WO2014203919A1 - マグネシウム合金製品の製造方法 - Google Patents
マグネシウム合金製品の製造方法 Download PDFInfo
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- WO2014203919A1 WO2014203919A1 PCT/JP2014/066102 JP2014066102W WO2014203919A1 WO 2014203919 A1 WO2014203919 A1 WO 2014203919A1 JP 2014066102 W JP2014066102 W JP 2014066102W WO 2014203919 A1 WO2014203919 A1 WO 2014203919A1
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- magnesium alloy
- aqueous solution
- weight
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- magnesium
- Prior art date
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Classifications
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/22—Acidic compositions for etching magnesium or alloys thereof
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
Definitions
- the present invention relates to a method for producing a magnesium alloy product having an anodized film formed on the surface.
- Magnesium alloy is the lightest metal among practical metals and has good heat dissipation. Therefore, the demand is increasing in the industrial field where weight reduction is required. However, since magnesium alloys show an electrochemically low potential among practical metals and are easily corroded, surface treatment with corrosion resistance is necessary.
- anodization treatment called Dow17 method or HAE method is typically known.
- Excellent corrosion resistance can be imparted by anodizing the magnesium alloy.
- Patent Document 1 is characterized by immersing magnesium or a magnesium alloy in an electrolyte solution containing 0.1 to 1 mol / L of a phosphate group and having a pH of 9 to 13, and anodizing the surface thereof.
- a method for producing a product made of magnesium or a magnesium alloy having an anodized film on its surface is disclosed.
- the anodic oxide film obtained by this method has excellent corrosion resistance and is characterized by not containing heavy metal elements.
- Patent Document 2 describes a magnesium alloy composed of 6 to 16% by weight of lithium and the balance being magnesium and inevitable impurities. And it is described that this magnesium alloy can be widely used for home appliances, OA equipment case parts, multimedia equipment cases, mechanism parts, aerospace-related parts, and automobile parts.
- anodizing treatment is performed in order to improve the corrosion resistance.
- the present situation is that an anodic oxide film having sufficient corrosion resistance has not been obtained in a magnesium alloy containing lithium.
- Patent Document 3 discloses that a magnesium alloy surface has an electrolyte solution in an electrolyte solution having a carbonate concentration of 0.05 to 0.19 mol / L and a phosphate concentration of 0.005 to 0.15 mol / L.
- a magnesium alloy surface treatment method is described in which anodization is performed at a temperature of 50 to 95 ° C. and an electrolysis voltage of 40 to 150 V for 30 seconds to 20 minutes.
- an example in which the surface of the Mg—Li alloy is anodized is described.
- the corrosion resistance of the anodized film obtained by the surface treatment method described in Patent Document 3 has not been sufficient yet.
- the present invention has been made to solve the above problems, and provides a method for producing a magnesium alloy product capable of forming an anodized film excellent in corrosion resistance on the surface of a magnesium alloy containing lithium by a simple method. provide.
- An object of the present invention is to produce a magnesium alloy product characterized in that the surface of a magnesium alloy containing lithium is treated with an aqueous solution containing hydrogen fluoride and then anodized to form an anodized film on the surface. Solved by providing a method.
- the magnesium alloy preferably contains 80 to 95% by weight of magnesium and 5 to 20% by weight of lithium.
- the aqueous solution contains 0.5 to 10 mol / L of hydrogen fluoride and has a pH of 1 to 5. It is also preferable to anodize in an electrolytic solution containing 0.1 to 1 mol / L of phosphate radicals and having a pH of 8 to 14. It is also preferable that the electrolytic solution contains 0.2 to 5 mol / L of ammonia or ammonium ions.
- the thickness of the anodized film is preferably 0.1 to 50 ⁇ m.
- an anodized film having excellent corrosion resistance can be formed on the surface of a magnesium alloy containing lithium by a simple method.
- the present invention provides a magnesium alloy product characterized in that a surface of a magnesium alloy containing lithium is treated with an aqueous solution containing hydrogen fluoride and then anodized to form an anodized film on the surface. Is the method.
