billet thus processed was preheated at 350 ° C. for 3 hours and then extruded at a ram speed of 1.0 mm / s to prepare a plate-shaped extruded material having a thickness of 6 mm and a width of 28 mm.
  • the composition of the magnesium-zinc alloy is shown in Table 2 below.
  • Example 2 Mg-1Zn 1.02 - 0.003 - 0.007 bal.
  • Example 7 Mg-1Zn-0.001Sc 0.96 0.001 0.017 - 0.009 bal.
  • Example 8 Mg-1Zn-0.01Sc 1.02 0.007 0.003 - 0.009 bal.
  • Example 9 Mg-1Zn-0.1Sc 1.01 0.102 0.018 - 0.007 bal.
  • Example 10 Mg-1Zn-1.0Sc 0.98 0.868 0.025 - 0.012 bal. Comparative Example 3 Mg-2Zn 1.82 - 0.004 - 0.007 bal.
  • Example 11 Mg-2Zn-0.001Sc 1.86 - 0.007 - 0.019 bal.
  • Example 12 Mg-2Zn-0.01Sc 2.00 0.007 0.010 - 0.007 bal.
  • Example 13 Mg-2Zn-0.1Sc 2.12 0.084 0.063 - 0.007 bal.
  • Example 14 Mg-2Zn-1.0Sc 2.01 0.844 0.138 - 0.076 bal. Comparative Example 4 Mg-4Zn 3.65 - 0.008 0.009 0.005 bal.
  • Example 15 Mg-4Zn-0.001Sc 4.10 - 0.004 0.021 0.003 bal.
  • Example 16 Mg-4Zn-0.01Sc 4.03 0.006 0.003 - 0.003 bal.
  • Example 17 Mg-4Zn-0.1Sc 4.02 0.089 0.005 0.012 0.010 bal.
  • Example 18 Mg-4Zn-1.0Sc 4.13 0.79 0.003 0.036 0.004 bal. Comparative Example 5 Mg-6Zn 5.59 - 0.009 0.008 0.004 bal.
  • Example 19 Mg-6Zn-0.001Sc 5.58 0.001 0.001 0.042 0.004 bal.
  • Example 20 Mg-6Zn-0.01Sc 6.23 0.006 0.004 0.081 0.007 bal.
  • Example 21 Mg-6Zn-0.1Sc 6.36 0.089 0.004 0.053 0.008 bal.
  • Example 22 Mg-6Zn-1.0Sc 6.29 0.80 0.009 0.085 0.007 bal.
  • the raw material thus prepared is charged to a carbon crucible, heated to 700 ° C. or more using an induction melting furnace, dissolved, and then gradually cooled. Billets were prepared.
  • the billets thus prepared were homogenized at 400 ° C. for 24 hours and then processed into billets having a circular cylinder shape of 78 mm in diameter and 140 to 160 mm in length.
  • the billet thus processed was preheated at 300 ° C. for 3 hours and then extruded at a ram speed of 1.0 mm / s to prepare a plate-shaped extruded material having a thickness of 6 mm and a width of 28 mm.
  • the composition of the magnesium-tin alloy is shown in Table 3 below.
  • Example 6 Mg-3Sn 2.84 - 0.007 0.13 0.014 bal.
  • Example 23 Mg-3Sn-0.001Sc 2.84 - 0.002 0.02 0.005 bal.
  • Example 24 Mg-3Sn-0.01Sc 2.76 0.007 0.001 0.02 0.006 bal.
  • Example 25 Mg-3Sn-0.1Sc 2.80 0.08 0.002 0.02 0.007 bal.
  • Example 26 Mg-3Sn-1.0Sc 2.86 0.62 0.002 0.008 0.008 bal.
  • Comparative Example 7 Mg-5Sn 4.68 - 0.003 0.03 0.005 bal.
  • Example 27 Mg-5Sn-0.001Sc 4.87 - 0.001 0.02 0.005 bal.
  • Example 28 Mg-5Sn-0.01Sc 4.73 0.006 0.002 0.012 0.006 bal.
  • Example 29 Mg-5Sn-0.1Sc 4.80 0.09 0.002 0.010 0.006 bal.
  • Example 30 Mg-5Sn-1.0Sc 4.93 0.58 0.002 0.011 0.008 bal. Comparative Example 8 Mg-6Sn 5.48 - 0.002 0.02 0.006 bal.
  • Example 31 Mg-6Sn-0.001Sc 5.77 0.001 0.003 0.02 0.006 bal.
  • Example 32 Mg-6Sn-0.01Sc 5.70 0.009 0.001 0.005 0.007 bal.
  • Example 33 Mg-6Sn-0.1Sc 5.82 0.09 0.003 0.008 0.008 bal.
  • Example 34 Mg-6Sn-1.0Sc 4.01 0.25 0.002 0.001 0.006 bal. Comparative Example 9 Mg-8Sn 7.59 - 0.001 0.04 0.005 bal.
  • Example 35 Mg-8Sn-0.001Sc 7.77 0.001 0.002 0.05 0.006 bal.
  • Example 36 Mg-8Sn-0.01Sc 7.84 - 0.001 0.02 0.007 bal.
  • Example 37 Mg-8Sn-0.1Sc 7.93 0.09 0.002 0.011 0.007 bal.
  • Example 38 Mg-8Sn-1.0Sc 6.97 0.69 0.037 0.003 0.004 bal.
  • the raw material thus prepared is charged to a carbon crucible, heated to 700 ° C. or more using an induction melting furnace, dissolved, and then gradually cooled. Billets were prepared.
  • the billet thus prepared was homogenized at 500 ° C. for 24 hours and then processed into a billet in the form of a circular cylinder having a diameter of 78 mm and a length of 140 to 160 mm.
  • the billet thus processed was preheated at 300 ° C. for 3 hours and then extruded at a ram speed of 1.0 mm / s to prepare a plate-shaped extruded material having a thickness of 6 mm and a width of 28 mm.
  • Al and Sc were added to pure Mg (99.9%) to prepare a magnesium-aluminum alloy according to the present invention, Al was added in the form of pure Al pellets having a purity of 99.9%, and Sc was in the form of Mg-2Sc mother alloy. Was added. At this time, pure Al was added to Al to be included in 3, 6, 9% by weight of Al, Mg-2Sc mother alloy was added to include Sc in 0.001, 0.01, 0.1, 1.0% by weight.
