巻号一覧
37 巻, 13 号
選択された号の論文の6件中1～6を表示しています
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導電性皮膜の形成浅原 照三, 鳥羽山 満1986 年 37 巻 13 号 p. 738-741
発行日: 1986/12/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (591K) -
野口 裕臣, 小谷 勇1986 年 37 巻 13 号 p. 742-746
発行日: 1986/12/01
公開日: 2009/10/30
ジャーナル フリーThe effect on bright depositions in ZnCl2-KCl baths of bulk pH with carboxylic acid as a buffer was studied by measurement of titration curves, Hull cell test and direct measurement of pH near the cathode using a micro-antimony electrode.
Of the carboxylic acids, acetic acid was found to be suitable as buffering agent in chloride baths. The range of current densities at which bright deposits were obtained was wider from baths with acetic acid than from ordinary baths with boric acid, when bulk pH was a little lower than the pKa of acetic acid (=4.8). The pH near the cathode in baths of pH 4.0 containing acetic acid was maintained at less than 6 even at current densities far above the limiting current, whereas pH near the cathode in baths containing boric acid reached pH above 12 when the limiting current was exceeded.
It is concluded that, since none of precipitate of Zn(OH)2 which impedes bright deposit occurs at a pH below 6, it is the buffer action of acetic acid that is responsible for the increase in the brightness range of current densities.抄録全体を表示PDF形式でダウンロード (636K) -
安藤 繁, 下尾 聰夫, 木村 弘1986 年 37 巻 13 号 p. 747-752
発行日: 1986/12/01
公開日: 2009/10/30
ジャーナル フリーThe deposition behavior of carbon on iron from CH4-H2 mixtures in the form of pyrolitic carbon and soot as well as filmy carbon and filamentous carbon at 1203-1373K has been studied. Deposition of filmy carbon and filamentous carbon on iron was observed under most reaction conditions, while pyrolitic carbon and soot were found to form in nearly pure CH4 at temperatures above 1273K and to be significantly influenced by the residence time of the gas. In the region of deposition of filmy carbon and filamentous carbon, the amount of carbon deposit decreased when a certain CH4 concentration was exceeded, and as temperature increased the CH4 concentration shifted downward. This may be caused by the fact that under such conditions the nucleation of filamentous carbon is retarded because Fe3C formed on iron dissolved into the substrate rather than decomposing. Also, even in the region of formation of pyrolitic carbon and soot, filmy carbon was found to deposit on iron at an early stage and to retard the subsequent formation of pyrolitic carbon and soot since it prevents contact between the iron substrate and CH4 gas.抄録全体を表示PDF形式でダウンロード (2333K) -
下地めっきについて松田 均, 鷹野 修1986 年 37 巻 13 号 p. 753-757
発行日: 1986/12/01
公開日: 2009/10/30
ジャーナル フリーThe effect of an undercoating layer on the structure and magnetic properties of electroless Co alloy plating films for perpendicular recording media were investigated.
The anisotropy of perpendicularly magnetized film is affected by the structure of the undercoating layer. The half width values of rocking curve (Δθ50) which represent the c-axis dispersion of magnetized films show 10-14° when amorphous Ni alloy films are used as undercoating layers. When electroless Ni-W-P alloy films oriented in the Ni (111) plane are utilized for its purpose, the value of (Δθ50) reduced to 7.1° and the values of Hc(⊥) and Hk rise to 1180 Oe and 4.3 kOe respectively. The magnetic properties of these films are well reflected in the degree of perpendicular orientation of the c-axis depending on the structure of undercoating layer.抄録全体を表示PDF形式でダウンロード (543K) -
佐藤 登1986 年 37 巻 13 号 p. 758-762
発行日: 1986/12/01
公開日: 2009/10/30
ジャーナル フリーThe influence of the concentration of Mn2+ in zinc phosphate solution on the formation of zinc phosphate crystals on cold rolled steel and electrogalvanized steel was studied. Mn content in Phosphophyllite crystal increased with the increase of Mn2+ concentration in the solution, while Fe content in the crystal decreased and Zn content did not vary. In the case of β-Hopeite crystal, the increase of Mn content caused the decrease of Zn content.
X-ray diffraction data showed that the increase of Mn content and the decrease of Fe content in Phosphophyllite crystal had no influence on the P ratio. For both Phosphophyllite and β-Hopeite crystal species, the increse of Mn content contributed to the decline of main peak intensity, and this fact supported the hypothesis that the amorphous component of zinc phosphate film was formed partially. The peak pattern of (312) & (112) of Phosphophyllite crystal varied from two peak to one peak according to the increase of the Mn content in the crystal. In the case of β-Hopeite, 2 θ of (311, 241) was declined. Therefore, it was thought that for both crystals, the structure strain of crystals was caused by the action of Mn content.抄録全体を表示PDF形式でダウンロード (570K) -
牧野 英司, 竹田 浩治, 佐藤 敏一, 菅沼 榮一, 伊藤 武, 丹野 裕司1986 年 37 巻 13 号 p. 763-768
発行日: 1986/12/01
公開日: 2009/10/30
ジャーナル フリーThe effect of the addition of NaNO3 to NaCl solutions on the pit morphology and the capacitance gain of the etched aluminum was studied. It was found that tunnel growth of pits took place during etching, and capacitance gain increased with increasing NaCl concentration and temperature, whereas etching in low-temperature dilute NaCl gave shallow square pits and low capacitance gain. During tunneling in high-temperature concentrated NaCl, both tunnel tips and tunnel walls were passivated by NaNO3, and eventually the straight growth of tunnels was prevented. On the basis of the tunnel morphology observed, a sequential pit growth model was proposed for the etching process in NaCl/ NaNO3 mixed electrolytes. The addition of NaNO3 to low-temperature dilute NaCl promoted the development of pits that were hemispherical rather than square, and promoted the radial growth and merging of these pits, resulting in graining.抄録全体を表示PDF形式でダウンロード (2824K)
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