WO1999042641A1 - Produit a base de magnesium resistant a la corrosion presentant le lustre d'un metal de base et son procede d'obtention - Google Patents
Produit a base de magnesium resistant a la corrosion presentant le lustre d'un metal de base et son procede d'obtention Download PDFInfo
- Publication number
- WO1999042641A1 WO1999042641A1 PCT/JP1999/000792 JP9900792W WO9942641A1 WO 1999042641 A1 WO1999042641 A1 WO 1999042641A1 JP 9900792 W JP9900792 W JP 9900792W WO 9942641 A1 WO9942641 A1 WO 9942641A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- corrosion
- magnesium
- luster
- aluminate
- anodic oxide
- Prior art date
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Classifications
-
- 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 corrosion-resistant magnesium material product exhibiting the luster of a metal base of magnesium or a magnesium alloy (hereinafter, referred to as a magnesium material inclusive of both) and a method for producing the same.
- Materials A corrosion-resistant magnesium material product that has an anodized film on the outer surface of the product, has a colorless or colored transparent electrodeposition coating film on it, and has the luster of a metal substrate, and a new composition of electrolyte To form a colorless or colored transparent electrodeposition coating film by electrodeposition coating to form an anodized film by anodizing using the same, and to provide a method of manufacturing a corrosion-resistant magnesium material product exhibiting the luster of a metal substrate.
- Background art
- Magnesium materials are the lightest and most specific metals in practical metals. By taking advantage of their properties, interior and exterior parts such as automobiles and motorcycles, parts for home appliances, storage containers such as bags and suitcases, and sports Supplies, parts of optical equipment, canes, and even new applications in the electronics industry, such as computers and sound, have been tried and put to practical use. However, since magnesium material is the most active metal material among practical metals, it was difficult to use it as it is in terms of corrosion resistance.
- a product made of a magnesium material is to have decorative properties that make use of the luster and color of the metal base, the surface cannot be painted. However, since the surface of the magnesium material is easily oxidized, some surface treatment is required to maintain the initial gloss and color tone of the metal substrate.
- a film obtained by a conventional chemical conversion treatment or anodization treatment using chromic acid or dichromate is colored white to brown to black or green.
- the ability to obtain corrosion resistance even with a film obtained by anodizing treatment without using chromate or dichromate In order to achieve the necessary corrosion resistance, the film thickness must be several / m or more. That is, it is inevitable that the surface after the anodizing treatment becomes clouded or colored.
- Japanese Patent Application Laid-Open No. 9-176898 discloses a film-forming stabilizer in an aqueous solution containing one or more hydroxides, carbonates, or bicarbonates of an alkaline metal or an alkaline earth metal. Describes a surface treatment method for forming an anodic oxide film using an electrolyte solution to which anodic oxide film is added.In this surface treatment method, it is described that the color tone of the anodic oxide film may be a base color. I have. In the anodic oxide film forming method described in the publication, coloring occurs when a film having a required corrosion resistance is formed.
- the present invention has solved the drawbacks of the conventional anodic oxide coating and the drawbacks of the clear coating, that is, the metallic base of the magnesium material exhibits luster and color tone, or the color tone of the metal base is slightly changed. It is an object of the present invention to provide a magnesium material product exhibiting the luster of a metal base and having corrosion resistance.
- the present invention provides a corrosion-resistant magnesium material product exhibiting the luminosity of a metal substrate by forming an anodized film on the surface of a magnesium material product and forming a colorless or colored transparent electrodeposition coating film thereon.
- the task is to provide a manufacturing method. Disclosure of the invention
- the present inventors have anodized magnesium material products using an electrolyte in which phosphate, which was added as a film-forming stabilizer when anodizing metal was used in combination with aluminate, provided high corrosion resistance.
- a thin but unprecedented colorless and transparent anodic oxide film can be obtained.
- a magnesium material with even more excellent corrosion resistance can be obtained. They found that a product could be obtained and completed the present invention.
