WO2017020832A1 - 镁制金属构件的电化学抛光方法 - Google Patents

镁制金属构件的电化学抛光方法 Download PDF

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WO2017020832A1
WO2017020832A1 PCT/CN2016/093029 CN2016093029W WO2017020832A1 WO 2017020832 A1 WO2017020832 A1 WO 2017020832A1 CN 2016093029 W CN2016093029 W CN 2016093029W WO 2017020832 A1 WO2017020832 A1 WO 2017020832A1
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magnesium metal
metal member
electrolyte
cathode
anode
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PCT/CN2016/093029
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English (en)
French (fr)
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张无量
赵俊刚
赵海心
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河南通镁新材料科技有限公司
张无量
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Publication of WO2017020832A1 publication Critical patent/WO2017020832A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/18—Polishing of light metals

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  • the invention relates to an electrochemical polishing method, in particular to an electrochemical polishing method for a magnesium metal member.
  • Magnesium metal components have been widely used in transportation, electronic products and implants in recent years due to their light weight, high specific strength, good heat dissipation, good electromagnetic shielding, good impact resistance and good recovery. In the field of sexual medical equipment. In order to ensure that the magnesium metal component can have good quality and finished surface, it is necessary to perform metallographic analysis and surface finishing treatment on the magnesium metal component, and in the metallographic analysis and surface finishing treatment, it is necessary to separately Metallographic test pieces and rough processed products of magnesium metal members are mechanically polished to obtain clear metallographic photographs and finished surfaces, respectively.
  • the object of the present invention is to save time and labor required for polishing a magnesium metal member, and to polish a fine magnesium metal member.
  • the technical means adopted by the present invention is to provide an electrochemical polishing method for a magnesium metal member, the steps of which include:
  • An anode and a cathode are placed in an organomagnesium electrolyte, the anode being a magnesium metal component;
  • the organomagnesium electrolyte comprises a solvent and an organomagnesium electrolyte selected from the group consisting of ethyl ether, tetrahydrofuran, 2-methyl tetrahydrofuran and Cyclopentyl methyl ether, and the organomagnesium electrolyte is selected from the group consisting of methyl magnesium chloride, ethyl magnesium chloride, phenyl magnesium chloride ), alkoxy magnesium bromide and alkoxy magnesium chloride.
  • the molar amount of the organomagnesium electrolyte in the organomagnesium electrolyte is between 1.0 mole and 2.0 mole in the 1 liter (L) organomagnesium electrolyte.
  • the organomagnesium electrolyte contains a supporting electrolyte, and the supporting electrolyte is aluminum chloride.
  • the molar amount of the supporting electrolyte in the 1 L organomagnesium electrolyte is between 0.05 mole and 0.15 mole.
  • the magnesium metal member contains 90.00 weight percent (wt%) or more of magnesium based on the entirety of the magnesium metal member.
  • the magnesium metal member contains 90.00 wt% to 99.00 wt% of magnesium based on the entirety of the magnesium metal member.
  • the cathode is stainless steel, an aluminum member containing 99.90% by weight or more of aluminum, or a tin member containing 99.90% by weight or more of tin.
  • the magnesium metal member as an anode and the cathode are placed in the organomagnesium electrolyte, and the electrolytic voltage is applied between the magnesium metal member as the anode and the cathode to obtain
  • the step of polishing the magnesium metal member further includes the step of covering an inert gas on the surface of the organomagnesium electrolyte.
  • the step of applying the electrolysis voltage between the anode and the cathode to obtain the polished magnesium metal member comprises:
  • the atmospheric pressure is 1 atm.
  • the electrochemical polishing method of the magnesium metal member is to polish the magnesium metal member by electrochemical polishing, which can simultaneously achieve the time and labor required for manual polishing, and fine magnesium.
  • the advantage of polishing metal components is to polish the magnesium metal member by electrochemical polishing, which can simultaneously achieve the time and labor required for manual polishing, and fine magnesium.
  • FIG. 1 is a flow chart of an electrochemical polishing method for a magnesium metal member of the present invention
