JP2015030888A - Surface-treated aluminum material and ultraviolet reflection member using the same - Google Patents
Surface-treated aluminum material and ultraviolet reflection member using the same Download PDFInfo
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- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
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- 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
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- C25D11/246—Chemical after-treatment for sealing layers
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Abstract
Description
この発明は、表面に陽極酸化皮膜が形成されて特定の色調を有する表面処理アルミニウム材に係り、特に紫外線反射性及び耐食性に優れた表面処理アルミニウム材に関するものであり、また、特に限定されるものではないが、これを用いて形成され、健康医療機器、食品関連消毒装置、浄水設備や空調設備に付設される紫外線殺菌装置、紫外線硬化性樹脂を硬化させるための樹脂硬化装置等の各種の機器や装置において好適に用いられる紫外線反射部材に関する。 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. However, 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. In particular, the present invention relates to an ultraviolet reflecting member suitably used in an apparatus.
アルミニウム又はアルミニウム合金からなるアルミニウム材の表面に陽極酸化皮膜を有する表面処理アルミニウム材は、強度、低温特性、電気伝導性、熱伝導性、非磁性、無毒性、スクラップ再生性、耐食性等に優れた金属でありながら、軽量で加工性にも優れており、建築材料、車両用材料、電子・電気機器材料、器物、一般機械、箔製品等の極めて多くの分野で多用されている。 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.
また、このような表面処理アルミニウム材については、紫外線殺菌装置等の紫外線を利用する様々な装置で使用され、高度の紫外線反射性及び耐食性が求められる紫外線反射部材としての利用も試みられている。
例えば、特許文献１においては、アルミニウム製基板の少なくとも片面に中心線平均粗さ（Ra）０．３〜２．０μmの粗面を形成し、この基板の粗面に耐食性付与を目的とした陽極酸化皮膜を形成してなる紫外線拡散反射板が提案されており、また、特許文献２においては、純度９９質量%以上であって、(220)面／(200)面のＸ線回折強度比及び(111)面／(200)面のＸ線回折強度比のいずれか一方又は両方が１．０以上であるアルミニウムからなり、表面に耐食性付与を目的とした陽極酸化皮膜を形成してなる紫外線反射板が提案されている。
Further, such surface-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.
For example, in Patent Document 1, a rough surface having a center line average roughness (Ra) of 0.3 to 2.0 μm is formed on at least one surface of an aluminum substrate, and the 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.
そして、これら特許文献１及び２においては、アルミニウム材の表面に陽極酸化皮膜を形成するに際し、硫酸水溶液を電解液とする陽極酸化処理が行われており、また、この陽極酸化処理で形成される陽極酸化皮膜の膜厚については、厚くなり過ぎると紫外線反射率が低下し、反対に、薄くなり過ぎると十分な耐食性を付与できないことから、膜厚１〜３μmの範囲が適当であるとされている。 And in these patent documents 1 and 2, when forming an anodic oxide film on the surface of an aluminum material, an anodic oxidation process which uses sulfuric acid aqueous solution as electrolyte is performed, and it forms by this anodic oxidation process. Regarding the film thickness of the anodized film, if it is too thick, the ultraviolet reflectance decreases, and conversely, if it is too thin, sufficient corrosion resistance cannot be imparted, so a film thickness range of 1 to 3 μm is considered appropriate. Yes.
しかしながら、本発明者らの検討によれば、硫酸水溶液を電解液とする陽極酸化処理で得られた陽極酸化皮膜は、淡水に浸漬した際の耐食性が不十分であり、また、紫外線反射性を長時間維持できないという問題がある。 However, according to the study by the present inventors, 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.