- the greatest feature of the present invention is that the surface of the magnesium alloy containing lithium is treated with an aqueous solution containing hydrogen fluoride before the anodizing treatment.
- the present inventors have found that the corrosion resistance of the anodized film formed on the surface of the magnesium alloy is improved by treating the surface of the magnesium alloy containing lithium with an aqueous solution containing hydrogen fluoride. .
- the magnesium alloy used in the present invention examples include an Mg—Li alloy, an Mg—Li—Al alloy, an Mg—Li—Zn alloy, and the like.
- the magnesium alloy used in the present invention preferably contains 80 to 95% by weight of magnesium and 5 to 20% by weight of lithium from the viewpoint of lightness. If the lithium content is less than 5% by weight, it is not preferable from the viewpoint of lightness. The lithium content is more preferably 7% by weight or more. On the other hand, if the lithium content exceeds 20% by weight, the strength and corrosion resistance of the alloy may be reduced. The lithium content is more preferably 18% by weight or less.
- the magnesium alloy used in the present invention more preferably contains 82% by weight or more of magnesium. The magnesium content is more preferably 93% by weight or less.
- the magnesium alloy used in the present invention may contain elements other than magnesium and lithium, but from the viewpoint of weight reduction, the total content is preferably 10% by weight or less, and 5% by weight or less. More preferably, it is more preferably 2% by weight or less.
- aluminum may be contained in order to improve the corrosion resistance, and the content in this case is preferably 0.5% by weight or more.
- the aluminum content is preferably 5% by weight or less, and more preferably 2% by weight or less.
- zinc may be contained, and the content in this case is preferably 0.5% by weight or more.
- the zinc content is preferably 5% by weight or less, and more preferably 2% by weight or less.
- the form of the magnesium alloy subjected to the treatment with the aqueous solution containing hydrogen fluoride is not particularly limited.
- a molded product formed by a press molding method, a forging method, a thixo mold method, a die casting method, or the like can be used.
- Such a molded article may have dirt on the surface, which may be caused by organic matter such as a mold release agent made of a silicone compound, which is attached during molding, and therefore is preferably subjected to a degreasing treatment.
- an aqueous solution containing a surfactant or a chelating agent is preferably used as the liquid for degreasing.
- aqueous solution containing hydrogen fluoride it is immersed in an acidic aqueous solution and then subjected to treatment with an aqueous solution containing hydrogen fluoride.
- an acidic aqueous solution By dipping in an acidic aqueous solution, the surface of the alloy can be appropriately etched to remove an insufficiently formed oxide film and remaining organic contaminants.
- acidic aqueous solution Phosphoric acid aqueous solution has moderate acidity, and is suitable.
- magnesium phosphate may be formed on the surface simultaneously with etching.
- a degreasing treatment can be performed simultaneously by mixing a surfactant or a chelating agent with an acidic aqueous solution. After the degreasing treatment and the acidic aqueous solution treatment, washing and drying may be performed as necessary.
- the magnesium alloy is treated with an aqueous solution containing hydrogen fluoride through, for example, the above degreasing treatment or acidic aqueous solution treatment.
- the aqueous solution preferably contains 0.5 to 10 mol / L of hydrogen fluoride. If the concentration of hydrogen fluoride in the aqueous solution is less than 0.5 mol / L, the corrosion resistance of the anodized film formed on the surface of the magnesium alloy may not be improved after treatment with the aqueous solution containing hydrogen fluoride. On the other hand, when the concentration of hydrogen fluoride in the aqueous solution exceeds 10 mol / L, the handleability may be inferior or the processing cost may increase.
- the aqueous solution has a pH of 1 to 5.
- the pH of the aqueous solution exceeds 5, the corrosion resistance of the anodic oxide film formed on the surface of the magnesium alloy may not be improved after the treatment with the aqueous solution containing hydrogen fluoride.
- the magnesium alloy is preferably treated by being immersed in the aqueous solution containing hydrogen fluoride.
- the temperature of the aqueous solution is usually 0 to 60 ° C.
