巻号一覧
14 巻, 9 号
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林 忠夫, 石田 武男1963 年 14 巻 9 号 p. 343-349
発行日: 1963/09/20
公開日: 2009/10/30
ジャーナル フリーStudy was made to establish the new chromate process in which zinc deposits were plated first using a proper addition agent followed by the chromate treatment using dilute chromate solutions.
The bright zinc deposits were treated with the following types of chromate solutions:
A) CrO3 200g/l, H2SO4 20g/l B) Na2CrO7 200g/l, H2SO4 10g/l
C) CrO3 10g/l, H2SO4 0.5g/l D) CrO3 5g/l, Cr2(SO4)3 10g/l
The determination of the corrosion resistance was conducted by both Neutral Salt Spray Test (JIS Z-2371) and also by the pulse polarizer method.
Using dilute chromate solutions such as, C) and D), golden yellow films were obtained whose protective power is fairly good and comparable with those obtained from the conventional chromate solutions such as, A) and B).
Comparative tests revealed that all the chromated zinc deposits stood up to the salt spray test for 96hrs. (JIS Specification), but the zinc plated panels treated with concentrated chromate solutions exhibited a smaller rust area after the conclusion of the test (336hrs.).
It was also found that the pulse polarizer method could be applied for the evaluation of the protective power of the chromated zinc deposits.抄録全体を表示PDF形式でダウンロード (2677K) -
桑 義彦, 鈴木 隆, 野田 保夫1963 年 14 巻 9 号 p. 350-354
発行日: 1963/09/20
公開日: 2009/10/30
ジャーナル フリーCuprocyanide copper plating bath containing benzoic acid and selenious acid was found to be suitable for the plating under appreciably large current densities, keeping the deposit in fairly bright appearance. In this case, cyanide copper bath to be used, the cyanide bath of CuCN-KCN is preferable to that of CuCN-NaCN.
A number of surface active substances of various types were examined to see whether any of them could be used to improve the brightness of the deposit. NF Roughness Tester was employed in measuring the brightness, comparing the reflectivity of the samples with that of the standard aluminium plated specimen.
As a result it was found that small addition of some surface active substance of non-ionic type gave striking effects to improve the brightness. The bright deposits obtained by the use of surface active agent, have the characteristics of lamellar structure by microscopic examination and also of prefered orientation of the crystal by electron diffraction. The plating bath above mentioned may be used under suitable conditions up to current density of 9A/dm2.抄録全体を表示PDF形式でダウンロード (1544K) -
林 忠夫, 石田 武男1963 年 14 巻 9 号 p. 355-360
発行日: 1963/09/20
公開日: 2009/10/30
ジャーナル フリーBoth galvanostatic and potentiostatic methods have been applied for the measurement of the electrochemical polarization effects at various nickel anodes in nickel sulfate, nickel chloride, nickel sulfamate and also Watts type nickel solutions in order to determine the anodic dissolution reactions involved.
The nickel plates tested are as follows:
1) Electrolytic nickel (SP) 2) Carbonized nickel
(CP) 3) Neo-carbonized nickel (NP) 4) Depolarized nickel (DP)
In chloride-free nickel sulfate and nickel sulfamate solutions, all the nickel anodes studied except DP nickel tend to become passive at low current densities.
The addition of chloride ions to the nickel sulfamate bath had the remarkable effects of raising the minimum current density required to passivate nickel anodes such as SP, NP and CP nickels.
In nickel chloride and also Watts type nickel solutions, the smooth current-voltage curves were obtained for all nickel anodes studied showing any passivation effect in these solutions.
The potentiostatic measurements revealed that the various types of anode potential-current density curves were observed for the different kinds of anode examined. The DP nickel plate was found to have the smaller passive regions corresponding to the high reactivity of the nickel surface in sulfate and sulfamate solutions.抄録全体を表示PDF形式でダウンロード (718K) -
小西 三郎1963 年 14 巻 9 号 p. 360-365
発行日: 1963/09/20
公開日: 2009/10/30
ジャーナル フリーAfter a series of experiments the following solution was found to be suitable to dissolve zinc or cadmium film plated on iron base metal:
NH4NO3 100g/l
conc. NH4OH 550cc/l
Tri ethanolamine 50g/l
The solution is made to act as buffer at pH 10, and the mean thickness of zinc or cadmium film plated on the steel surface of certain area can be easily and precisely measured by means of titration with EDTA, using BT as indicator.
Slight amount of iron is dissolved into this solution but it does not interrupt the analystical process for the dissolved iron produces complex salt with tri ethanolamine.抄録全体を表示PDF形式でダウンロード (779K) -
黒柳 一雄1963 年 14 巻 9 号 p. 366-373
発行日: 1963/09/20
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (1563K)
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