  • the composition of the magnesium-aluminum alloy is shown in Table 4 below.
  • Example 10 Mg-3Al 2.91 - - 0.10 0.007 bal.
  • Example 39 Mg-3Al-0.001Sc 2.86 0.001 - 0.05 0.007 bal.
  • Example 40 Mg-3Al-0.01Sc 2.88 0.007 0.002 0.05 0.016 bal.
  • Example 41 Mg-3Al-0.1Sc 2.73 0.099 0.003 0.02 0.054 bal.
  • Example 42 Mg-3Al-1.0Sc 2.36 0.24 0.007 0.05 0.044 bal.
  • Comparative Example 11 Mg-6Al 5.85 0.005 0.01 0.002 bal.
  • Example 43 Mg-6Al-0.001Sc 5.55 0.001 0.003 - 0.004 bal.
  • Example 44 Mg-6Al-0.01Sc 5.81 0.01 0.007 0.009 0.003 bal.
  • Example 45 Mg-6Al-0.1Sc 5.91 0.07 0.003 0.004 0.004 bal.
  • Example 46 Mg-6Al-1.0Sc 5.72 0.17 0.009 - 0.014 bal. Comparative Example 12 Mg-9Al 8.40 - 0.007 0.04 0.036 bal.
  • Example 47 Mg-9Al-0.001Sc 8.84 0.001 0.015 0.05 0.008 bal.
  • Example 48 Mg-9Al-0.01Sc 8.64 0.009 0.002 0.02 0.018 bal.
  • Example 49 Mg-9Al-0.1Sc 8.78 0.086 0.001 - 0.009 bal.
  • Example 50 Mg-9Al-1.0Sc 8.90 0.64 - - 0.017 bal.
  • the raw material thus prepared is charged to a carbon crucible, heated to 700 ° C. or more using an induction melting furnace, dissolved, and then gradually cooled. Billets were prepared.
  • the billets thus prepared were homogenized at 400 ° C. for 24 hours and then processed into billets having a circular cylinder shape of 78 mm in diameter and 140 to 160 mm in length.
  • the billet thus processed was preheated at 300 ° C. for 3 hours and then extruded at a ram speed of 1.0 mm / s to prepare a plate-shaped extruded material having a thickness of 6 mm and a width of 28 mm.
  • the specimen was immersed in a 3.5 wt% NaCl solution (25 ° C.) for 72 hours, and the weight change before and after immersion was measured and converted into a corrosion rate.
  • Pure magnesium has a corrosion rate of 18 mm / y, whereas magnesium with 0.001% by weight of scandium (Mg-0.001Sc) is 2mm / y and magnesium with 0.01% by weight of scandium (Mg-0.01Sc) is 1.7mm / y.
  • magnesium containing 0.05 wt% scandium is 0.25mm / y
  • magnesium containing 0.1 wt% scandium is 0.1mm / y
  • 0.25 wt% magnesium is 0.25mm / y
  • magnesium containing 0.5% by weight of scandium is 0.5mm / y
  • magnesium containing 1.0% by weight of scandium is 0.5mm / y
  • AZ61 was found to be 0.8 mm / y (see Figure 1).
  • the corrosion rate of the magnesium-zinc alloy containing 1 part by weight, 2 parts by weight, 4 parts by weight, and 6 parts by weight of zinc was analyzed, and it contained 0.001, 0.01, 0.1 parts by weight of scandium regardless of the zinc content.
  • the corrosion rate was 8.75 mm / y or less, which was lower than that of the magnesium-zinc alloy ( see FIG. 4) .
  • the corrosion rate was significantly lower.
  • Corrosion rate of magnesium-tin alloy containing 3 parts by weight, 5 parts by weight, 6 parts by weight, and 8 parts by weight of tin was analyzed, and the corrosion rate when 0.001, 0.01, and 0.1 parts by weight of scandium was included regardless of the tin content.
  • the corrosion rate of the magnesium-aluminum alloy containing 3 parts by weight, 6 parts by weight, and 9 parts by weight of aluminum was analyzed. It was found to be significantly lower than the corrosion rate of the magnesium-aluminum alloy below mm / y (see FIG. 16) . Particularly, when 0.1 parts by weight of scandium was included, the corrosion rate was significantly lower.
  • magnesium containing scandium showed better corrosion resistance than pure magnesium, and in particular, it was confirmed that the corrosion resistance was superior to that of the prior art at 0.05 to 0.5% by weight.
  • a commercial material level of purity 99.9% based on Pure Mg
  • high purity material 99.99% based on Pure Mg
  • magnesium containing scandium exhibited better mechanical properties and corrosion resistance than pure magnesium, and in particular, 0.05 to 0.5 parts by weight showed better corrosion resistance than the prior art. According to the present invention, corrosion resistance can be remarkably improved for magnesium not containing scandium.