- the corrosion-resistant magnesium material product of the present invention having a metallic base has an anodic oxide film on the outer surface of the magnesium material product which does not change the gloss of the metallic base, and a colorless or colored transparent material is formed on the anodic oxide film. It has an electrodeposition coating film.
- the present invention relates to a method for producing a corrosion-resistant magnesium material product exhibiting the luster of a metal substrate of the present invention.
- the method involves immersing a magnesium material product in an electrolyte containing a phosphate and an aluminate, and optionally further containing a bath stabilizer comprising an organic compound having a hydroxyl group, and anodizing the surface thereof. Forming an anodized film, if necessary, then immersing the film in hot water to perform a sealing treatment, and forming a colorless or colored transparent electrodeposition coating film thereon by electrodeposition coating. I do. BEST MODE FOR CARRYING OUT THE INVENTION
- the magnesium material product in the present invention may be made of any magnesium material.
- Such materials include, for example, Mg—A1 alloy, Mg—A1—Zn alloy, Mg—A1—Mn alloy, Mg—Zn—Zr alloy, Magnesium alloys such as Mg-rare earth element alloys, Mg-Zn-rare earth element alloys, and magnesium metal.
- the surface state of the magnesium material product before the anodizing treatment may be in any state, and may be, for example, a surface mirror-finished by polishing or a surface as it is die cast.
- the pretreated magnesium material product is anodized.
- This pretreatment can be carried out on the surface of the as-cast die by various known treatment methods conventionally performed prior to the anodic oxidation treatment of the magnesium material. For example, pyrophosphate treatment, caustic treatment, etc. It can be carried out by an alkali treatment.
- a surface having a mirror gloss is formed, it is necessary to form a mirror-finished surface by polishing, and then perform a pretreatment that does not dissolve (do not lose gloss) the polished surface.
- cleaning with a surfactant treatment, an alkaline treatment, or a combination thereof is performed. Is preferred.
- examples of the phosphate used when forming the anodic oxide film include an alkali metal salt, an alkaline earth metal salt, and an ammonium salt of phosphoric acid. These phosphates may be added to the electrolyte as phosphates, or phosphoric acid and an alkali metal hydroxide, an alkaline earth metal salt, ammonium hydroxide, or the like may be added to the electrolyte to form an electrolyte. Phosphates may be formed in the solution.
- the concentration of the phosphate in the electrolytic solution is preferably 0.05 to 0.2M.
- examples of the aluminate used for forming the anodic oxide film include alkali metal salts, alkaline earth metal salts, and ammonium salts.
- the concentration of the aluminate in the electrolytic solution is preferably from 0.2 to 1M.
- the bath stabilizer optionally used when forming the anodic oxide film is an organic compound having a hydroxyl group, which is known to inhibit the hydrolysis of the aluminate, and is a compound such as glycerin or diethylene glycol.
- a dihydric alcohol is preferably used.
- the concentration of the bath stabilizer in the electrolyte It is preferably 1 to 20 g / 1 and 10 to 50% by weight based on the weight of the aluminate.
- the concentration of the bath stabilizer is less than 1 g / 1 or less than 10% by weight based on the weight of the aluminate, the effect of adding the bath stabilizer tends to be insufficient, If the concentration of the bath stabilizer exceeds 20 g / 1 or exceeds 50% by weight based on the weight of the aluminate, the corrosion resistance of the resulting anodic oxide film tends to be adversely affected. .
- the pH of the electrolytic solution used for forming the anodic oxide film in the present invention is less than 12, it tends to be difficult to perform stable electrolysis, so the pH of the electrolytic solution is 12 or more. Is preferred. Since the pH changes depending on the concentrations of the phosphate and the aluminate, it is preferable to add an alkali substance to the electrolyte as necessary to make the pH of the electrolyte 12 or more.
- the temperature of the electrolyte is preferably room temperature to 50 ° C.
- any power supply such as a DC power supply, an AC power supply, a PR power supply, and a pulse power supply can be used as a power supply used for forming the anodic oxide film.
- a DC power supply or an AC power supply is used. Used.