ところで、水道水の特許文献３には、流路として使用されるステンレス管を紫外線の反射体として利用する紫外線殺菌装置が提案されている。しかしながら、ステンレス管は、水道水に対する耐食性には優れているが、細菌やウイルスを死滅させるのに有効な波長２５４nmの紫外線に対する紫外線反射率や、波長２００〜４００nmの紫外線に対する平均紫外線反射率がいずれも５０%未満であって、このステンレス管による紫外線反射によって殺菌効果を改善する効果に乏しく、また、比重が大きくて装置が大型化すると重量が嵩んでハンドリング性に劣るという問題がある。 By the way, Patent Document 3 of tap water proposes an ultraviolet sterilizer using a stainless steel tube used as a flow path as an ultraviolet reflector. However, the stainless steel tube is excellent in corrosion resistance to 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 nm. 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.
そこで、発明者らは、高度の紫外線反射性及び耐食性を有して紫外線反射部材としての利用が可能である表面処理アルミニウム材の開発について鋭意検討を重ねた結果、意外なことには、電解液としてシュウ酸電解液を用いた陽極酸化処理においては電解電圧と紫外線反射率との間に相関関係があり、低電圧でシュウ酸電解液を用いた定電圧陽極酸化処理を行うと共に封孔処理を施すことにより、波長２５４nmの紫外線に対する反射率や波長２００〜４００nmの範囲の紫外線に対する平均反射率が高い値に維持したまま、耐食性を顕著に改善できることを見出し、本発明を完成した。 Therefore, 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. In the 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. As a result, 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.
従って、本発明の目的は、表面に陽極酸化皮膜が形成され、優れた紫外線反射性及び耐食性を有する表面処理アルミニウム材を提供するものである。 Accordingly, 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.
また、本発明の他の目的は、表面に陽極酸化皮膜が形成された表面処理アルミニウム材からなり、優れた紫外線反射性及び耐食性を有して、健康医療機器、食品関連消毒装置、浄水設備や空調設備に付設される紫外線殺菌装置、紫外線硬化性樹脂を硬化させるための樹脂硬化装置等の各種の機器や装置において好適に用いられる紫外線反射部材を提供することにある。 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.
すなわち、本発明は、アルミニウム又はアルミニウム合金からなるアルミニウム材の表面に陽極酸化皮膜を有する表面処理アルミニウム材であって、前記陽極酸化皮膜は、シュウ酸電解液を用いた電圧１０〜３０Vの定電圧陽極酸化処理で形成されていると共に、この陽極酸化処理後に封孔処理が施されており、また、波長２５４nmの紫外線に対する反射率が５０%以上であって、波長２００〜４００nmの範囲の紫外線に対する平均反射率が７０%以上であることを特徴とする表面処理アルミニウム材である。 That is, 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. In addition to being formed by anodizing treatment, sealing treatment is performed after this anodizing treatment, and the reflectivity for ultraviolet light with a wavelength of 254 nm is 50% or more, and for ultraviolet light with a wavelength of 200 to 400 nm. A surface-treated aluminum material having an average reflectance of 70% or more.
また、本発明は、上記表面処理アルミニウム材で形成されていることを特徴とする紫外線反射部材である。 Moreover, this invention is formed with the said surface-treated aluminum material, The ultraviolet reflective member characterized by the above-mentioned.
本発明において、アルミニウム材としては、用途によって高純度アルミニウムあるいは、１０００系、５０００系、６０００系、３０００系等の中から適宜選択することができるが、特に紫外線反射部材としての用途には、より優れた紫外線反射性を有する表面処理アルミニウム材を製造することができ、また、加工性等のハンドリング性にも優れていることから、好ましくは、純度９９．０質量%以上の１０００系あるいは９９．９９質量％以上の高純度アルミニウムであるのがよい。 In the present invention, 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.