- the aqueous solution can be obtained by diluting commercially available hydrofluoric acid. Moreover, this aqueous solution should just have the density
- the magnesium alloy may be washed with an alkaline aqueous solution before the anodizing treatment. Thereby, it is possible to remove the smut adhering to the surface of the magnesium alloy.
- an alkaline aqueous solution an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution is preferably used.
- the pretreated alloy is immersed in an electrolytic solution and anodized.
- the anodizing method in the present invention is not particularly limited, and an anodizing method by a conventional typical anodizing method such as the Dow 17 method or the HAE method is also possible.
- the electrolytic solution used in the anodizing treatment contains substantially no heavy metal element.
- the heavy metal element means a metal element having a specific gravity of more than 4 as a simple substance, and chromium, manganese and the like are exemplified as those contained in a typical electrolyte solution in a conventional anodizing treatment.
- the electrolytic solution of the present invention does not contain a fluorine element. Therefore, an alkaline aqueous solution containing a phosphate group is preferable as the electrolytic solution used in the anodizing treatment of the present invention.
- the electrolytic solution contains a phosphate group, phosphorus element is included in the anodized film. Moreover, unnecessary elution of the alloy can be prevented by making the electrolytic solution alkaline. Furthermore, since this electrolytic solution does not substantially contain heavy metal elements, drainage management is easy, and the obtained anodic oxide film is also preferable because it does not contain heavy metals.
- the electrolytic solution is preferably an aqueous solution containing 0.1 to 1 mol / L of a phosphate group and having a pH of 8 to 14.
- the phosphate group here is one included in the electrolyte as free phosphoric acid, phosphate, hydrogen phosphate, or dihydrogen phosphate.
- the phosphoric acid radicals are contained by the number of phosphate radicals obtained by hydrolysis thereof.
- a salt it may be a metal salt or a non-metallic salt such as an ammonium salt.
- the content of phosphate radicals is more preferably 0.15 mol / L or more. Further, the phosphate group content is more preferably 0.7 mol / L or less.
- the pH of the electrolytic solution is more preferably 10 or more. Moreover, it is 12 or less more suitably.
- the electrolytic solution contains ammonia or ammonium ions in a total amount of 0.2 to 5 mol / L.
- the pH of the electrolytic solution is maintained at an appropriate alkalinity.
- the content of ammonia or ammonium ions is more preferably 0.5 mol / L or more. Moreover, it is 3 mol / L or less more suitably.
- the power supply to be used is not particularly limited, and can be used with either a DC power supply or an AC power supply. Further, when using a DC power supply, either a constant current power supply or a constant voltage power supply may be used.
- a cathode material is not specifically limited, For example, a stainless steel material etc. can be used conveniently.
- the surface area of the cathode is preferably larger than the surface area of the alloy to be anodized, more preferably 2 times or more, and usually 10 times or less.
- the current density on the anode surface is usually 0.1 to 10 A / dm 2 .
- the current density on the anode surface is usually 0.1 to 10 A / dm 2 .
- it is 0.2 A / dm 2 or more.
- it is preferably 6 A / dm 2 or less.
- the energization time is usually 10 to 1000 seconds.
- it is 20 seconds or more.
- it is 500 seconds or less suitably.
- the applied voltage at the end of energization is usually 50 to 600 volts.
- it is 100 volts or more.
- the applied voltage is often set to less than 100 volts, whereas in the anodizing process using an alkaline electrolyte containing a phosphate group, It is preferable to set a high voltage.
- the oxidation reaction easily proceeds even in a portion containing impurities such as a silicone release agent, and a film having good conductivity is easily formed on the entire surface of the magnesium alloy.
- the temperature of the electrolyte during energization is usually 5 to 70 ° C. It is preferably 10 ° C or higher. Moreover, it is 50 degrees C or less suitably.
- the electrolyte adhered to the surface of the anodized film is removed by washing the alloy.
- an acidic aqueous solution may be used.
- the acidic aqueous solution nitric acid aqueous solution, hydrochloric acid aqueous solution, sulfuric acid aqueous solution and the like can be used. After washing, drying is performed to obtain a magnesium alloy product having an anodized film on the surface.