- the film obtained by anodizing has many pores, and the corrosion resistance of the anodized film In order to further increase the pore size, it is preferable to seal the pores.
- the anodic oxidation treatment if desired, it can be immersed in hot water to perform the sealing treatment according to a known treatment method.
- This hot water is preferably pure water of 85 ° C. or higher, and the treatment time is preferably about 3 to 15 minutes.
- the film thickness must be 1 zm to several tens / m in order to obtain the desired corrosion resistance, and the anodic oxide film is colored white to brown to black or green. It was a film that did.
- the anodic oxide film obtained by the above-described method for forming an anodic oxide film is dense, it has good corrosion resistance even if it is extremely thin, and for example, has a thickness that does not change the luster and color tone of the metal substrate. Even if the thickness is preferably 0.1 zm or less, sufficient corrosion resistance is exhibited. That is, it is possible to obtain a surface having excellent corrosion resistance without substantially changing the gloss and the color tone of the surface of the magnesium material.
- the thickness of the anodic oxide film obtained as described above and the uniformity of the anodic oxide film are determined at least partially on the anodic oxide film formed on the outer surface of the magnesium or magnesium alloy product.
- Platinum is deposited, preferably platinum is deposited by ion sputtering, and the determination can be made easily by the color of the deposited portion.
- the color after platinum deposition changes from light blue to blue violet depending on the thickness of the anodic oxide film, and the thickness of the anodic oxide film is determined by confirming the colored color. Whether or not the film thickness is uniform can be determined based on the presence or absence of unevenness. This technology is useful for manufacturing process control and quality control.
- the phosphate in the electrolyte used in the anodic oxidation was used.
- the above-mentioned determination method can be used as a determination method of the formation method of the anodic oxide film, and also as a coloring method for the purpose of decoration, since it varies depending on the type of the additive such as aluminum and aluminate. For example, it becomes blue when anodically oxidized using an electrolyte containing phosphate and aluminate, and becomes light blue-blue-purple when anodized using an electrolyte containing aluminate. Becomes This phenomenon is caused by light interference caused by the deposition of a platinum film on the anodic oxide film (about 40 to 8 O nm) on the base material (magnesium material).
- the above-mentioned determination method is performed by using an ion-sputtering apparatus, Eiko-I Engineering Co., Ltd. IB-5 type ion coater, using platinum as the metal to be deposited, setting the ion current to 3 mA, and setting the deposition time to 3 minutes. It can be performed by performing ion sputtering of platinum with the degree of vacuum set to 0.1 l Torr.
- the colorless and transparent electrodeposition coating film is formed on the above-described anodized film to give the luster and color tone of the metal substrate, or the colored and transparent electrodeposition coating film is formed to form the metal substrate.
- the color tone is slightly changed, it is possible to obtain a magnesium material product that shows the luster of a metal base material and has even better corrosion resistance o
- Such an electrodeposition coating film can be formed by a well-known anion electrodeposition coating method or a cationic electrodeposition coating method.
- the type of electrodeposition coating tank, the type of electrodeposition coating, the concentration of the electrodeposition coating liquid, the temperature, the PH, the electrodeposition coating voltage, the electrodeposition coating time, etc. when performing such an electrodeposition coating method are well known. In the present invention, such a known technique can be used as it is.
- anion electrodeposition paints include acrylic, modified maleated oil, modified alkyd, polybutadiene, etc.
- As a material there is an epoxy-based material.
- an organic pigment which is ionized in water and has a good affinity for the resin component for example, since it is necessary to electrodeposit evenly with the resin component, for example, , Azo, phthalocyanine, metal complex, trifluoromethyl, quinacridone, perylene, isoindolinone, dioxazine, quinophthalone, vat dye, condensed azo, etc. It is preferable to use These organic pigments are preferably used in the electrodeposition coating solution at a concentration of 0.1 to 15 g / 1.
- the individual constituent requirements of the method for producing a corrosion-resistant magnesium material product exhibiting the luster of a metal substrate have been described above.