本発明において、アルミニウム材の表面に陽極酸化皮膜を形成するための陽極酸化処理については、通常１０g/L以上５０g/L以下、好ましくは１７g/L以上３７g/L以下、より好ましくは２０g/L以上３０g/L以下のシュウ酸濃度を有するシュウ酸電解液を用い、１０V以上３０V以下、好ましくは15V以上20V以下の電圧で、定電圧条件下で実施する必要がある。シュウ酸電解液のシュウ酸濃度が１０g/Lより薄いと陽極酸化処理の処理時間が長くなり，作業性が低下するという問題があり、反対に、５０g/Lより濃くなると皮膜に取り込まれる電解液成分が多くなり，紫外線反射率が低くなるという問題が生じる。また、陽極酸化処理時の電解電圧が１０Vより低いと陽極酸化処理の処理時間が長くなり，作業性が低下するという問題があり、反対に、３０Vより高くなると紫外線反射率が低くなるという問題が生じる。 In the present invention, 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. On the other hand, if 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. In addition, when 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. Conversely, when the electrolytic voltage is higher than 30V, the ultraviolet reflectance is lowered. Arise.
一般に、シュウ酸電解液を用いた陽極酸化処理時の電解電圧１０〜３０Vは通常の陽極酸化皮膜処理における電解電圧よりも低いが、このように低い電解電圧で得られた陽極酸化皮膜は、形成された陽極酸化皮膜中に含まれる炭素量等が少なく、このことを始めとする複合的な要因から、高い紫外線反射性を示すものと考えられ、また、紫外線照射条件下における紫外線反射性の劣化が防止されるものと考えられる。例えば、硫酸電解液を用いた陽極酸化処理で得られた陽極酸化皮膜は、本発明の方法で得られた陽極酸化皮膜と比較して、初期の紫外線反射性は同程度であるが、４０℃で人工水道水に長時間浸漬する過酷な淡水浸漬試験（JIS S 3200-7）でその耐食性が不十分であることから、次第に腐食が進行し、これに伴って紫外線反射性が低下する。 In general, 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 normal anodization film treatment, but the anodic oxide 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. For example, 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. In the severe fresh water immersion test (JIS S 3200-7), which is immersed in artificial tap water for a long time, the corrosion resistance is insufficient, so corrosion gradually progresses, and the ultraviolet reflectivity decreases accordingly.
そして、本発明の表面処理アルミニウム材については、耐食性向上を目的に、陽極酸化処理で形成された陽極酸化皮膜について封孔処理が施されている必要があり、この封孔処理の方法についても、高温純水で処理する方法、高温水蒸気で処理する方法、酢酸ニッケル水溶液で処理する方法、フッ化ニッケル水溶液で処理する方法等の従来公知の方法を採用できる。この封孔処理が施された表面処理アルミニウム材は、４０℃で人工水道水に浸漬する過酷な淡水浸漬試験（JIS S 3200-7）においても、長期間に亘って優れた紫外線反射性及び耐食性を発揮する。 And, for the surface-treated aluminum material of the present invention, for the purpose of improving the corrosion resistance, it is necessary that 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 subjected to the sealing treatment has excellent ultraviolet reflectivity and corrosion resistance over a long period of time even in a severe fresh water immersion test (JIS S 3200-7) immersed in artificial tap water at 40 ° C. Demonstrate.
また、本発明において、アルミニウム材の表面に形成される陽極酸化皮膜の膜厚については、特に限定されるものではないが、通常０．２μm以上５μm以下、好ましくは０．５μm以上１μm以下であるのがよく、膜厚が０．２μmよりも薄いと、所望の耐食性を達成できない場合があり、反対に、５μmよりも厚くなると、所望の紫外線反射性を達成できなくなる場合があるほか、陽極酸化処理が低電圧下で実施されるので、陽極酸化処理の処理時間が長くなり過ぎて作業性が低下し、製造コストが高くなる。 In the present invention, the thickness of the anodized film formed on the surface of the aluminum material is not particularly limited, but is usually 0.2 μm or more and 5 μm or less, preferably 0.5 μm or more and 1 μm or less. If the film thickness is less than 0.2 μm, the desired corrosion resistance may not be achieved. On the other hand, if the film thickness is greater than 5 μm, 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.