- the film thickness of the anodized film is preferably 0.1 to 50 ⁇ m. More preferably, it is 0.5 ⁇ m or more, and further preferably 1 ⁇ m or more. Further, it is more preferably 30 ⁇ m or less, and further preferably 20 ⁇ m or less.
- the corrosion resistance improves as the thickness of the anodized film increases, but if it is too thick, the surface roughness may increase and the manufacturing cost may increase.
- the alloy product in which the anodized film is formed on the surface of the magnesium alloy containing lithium is light and excellent in corrosion resistance. Therefore, such an alloy product is particularly expected as a material for a casing of a portable electronic device such as a mobile phone or a personal computer.
- test method in this example was performed according to the following method.
- Example 1 A rolled plate (170 mm ⁇ 50 mm ⁇ 0.3 mm size) made of a magnesium alloy consisting of 85 wt% magnesium, 14 wt% lithium and 1 wt% aluminum was used as a test piece.
- Pretreatment 1 As pretreatment 1, the test piece was immersed in an acidic aqueous solution at 65 ° C. containing 0.25 mol / L phosphoric acid and a trace amount of a surfactant for 60 seconds and washed with ion-exchanged water.
- Pretreatment 2 As pretreatment 2, the test piece was immersed in an aqueous solution of hydrogen fluoride at 25 ° C. of 3.2 mol / L and pH 2 for 60 seconds and washed with ion-exchanged water.
- Pretreatment 3 As pretreatment 3, the test piece was immersed in a 3.8 mol / L 80 ° C. sodium hydroxide aqueous solution for 60 seconds and washed with ion-exchanged water.
- a constant current power source was used and current was supplied for 180 seconds so that the current density on the anode surface was 3 A / dm 2 .
- the applied voltage was low at the start of energization, it increased to about 300 volts at the end of energization. After energization, it was washed with ion exchange water and then dried.
- the film thickness of this anodized film was about 3 ⁇ m.
- the film thickness referred to here is an average distance from the surface of the thick part to the alloy surface of the base material in the film having local film thickness unevenness due to a large number of holes (described below). The film thickness is also the same).
- Comparative Example 1 In Comparative Example 1, the same process as in Example 1 was performed except that the pretreatment 2 of Example 1 was not performed. The thickness of this anodic oxide film was about 1 ⁇ m. When the obtained test piece was subjected to a salt spray test, corrosion was observed on the entire surface of the test piece. The results are shown in Table 1.
- Reference example 1 In Reference Example 1, the pretreatment and film formation process of Example 1 were performed using the test pieces described below. This reference example does not constitute an embodiment of the present invention, but is useful for understanding the structure of the present invention.
- the chemical composition of the anodized film was analyzed from the cross-sectional direction of the film using an X-ray microanalyzer “JXA-8500FS” manufactured by JEOL Ltd. Measurements were taken at two locations for each sample. The measurement was performed under the conditions of an acceleration voltage of 15 kV and a sample irradiation current of 2 ⁇ 10 ⁇ 8 A. Data analysis was performed by ZAF correction.
- ASTM No. consisting of 90% magnesium, 9% aluminum and 1% zinc.
- a magnesium alloy of AZ91D was used as a raw material, and an alloy plate (size of 170 mm ⁇ 50 mm ⁇ 2 mm cast by a hot chamber method) was used as a test piece.
- the same pre-processing and the same film-forming process as Example 1 were performed with respect to the said test piece, and the anodic oxide film was formed.
- the film thickness of this anodized film was about 10 ⁇ m.
- the obtained anodized film contained 23.8% by weight of magnesium element, 48.2% by weight of oxygen element, 25.0% by weight of phosphorus element, and 2.9% by weight of aluminum element.
- Reference example 2 In Reference Example 2, the same treatment as in Reference Example 1 was performed except that Pretreatment 2 was not performed in Reference Example 1.
- the film thickness of this anodized film was about 10 ⁇ m.
