軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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50 巻, 11 号
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研究論文
  • 電解コンデンサ用アルミニウム箔の直流エッチング性に及ぼす焼なまし前酸化皮膜の影響
    多田 清志, 粟屋 庫太
    2000 年 50 巻 11 号 p. 590-593
    発行日: 2000年
    公開日: 2007/03/30
    DOIhttps://doi.org/10.2464/jilm.50.590
    ジャーナル フリー
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    In case of application of high purity aluminum for capacitor, tunnel pits are required in order to expand the surface area. These pits are generated before completion of dissolving oxide films formed on aluminum during final annealing process immersed in 1 M HCl solution. The pit generation is aflfected by thickness and quality of the oxide films formed not only during final annealing but also before final annealing. For increasing electrostatic capacitance, it is necessary to generate the tunnel pits uniformly at the beginning of etching and then continue to do until pit density comes up to a specified value. It was found that optimized thickness of oxide films before final annealing was required to be formed to fulfill these requirements.
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  • 電気化学的処理と化学吸着によるアルミニウム表面の超はっ水化
    成田 緑, 春日 司, 清谷 明弘
    2000 年 50 巻 11 号 p. 594-597
    発行日: 2000年
    公開日: 2007/03/30
    DOIhttps://doi.org/10.2464/jilm.50.594
    ジャーナル フリー
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    In order to decrease frost on an air conditioner's fins, super water-repellent aluminum is required. Two requirements for the super water-repellent surface are reported, i.e., (1) roughness surface (large surface area) and (2) water-repellent functional group on the surface. Using both electrolytic etching and anodic oxidation made the aluminum rougher. During anodic oxidation, small pits were made in the large pits due to electrolytic etching. During the process of water-repellent treatment, a silane surfactant was used. The surfactant was attached to the aluminum by the Al–O–Si unit. For water-repellency, a fluoroalkyl group is better than an alkyl group. Fluoroalkylsilane, whose fluoroalkyl group is longer than C = 6, show super water-repellency, because many CF2 functional groups appear on the surface.
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  • 陽極酸化したAl–Mn合金の皮膜色調と遠赤外線放射特性
    鈴木 義和, 村松 俊樹, 松尾 守, 前嶋 正受, 猿渡 光一, 岡田 健三
    2000 年 50 巻 11 号 p. 598-602
    発行日: 2000年
    公開日: 2007/03/30
    DOIhttps://doi.org/10.2464/jilm.50.598
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    A study on color and far-infrared emissivity of anodic oxide film of strip cast Al–Mn based alloy was conducted. Sulfuric anodized film of strip cast Al–2.0%Mn alloy containing fine Al6Mn precipitates reveals black color. These precipitates do not oxidized during anodizing and exist as metallic Al6Mn phase in anodic film. A superior far-infrared emissivity was recognized on the black anodic film of strip cast Al–1.8%Mn alloy. The anodic film has very complex structure with irregular pore as the result of Al6Mn precipitates. Film hardness and resistance to heat crack was found also superior. A good radiation property of the black anodized film was confirmed. Application of far-infrared radiation contributes to effective heating and to saving energy.
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  • 二段階電解法により作製したチタン陽極酸化皮膜の光触媒活性
    倉木 淳, 渡辺 伸男, 岩崎 光伸, 多田 弘明, 伊藤 征司郎
    2000 年 50 巻 11 号 p. 603-608
    発行日: 2000年
    公開日: 2007/03/30
    DOIhttps://doi.org/10.2464/jilm.50.603
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    Anodic oxide film of titanium with photocatalytic activity was successivery prepared by re-anodization of anodized titanium film. Porous anodized plate of titanium are more than 5 μm thick in a mixture of H3PO4, H2SO4 and H2O2 over spark discharging voltage. The glay thick anodized film was photocatalytic inactive regardless of the film consisting of anatase TiO2. Low valent titanium oxides of the thick anodized film were tried to remove by re-anodizing in the mixture of NH4HF2 and H2O2 to sustain photocatalytic activity as low valent titanium oxides deactivate the photocatalytic properties. After re-anodization (second anodization) L* value (lightness) increased. The value depends on re-anodizing condition. Photocatalytic activity was generated by second anodizing. L* value and photocatalytic activity is remarkably changed under second anodizing condition although XRD, GDOES and XPS spectra showed no difference between first and second anodized films. From the results of ESR measurement, the low valent titanium oxides in anodized film were decreased by the second anodizing.
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  • レーザ照射により表面再溶融処理した過共晶Al–Si合金の組織および機械的性質
    柴田 周治, 冨田 正吾, 中田 一博
    2000 年 50 巻 11 号 p. 609-613
    発行日: 2000年
    公開日: 2007/03/30
    DOIhttps://doi.org/10.2464/jilm.50.609
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    CO2 laser irradiation has been applied to modify the surface of hypereutectic aluminum (Al–23 mass%Si, Al–30 mass%Si) cast alloys. Laser beam, 3 mm in diameter, was irradiated on the alloy surface by moving them with constant velocity (5 mm/s) with beam oscillation of 5 mm in width and 100 Hz in frequency perpendicular to travel direction at 2.3 kW laser power. A part of alloy surface was partially remelted by laser irradiation. After laser beam passed, it was naturally quenched because stored heat was absorbed in specimen. The microstructure of the surface remelted layer consists of primary Si particle, primary α phase and α–Si eutectic phase. These all were very fine. The mean diameter of primary Si was about 12 μm at Al–30 mass%Si. The tensile strength of the surface remelted layer was 254–264 MPa, which was improved to about 1.8 times as that of as-cast material. In dry sliding wear against a steel counter surface, the wear resistance of the surface remelted layer was improved to 1.5–3.0 times as that of as-cast material.
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  • Ni–Al粉末を溶射した5083アルミニウム合金のレーザによる表面合金化
    冨田 正吾, 中田 一博, 佐治 重興, 久保 卓也
    2000 年 50 巻 11 号 p. 614-618
    発行日: 2000年
    公開日: 2007/03/30
    DOIhttps://doi.org/10.2464/jilm.50.614
    ジャーナル フリー
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    Formation of thick hardened layers of an order of millimeter by the laser surface alloying process has been investigated to improve the wear resistance of commercial Al–Mg alloy, 5083 plate. Laser surface alloying was carried out by melting the precoated plasma-sprayed layer with Al coated Ni powders (80 and 95 mass% Ni) together with the substrate plate by using the continuous wave CO2 laser irradiation. The thickness of the laser alloyed layer was about 1 to 4 mm depending on the plate traveling speed at constant laser power 2100 W. The microstructures of the laser alloyed layer consisted of α(Al)+Al3Ni lameller eutectic, the needle like primary Al3Ni, the dendritic Al3Ni2 surrounding by Al3Ni and the lump like AINi surrounding by Al3Ni2, and volume fraction of the compound with higher Ni content increased with increasing Ni content in laser alloyed layer. The relation between the microstructures and Ni content of the laser alloyed layer corresponded with the Al–Ni phase diagram. The hardness of laser alloyed layer increased with the increase in Ni content and reached about 700 HV in maximum. The wear resistance of the laser alloyed layer increased with the increase in hardness up to about 250 HV and showed almost saturated value even at higher hardness. Moreover, the wear resistance of the laser alloyed layer was much higher than that of the plasma-sprayed layer and was same as that of carbon steel, S50C.
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