本発明の表面処理アルミニウム材は、分光光度計（株式会社パーキンエルマー製ラムダ７５０Ｓ）を用い、標準白色板（株式会社ラブスフェア製スペクトラロンSRS-99）を標準反射板として紫外線反射率を測定した結果、細菌やウィルスに対する殺菌効果に優れた波長２５４nmの紫外線に対する反射率が５０%以上であって、波長２００〜４００nmの範囲の紫外線に対する平均反射率が７０%以上であり、優れた紫外線反射性を有している。また、本発明の表面処理アルミニウム材は、単に紫外線反射性に優れているだけでなく、４０℃で人工水道水に浸漬する過酷な淡水浸漬試験（JIS S 3200-7）において試験前後で紫外線反射率を維持しており、優れた耐食性を有している。 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 on bacteria and viruses, reflectivity for UV light with a wavelength of 254 nm is 50% or more, average reflectivity for UV light in the wavelength range of 200 to 400 nm is 70% or more, and has excellent UV reflectivity Have. In addition, 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.
また、本発明の表面処理アルミニウム材の外観については、優れた紫外線反射性を有する皮膜においては、b*値の色調が−６以上１以下の範囲にある。これは、シュウ酸陽極酸化処理により生成した皮膜中のアノード酸化物の濃度が原因と考えられ、アノード酸化物の濃度は陽極酸化処理の電圧や皮膜の膜厚に左右されるためである。 As for the appearance of the surface-treated aluminum material of the present invention, 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.
従って、本発明の表面処理アルミニウム材は、紫外線反射性及び耐食性の両性能が共に優れているので、医療・食品関連消毒装置、浄水や空調を目的とした紫外線殺菌装置や樹脂硬化装置の紫外線反射材として好適に用いることができる。 Therefore, 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.
本発明の表面処理アルミニウム材は、紫外線反射性及び耐食性が共に優れているので、紫外線反射部材としての用途を始めとして、これらの性能を生かした建築材料、車両用材料、電子・電気機器材料、器物、一般機械、箔製品等の多くの用途に有用な表面処理アルミニウム材である。 Since 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.
また、本発明の紫外線反射部材は、優れた紫外線反射性及び耐食性を有しているので、健康医療機器、食品関連消毒装置、浄水設備や空調設備に付設される紫外線殺菌装置、紫外線硬化性樹脂を硬化させるための樹脂硬化装置等の各種の機器や装置において好適に用いられる。 Further, since 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.
以下、実施例及び比較例に基づいて、本発明の実施の形態を具体的に説明する。
＜実施例１〜３及び比較例１〜６＞
〔アルミニウム材について〕
純度９９．９９%の高純度アルミニウム（JIS A1050）からなる厚さ０．４mmの板材から０．４mm×５０mm×５０mmの大きさのアルミニウム材を切り出した。
Hereinafter, based on an Example and a comparative example, embodiment of this invention is described concretely.
<Examples 1-3 and Comparative Examples 1-6>
[About aluminum materials]
An aluminum material having a size of 0.4 mm × 50 mm × 50 mm was cut out from a 0.4 mm thick plate made of high purity aluminum (JIS A1050) having a purity of 99.99%.
〔前処理〕
次に、切り出されたアルミニウム材について、前処理として以下の処理を施した。先ず、30wt%-硝酸水溶液に常温（２０℃）で３分間浸漬した後に純水で洗浄し、次いで、5wt%-水酸化ナトリウム水溶液に５０℃で３分間浸漬した後に純水で洗浄し、更に、30wt%-硝酸水溶液に常温（２０℃）で３分間浸漬した後に純水で洗浄した。
〔Preprocessing〕
Next, 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.
〔陽極酸化処理〕
得られた前処理後のアルミニウム材について、以下に示す電解液を用い、また、以下に示す処理条件で陽極酸化処理を実施し、アルミニウム材の表面に陽極酸化皮膜を形成した。
[Anodizing treatment]
The obtained pretreated aluminum material was subjected to an anodizing treatment using the electrolytic solution shown below and under the following treatment conditions to form an anodized film on the surface of the aluminum material.