- the obtained anodized film contained 24.0% by weight of magnesium element, 47.6% by weight of oxygen element, 25.6% by weight of phosphorus element, and 2.8% by weight of aluminum element.
- Example 1 of Table 1 it was found that when anodization was performed after treatment with an aqueous solution containing hydrogen fluoride, an anodized film having excellent corrosion resistance was formed. In contrast, the anodized film obtained in Comparative Example 1 that was anodized without being treated with an aqueous solution containing hydrogen fluoride had insufficient corrosion resistance.
Abstract
Description
試験片を5mm×10mmの寸法に切断し、エポキシ樹脂に包埋してから、切断面を研磨して鏡面を得た。試料の断面方向から、日本電子株式会社製X線マイクロアナライザー「JXA-8500FS」を用いて電子顕微鏡写真を撮影し、膜厚を測定した。
JIS Z 2371に準拠して、試験片に対して5%塩水噴霧試験を120時間行った。120時間経過後、試験片を取り出して腐食の有無を肉眼で観察した。そして、試験片が全く腐食していなかった場合をA、試験片の一部が腐食していた場合をB、試験片の全面が腐食していた場合をCとする、A、B、Cの3段階評価を行った。
[試験片]
マグネシウム85重量%、リチウム14重量%、アルミニウム1重量%からなるマグネシウム合金を原料とした圧延板(170mm×50mm×0.3mmの寸法)を試験片として使用した。
前処理1として、上記試験片を、0.25mol/Lのリン酸と微量の界面活性剤を含有する65℃の酸性水溶液に60秒浸漬し、イオン交換水で洗浄した。
前処理2として、上記試験片を、3.2mol/L、pH2の25℃のフッ化水素水溶液に60秒浸漬し、イオン交換水で洗浄した。
前処理3として、上記試験片を、3.8mol/Lの80℃の水酸化ナトリウム水溶液に60秒浸漬し、イオン交換水で洗浄した。
上記前処理1~3の後、以下の条件で成膜処理を行った。リン酸水溶液とアンモニア水とを混合して、リン酸根を0.25mol/L、アンモニア又はアンモニウムイオンをその合計量で1.5mol/L含有する電解液を調製し、15℃に保った。この電解液のpHは10.5であった。この中に上記の前処理を施した試験片を陽極として浸漬して、陽極酸化処理を行った。このときの陰極としては、上記陽極の4倍の表面積を有するSUS316Lの板を使用した。定電流電源を使用し陽極表面の電流密度が3A/dm2となるようにして180秒間通電した。通電開始時には低い印加電圧であったのが、通電終了時には約300ボルトまで上昇した。通電終了後、イオン交換水で洗浄してから乾燥した。
比較例1では、実施例1の前処理2を行わなかった以外は実施例1と同じ処理を行った。この陽極酸化皮膜の膜厚は約1μmであった。得られた試験片を塩水噴霧試験に供したところ、試験片の全面に腐食が観察された。結果を表1に示す。
参考例1では、以下に説明する試験片を用いて、実施例1の前処理及び成膜処理を行った。本参考例は本発明の実施例を構成するものではないが、本発明の構成を理解するのに有用なものである。陽極酸化皮膜の化学組成分析は、日本電子株式会社製X線マイクロアナライザー「JXA-8500FS」を用いて、皮膜の断面方向から分析を行った。試料ごとに2ヶ所ずつ測定を行った。測定は、加速電圧15kV、試料照射電流2×10-8Aの条件で行った。データ解析は、ZAF補正によって行った。
参考例2では、参考例1において、前処理2を行わなかった以外は参考例1と同じ処理を行った。この陽極酸化皮膜の膜厚は約10μmであった。得られた陽極酸化皮膜は、マグネシウム元素を24.0重量%、酸素元素を47.6重量%、リン元素を25.6重量%、アルミニウム元素を2.8重量%含有していた。得られた試験片を塩水噴霧試験に供したところ、腐食は観察されなかった。結果を表1に示す。
Claims (6)
- リチウムを含有するマグネシウム合金の表面を、フッ化水素を含有する水溶液で処理した後、陽極酸化することにより該表面に陽極酸化皮膜を形成することを特徴とするマグネシウム合金製品の製造方法。
- 前記マグネシウム合金が、マグネシウムを80~95重量%含有し、かつリチウムを5~20重量%含有する請求項1に記載のマグネシウム合金製品の製造方法。
- 前記水溶液が、フッ化水素を0.5~10mol/L含有し、かつpHが1~5である請求項1又は2に記載のマグネシウム合金製品の製造方法。
- リン酸根を0.1~1mol/L含有し、かつpHが8~14である電解液中で陽極酸化する請求項1~3のいずれかに記載のマグネシウム合金製品の製造方法。
- 前記電解液が、アンモニア又はアンモニウムイオンを0.2~5mol/L含有する請求項4に記載のマグネシウム合金製品の製造方法。
