巻号一覧
13 巻, 4 号
選択された号の論文の7件中1～7を表示しています
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青谷 薫1962 年 13 巻 4 号 p. 139-144
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (814K) -
石田 武男, 岡村 康弘, 福本 幸男1962 年 13 巻 4 号 p. 145-148
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーThere are four steps in the current-potential curve in the electrolysis of chromic acid solution containing sulfuric acid. It has been known that the current in the second step is a linear function of the quantity of the sulfuric acid. But they have not been used for the measurement of sulfuric acid owing to the poor reproducibility.
In the present study, the reproducible results were obtained by raising the current in every 15 seconds using the clean Pt electrode for the measurement of cathode potential.
It was found that there was a linear relationship between the quantity of SO42- and the limiting diffusion current in the electrolysis of CrO3 solution without Cr3+, but no remarkable effect of concentration of CrO3 in the range of 100-300g/l on the limiting current.
The current was decreased as the concentration of Cr3+ increased when Cr3+ was present in the solution. However, upon electrolytic oxidation of the solution, the limiting current corresponding to the SO42- was found to return to its original value. The limiting current was also found to increase by the agitation of the solution which could be explained by the velocity of the diffusion of SO42- to the electrode surface.抄録全体を表示PDF形式でダウンロード (545K) -
長坂 秀雄, 井上 節子1962 年 13 巻 4 号 p. 148-154
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーI had already studied that boundary layer was necessary at flame spray coating of ceramics.
The sprayed ceramics film is more closely adhered if the steel surface is first coated with boundary layer and the flame spray is carried out on it.
The change of boundary layer (hardness, state of solid diffusion and adhesive strength of film at various conditions) was investigated when the ceramics coated steel with boundary layer is exposed to high temperature in vacuum.
As a result, it was found that the boundary layer is diffused to steel and excellently bond film and steel, moreover, protect from oxidation of steel through the open pore of film at high temperature.抄録全体を表示PDF形式でダウンロード (2803K) -
電子顕微鏡によるアルミニウム表面処理の研究 (第4報)赤堀 宏1962 年 13 巻 4 号 p. 154-159
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーThe assumption that is hitherto advocated about the growing mechanism of almite (aluminum anodic oxide film) cannot adiquately explain its fine structure. The fine structure has, been observed with electron microscope, and it is found that the assumption that almite does not grow by the reaction between solid state aluminum and O-- but between liquid state aluminum and O-- would easily explain the growth of almite.
The present experiment about the growing mechanism of almite arrives at the conclusion that the latter assumption is better. The barrier layer appeares to be made from Al2O3 and Al instead of Al2O3 only, its thickness being 30-50Å regardless of forming voltage.抄録全体を表示PDF形式でダウンロード (4126K) -
小西 三郎1962 年 13 巻 4 号 p. 159-161
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーSnII in the plating solutions can usually be titrated by iodin method. SnIV therefore, must be reduced to SnII for the titration. This reduction, however, is rather difficult and might cause some error due to the oxidation by air during the course of analysis.
So, the author tried to develop a method to avoid such an error as follows:
First, SnII was titrated directly in the EDTA standard solution, masking SnIV with NH4F, keeping pH at 5.5-6.0, with pyridine-acetic acid as buffer solution and using methyltymol blue as indicator.
Next, to analyse SnII+SnIV, another portion of the solution was made acidic with HCl., to which an excess amount of EDTA standard solution was added and boild for a few minutes. Keeping the pH value of the solution between 2.5 and 3.5 with CH3COONH4 using dinitrophenol as pH indicator, it was then back titrated with ThIV standard solution with xylenol orange as indicator.
Figures obtained by this process descrived above were coincident with those given by iodin method for SnII and by gravity method for SnIV+SnII.抄録全体を表示PDF形式でダウンロード (389K) -
タングステン合金電着に関する研究 (第1報)工藤 俊之, 水野 勝三1962 年 13 巻 4 号 p. 162-166
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーThe plating condition of W-Co alloys in citrate solution and the corrosion resistance of its alloys in acid solution were investigated.
The result was as follows:
1. Optimum composition of bath was Na2WO4⋅2H2O 60gl/, CoSO4⋅7H2O 20g/l, and sodium citrate 60g/l, from which the bright deposits containing about 50% tungsten were obtained at pH 8.0, current density 5A/dm2, and temperature 70°C.
2. Alloy deposits and their tungsten contents were mainly affected by concentration of cobalt in the bath, but the effect of concentration of tungsten or sodium citrate was not so remarkable. When the plating was continued more than one hour, the deposits became grayish, and then occurred peeling.
3. The corrosion resistance of W-Co alloy deposits was found to be fairly good in HCl and HNO3 solutions, like that of W-Fe alloy deposits. W-Ni alloy deposits, however, were inferior to bath W-Co and W-Fe alloy deposits.抄録全体を表示PDF形式でダウンロード (648K) -
嵯峨 卓郎1962 年 13 巻 4 号 p. 167-177
発行日: 1962/04/20
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (6843K)
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