- a corrosion-resistant magnesium material product exhibiting the luster of the metal substrate of the present invention can be obtained.
- the corrosion-resistant magnesium material product of the present invention when a colorless and transparent electrodeposition coating film is formed on the anodic oxide film, exhibits the gloss and color tone of the metal material with little change in the gloss and color tone of the magnesium material material, or In the case of forming a colored transparent electrodeposition coating film, the color tone of the magnesium material base is slightly changed, but the gloss of the magnesium material base is exhibited.
- the corrosion-resistant magnesium material product of the present invention is remarkably superior in terms of corrosion resistance as compared with a product obtained by direct electrodeposition coating without performing anodizing treatment, and in terms of luster and color tone of the metal substrate. But it was excellent.
- magnesium material products include cases such as MD recording / reproducing devices known as MD Walkman (registered trademark) and digital video cameras, bags, suitcases, interior and exterior parts of automobiles and motorcycles, and the like. There are welfare-related equipment such as wheelchairs and canes.
- MD Walkman registered trademark
- welfare-related equipment such as wheelchairs and canes.
- the present invention will be specifically described based on examples.
- the AZ91D die-cast plate (5 Ommx 5 OmmX 3 mm) was mirror-finished by mechanical polishing, and the mirror-finished surface was washed with a surfactant and then washed with water.
- an electrolytic solution having a trisodium phosphate monohydrate concentration of 25 gZ ⁇ , a sodium aluminate concentration of 25 g / 1, a glycerin concentration of 10 g, and a pH of 13.0 was prepared. While maintaining the temperature of the electrolytic solution at 30 ° C., the washed die-cast plate was immersed, and DC electrolysis was performed at an electrolytic voltage of 65 V for 30 seconds. It was washed with water and then immersed in pure water at 90 ° C.
- the thickness of the anodic oxide film on the die-cast plate subjected to the anodic oxidation treatment and sealed was measured by ellipsometry and found to be 6 O nm.
- the anodized die-cast plate is electrodeposited under the following electrodeposition conditions.
- Elecoat AM [trade name, manufactured by Shimizu Corporation] diluted to 1Z2 with ion-exchanged water.
- Bath temperature of electrodeposition coating liquid 25 ° C
- Electrodeposition voltage 50 V
- Electrodeposition time 30 seconds
- Cathode bag cotton flannel
- the die-cast plate that has been electrodeposition coated under the above electrodeposition conditions is washed with water, pre-dried at 80 ° C in an air atmosphere for 10 minutes in a dryer, and then dried at 150 ° C in an air atmosphere in a firing furnace. C was baked for 30 minutes.
- Example 1 The same procedure as in Example 1 was carried out except that pink Eleco Tokara 1 (trade name, manufactured by Shimizu Corporation) was used as the acrylic anion electrodeposition paint, and the comparison, measurement, and evaluation were performed in the same manner as in Example 1.
- pink Eleco Tokara 1 trade name, manufactured by Shimizu Corporation
- a die-cast plate that has only been subjected to mirror finishing and cleaning, and further on it
- the gloss and color tone of the surfaces were compared with the naked eye, but almost no difference was observed when they reached Higasawa. In terms of strength and color, the appearance of the electrodeposited die-cast plate was slightly pinkish.
- the corrosion resistance of the die-cast plate with anodized film but not electrodeposited was tested by repeating the salt spray for 8 hours and 16 hours for 2 cycles, and evaluated by the rating gun picker method. there were.
- An AZ91D die-cast plate (50 mm x 50 mm x 3 mm) was mirror-finished by mechanical polishing, and the mirror-finished surface was washed with a surfactant and then washed with water.
- the die-cast plate treated in this manner is electrodeposited under the same electrodeposition conditions as in Example 1, washed with water, pre-dried in a dryer at 80 ° C. for 10 minutes in the air, and then fired in a furnace. It was baked at 150 ° C for 30 minutes in the air atmosphere. .
- the gloss and color tone of the surface of the die-cast plate obtained in this way were more cloudy than the gloss and color tone of the surface of the die-cast plate obtained in Example 1.
