WO2015019828A1 - Matériau à base d'aluminium traité en surface et élément réfléchissant les rayons ultraviolets - Google Patents

Matériau à base d'aluminium traité en surface et élément réfléchissant les rayons ultraviolets Download PDF

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Publication number
WO2015019828A1
WO2015019828A1 PCT/JP2014/069171 JP2014069171W WO2015019828A1 WO 2015019828 A1 WO2015019828 A1 WO 2015019828A1 JP 2014069171 W JP2014069171 W JP 2014069171W WO 2015019828 A1 WO2015019828 A1 WO 2015019828A1
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WO
WIPO (PCT)
Prior art keywords
aluminum material
ultraviolet
treated aluminum
corrosion resistance
positive electrode
Prior art date
Application number
PCT/JP2014/069171
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English (en)
Japanese (ja)
Inventor
裕貴 吉富
正憲 遠藤
大介 長澤
浩昭 北
知広 河本
Original Assignee
日本軽金属株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 日本軽金属株式会社 filed Critical 日本軽金属株式会社
Publication of WO2015019828A1 publication Critical patent/WO2015019828A1/fr

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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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0891—Ultraviolet [UV] mirrors

Definitions

  • the present invention relates to a surface-treated aluminum material having a specific color tone with an anodized film formed on the surface, and particularly relates to a surface-treated aluminum material excellent in ultraviolet reflectivity and corrosion resistance, and is particularly limited.
  • various devices such as health and medical equipment, food-related disinfection equipment, UV sterilization equipment attached to water purification equipment and air conditioning equipment, and resin curing equipment for curing UV curable resins are used.
  • the present invention relates to an ultraviolet reflecting member suitably used in an apparatus.
  • a surface-treated aluminum material having an anodized film on the surface of an aluminum material made of aluminum or an aluminum alloy has excellent strength, low-temperature characteristics, electrical conductivity, thermal conductivity, non-magnetic properties, non-toxicity, scrap recyclability, corrosion resistance, etc. Although it is a metal, it is lightweight and excellent in workability, and is widely used in many fields such as building materials, vehicle materials, electronic / electric equipment materials, containers, general machinery, and foil products.
  • ⁇ -treated aluminum materials are used in various apparatuses using ultraviolet rays such as an ultraviolet sterilization apparatus, and attempts have been made to use them as ultraviolet reflecting members that require high ultraviolet reflectivity and corrosion resistance.
  • a rough surface having a center line average roughness (Ra) of 0.3 to 2.0 ⁇ m is formed on at least one surface of an aluminum substrate, and an anode intended to impart corrosion resistance to the rough surface of the substrate.
  • An ultraviolet diffusive reflector formed by forming an oxide film has been proposed, and in Patent Document 2, the purity is 99% by mass or more and the (220) plane / (200) plane X-ray diffraction intensity ratio and An ultraviolet reflection formed of aluminum having an X-ray diffraction intensity ratio of (111) plane / (200) plane of 1.0 or more and an anodic oxide film formed on the surface for the purpose of imparting corrosion resistance.
  • a board has been proposed.
  • an anodic oxidation process which uses sulfuric acid aqueous solution as electrolyte is performed, and it forms by this anodic oxidation process.
  • the film thickness of the anodized film is considered to be in the range of 1 to 3 ⁇ m, because if it becomes too thick, the ultraviolet reflectance decreases, and if it becomes too thin, sufficient corrosion resistance cannot be imparted. Yes.
  • the anodized film obtained by the anodizing treatment using an aqueous sulfuric acid solution as an electrolyte has insufficient corrosion resistance when immersed in fresh water, and has an ultraviolet reflectivity. There is a problem that it cannot be maintained for a long time.
  • Patent Document 3 of tap water proposes an ultraviolet sterilizer using a stainless steel tube used as a flow path as an ultraviolet reflector.
  • the stainless steel tube is excellent in corrosion resistance against tap water, but it has an ultraviolet reflectance for ultraviolet rays with a wavelength of 254 nm, which is effective for killing bacteria and viruses, and an average ultraviolet reflectance for ultraviolet rays with a wavelength of 200 to 400. Is less than 50%, the effect of improving the sterilization effect by ultraviolet reflection by the stainless steel tube is poor, and there is a problem that if the specific gravity is large and the apparatus is enlarged, the weight increases and the handling property is inferior.
