金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
17 巻, 8 号
選択された号の論文の5件中1~5を表示しています
  • コバルトおよびその合金の無電解メッキに関する研究 (第1報)
    鷹野 修, 石橋 知
    1966 年 17 巻 8 号 p. 299-304
    発行日: 1966/08/20
    公開日: 2009/10/30
    ジャーナル フリー
    The relation between the precipitation velocity and the composition of bath was studied on acidic or alkaline electroless baths consisting of cobalt sulfate and sodium hyposulfite, including buffers and additives. As the results of experiments, it was shown that all acidic baths containing organic acids were not in practical use because of so small precipitation velocity as lower than 1μ/h, while caustic or ammonical alkaline baths containing citrate or tartrate gave a considerable velocity as high as 10-15μ/h at 90±1°C.
    The precipitation velocity was remarkably increased by the addition of boric acid (0.5mol) into caustic alkaline baths, and the surface state of deposits was improved by the addition of ammonium sulfate (0.6mol) into ammoniacal alkaline bath.
    The optimum composition of bath for practical use was as follows:
    (1) Caustic alkaline citrate bath (pH=7-8-NaOH); 0.1mol CoSO4, 0.2mol NaH2PO2, 0.2mol Na-citrate, and 0.5mol boric acid.
    (2) Caustic alkaline tartrate bath (pH=9-NaOH); 0.08mol CoSO4, 0.2mol NaH2PO2, 0.5mol Na-tartrate, and 0.5mol boric acid.
    (3) Ammoniacal alkaline citrate bath (pH=9-10-NaOH); 0.07mol CoSO4, 0.2mol NaH2PO2, 0.2mol Na-citrate, and 0.6mol (NH4)2SO4.
    (4) Ammoniacal alkaline tartrate bath (pH=9-10-NaOH); 0.08mol CoSO4, 0.2mol NaH2PO2, 0.5mol Na-tartrate, and 0.6mol (NH4)2SO4.
  • 桑 義彦, 芦田 正安, 石西 清輝
    1966 年 17 巻 8 号 p. 305-309
    発行日: 1966/08/20
    公開日: 2009/10/30
    ジャーナル フリー
    Polarization characteristics and corrosion behavior of electro-plated copper and nickel were determined in neutral NaCl solution saturated with air. By the determination of steady-state potential, current-potential curves, and corrosion rate of each test piece of electroplated Cu and Ni, the following conclusions were reached.
    In NaCl solution, the steady-state potential of nickel was obtained within 24h, but even if very small cathode current was applied, the steady potential of Ni could hardly be attained in more than 24h.
    On the other hand, it was found that steady-state potential of Cu was given within 8h with or without application of external current in the same NaCl solution.
    It was also found that corrosion of electroplated nickel in neutral NaCl solution was very little when no external current was applied; whereas, copper gave a considerable loss of weight in the same solution.
    It was observed that the polarity of the electrode potential in Cu-Ni couple was reversed in NaCl solution; i. e., Cu was anodically dissolved. The result would be explained by the gradual change of the static potential of each electrodeposited metal with the time in the above solution.
    For steel-Cu couple, galvanic corrosion of steel was remarkably accelerated, because steell was always anodic to Cu in NaCl solution. Whereas, for steel-Ni couple, the corrosion of steel was found to be not so remarkable in the same solution.
  • 金属粉末による鋼板の被覆 (第1報)
    下瀬 高明, 森 憲二, 井上 公雄
    1966 年 17 巻 8 号 p. 310-315
    発行日: 1966/08/20
    公開日: 2009/10/30
    ジャーナル フリー
    With the object of coating titanium on mild steel sheet, a novel method was investigated by the authors. The method consisted of the following processes; at first, applying titanium powder on the mild steel sheet previously treated with adhesives, drying, pressing the powder on steel by rolling, and sintering the titanium layer in vacuum for bonding it with steel. Aqueous solution of potassium polymetaphosphate was used as adhesives. Sintering was carried out at 900-1000°C. The coating layer was about 25μ in thickness, but it was about 50μ when the powder was applied 2 times. The coating layer was continuous and revealed good adhesion to steel. The corrosion rates of the layer at room temperature were lower than the following values, respectively; 0.063mm/year in 10% HNO3, 0.053mm/year in 1% H2SO4, and 0.0047mm/year in 3% aqueous NaCl solution.
    Workability was tested by bending the coated sheet over mandrels of various diameters. Fine cracks were observed on the coating layer when the coated sheet was bent over a mandrel of less than 140mm in diameter. It was found that such formation of cracks was caused by the hardening of the coated titanium layer due to the diffusion of Fe from the substrate. Such phenomena of diffusion were confirmed by electron probe X-ray microanalysis and X-ray diffraction.
  • 光沢スズ電気メッキに関する研究 (第6報)
    土肥 信康
    1966 年 17 巻 8 号 p. 316-320
    発行日: 1966/08/20
    公開日: 2009/10/30
    ジャーナル フリー
    Analytical method of cresol sulfonic acids in stannous sulfate bath was studied by spectrophotometer. These cresol sulfonic acids were produced from the isomers of high purity cresol. The data on extinction was determined in the neighborhood of their ultra-violet spectra.
    In case of measuring absorption stannous sulfate plating solution, it was essential to take into account of the effects of precipitation of stannous salt or addition agents due to lowering of acidity. Accordingly, the testing solution had to be diluted to a definite concentration with about, 1% HCl solution and it had to the compared with the plating solution free from cresol sulfonic acid prepared by dilution in the same manner.
  • 長坂 秀雄
    1966 年 17 巻 8 号 p. 321-323
    発行日: 1966/08/20
    公開日: 2009/10/30
    ジャーナル フリー
feedback
Top