金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
39 巻, 5 号
選択された号の論文の8件中1~8を表示しています
  • 金子 克美
    1988 年 39 巻 5 号 p. 244-251
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    Real solid surfaces have a hierarchy comprising texture or aggregate-structure, pore structure, atomic structure, and electronic structure. Molecular adsorption processes on real solid surfaces are characteristically influenced by the structure at each level in the hierarchy. The hierarchy should thus be taken into account in the classification of molecular adsorption processes on real surfaces. The three main processes of physical adsorption are layer-by-layer adsorption on flat surfaces and macropores, capillary condensation on mesopores, and micropore filling on micropores. The important factors in chemisorption are the electronic properties of both the adsorbents and adsorptives and accessibility of the surface site to the adsorptive. Systematic research on the molecular adsorptivity of real solid surfaces can even now be expected to identify fundamental and interesting adsorption process of a new type. Two anomalous adsorption processes that have been studies recently, fast chemisorption and micropore filling of a super critical gas, are introduced.
  • 松田 茂樹, 松原 保, 白銀 嘉二, 森 和彦
    1988 年 39 巻 5 号 p. 252-259
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    A new process for phosphate conversion (“normal-temperature zinc phosphate conversion process”) has been developed and applied for the paint pretreatment processes of auto parts etc. The conventional zinc phosphate conversion process was generally performed in a bath heated to 40°C or more. Such a heated bath high temperature bath. However posed problems such (1) difficult process control and (2) large energy consumption. We determined the zinc phosphate conversion reaction to be an electrochemical reaction and then developed a new chemical conversion treatment which can be automatically controlled at normal temperature.
  • 沖 猛雄, 兼松 秀行
    1988 年 39 巻 5 号 p. 260-265
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    Surface hardening of SKD 11 was investigated by immersing it into a molten salt consisting of KCl-BaCl2-NaF-B2O3-ferroboron at temperatures of 1073K-1273K. It is thought that a disproportionation reaction in molten salts enables the chemical transportation of boron from a powder source to the surface by means of the process that-can be described as follows.
    2B3++B (powder source)→3B2+
    3B2++2Fe→2B3++Fe2B (surface layer)
    Film thickness grows with an increase in the temperature and treatment time, respectively. The interface between the Fe2B layer and the substrate was wedge-shaped. The Vickers hardness in the vicinity of the surface reached about 1600. This process increased wear resistance, but did not improve corrosion resistance.
  • 久保田 昇, 大沢 宏一, 佐藤 栄一
    1988 年 39 巻 5 号 p. 266-269
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    An EDTA solution is proposed as a means of obtaining a stable electrodeposited film of silverpalladium alloy, and its properties, deposition characteristics and crystal structure have been studied. In the EDTA solution used, palladium exists in the form of a complex with ethylenediamine in a ratio of 1:2, while silver exists as a cyanate. The composition of the alloy deposit obtained was 80% silver and 20% palladium, and it was found to be satisfactory in terms of hardness and wear resistance. The deposit was single -phase solid solution with no remarkable orientation. Its characteristics and surface condition were affected by the pH of the solution.
  • 森田 有彦, 井上 正二, 竹添 明信
    1988 年 39 巻 5 号 p. 270-275
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    The spot weldability of zinc vapor-deposited steel sheets (VZ) and galvannealed steel sheets (VZA) was investigated. Weldability lobes of VZA are approximately equal to those of hot-dip galvannealed sheets, and broader than those of VZ or hot-dip galvanized sheets. Electrode life depends on both welding conditions and surface conditions, but is independent of both the coating process, (i.e., zinc vapor deposition, hot-dip galvanizing, electro-galvanizing) and the alloying process. Electrode life increases with increasing welding current and electrode tip diameter, but decreases with increasing welding time and coating weight. Electrode life in the welding of VZA is 1.4-1.6 times longer than in the case of VZ. Γ phase (Fe3Zn7), γ phase (Cu5Zn8) and β phase (CuZn) are observed at the electrode faces for welding both VZ and VZA, γ phase is so brittle that its growth rate affects electrode wear. A high rate of growth of γ phase and a narrow weld current range both contribute to short electrode life when welding VZ and heavy coated VZA.
  • 山下 嗣人, 羽賀 昇
    1988 年 39 巻 5 号 p. 276-279
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    The effect of inorganic and organic additives on the electrodeposition or electrodissolution of zinc in aqueous zinc bromide solution has been studied by the faradaic impedance method. The reaction velocity for zinc decreased when additives were used, but the rate-determining step in the process of zinc deposition was scarcely influenced. The characteristics of the charging-discharging cycle was found to be much improved by the presence of Sn2+ ion in the bath.
    It was confirmed that the oxide film on the anode is removed by the reduction of Sn2+ ion.
  • 佐藤 忠夫, 戸田 茂雄, 太刀川 哲平
    1988 年 39 巻 5 号 p. 280-281
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    The formation of Pb-Sn and Pb-In alloy films having specific compositions has been attemped by vacuum vapor deposition with a single evaporation source. It was possible to prepare films containing 95-98% Pb form a Pb-Sn system, and 85-95% Pb from a Pb-In system. It was very difficult, however, to prepare films having a Pb content lower than those values.
  • 保田 昌樹, 辻 弘美, 尾形 幸生, 日根 文男
    1988 年 39 巻 5 号 p. 282-284
    発行日: 1988/05/01
    公開日: 2009/10/30
    ジャーナル フリー
    The characteristics of Fe-Cr-Ni ternary alloys electrodeposited from the chloride-glycine baths were investigated. It was estimated with the results of the AES measurement and the X-ray diffraction analysis that glycine and hydroxide of iron and/or nickel were codeposited with the constituent metallic species on the cathode in amorphous form. However, the deposits were converted into f.c.c. in structure by heat treatment at 700°C.
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