巻号一覧
36 巻, 9 号
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浅井 渡1985 年 36 巻 9 号 p. 350-354
発行日: 1985/09/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (580K) -
久保田 昇, 吉村 俊一, 佐藤 栄一1985 年 36 巻 9 号 p. 355-358
発行日: 1985/09/01
公開日: 2009/10/30
ジャーナル フリーThe relationship between current density and the properties of gold-tin alloy deposit from pyrophosphate solution containing potassium dicyanoaurate (I) and stannous pyrophosphate has been studied. The composition of the alloy depended on current density and affected hardness. The increase in current density increased the tin content of the alloy, but current density was independent of orientation, which shows the crystal form, and had no effect on an amount of wear. However, SEM photographs showed that current density has marked effect on the condition of the deposited alloy.抄録全体を表示PDF形式でダウンロード (895K) -
吉村 俊一, 千田 伸, 久保田 昇, 佐藤 栄一1985 年 36 巻 9 号 p. 359-364
発行日: 1985/09/01
公開日: 2009/10/30
ジャーナル フリーThe effect of arsenic on the electrodeposition of palladium from ethylenediamine-palladium (II) complex has been investigated in neutral ethylenediaminetetraacetic acid solution. Addition of NaAsO2 made the palladium deposition potential more noble and the deposition rate faster, and deposits having a low rate of hydrogen occlusion were obtained with high current efficiency. At potentials of -0.68- -0.75V (SCE) on the cathodic current-potential curves for deposition of palladium by the addition of NaAsO2, the Tafel slope was -0.055V·decade-1 and the reaction order of palladium ion was 1. It is thought that the arsenic is adsorbed on the electrode surface as arsenic ions, and that the adsorbed arsenic ions appear to play the role of active sites (A). The following electrodeposition mechanism was inferred.
Pd(en)22+soln+A Pd2+ads·A+2en (1)
Pd2+ads·A+2e Pdads·A (2)
Pdads·A Pdcrys+A (3-a)
That is to say, Eq. (2) is the rate determining process in the deposition of palladium in solutions containing NaAsO2, and deposition current depends on the number of active sites (A), i.e. the concentration of NaAsO2 in the solution.抄録全体を表示PDF形式でダウンロード (1039K) -
逢坂 哲彌, 小岩 一郎1985 年 36 巻 9 号 p. 365-370
発行日: 1985/09/01
公開日: 2009/10/30
ジャーナル フリーThe role of complexing agents in electroless plating baths on the properties of Co alloy films was studied with a view to obtain perpendicular magnetic anisotropy films. The increase in malonate concentration resulted in an increase in saturation magnetization, Ms. The perpendicular anisotropy energy, Ku, reached maximum at 0.6mol dm-3 malonate, while the half-breadth of the rocking curve for hcpCo (002) plane, ΔΘ50, reached minimum at 0.3mol dm-3. An increase in tartrate concentration sharply decreased the Ms value and at low additive concentrations increased the Ku value abruptly from negative to positive. The maximum Ku and minimum ΔΘ50 were obtained at 0.2mol dm-3 tartrate. The succinate improved only the ΔΘ50, reaching a minimum at 0.3mol dm-3 succinate. The above effects of the complexing agents on magnetic properties were explained by changes in the composition of the films, and the merits of mixed complexing agents in the plating bath were discussed on the basis of the results obtained.抄録全体を表示PDF形式でダウンロード (687K)
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