  • the inventors have conducted extensive studies on the development of a surface-treated aluminum material that has a high degree of ultraviolet reflectivity and corrosion resistance and can be used as an ultraviolet reflection member.
  • anodizing treatment using oxalic acid electrolyte there is a correlation between the electrolysis voltage and the ultraviolet reflectance, and constant voltage anodizing treatment using oxalic acid electrolyte at low voltage and sealing treatment are performed.
  • the present inventors have found that the corrosion resistance can be remarkably improved while maintaining the reflectance for ultraviolet rays having a wavelength of 254 nm and the average reflectance for ultraviolet rays having a wavelength in the range of 200 to 400 nm to be high.
  • an object of the present invention is to provide a surface-treated aluminum material having an anodized film formed on the surface and having excellent ultraviolet reflectivity and corrosion resistance.
  • Another object of the present invention is a surface-treated aluminum material having an anodized film formed on the surface thereof, and has excellent ultraviolet reflectivity and corrosion resistance, such as a health care device, a food-related disinfection device, a water purification facility,
  • An object of the present invention is to provide an ultraviolet reflecting member suitably used in various devices and apparatuses such as an ultraviolet sterilization apparatus attached to an air conditioning facility and a resin curing apparatus for curing an ultraviolet curable resin.
  • the present invention is a surface-treated aluminum material having an anodized film on the surface of an aluminum material made of aluminum or an aluminum alloy, and the anodized film is a constant voltage of 10 to 30 V using an oxalic acid electrolyte.
  • sealing treatment is performed after this anodizing treatment, and the reflectivity with respect to ultraviolet light with a wavelength of 254 nm is 50% or more, and with respect to ultraviolet light with a wavelength of 200 to 400 nm.
  • a surface-treated aluminum material having an average reflectance of 70% or more.
  • the present invention is an ultraviolet light reflecting member formed of the above surface-treated aluminum material.
  • the aluminum material can be appropriately selected from high-purity aluminum or 1000 series, 5000 series, 6000 series, 3000 series, etc., depending on the intended use.
  • a surface-treated aluminum material having excellent ultraviolet reflectivity can be produced, and since it is excellent in handling properties such as workability, it is preferably a 1000 series having a purity of 99.0% by mass or more. It is good that it is 99 mass% or more of high purity aluminum.
  • the anodizing treatment for forming an anodized film on the surface of the aluminum material is usually 10 g / L or more and 50 g / L or less, preferably 17 g / L or more and 37 g / L or less, more preferably 20 g / L. It is necessary to use an oxalic acid electrolytic solution having an oxalic acid concentration of 30 g / L or less and a voltage of 10 V to 30 V, preferably 15 V to 20 V under a constant voltage condition. If the oxalic acid concentration of the oxalic acid electrolyte is less than 10 g / L, the anodizing process takes a long time and there is a problem that workability deteriorates.
  • the concentration is higher than 50 g / L, the electrolyte is taken into the film. There is a problem that the amount of components increases and the ultraviolet reflectance decreases.
  • the electrolytic voltage during anodizing is lower than 10V, there is a problem that the processing time of anodizing becomes longer and workability is deteriorated.
  • the electrolytic voltage is higher than 30V, the ultraviolet reflectance is lowered. Arise.
  • the electrolysis voltage of 10 to 30 V at the time of anodization using an oxalic acid electrolyte is lower than the electrolysis voltage in the usual anodization film treatment, but the anodized film obtained at such a low electrolysis voltage is formed.
  • the amount of carbon contained in the anodized film is small, and it is considered that it exhibits high ultraviolet reflectivity due to complex factors including this, and the UV reflectivity deteriorates under UV irradiation conditions. Is considered to be prevented.
  • an anodized film obtained by anodizing using a sulfuric acid electrolyte has an initial ultraviolet reflectivity comparable to that of the anodized film obtained by the method of the present invention, but is 40 ° C.
  • JIS S 200 3200-7 severe fresh water immersion test which is immersed in artificial tap water for a long time, its corrosion resistance is insufficient, so corrosion gradually progresses, and the ultraviolet reflectivity decreases accordingly.
  • the anodized film formed by the anodizing treatment is subjected to a sealing treatment.
  • Conventionally known methods such as a method of treating with high-temperature pure water, a method of treating with high-temperature steam, a method of treating with an aqueous solution of nickel acetate, and a method of treating with an aqueous solution of nickel fluoride can be employed.
