金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
38 巻, 1 号
選択された号の論文の6件中1~6を表示しています
  • 特にELD, LCDおよびECDについて
    馬場 宣良
    1987 年 38 巻 1 号 p. 2-6
    発行日: 1987/01/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 久保田 昇, 千田 伸, 佐藤 栄一
    1987 年 38 巻 1 号 p. 7-11
    発行日: 1987/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    The behavior of thiourea and potassium tetracyanonickel (II) as additives has been studied with a view to obtaining a good surface of gold electrodeposit from a gold pyrophosphate solution. Gold exists in pyrophosphate solution as a gold cyanic complex salt without combining with pyrophosphate. The current-potential curve at gold electrodeposition is not affected by additives. Addition of either thiourea or potassium tetracyanonickel (II) resulted in good surface conditions of gold electrodeposits. Analysis of both surfaces showed no impurities and it considered that it was the difference in the strength of crystal orientation that produced good surface conditions. The co-electrodeposited potassium, however had a deleterious effect or the surface condition of gold electrodeposit.
  • 平松 実, 川崎 仁士, 小見 崇, 中山 豊
    1987 年 38 巻 1 号 p. 12-15
    発行日: 1987/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    The effect of treatment with γ-aminopropyltriethoxy silane (γ-APS) on the corrosion resistance of zinc-silica composite which was electroplated onto mild steel substrate has been studied by salt spray testing, measurement of spontaneous electrode potential in concert with contact angle to water, and FT-IR spectroscopy. Composite surface roughness was regulated with the aid of surfactants in the bath. The red rusting time of non γ-APS treated composite containing 3.6wt% of 0.018μm silica particles was found to be 1200hr, which corresponds to about twelve times the salt spray resistance of the pure and fan-shaped zinc electroplate of the same mean thickness. A red rusting time of 2800hr was recorded when the same sample was treated with γ-APS solution. Spontaneous electrode potential measurement of the nontreated composite showed that a protective film is formed on the composite surface in 5% NaCl solution. The excellent red rusting resistance of the treated composite is ascribed to formation of a chemically fixed hydrophobic layer on the composite surface.
  • 樋口 征順, 大賀 智也, 三宅 紀次, 山口 康一, 大八木 八七
    1987 年 38 巻 1 号 p. 16-24
    発行日: 1987/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    Recent rapid advances in welding methods for manufacture of cans has made it desirable to develop new and economical materials.
    Experiments were performed showing that the best chromate layer on nickel plating was obtained by electrolytic cathodic treatment in a CrO3-SO42-bath. From the viewpoint of weldability and lacquered performance, the optimum weight of chromium coating was found to be 3-15mg/m2. It is considered that the chromate layer consists of metallic chromium, insolble chromium oxide and hydrated chromium oxide.
    Pack tests prove that nickel plated steel sheet with chromate treatment has characteristics that make it an excellent material for welded cans.
  • 若林 信一, 若林 静子
    1987 年 38 巻 1 号 p. 25-29
    発行日: 1987/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    A method of chemical analysis of citrate in high speed silver plating solution was developed. It consists in complexing citrate with excess copper ions and back titration of the copper ions with a standard EDTA solution. In this case, it was necessary to decompose free cyanide in solution with ammonium persulfate since it was revealed to interference the titration.
    Potentiometric titration curves measured with platinum indicator electrode were helpful in determining the proper titration condition.
  • 佐藤 登
    1987 年 38 巻 1 号 p. 30-34
    発行日: 1987/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    Under zinc phosphating condition of Zn2+: 800ppm, Ni2+: 800ppm, Mn2+: 600ppm, and F-: 500ppm, zinc phosphate crystals were formed on the various types of steel sheets. The chemical properties of these crystals were first determined by X-ray diffraction and atomic absorption. The morphology and the chemical properties of the crystals differed according to the kind of steel.
    The chemical component distribution of Hopeite crystal formed on galvannealed (GA) and electrogalvanized (EG) steels, and that of the Phosphophyllite crystal formed on cold rolled (CR) steel were analyzed by XPS and IMA. XPS showed that there was no Mn and Ni in the surface region of Hopeite, and that there was no Ni in the surface region of the Phosphophyllite. Comparing IMA intensity ratio patterns for Mn/Zn, Ni/Zn, Fe/Zn and P/Zn, the ratios for GA and EG were similar, but that for CR was different.
    Correlating XPS with IMA, Mn was found to be present in the surface region of the Phosphophyllite crystal, and the crystal structure was considered as Zn3-x(Fe, Mn)x (PO4)2, 4H2O. Mn and Ni were not present in the surface region of Hopeite crystals, but only in the bulk of the crystal. Therefore, the crystal structure of the surface region of Hopeite was considered as Zn3(PO4)2⋅4H2O, and that of the bulk was considered as Zn3-xMnx(PO4)2⋅4H2O.
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