  • FIG. 2 is a schematic view showing the arrangement of an anode, a cathode, and an electrolyte of an electrochemical polishing method for a magnesium metal member according to Embodiment 1 of the present invention
  • FIG. 3 is an anode, a cathode and an electrolyte of an electrochemical polishing method for a magnesium metal member according to Embodiment 2 of the present invention; Schematic diagram of the configuration;
  • Fig. 4 is a perspective view showing the appearance of a magnesium metal member (anode) of an electrochemical polishing method for a magnesium metal member according to a second embodiment of the present invention.
  • the electrochemical polishing method of the magnesium metal member of the present embodiment is as follows.
  • the magnesium metal member 10 used was a metallographic test piece containing 98% by weight of magnesium.
  • the magnesium metal member 10 is used as an anode, and the magnesium metal member 10 and a cathode 20 are placed in an organic electrolyte 30.
  • the cathode 20 is stainless steel;
  • the organomagnesium electrolyte 30 comprises a solvent, an organic electrolyte and a supporting electrolyte, the solvent is 1 L of tetrahydrofuran, the organic electrolyte is ethyl magnesium chloride, and the supporting electrolyte is chlorine.
  • the cathode 20 comprises There is a first cathode member 21 and a second cathode member 22 electrically connected to the first cathode member 21.
  • the first cathode member 21 and the second cathode member 22 are respectively located at two sides of the magnesium metal member 10.
  • an inert gas is applied to the surface of the organomagnesium electrolyte 30; in the present embodiment, the inert gas is nitrogen.
  • the nitrogen gas is a shielding gas to prevent the organomagnesium electrolyte from being decomposed by exposure to air.
  • step S3 adjusting the electrolysis voltage of a power supply to between 3V and 10V at normal temperature and an operating temperature of 30 ° C, so that the power supply supplies a current density of 25 mA/cm 2 to the anode.
  • a 90 minute period from the cathode 20, a polished magnesium metal member 10 and a reduced metallic magnesium are obtained, wherein the reduced metallic magnesium is located on the surface of the cathode 20.
  • the protruding portion of the surface of the magnesium metal member 10 as the anode is first oxidized and Dissolved in the organic electrolyte 30, the protruding portion of the surface of the metallographic test piece is removed, thereby obtaining a magnesium metal member 10 having a flat surface, that is, the polished magnesium metal member 10.
  • magnesium ions Mg 2+
  • the surface of the cathode 20 forms a reduced magnesium metal which can be recovered for further use.
  • the polishing of the magnesium metal member 10 is performed electrochemically, and the magnesium metal member 10 is uniformly finished in addition to the time and labor required for manual polishing. surface.
  • the electrochemical polishing method of the magnesium metal member of the present embodiment is the same as the electrochemical polishing method of the magnesium metal member of the first embodiment.
  • the difference between this embodiment and Embodiment 1 is as follows.
  • the magnesium metal component 10A is a blood vessel stent, and the blood vessel stent is a cylinder having a mesh cylinder wall, and the blood vessel stent is used as an anode, and
  • the first cathode member 21A of the cathode 20A is disposed inside the magnesium metal member 10A, and the second cathode member 22A of the cathode 20A is sleeved on the outer side of the blood vessel holder.
  • the magnesium metal member 10A is made of a magnesium-tin alloy having a magnesium content of 95% by weight and a tin content of the magnesium-tin alloy of 5% by weight based on the entire magnesium-tin alloy.
  • the magnesium metal member 10A is a cylinder having a mesh cylinder wall, and its shape is rather complicated and fine.
  • the magnesium metal member 10A is polished in an electrochemical manner, and the magnesium metal member 10A having a complicated and fine shape can be polished in addition to the time and labor required for manual polishing. And the magnesium metal member 10A having a complicated and fine shape has a uniform surface.
  • the present invention polishes the magnesium metal member by electrochemical polishing, and at the same time achieves the time and labor required for manual polishing, and is suitable for magnesium metal members having complex and fine shapes and recycling.
  • the advantages of magnesium metal are:

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Materials For Medical Uses (AREA)