  • the surface-treated aluminum material that has been subjected to sealing treatment has excellent UV reflectivity and corrosion resistance over a long period of time even in the harsh fresh water immersion test (JIS S 3200-7) immersed in artificial tap water at 40 ° C. To demonstrate.
  • the thickness of the anodized film formed on the surface of the aluminum material is not particularly limited, but is usually 0.2 ⁇ m or more and 5 ⁇ m or less, preferably 0.5 ⁇ m or more and 1 ⁇ m or less. If the film thickness is less than 0.2 ⁇ m, the desired corrosion resistance may not be achieved. On the other hand, if the film thickness is greater than 5 ⁇ m, the desired UV reflectivity may not be achieved. Since the treatment is performed under a low voltage, the treatment time of the anodizing treatment becomes too long, the workability is lowered, and the manufacturing cost is increased.
  • the surface-treated aluminum material of the present invention was measured using a spectrophotometer (Lambda 750S manufactured by PerkinElmer Co., Ltd.) and a standard white plate (Spectralon SRS-99 manufactured by Labsphere Co., Ltd.) as a standard reflector. Excellent bactericidal effect against bacteria and viruses. Reflectance for ultraviolet rays with a wavelength of 254 nm is 50% or more, average reflectance for ultraviolet rays in the wavelength range of 200 to 400 nm is 70% or more, and excellent ultraviolet reflectivity. Have.
  • the surface-treated aluminum material of the present invention is not only excellent in ultraviolet reflectivity, but also reflects ultraviolet rays before and after the test in a severe fresh water immersion test (JIS S 3200-7) immersed in artificial tap water at 40 ° C. The rate is maintained and it has excellent corrosion resistance.
  • the color tone of the b * value is in the range of -6 to 1 in the film having excellent ultraviolet reflectivity. This is because the concentration of the anodic oxide in the film generated by the oxalic acid anodizing treatment is considered to be the cause, and the concentration of the anodic oxide depends on the voltage of the anodizing treatment and the film thickness of the film.
  • the surface-treated aluminum material of the present invention is excellent in both ultraviolet reflectivity and corrosion resistance. Therefore, the ultraviolet reflection of medical / food-related disinfection devices, UV sterilization devices for water purification and air conditioning, and resin curing devices. It can be suitably used as a material.
  • the surface-treated aluminum material of the present invention is excellent in both ultraviolet reflectivity and corrosion resistance, building materials, vehicle materials, electronic / electric equipment materials that make use of these performances, including applications as ultraviolet reflective members, It is a surface-treated aluminum material that is useful for many applications such as container, general machinery, and foil products.
  • the ultraviolet reflecting member of the present invention has excellent ultraviolet reflectivity and corrosion resistance
  • the ultraviolet sterilization apparatus and the ultraviolet curable resin attached to the health care device, the food-related disinfection device, the water purification facility and the air conditioning facility It is suitably used in various devices and apparatuses such as a resin curing apparatus for curing the resin.
  • the cut aluminum material was subjected to the following treatment as a pretreatment. First, it is immersed in a 30 wt% aqueous nitric acid solution at room temperature (20 ° C.) for 3 minutes and then washed with pure water, then immersed in a 5 wt% aqueous sodium hydroxide solution at 50 ° C. for 3 minutes and then washed with pure water. Then, it was immersed in a 30 wt% nitric acid aqueous solution at room temperature (20 ° C.) for 3 minutes and then washed with pure water.
  • the electrolytic solution As the electrolytic solution, a 0.3 mol (M) concentration oxalic acid aqueous solution (oxalic acid electrolytic solution) or a 2 mol (M) concentration sulfuric acid aqueous solution (sulfuric acid electrolytic solution) was used. Moreover, about the process conditions, the anodic oxidation process was implemented until the film thickness shown in Table 1 was obtained under the applied voltage shown in Table 1 with the bath temperature of 18 degreeC. In Comparative Example 6, the aluminum material after the anodizing treatment obtained here was used as the surface-treated aluminum material of Comparative Example 6 without performing the sealing treatment described below.
  • Examples 1 to 3 and Comparative Example 1 were performed by sealing the anodized film formed by the anodizing treatment in the pressure-resistant vessel with the pressurized steam at 150 ° C. and 0.3 MPa in the aluminum material after the anodizing treatment. 5 to 5 surface-treated aluminum materials were obtained.