- 前記陽極酸化皮膜の厚さが0.1~50μmである請求項1~5のいずれかに記載のマグネシウム合金製品の製造方法。
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JP2018004262A (ja) * | 2016-06-27 | 2018-01-11 | 富士フイルム株式会社 | 放射線検出カセッテの筐体の製造方法 |
US11180832B2 (en) | 2018-12-17 | 2021-11-23 | Canon Kabushiki Kaisha | Magnesium-lithium alloy member, manufacturing method thereof, optical apparatus, imaging apparatus, electronic apparatus and mobile object |
JP7418117B2 (ja) | 2018-12-17 | 2024-01-19 | キヤノン株式会社 | マグネシウム-リチウム系合金部材及びその製造方法 |
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US4184926A (en) * | 1979-01-17 | 1980-01-22 | Otto Kozak | Anti-corrosive coating on magnesium and its alloys |
JPS5611392A (en) * | 1979-07-11 | 1981-02-04 | Fuji Photo Film Co Ltd | Method and device for converting radiation image |
EP0573585B1 (en) * | 1991-02-26 | 1994-12-14 | Technology Applications Group, Inc. | Two-step chemical/electrochemical process for coating magnesium |
US5264113A (en) * | 1991-07-15 | 1993-11-23 | Technology Applications Group, Inc. | Two-step electrochemical process for coating magnesium alloys |
CN100510197C (zh) * | 2004-12-20 | 2009-07-08 | 中国科学院金属研究所 | 一种环保型镁合金微弧氧化电解液以及微弧氧化方法 |
JP4736084B2 (ja) * | 2005-02-23 | 2011-07-27 | オーエム産業株式会社 | マグネシウム又はマグネシウム合金からなる製品の製造方法 |
CN100540753C (zh) * | 2005-07-21 | 2009-09-16 | 北京航空航天大学 | 溶胶作用下的镁合金基体表面阳极氧化处理方法 |
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JPH09241897A (ja) * | 1996-03-08 | 1997-09-16 | Dipsol Chem Co Ltd | マグネシウム又はその合金表面の前処理方法 |
JP2002515092A (ja) * | 1997-03-24 | 2002-05-21 | マグネシウム テクノロジー リミティド | マグネシウムとマグネシウム合金の陽極酸化 |
JP2003328188A (ja) * | 2002-05-10 | 2003-11-19 | Mitsui Mining & Smelting Co Ltd | マグネシウム合金の表面処理法 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2017028503A (ja) * | 2015-07-22 | 2017-02-02 | Tsk株式会社 | スピーカー用振動板の製造方法 |
JP2018004262A (ja) * | 2016-06-27 | 2018-01-11 | 富士フイルム株式会社 | 放射線検出カセッテの筐体の製造方法 |
US11180832B2 (en) | 2018-12-17 | 2021-11-23 | Canon Kabushiki Kaisha | Magnesium-lithium alloy member, manufacturing method thereof, optical apparatus, imaging apparatus, electronic apparatus and mobile object |
JP7418117B2 (ja) | 2018-12-17 | 2024-01-19 | キヤノン株式会社 | マグネシウム-リチウム系合金部材及びその製造方法 |
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CN105324520B (zh) | 2017-10-27 |
JPWO2014203919A1 (ja) | 2017-02-23 |
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