Abstract

一种镁制金属构件的电化学抛光方法，其先将一阳极与一阴极放置于一有机镁电解液中，该阳极为镁制金属构件；再施加一电解电压于该阳极与该阴极之间，获得一经抛光的镁制金属构件。该有机镁电解液包含有一选自于乙醚、四氢呋喃、2-甲基四氢呋喃及环戊甲基醚所构成的群组中的溶剂以及一选自于甲基氯化镁、乙基氯化镁、苯基氯化镁、溴化烷氧基镁及氯化烷氧基镁所构成的群组中的有机镁电解质。所述镁制金属构件的电化学抛光方法兼具有省时、省力及适用于具有精细的镁制金属构件的优点。

Description

镁制金属构件的电化学抛光方法 技术领域
本发明涉及一种电化学抛光方法，尤其涉及一种镁制金属构件的电化学抛光方法。
背景技术
镁制金属构件，因具有重量轻、比强度高、散热性佳、电磁遮罩性好、抗冲击性能好和回收性好等特性，于近年来被广泛应用于交通运输、电子产品及植入性医疗器材的领域中。为了能确保镁制金属构件能具有良好的品质及精整的表面，需要对镁制金属构件进行金相分析及表面精整处理，而于进行金相分析及表面精整处理时，需要分别对镁制金属构件的金相试片及粗加工产品进行机械抛光，以分别获得清晰的金相照片及精整的表面。
然而，一般机械抛光是以人工的方式达成，除了相当耗费时间及人力以外，也经常因人工失误而无法使镁制金属构件具有均匀的精整表面。而且机械抛光的方式难以应用于精密且细小的镁制金属构件，举例来说，医疗上所使用的镁合金制的血管支架，其不但尺寸小还具有相当复杂的形状，因此无法通过机械抛光的方式达到表面精整处理的目的。
发明内容
有鉴于上述现有技术的缺点，本发明的目的在于节省镁制金属构件抛光所需耗费的时间及人力，以及对精细的镁制金属构件进行抛光。
为达到前述的发明目的，本发明所采取的技术手段为提供一种镁制金属构件的电化学抛光方法，其步骤包含：
将一阳极与一阴极放置于一有机镁电解液中，该阳极为一镁制金属构件；以及
施加一电解电压于阳极与该阴极之间，获得一经抛光的镁制金属构件；
其中，该有机镁电解液包含有一溶剂及一有机镁电解质，该溶剂选自于下列构成的群组：乙醚(ethyl ether)、四氢呋喃(tetrahydrofuran)、2-甲基四氢呋喃(2-methyl tetrahydrofuran)及环戊甲基醚(cyclopentyl methyl ether)，且该有机镁电解质选自于下列构成的群组：甲基氯化镁(methyl magnesium chloride)、乙基氯化镁(ethyl magnesium chloride)、苯基氯化镁(phenyl magnesium chloride)、溴化烷氧基镁(alkoxy magnesium bromide)及氯化烷氧基镁(alkoxy magnesium chloride)。
较佳的是，于1公升(L)的有机镁电解液中，该有机镁电解液中有机镁电解质的摩尔数介于1.0摩尔(mole)至2.0mole之间。
较佳的是，该有机镁电解液包含有一支持电解质，该支持电解质为氯化铝。
更佳的是，于1L的有机镁电解液中，该支持电解质的摩尔数介于0.05mole至0.15mole之间。
较佳的是，以该镁制金属构件的整体为基准，该镁制金属构件含有90.00重量百分比(wt％)以上的镁。
更佳的是，以该镁制金属构件的整体为基准，该镁制金属构件含有90.00wt％至99.00wt％的镁。
该阴极为不锈钢(stainless steel)、含有99.90wt％以上的铝的铝构件或含有99.90wt％以上的锡的锡构件。
较佳的是，于将该作为阳极的镁制金属构件与该阴极放置于该有机镁电解液中的步骤，与施加该电解电压于该作为阳极的镁制金属构件与该阴极之间以获得该经抛光的镁制金属构件的步骤之间，进一步包含有覆盖一惰性气体于该有机镁电解液的表面的步骤。
较佳的是，所述施加该电解电压于该阳极与该阴极之间，以获得该经抛光的镁制金属构件的步骤包含：
于常压及30℃至40℃的工作温度下，施加该电解电压及25毫安培/平方公分(mA/cm2)至50mA/cm2的电流密度[通过将该电解电压调节为3伏特(V)至10V之电解电压]于该阳极与该阴极之间，以获得该经抛光的镁制金属构件以及一还原的金属镁的步骤。
于所述制备金属镁的方法中，所述常压为1大气压(atm)。
基于上述，所述镁制金属构件的电化学抛光方法是以电化学抛光方式对镁制金属构件进行抛光，能同时达成省却以人工进行抛光所需耗费的时间与人力，以及对精细的镁制金属构件进行抛光的优点。
