金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
36 巻, 3 号
選択された号の論文の6件中1~6を表示しています
  • 光田 章一
    1985 年 36 巻 3 号 p. 88-95
    発行日: 1985/03/01
    公開日: 2009/10/30
    ジャーナル フリー
  • I. XPSによる皮膜の厚さおよび化学構造の推定
    高橋 英明, 永山 政一
    1985 年 36 巻 3 号 p. 96-103
    発行日: 1985/03/01
    公開日: 2009/10/30
    ジャーナル フリー
    Pure aluminum was a) electropolished in HClO4/CH3COOH solution (E.P.)or b) chemically polished in HNO3/H3PO4 solution (C.P.) or c) immersed in H3PO4/CrO3 solution after treatment E.P. or C. P.. The films formed were analyzed by XPS to estimate thickness and chemical composition.
    It was found that the thickness of the films was in the range of about 3.5 to 5.0nm, and that appreciable amounts of electrolyte anions were included in the films. Except for phosphate the electrolyte anions included were found to be in reduced form.
    The films formed by electropolishing consisted of aluminum oxide with small amounts of OH- (or H2O) and Cl- ions, while those formed by chemical polishing included NO2- and PO43- ions.
    Immersion in H3PO4/CrO3 caused the Cl- and NO2- ions to disappear from the surface and films included high concentrations of OH- (or H2O), CrIII and PO43- ions.
  • 児嶋 佳世子, 八木 孝夫
    1985 年 36 巻 3 号 p. 104-109
    発行日: 1985/03/01
    公開日: 2009/10/30
    ジャーナル フリー
    Hypophosphite (H2PO2-) used as a reducing agent, the oxidation product of the hypophosphite, and some organic acids used as the buffers and complexing agents in electroless nickel plating baths of (sodium hypophosphite were reliably analyzed within 15 minutes by isotachophoresis) using hydrochloric acid and β-alanine (pH3.2) as the leading electrolyte and sodium caproate as the terminal electrolyte.
    Catalytically poisoning metals and Ni2+ were simultaneously determined by isotachophoresis, employing an aqueous solution of potassium acetate and tartaric acid as the leading electrolyte, and an aqueous solution of carnitine chloride as the terminal electrolyte.
    The concentration of Ni2+ obtained by isotachophoresis was almost equal to that found by EDTA titration.
    The organic acids in the electroless nickel plating bath were identified by a combined GC-MASS technique.
    Baths of hydrazine and of sodium borohydride were also analyzed by isotachophoresis.
  • 津留 豊, 深川 勝義, 松永 守央, 細川 邦典
    1985 年 36 巻 3 号 p. 110-115
    発行日: 1985/03/01
    公開日: 2009/10/30
    ジャーナル フリー
    The effects of pulsed current electrolysis (PCE) on the electrodeposition of zinc on a vertical flat electrode have been investigated by electrochemical methods, scanning electron microscopy and X-ray diffraction. The three independent parameters of PCE (pulsed current density, pulse length and pulse period) were varied within a wide range in zinc deposition from brightener-free alkaline zincate baths. Under these conditions the usual powder formation and dendrite in direct current electrolysis (DCE) could no longer be observed and PCE produced a finer grain and smoother surface. The electroformed deposits from bath B (0.369M ZnO+5.0M NaOH) had platelets of finer grain than those from bath A (0.369M ZnO+2.5M NaOH) under the same PCE conditions, and an increase in the off period resulted in poorly defined hexagonal platelets. These results suggest that the process of zinc crystallization in PCE is influenced by the increased deposition overpotential and dissolution of growth centers during the off period and that this accelerates the formation of new nucleation sites. It was also shown that smoother zinc deposits can be obtained in PCE even at the high average current density of 2.0Adm-2, which is almost the same as the limiting diffusion current density in DCE.
  • 福田 豊, 福島 敏郎, 永山 政一
    1985 年 36 巻 3 号 p. 116-123
    発行日: 1985/03/01
    公開日: 2009/10/30
    ジャーナル フリー
    The anodic behavior of copper, carbon steel and Fe-Cr-Ni alloys in 13M H2SO4 solutions has been investigated and the composition and the electrical resistance of corrosion products formed on these metals and alloys were examined. The results obtained suggest the possibility of anodizing composites of aluminum with these metals and alloys without causing severe attack on these metals.
    Anodic polarization curves show that the breakthrough potential at the beginning of transpassivation were 47.0, 31.5, 30.5 and 26.0V for Cu, carbon steel, Al and Fe-Cr (18%)-Ni (0.2%) stainless steel and that at these potentials, thin oxide films with thicknesses of 420, 240 and 240Å are formed on these metals. In the case of Cu and carbon steel, the oxide films are covered with corrosion products, the component of which were identified by X-ray diffraction, thermogravimetric analysis and chemical analysis to be CuSO4⋅3H2O and CuSO42O for Cu and FeSO4⋅H2O and Fe2 (SO4)3·H2O for carbon steel.
    In the anodization of composites, partial current passing through aluminum decreased in the order of the Al-Cu, Al-carbon steel and Al-stainless steel. For the Al-stainless steel composites, the thickness of the oxide film on aluminum increased with decreasing area of the stainless steel and the amount of nickel in it.
  • 松田 均, 西口 強志, 鷹野 修
    1985 年 36 巻 3 号 p. 124-130
    発行日: 1985/03/01
    公開日: 2009/10/30
    ジャーナル フリー
    Thin magnetic recording tapes using a PET substrate were prepared in five types of electroless plating solutions. The recording, mechanical and corrosion characteristics of these tapes were investigated.
    The electroless Co-P plated tapes exhibited high coercivity, with a maximum of about 80, 000A/m at a thickness of 0.1μm; response at frequencies above 5kHz was better than that of γ-Fe2O3 type tapes.
    The fracture elongation of the Co-P plated tapes was higher than that of vapor-deposited metal tape.
    The magnetic moment of the films decreased at a low rate as 3-5% per week on exposure to a humidity-resistance test environmet of 90% at 313K.
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