- the magnesium material product of the present invention exhibits the luster and color tone of the magnesium material base or the luster of the metal base with almost no change in the luster, and is extremely excellent in corrosion resistance. Therefore, it is known as MD Walkman (registered trademark) or the like. It can be used for cases such as MD recording / reproducing devices and digital video cameras, bags, suitcases, interior and exterior parts of automobiles and motorcycles, wheelchairs, canes, and other welfare-related tools.
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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)
- Other Surface Treatments For Metallic Materials (AREA)
- Powder Metallurgy (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT99905276T ATE255176T1 (de) | 1998-02-23 | 1999-02-23 | Produkt auf magnesiumbasis mit erhöhtem glanz des basismetalls und korrosionsbeständigkeit und verfahren zu dessen herstellung |
EP99905276A EP0978576B1 (en) | 1998-02-23 | 1999-02-23 | Corrosion-resistant, magnesium-based product exhibiting luster of base metal and method for producing the same |
US09/403,503 US6335099B1 (en) | 1998-02-23 | 1999-02-23 | Corrosion resistant, magnesium-based product exhibiting luster of base metal and method for producing the same |
DE69913049T DE69913049D1 (de) | 1998-02-23 | 1999-02-23 | Produkt auf magnesiumbasis mit erhöhtem glanz des basismetalls und korrosionsbeständigkeit und verfahren zu dessen herstellung |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04018798A JP4223088B2 (ja) | 1998-02-23 | 1998-02-23 | 金属素地の光沢を呈する耐食性マグネシウム材料製品及びその製造方法 |
JP10/40187 | 1998-02-23 | ||
JP10/69128 | 1998-03-18 | ||
JP10069128A JPH11264094A (ja) | 1998-03-18 | 1998-03-18 | MgまたはMg合金の皮膜判定方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999042641A1 true WO1999042641A1 (fr) | 1999-08-26 |
Family
ID=26379631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/000792 WO1999042641A1 (fr) | 1998-02-23 | 1999-02-23 | Produit a base de magnesium resistant a la corrosion presentant le lustre d'un metal de base et son procede d'obtention |
Country Status (5)
Country | Link |
---|---|
US (1) | US6335099B1 (ja) |
EP (1) | EP0978576B1 (ja) |
AT (1) | ATE255176T1 (ja) |
DE (1) | DE69913049D1 (ja) |
WO (1) | WO1999042641A1 (ja) |
Families Citing this family (26)
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DE10022074A1 (de) * | 2000-05-06 | 2001-11-08 | Henkel Kgaa | Elektrochemisch erzeugte Schichten zum Korrosionsschutz oder als Haftgrund |
WO2002028838A2 (en) * | 2000-10-05 | 2002-04-11 | Magnesium Technology Limited | Magnesium anodisation system and methods |
AU2002211117A1 (en) * | 2000-10-11 | 2002-04-22 | Industrial Research Limited | Method for anodising magnesium and magnesium alloy components or elements |
GB2395491B (en) * | 2001-08-14 | 2006-03-01 | Magnesium Technology Ltd | Magnesium anodisation system and methods |
JP2003160898A (ja) * | 2001-09-17 | 2003-06-06 | Fujitsu Ltd | マグネシウム材の着色方法およびこれにより着色されたマグネシウム材製筐体 |
US7820300B2 (en) | 2001-10-02 | 2010-10-26 | Henkel Ag & Co. Kgaa | Article of manufacture and process for anodically coating an aluminum substrate with ceramic oxides prior to organic or inorganic coating |
US6916414B2 (en) | 2001-10-02 | 2005-07-12 | Henkel Kommanditgesellschaft Auf Aktien | Light metal anodization |