附图说明
图1为本发明的镁制金属构件的电化学抛光方法的流程图；
图2为本发明的实施例1的镁制金属构件的电化学抛光方法的阳极、阴极及电解液的配置示意图；
图3为本发明的实施例2的镁制金属构件的电化学抛光方法的阳极、阴极及电解液 的配置示意图；
图4为本发明的实施例2的镁制金属构件的电化学抛光方法的镁制金属构件(阳极)的立体外观示意图。
具体实施方式
以下，将藉由下列具体实施例详细说明本发明的实施方式，所属领域技术人员可经由本说明书的内容轻易地了解本发明所能达成的优点与功效，并且于不悖离本发明的精神下进行各种修饰与变更，以施行或应用本发明的内容。
实施例1
请参阅图1及图2，本实施例的镁制金属构件的电化学抛光方法如下所述。于本实施例中，所使用的镁制金属构件10为一含有98wt％的镁的金相试片。
首先，如步骤S1所述，以该镁制金属构件10作为阳极，并将该镁制金属构件10与一阴极20放置于一有机电解液30中。于本实施例中，该阴极20为不锈钢；该有机镁电解液30包含有一溶剂、一有机电解质及一支持电解质，该溶剂为1L的四氢呋喃，该有机电解质为乙基氯化镁，该支持电解质为氯化铝；其中，于1L的有机镁电解液30中，该有机电解液30中有机镁电解质的摩尔数为1.5mole且该支持电解质的摩尔数浓度为0.1mole；进一步而言，该阴极20包含有一第一阴极件21及一与该第一阴极件21电连接的第二阴极件22，该第一阴极件21及该第二阴极件22分别位于该镁制金属构件10的两侧。
接着，如步骤S2所述，将一惰性气体覆盖于该有机镁电解液30的表面；于本实施例中，该惰性气体为氮气。该氮气为保护气体，以防止有机镁电解液暴露在空气中被分解。
之后，如步骤S3所述，于常压及30℃的工作温度下，调节一电源供应器的电解电压于3V至10V之间，令该电源供应器提供25mA/cm2的电流密度于该阳极与该阴极20之间90分钟，获得一经抛光的镁制金属构件10以及一还原的金属镁，其中，该还原的金属镁位于该阴极20的表面上。
于本实施例的镁制金属构件的电化学抛光方法中，当电解电压施加于该阳极与该阴极20之间时，该作为阳极的镁制金属构件10的表面的突出部位会被首先氧化并溶解于该有机电解液30中，从而使得金相试片的表面的突出部位被清除，进而获得一具有平整表面的镁制金属构件10，即，该经抛光的镁制金属构件10。其中，该镁制金属构件 10的表面的突出部位会被氧化并溶解时，会释放出镁离子(Mg2+)于该有机电解液30中，该镁离子会往该阴极20移动，并于该阴极20的表面形成还原的镁金属，从而可回收以进一步利用。
于本实施例中，该镁制金属构件10的抛光是以电化学的方式完成，除了省却以人工进行抛光所需耗费的时间及人力以外，还使该镁制金属构件10具有均匀的精整表面。
实施例2
本实施例的镁制金属构件的电化学抛光方法与实施例1的镁制金属构件的电化学抛光方法概同。本实施例与实施例1之间的不同处如下所述。
请参阅图3及图4所示，于本实施例中，该镁制金属构件10A为一血管支架，该血管支架为一具有网状筒壁的筒体，并以该血管支架作为阳极，且该阴极20A的第一阴极件21A穿设于该镁制金属构件10A的内侧，该阴极20A的第二阴极件22A套设于该血管支架的外侧。其中，该镁制金属构件10A是由镁锡合金所制，以该镁锡合金的整体为基准，该镁锡合金的镁含量为95wt％，该镁锡合金的锡含量为5wt％。
于本实施例中，该镁制金属构件10A为具有网状筒壁的筒体，其形状相当复杂且精细。本实施例以电化学的方式对该镁制金属构件10A进行抛光，除了省却以人工进行抛光所需耗费的时间及人力以外，还能对该具有复杂且精细形状的镁制金属构件10A进行抛光，并使该具有复杂且精细形状的镁制金属构件10A具有均匀的表面。
基于上述，本发明藉由以电化学抛光方式对镁制金属构件进行抛光，同时能达成省却以人工进行抛光所需耗费的时间与人力、适用于具有复杂且精细形状的镁制金属构件以及回收镁金属的优点。
以上所述仅是本发明的较佳实施例而已，并非对本发明做任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何熟悉本领域的技术人员，在不脱离本发明技术方案的范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。