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Abstract

La présente invention concerne un alliage de magnésium qui possède d'excellentes propriétés mécaniques et de résistance à la corrosion, ainsi qu'un procédé pour le fabriquer. L'alliage de magnésium contient de 0,001 partie en poids à 1,0 partie en poids de scandium pour 100 parties en poids de l'alliage de magnésium, le reste étant du magnésium et les impuretés inévitables et l'alliage de magnésium présentant une limite de solubilité solide de Fe augmentée et une aptitude à la corrosion réduite. La présente invention peut améliorer la résistance à la corrosion d'un alliage de magnésium par l'ajout de scandium, ce qui peut améliorer les propriétés passives d'un revêtement formé sur la surface et inhiber la micro-corrosion galvanique entre une matrice et des impuretés, sans détérioration des propriétés mécaniques. En conséquence, la présente invention fournit un alliage de magnésium qui peut être utile dans divers domaines, tels que des véhicules de transport (tels que des automobiles, des engins ferroviaires, des avions, des bateaux, etc.), des appareils électroménagers, des dispositifs médicaux, des produits nécessaires à la vie quotidienne, etc., squi nécessitent une réduction de poids et une biodégradabilité. En particulier, l'invention permet d'obtenir un alliage de magnésium qui peut être utile dans le domaine des dispositifs médicaux tels que des implants, tels qu'une endoprothèse et une plaque, qui entrent en contact avec le corps.
PCT/KR2016/013959 2015-12-28 2016-11-30 Alliage de magnésium ayant d'excellentes propriétés mécaniques et de résistance à la corrosion et son procédé de fabrication Ceased WO2017116020A1 (fr)

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US16/066,003 US10947609B2 (en) 2015-12-28 2016-11-30 Magnesium alloy having excellent mechanical properties and corrosion resistance and method for manufacturing the same
JP2018531123A JP6710280B2 (ja) 2015-12-28 2016-11-30 機械的特性及び耐蝕性に優れたマグネシウム合金及びその製造方法
CN201680074714.4A CN108431261A (zh) 2015-12-28 2016-11-30 具有优异的机械性能和耐腐蚀性的镁合金及其制造方法
EP16881972.0A EP3399060B1 (fr) 2015-12-28 2016-11-30 Procédé de fabrication d'alliage de magnésium ayant d'excellentes propriétés mécaniques et de résistance à la corrosion

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KR1020160161445A KR101933589B1 (ko) 2015-12-28 2016-11-30 기계적 특성 및 내식성이 우수한 마그네슘 합금 및 이의 제조방법

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CN117778847B (zh) * 2023-10-23 2025-11-14 上海交通大学 一种高导热耐蚀镁合金及其制备方法

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