電解液としては、０．３モル(M)濃度のシュウ酸水溶液（シュウ酸電解液）又は２モル(M)濃度の硫酸水溶液（硫酸電解液）を用いた。また、処理条件については、浴温度１８℃で表１に示す印加電圧の下に、表１に示す膜厚が得られるまで陽極酸化処理を実施した。
なお、比較例６においては、以下に示す封孔処理を行わずに、ここで得られた陽極酸化処理後のアルミニウム材をそのまま比較例６の表面処理アルミニウム材とした。
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.
〔封孔処理〕
陽極酸化処理後のアルミニウム材について、耐圧容器内で１５０℃及び０．３MPaの加圧蒸気により、陽極酸化処理で形成された陽極酸化皮膜を封孔処理して実施例１〜３及び比較例１〜５の表面処理アルミニウム材を得た。
[Sealing treatment]
Examples 1 to 3 and Comparative Example 1 were performed by sealing the anodized film formed by the anodizing treatment with 150 ° C. and 0.3 MPa pressurized steam in the pressure vessel for the anodized aluminum material. ~ 5 surface treated aluminum material was obtained.
〔紫外線反射率の測定〕
上記実施例１〜３及び比較例１〜６の表面処理アルミニウム材について、分光光度計（株式会社パーキンエルマー製ラムダ750S）を用い、波長２５４nmの紫外線に対する反射率、及び、波長２００〜４００nmの紫外線に対する平均反射率をそれぞれ測定した。この紫外線反射率の測定において、標準反射板として標準白色板（株式会社ラブスフェア製スペクトラロンSRS-99）を使用した。
結果を表１に示す
[Measurement of UV reflectance]
About the surface-treated aluminum materials of Examples 1 to 3 and Comparative Examples 1 to 6, using a spectrophotometer (Lambda 750S manufactured by PerkinElmer Co., Ltd.), the reflectance with respect to ultraviolet light having a wavelength of 254 nm and ultraviolet light having a wavelength of 200 to 400 nm The average reflectance with respect to was measured. In the measurement of the ultraviolet reflectance, a standard white plate (Spectralon SRS-99 manufactured by Labsphere Co., Ltd.) was used as a standard reflector.
The results are shown in Table 1.
〔耐食性試験〕
上記実施例１〜３及び比較例１〜６の表面処理アルミニウム材について、４０℃の人工水道水に浸漬し、水道水浸漬１週間後に腐食の進行度合と紫外線反射率とを調べた。
また、この際に、比較例７〜９として、上記の陽極酸化処理及び封孔処理を行わない未処理アルミニウム材（JIS A1050）、同じく未処理ＳＵＳ３０４材、及び未処理ＳＵＳ３１６材についてそれぞれ腐食の進行度合と紫外線反射率とを調べ、実施例１〜３の表面処理アルミニウム材と比較した。
[Corrosion resistance test]
The surface-treated aluminum materials of Examples 1 to 3 and Comparative Examples 1 to 6 were immersed in artificial tap water at 40 ° C., and the progress of corrosion and the ultraviolet reflectance were examined after 1 week of tap water immersion.
At this time, as Comparative Examples 7 to 9, the progress of corrosion for the untreated aluminum material (JIS A1050), the untreated SUS304 material, and the untreated SUS316 material that are not subjected to the above-described anodizing treatment and sealing treatment, respectively. The degree and ultraviolet reflectance were examined and compared with the surface-treated aluminum materials of Examples 1 to 3.