US7452454B2 (en) | 2001-10-02 | 2008-11-18 | Henkel Kgaa | Anodized coating over aluminum and aluminum alloy coated substrates |
US7578921B2 (en) | 2001-10-02 | 2009-08-25 | Henkel Kgaa | Process for anodically coating aluminum and/or titanium with ceramic oxides |
US7569132B2 (en) * | 2001-10-02 | 2009-08-04 | Henkel Kgaa | Process for anodically coating an aluminum substrate with ceramic oxides prior to polytetrafluoroethylene or silicone coating |
US6495267B1 (en) * | 2001-10-04 | 2002-12-17 | Briggs & Stratton Corporation | Anodized magnesium or magnesium alloy piston and method for manufacturing the same |
EP1302565B1 (de) * | 2001-10-11 | 2004-09-22 | FRANZ Oberflächentechnik GmbH & Co KG | Beschichtungsverfahren für Leichtmetalllegierungsoberflächen |
AU2003213340A1 (en) * | 2002-03-25 | 2003-10-08 | Hori Metal Finishing Ind. Ltd. | Magnesium or magnesium alloy article having electroconductive anodic oxidation coating on the surface thereof and method for production thereof |
JP2004091852A (ja) * | 2002-08-30 | 2004-03-25 | Fujitsu Ltd | マグネシウム材に対する高耐食性陽極酸化膜の形成方法およびこれにより形成されたマグネシウム材製筐体 |
DE10393234T5 (de) * | 2002-09-09 | 2005-10-27 | Magnesium Technology Ltd., Onehunga | Oberflächenbehandlung von Magnesium und seinen Legierungen |
JP4307172B2 (ja) * | 2003-08-22 | 2009-08-05 | パイオニア株式会社 | マグネシウム振動板、その製造方法、および、スピーカ装置 |
TWI321554B (en) * | 2004-08-25 | 2010-03-11 | Rohm & Haas | Composition for forming a composite material |
US20070112636A1 (en) * | 2005-11-14 | 2007-05-17 | Lucker William G Jr | Community Based Marketing System and Method |
US7713618B2 (en) * | 2006-10-19 | 2010-05-11 | Gm Global Technology Operations, Inc. | Sacrificial coatings for magnesium components |
WO2010079534A1 (ja) * | 2009-01-09 | 2010-07-15 | 住友電気工業株式会社 | マグネシウム合金部材 |
US9701177B2 (en) | 2009-04-02 | 2017-07-11 | Henkel Ag & Co. Kgaa | Ceramic coated automotive heat exchanger components |
US8416829B1 (en) * | 2011-10-24 | 2013-04-09 | Lawrence Livermore National Security, Llc | Corrosion-resistant multilayer structures with improved reflectivity |
KR20160049119A (ko) * | 2014-10-24 | 2016-05-09 | 현대자동차주식회사 | 주조용 알루미늄 합금 표면 처리용 전해액 및 주조용 알루미늄 합금 표면 처리방법 |
US9506161B2 (en) * | 2014-12-12 | 2016-11-29 | Metal Industries Research & Development Centre | Surface treatment of a magnesium alloy |
US11920244B2 (en) * | 2018-07-24 | 2024-03-05 | Hewlett-Packard Development Company, L.P. | Device housing with metallic luster |
CN112440430A (zh) * | 2019-08-30 | 2021-03-05 | 比亚迪股份有限公司 | 树脂-铝合金复合体和制备方法,以及壳体 |
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1999
- 1999-02-23 EP EP99905276A patent/EP0978576B1/en not_active Expired - Lifetime
- 1999-02-23 AT AT99905276T patent/ATE255176T1/de not_active IP Right Cessation
- 1999-02-23 DE DE69913049T patent/DE69913049D1/de not_active Expired - Lifetime
- 1999-02-23 WO PCT/JP1999/000792 patent/WO1999042641A1/ja active IP Right Grant
- 1999-02-23 US US09/403,503 patent/US6335099B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
ATE255176T1 (de) | 2003-12-15 |
US6335099B1 (en) | 2002-01-01 |
EP0978576B1 (en) | 2003-11-26 |
EP0978576A4 (en) | 2000-11-08 |
EP0978576A1 (en) | 2000-02-09 |
DE69913049D1 (de) | 2004-01-08 |
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