Claims (9)

  1. 一种镁制金属构件的电化学抛光方法，其特征在于，其包含有下列步骤：
    将一阳极与一阴极放置于一有机镁电解液中，该阳极为一镁制金属构件；以及
    施加一电解电压于该阳极与该阴极之间，以获得一经抛光的镁制金属构件；
    其中，该有机镁电解液包含有一溶剂及一有机镁电解质，该溶剂选自于下列构成的群组：乙醚、四氢呋喃、2-甲基四氢呋喃及环戊甲基醚，且该有机镁电解质选自于下列构成的群组：甲基氯化镁、乙基氯化镁、苯基氯化镁、溴化烷氧基镁及氯化烷氧基镁。
  2. 根据权利要求1所述的镁制金属构件的电化学抛光方法，其特征在于：该有机镁电解液包含有一支持电解质，该支持电解质为氯化铝。
  3. 根据权利要求2所述的镁制金属构件的电化学抛光方法，其特征在于：于1L的有机电解液中，该有机镁电解液中有机镁电解质的摩尔数介于1.0mol至2.0mol之间，且该有机电解液中支持电解质的摩尔数介于0.05mol至0.15mol之间。
  4. 根据权利要求1至3中任一项所述的镁制金属构件的电化学抛光方法，其特征在于：以该镁制金属构件的整体为基准，该镁制金属构件含有90.00wt％以上的镁。
  5. 根据权利要求4所述的镁制金属构件的电化学抛光方法，其特征在于：该阴极为不锈钢、含有99.90wt％以上的铝的铝构件或含有99.90wt％以上的锡的锡构件。
  6. 根据权利要求1至3中任一项所述的镁制金属构件的电化学抛光方法，其特征在于：于将该阳极与阴极放置于该有机镁电解液中的步骤以及于施加该电解电压于该阳极与该阴极之间以获得该经抛光的镁制金属构件的步骤之间包含：覆盖一惰性气体于该有机镁电解液的表面的步骤。
  7. 根据权利要求5所述的镁制金属构件的电化学抛光方法，其特征在于：于将该阳极与阴极放置于该有机镁电解液中的步骤以及于施加该电解电压于该阳极与该阴极之间以获得该经抛光的镁制金属构件的步骤之间包含：覆盖一惰性气体于该有机镁电解液的表面的步骤。
  8. 根据权利要求1至3中任一项所述的镁制金属构件的电化学抛光方法，其特征在于：所述施加该电解电压于该阳极与该阴极之间，以获得该经抛光的镁制金属构件的步骤包含：
    于常压及30℃至40℃的工作温度下，施加该电解电压及25mA/cm2至50 mA/cm2的电流密度于该阳极与该阴极之间，以获得该经抛光的镁制金属构件以及一还原的金属镁的步骤。
  9. 根据权利要求7所述的镁制金属构件的电化学抛光方法，其特征在于：所述施加该电解电压于该阳极与该阴极之间，以获得该经抛光的镁制金属构件的步骤包含：
    于常压及30℃至40℃的工作温度下，施加该电解电压及25mA/cm2至50mA/cm2的电流密度于该阳极与该阴极之间，以获得该经抛光的镁制金属构件以及一还原的金属镁的步骤。
PCT/CN2016/093029 2015-08-04 2016-08-03 镁制金属构件的电化学抛光方法 WO2017020832A1 (zh)

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