CN110760772A - 一种镁合金熔炼的中碳钢坩埚表面除铁工艺 - Google Patents
一种镁合金熔炼的中碳钢坩埚表面除铁工艺 Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910000954 Medium-carbon steel Inorganic materials 0.000 title claims abstract description 49
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 18
- 238000003723 Smelting Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000008569 process Effects 0.000 title claims abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 16
- 239000011777 magnesium Substances 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000003618 dip coating Methods 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
本发明公开了一种镁合金熔炼的中碳钢坩埚表面除铁工艺,包括以下步骤:S1:表面清理,取两个品质相同的中碳钢坩埚,并记为中碳钢坩埚A和中碳钢坩埚B,用200目砂纸分别将中碳钢坩埚A和中碳钢坩埚B的内表面的氧化皮打磨掉,然后用酒精清洗表面;S2:热镀,将中碳钢坩埚A放入电阻炉中,然后倒入预先熔化好的Mg‑4wt.%Mn的镁合金,通过气体保护,在800℃下保温20min,在中碳钢坩埚A的内壁热镀上厚度20μm的Mn层,然后将镁熔体倒出;S3:熔炼,向中碳钢坩埚A和中碳钢坩埚B中分别将纯镁在700℃下熔化,保温60min后熔体在坩埚中自然冷却。本发明中热镀Mn层后铁含量大大降低了,可以有效的阻碍了铁坩埚中的杂质元素Fe向镁熔体中扩散,提高了镁合金的纯度。
Description
技术领域
本发明涉及镁合金的熔炼技术领域,尤其涉及一种镁合金熔炼的中碳钢坩埚表面除铁工艺。
背景技术
镁合金作为目前工业应用中最轻的工程金属结构材料,具有密度小、比强度比刚度高、阻尼减振能力强、铸造性能优越、切削加工性能好、能屏蔽电磁辐射和易于回收利用等优点,在汽车、轨道车辆、 3C产品、航空航天、国防军工等领域具有重要的应用价值和广阔的应用前景。
但是,目前镁合金存在绝对强度低、加工成形困难、耐腐蚀性能差等问题,很大程度上限制了镁合金产品的在实际工程中的应用。为解决上述问题,近年来,人们在合金化、热处理、晶粒细化、变形工艺等方面做了大量的研究工作,并取得了重要进展。除此之外,镁合金的纯度也是影响镁合金耐腐蚀性能的最重要因素之一,尤其镁合金中Fe、Si、Ni、Cu等有害杂质元素的含量。研究表明,有害杂质元素的存大大降低镁合金铸锭的品质,会严重影响镁合金材料的组织状态、耐腐蚀性能、机械性能和加工成形性能,而且在镁合金的这些金属杂质中,Fe是危害最大的杂质元素。因为杂质元素Fe很容易通过原材料、熔剂和熔炼工具等带入镁熔体中因此,纯净的镁熔体是获得综合性能良好的优质镁合金材料的基本前提。研究和开发镁合金熔体纯化技术,有效地降低镁合金铸坯中杂质元素Fe的含量刻不容缓。现今,镁合金熔炼中通常采用B、Ti、Zr、Be、Mn等元素的单质或化合物作为熔剂以达到除Fe的目的。但是这些熔剂在除Fe的同时会引入新的杂质或夹杂,这会对熔体的纯度和镁合金材料的整体性能造成不利影响。有鉴于此,十分有必要开发一种镁合金熔炼的中碳钢坩埚表面除铁工艺,这对提高镁合金的品质和扩大镁合金材料的工程应用具有重要的意义。
发明内容