この耐食性試験において、試験前後で紫外線反射率を維持していた場合を「○」とし、また、試験前後で紫外線反射率が低下した場合を「×」として評価した。
また、実施例１〜３及び比較例１〜６の表面処理アルミニウム材と、比較例７〜９の未処理アルミニウム材及び未処理ＳＵＳ材について、測定された紫外線反射率、評価された耐食性、及び比較例７〜９の結果を基に、紫外線反射部材としての使用価値を総合的に判断し、３段階（◎：優、○：良、×：不可）で総合評価を行った。
結果を表１に示す
In this corrosion resistance test, the case where the ultraviolet reflectance was maintained before and after the test was evaluated as “◯”, and the case where the ultraviolet reflectance decreased before and after the test was evaluated as “x”.
Moreover, about the surface-treated aluminum material of Examples 1-3 and Comparative Examples 1-6, and the untreated aluminum material and untreated SUS material of Comparative Examples 7-9, the measured ultraviolet reflectance, the evaluated corrosion resistance, and Based on the results of Comparative Examples 7 to 9, the use value as an ultraviolet reflecting member was comprehensively evaluated, and comprehensive evaluation was performed in three stages (◎: excellent, ○: good, ×: not possible).
The results are shown in Table 1.
Claims (4)
前記陽極酸化皮膜は、シュウ酸電解液を用いた電圧１０〜３０Vの定電圧陽極酸化処理で形成されていると共に、この陽極酸化処理後に封孔処理が施されており、また、
波長２５４nmの紫外線に対する反射率が５０%以上であって、波長２００〜４００nmの範囲の紫外線に対する平均反射率が７０%以上であることを特徴とする表面処理アルミニウム材。 A surface-treated aluminum material having an anodized film on the surface of an aluminum material made of aluminum or an aluminum alloy,
The anodized film is formed by a constant voltage anodizing treatment with a voltage of 10 to 30 V using an oxalic acid electrolyte, and is subjected to a sealing treatment after the anodizing treatment,
A surface-treated aluminum material characterized by having a reflectance of 50% or more for ultraviolet light having a wavelength of 254 nm and an average reflectance of 70% or more for ultraviolet light having a wavelength in the range of 200 to 400 nm.
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| PCT/JP2014/069171 WO2015019828A1 (en) | 2013-08-05 | 2014-07-18 | Surface-treated aluminum material and uv-ray- reflecting member using same |
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|---|---|---|---|---|
| JPS5430785U (en) * | 1977-08-03 | 1979-02-28 | ||
| JPH08225992A (en) * | 1995-02-16 | 1996-09-03 | Showa Alum Corp | Ultraviolet ray diffusing and reflecting plate |
| JP2001281426A (en) * | 2000-03-31 | 2001-10-10 | Kobe Steel Ltd | Ultraviolet ray reflection plate |
| JP2011190466A (en) * | 2009-03-11 | 2011-09-29 | Fujifilm Corp | Aluminum alloy substrate, and substrate for solar cell |
| JP2012136749A (en) * | 2010-12-27 | 2012-07-19 | Fujifilm Corp | Light reflecting substrate |
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| JP4748720B2 (en) * | 2006-03-13 | 2011-08-17 | 日本軽金属株式会社 | Multi-layer coating formation method |
| JP2012201891A (en) * | 2011-03-23 | 2012-10-22 | Fujifilm Corp | Insulating substrate and wiring substrate, semiconductor package and led package each using the insulating substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5430785U (en) * | 1977-08-03 | 1979-02-28 | ||
| JPH08225992A (en) * | 1995-02-16 | 1996-09-03 | Showa Alum Corp | Ultraviolet ray diffusing and reflecting plate |
| JP2001281426A (en) * | 2000-03-31 | 2001-10-10 | Kobe Steel Ltd | Ultraviolet ray reflection plate |
| JP2011190466A (en) * | 2009-03-11 | 2011-09-29 | Fujifilm Corp | Aluminum alloy substrate, and substrate for solar cell |
| JP2012136749A (en) * | 2010-12-27 | 2012-07-19 | Fujifilm Corp | Light reflecting substrate |
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