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  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)

Abstract

　L'invention concerne un matériau à base d'aluminium traité en surface qui comporte un film d'oxydation d'électrode positive formé sur une de ses surfaces externes, et qui présente une meilleure performance de réflexion des rayons ultraviolets et une meilleure résistance à la corrosion. En outre, l'invention concerne un élément réfléchissant les rayons ultraviolets qui comprend le matériau à base d'aluminium traité en surface qui comporte le film d'oxydation d'électrode positive formé sur une de ses surfaces externes et qui présente une meilleure performance de réflexion des rayons ultraviolets et une meilleure résistance à la corrosion, l'élément réfléchissant les rayons ultraviolets étant utilisé favorablement dans divers appareils et dispositifs. Le matériau à base d'aluminium traité en surface comporte un film d'oxydation d'électrode positive formé sur une de ses surfaces externes, le film d'oxydation d'électrode positive étant formé par oxydation de l'électrode positive avec une tension constante comprise entre 10 et 30 V à l'aide d'un électrolyte d'acide oxalique, un traitement de colmatage étant réalisé après l'oxydation de l'électrode positive, le facteur de réflexion des rayons ultraviolets présentant une longueur d'onde de 254 nm étant supérieur ou égal à 50 %, et le facteur de réflexion moyen des rayons ultraviolets présentant des longueurs d'onde dans la plage allant de 200 à 400 nm étant supérieur ou égal à 70 %.
PCT/JP2014/069171 2013-08-05 2014-07-18 Matériau à base d'aluminium traité en surface et élément réfléchissant les rayons ultraviolets WO2015019828A1 (fr)

Applications Claiming Priority (2)

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JP2013-161988 2013-08-05
JP2013161988A JP6098426B2 (ja) 2013-08-05 2013-08-05 表面処理アルミニウム材及びこれを用いた紫外線反射部材、並びに紫外線反射部材の製造方法

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08225992A (ja) * 1995-02-16 1996-09-03 Showa Alum Corp 紫外線拡散反射板
JP2007246932A (ja) * 2006-03-13 2007-09-27 Nippon Light Metal Co Ltd 複層皮膜形成方法
JP2011190466A (ja) * 2009-03-11 2011-09-29 Fujifilm Corp アルミニウム合金基板および太陽電池用基板
JP2012136749A (ja) * 2010-12-27 2012-07-19 Fujifilm Corp 光反射基板
JP2012201891A (ja) * 2011-03-23 2012-10-22 Fujifilm Corp 絶縁基板ならびにそれを用いた配線基板、半導体パッケージおよびｌｅｄパッケージ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430785U (fr) * 1977-08-03 1979-02-28
JP2001281426A (ja) * 2000-03-31 2001-10-10 Kobe Steel Ltd 紫外線反射板

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08225992A (ja) * 1995-02-16 1996-09-03 Showa Alum Corp 紫外線拡散反射板
JP2007246932A (ja) * 2006-03-13 2007-09-27 Nippon Light Metal Co Ltd 複層皮膜形成方法
JP2011190466A (ja) * 2009-03-11 2011-09-29 Fujifilm Corp アルミニウム合金基板および太陽電池用基板
JP2012136749A (ja) * 2010-12-27 2012-07-19 Fujifilm Corp 光反射基板
JP2012201891A (ja) * 2011-03-23 2012-10-22 Fujifilm Corp 絶縁基板ならびにそれを用いた配線基板、半導体パッケージおよびｌｅｄパッケージ

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JP6098426B2 (ja) 2017-03-22

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