本发明的目的是为了解决现有技术中存在的缺点,而提出的一种镁合金熔炼的中碳钢坩埚表面除铁工艺。
为了实现上述目的,本发明采用了如下技术方案:
一种镁合金熔炼的中碳钢坩埚表面除铁工艺,包括以下步骤:
S1:表面清理,取两个品质相同的中碳钢坩埚,并记为中碳钢坩埚A和中碳钢坩埚B,用200目砂纸分别将中碳钢坩埚A和中碳钢坩埚B的内表面的氧化皮打磨掉,然后用酒精清洗表面;
S2:热镀,将中碳钢坩埚A放入电阻炉中,然后倒入预先熔化好的Mg-4wt.%Mn的镁合金,通过气体保护,在800℃下保温20min,在中碳钢坩埚A的内壁热镀上厚度20μm的Mn层,然后将镁熔体倒出;
S3:熔炼,向中碳钢坩埚A和中碳钢坩埚B中分别将纯镁在700℃下熔化,保温60min后熔体在坩埚中自然冷却;
S4:Fe元素的测定,在纯镁铸锭边缘和中心分别取样,利用原子发射光谱仪对样品中的Fe元素含量进行测定。
优选的,所述步骤S2中的保护气体是CO2+SF6。
与现有技术相比,本发明的有益效果是:
本发明中热镀Mn层后铁含量大大降低了,可以有效的阻碍了铁坩埚中的杂质元素Fe向镁熔体中扩散,提高了镁合金的纯度。
附图说明
图1为本发明提出的一种镁合金熔炼的中碳钢坩埚表面除铁工艺的测定结果数据表。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。
参照图1,一种镁合金熔炼的中碳钢坩埚表面除铁工艺,包括以下步骤:
S1:表面清理,取两个品质相同的中碳钢坩埚,并记为中碳钢坩埚A和中碳钢坩埚B,用200目砂纸分别将中碳钢坩埚A和中碳钢坩埚B的内表面的氧化皮打磨掉,然后用酒精清洗表面;
S2:热镀,将中碳钢坩埚A放入电阻炉中,然后倒入预先熔化好的Mg-4wt.%Mn的镁合金,通过气体保护,在800℃下保温20min,在中碳钢坩埚A的内壁热镀上厚度20μm的Mn层,然后将镁熔体倒出;
S3:熔炼,向中碳钢坩埚A和中碳钢坩埚B中分别将纯镁在700℃下熔化,保温60min后熔体在坩埚中自然冷却;
S4:Fe元素的测定,在纯镁铸锭边缘和中心分别取样,利用原子发射光谱仪对样品中的Fe元素含量进行测定。
其中,步骤S2中的保护气体是CO2+SF6。
由图1的测定结果,本发明中,没有热镀Mn层的中碳钢坩埚B 中铸锭边缘的Fe含量/ppm为329,铸锭中心的Fe含量/ppm为159;热镀Mn层的中碳钢坩埚B中铸锭边缘的Fe含量/ppm为40,铸锭中心的Fe含量/ppm为38。显然,热镀Mn层后铁含量大大降低了,可以有效的阻碍了铁坩埚中的杂质元素Fe向镁熔体中扩散,提高了镁合金的纯度。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (2)
1.一种镁合金熔炼的中碳钢坩埚表面除铁工艺,其特征在于,包括以下步骤:
S1:表面清理,取两个品质相同的中碳钢坩埚,并记为中碳钢坩埚A和中碳钢坩埚B,用200目砂纸分别将中碳钢坩埚A和中碳钢坩埚B的内表面的氧化皮打磨掉,然后用酒精清洗表面;
S2:热镀,将中碳钢坩埚A放入电阻炉中,然后倒入预先熔化好的Mg-4wt.%Mn的镁合金,通过气体保护,在800℃下保温20min,在中碳钢坩埚A的内壁热镀上厚度20μm的Mn层,然后将镁熔体倒出;
S3:熔炼,向中碳钢坩埚A和中碳钢坩埚B中分别将纯镁在700℃下熔化,保温60min后熔体在坩埚中自然冷却;
S4:Fe元素的测定,在纯镁铸锭边缘和中心分别取样,利用原子发射光谱仪对样品中的Fe元素含量进行测定。
2.根据权利要求1所述的一种镁合金熔炼的中碳钢坩埚表面除铁工艺,其特征在于,所述步骤S2中的保护气体是CO2+SF6。
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戴甲洪: ""合金元素在镁合金中扩散行为的研究"", 《中国博士学位论文全文数据库 工程科技Ⅰ辑(月刊)》 * |
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