巻号一覧
8 巻, 4 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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福島 穰1957 年 8 巻 4 号 p. 77-83
発行日: 1957/06/13
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (2803K) -
通電初期における核の成長過程について岸 松平1957 年 8 巻 4 号 p. 84-89
発行日: 1957/06/13
公開日: 2009/10/30
ジャーナル フリーNuclei are formed on base metals at early stage of electro-plating process. These nuclei seem to perform an important role of connecting base metal and electro-deposit in the process of electroplating on anodized surfaces. So it seems that the more nuclei are formed, the more firmly electrodeposit adheres on base metal.
Observations on the formation and growth of nuclei in a copper plating on anodized surfaces treated respectivly with a sulphuric acid, oxalic acid and phosphoric acid bath, are reported in this paper.
The results are as follows:
i) The number of nuclei formed is maximum on the surface treated with phosphoric acid, next with oxalic acid and minimum with sulphuric acid.
ii) Anodized conditions affect the formation of nuclei extensivly with sulphuric acid bath and less with phosphoric acid bath, the effect with oxalic acid bath being between the above two.
iii) The formation of nuclei is seen only on flaws of base metal in the case of sulphuric acid bath, but it has hot nothing to do with the flaws in the case of phosphoric acid bath.抄録全体を表示PDF形式でダウンロード (3341K) -
電極電位測定による被覆性状観察上田 益造1957 年 8 巻 4 号 p. 90-95
発行日: 1957/06/13
公開日: 2009/10/30
ジャーナル フリーThe surfacial state of the lead coated steel by hot dipping and its coating mechanism are investigated. The author thought that it was an effective method both theoretically and practically to estimate the surfacial state of the specimen by measuring the electrode potential, however, it seemed to be much influenced by many factors. The results obtained are as follows:
1). The steel specimen is coated very nicely when dipped into the lead melt of a bit higher temperature than the melting point.
2). According to dipping time, the coating mechanism was found to be divided into two steps, namely the primary coating and the secondary coating, the former being made chiefly by the reaction of the used flux. The flux used works effectively at the beginning of coating reaction and the primary coating ends in two minutes. The thicker the specimen, the more excellently it is coated in the primary coating. The latter is made by direct intermetallic reaction requiring rather long dipping time, e. g., about five minutes.
3). If the flux is used in solution of SbCl3, the specimen had better be immersed into it for a short time at room temperature, but in that of ZnCl2, SnCl2 or NH4Cl at raised temperature, for which the treatment time is little responsible.抄録全体を表示PDF形式でダウンロード (857K) -
呂 戊辰, 押切 芳之1957 年 8 巻 4 号 p. 95-100
発行日: 1957/06/13
公開日: 2009/10/30
ジャーナル フリーImitation gold should have the properties of unchangeable color and easy workability. The former has many problems to be solved ahead, while the problems of the latter have mostly been solved so far. The authors made investigations how to prevent the color change from various angles.
Many specimens of imitation gold alloys of different composition were prepared and each epecimen was treated with the solution of sodium thiosulphate. Pure gold was used as standard with which the variation of color was compared.
The result was as follows:
The color of the alloy that is not plated changes easily, depending on the uniformity of the alloy. Remarkable examples are the phenomena of loss of zinc of the surface and precipitation of cadmium sulphide.
On the other hand, the alloys deposited in the bath with gold added, have excellent properties against change of color, and the compositions of the alloy are classified into three groups of Cu-Zn-Au, Cu-Zn-Ni-Au, and Cu-Zn-Au-Cd-Ni. The maximum content of gold is 20% and it is necessary to contain at least 5-7% of gold. Over 5% of gold, it is mostly possible to prevent color change, however, under 5% only temporarily.抄録全体を表示PDF形式でダウンロード (749K) -
光沢剤の適否と最適条件中村 実1957 年 8 巻 4 号 p. 100-103
発行日: 1957/06/13
公開日: 2009/10/30
ジャーナル フリーIt was found that KCNS, SeO2 and As2O3 in the copper cyanide plating bath were the most suitable brighteners as observed from cleanness of reflection image.
The range of brilliance was studied to decide the best composition and working condition when SeO2 brightener was used. At the same time, the potassium copper cyanide bath was compared with the sodium copper cyanide bath. The result is as follows:
The range of brilliance is wide and the current density high with high copper concentration, low free alkali cyanide, high K+ concentration, and high temperature.
Furthermore, it is better to use potassium copper cyanide bath than sodium bath.
For the reason above, it is recommendable to use bright copper cyanide bath under the following condition:
Bath Composition
Cu 60-70g/l
free CN- 5-10g/l
KOH 20g/l
SeO2 1g/l
Working Condition
Temperature 70-75°C
Current density 2A/dm2
It is also revealed that, by stirring the bath, higher current density can be used for wider range of brightness.抄録全体を表示PDF形式でダウンロード (569K) -
鈴木 信利1957 年 8 巻 4 号 p. 104-115
発行日: 1957/06/13
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (3758K)
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