金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
35 巻, 7 号
選択された号の論文の6件中1~6を表示しています
  • 堀池 靖浩
    1984 年 35 巻 7 号 p. 322-333
    発行日: 1984/07/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 高橋 節子, 小浦 延幸, 井手本 康
    1984 年 35 巻 7 号 p. 334-343
    発行日: 1984/07/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 莚 正勝
    1984 年 35 巻 7 号 p. 344-348
    発行日: 1984/07/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 滝沢 貴久男, 志水 康彦, 樋口 義弘, 田村 今男
    1984 年 35 巻 7 号 p. 349-353
    発行日: 1984/07/01
    公開日: 2009/10/30
    ジャーナル フリー
    The corrosion behavior of austenitic stainless steels was investigated in solutions of L-ascorbic acid (C6H8O6), which is thought to be a material having a corrosive action on stainless steel, by measuring anodic polarization curves. It was found that C6H8O6 had an aggressively corrosive action on stainless steels. The critical current density for passivation of the specimens increased with increasing C6H8O6 content up to about 10%, but above that level had a tendency to decrease. C6H8O6 tended to accelerate the cathodic reaction, but, for easily corroced specimens such as SUS 303, it mainly accelerated the anodic reaction. The addition of NaCl to C6H8O6 solutions enlarged the active region of the anodic polarization curves of the specimens and pitting potentials had a tendency to become less noble. Further, the passive potential region of those curves become narrow. In the active region, the matrix of the specimens dissolved preferentially at potentials less noble than the passivation potential (anodic current maximun in the active region), while MnS inclusions dissolved preferentially at potentials equal to or more noble than the passivation potential. At potentials more noble than the penetration potential, which corresponded to reincreasing current after passivation, shallow localized corrosion occurred, whereas in the pitting potential region in solutions containing NaCl, pitting began from MnS or MnSe inclusions.
  • 松林 宏, 黒川 亘, 佐野 広喜
    1984 年 35 巻 7 号 p. 354-358
    発行日: 1984/07/01
    公開日: 2009/10/30
    ジャーナル フリー
    The microstructure, uniformity and growth rate of metallic chromium films that were electroplated both continuously and intermittently in a solution of CrO3 50g/l, H2SO4 0.5g/l, up to a thickness of about 100nm on steel and iron, were studied by means of transmission electron microscopy, electron diffraction and X-ray energy spectrometry. During continuous plating for periods shorter than 4 seconds, platelike chromium film grew epitaxially on iron substrate and the crystallographic relation between them was as follows. Fe (001)||Cr(001), Fe[110]||Cr[110] Fe(111)||Cr[110]||Cr[110] In continuous plating for periods longer than 4 seconds, and in intermittent plating, metallic chromium grew in various forms and in various crystallographic orientations. In continuous plating, platelike chromium grew in (111) grains for which the growth rate was constant. In (001) chromium grains, modified pyramidlike chromium formed on the platelike chromium. The mean growth rate up to a thickness of of 15nm was the same as for the (111) chromium grains after which a low growth rate stage was observed followed by a high growth rate stage. In intermittent plating, (001) chromium grains a large amount of granular chromiums grew on the initial deposited platelike chromium, and the mean growth rate increased as much as threefold after the current was interrupted. In (111) chromium grains only a small amount of granular chromiums formed, and the mean growth rate was almost the same as in continuous plating. The uniformity of the (111) chromium grains was better than that of the (001) grains in both continuous and intermittent plating.
  • 松田 均, 鷹野 修
    1984 年 35 巻 7 号 p. 359-363
    発行日: 1984/07/01
    公開日: 2009/10/30
    ジャーナル フリー
    The growth of microstructure and magnetic properties of electroless Co-P films (30nm-1500nm) deposited on PET films are examined. The influence of film thickness and solution parameters such as the ratio of the concentration of cobalt ion to that of hypophosphite are discussed with respect to the microstructure and coercive force of the films. 1) The coercive force of Co-P films is dependent on film thickness and the maximum coercive force appears to shift to higher film thickness with decreasing the ratio of Co2+ to H2PO2- in the solution. 2) The grain size of Co-P films is affected by solution parameters and it increases with increasing Co2+/H2PO2- ratio. In all the films investigated, the average grain size develops with increasing film thickness. 3) The observation of the magnetic domain by means of Lorentz method revealed that grains with a diameter of 50-100nm behave as single domain particles and the dependence of coercive force on film thickness can be explained by changes in the magnetization mechanism.
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