Journal of the Metal Finishing Society of Japan

[title in Japanese]

[in Japanese], [in Japanese]

1962 Volume 13 Issue 12 Pages 497-502
Published: December 20, 1962
Released on J-STAGE: October 30, 2009

DOIhttps://doi.org/10.4139/sfj1950.13.497

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Immersion Gold Plating

Takuya HATA, Takeaki HANADA

1962 Volume 13 Issue 12 Pages 503-507
Published: December 20, 1962
Released on J-STAGE: October 30, 2009

DOIhttps://doi.org/10.4139/sfj1950.13.503

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Immersion gold plating has hitherto been roughly classified into displacement plating and chemical plating, both of which have been unsatisfactory in plating rate and plating thickness.
This paper reports the development of a displacement plating solution of new mechanism. The solution containing such active metallic ions as Zn, Co, Ni, Cu, etc., so to speak double displacement type solution, has double plating rate and markedely thicker plating is possible in this solution.
The exalting mechanism of the newly developed solution with active metallic ion could almost be made clear by observing the electrode potential and the initial plating appearance.

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Some Factors Affecting Drawing Amount

Juro Ota, Tsuyoshi ISHIKAWA

1962 Volume 13 Issue 12 Pages 507-510
Published: December 20, 1962
Released on J-STAGE: October 30, 2009

DOIhttps://doi.org/10.4139/sfj1950.13.507

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In order to minimize the amount of dragout and to obtain the reproducible data, behaviors of factors affecting the drawing amount should be studied. Among many factors involved, physical properties of plating solution, such as viscosity and surface tension, and the shape of edge of specimen were investigated in the present study.
The effect of viscosity on the amount of dragout changes according to the speed of withdrawal or to the thickness of the liquid film. Decrease of surface tension increases the volume of drainage and decreases the volume of bead on the edge. With the surface tension less than 40 dyne/cm the amount of bead of edge becomes constant regardless of thickness of adhearing film. The amount of bead of the dragout is generally more than 50% of that of static drainage.

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Descaling Speed and Polarization Characteristics

Study on Ultrasonic Pickling (1st Report)

Yoshio HARADA, Akio NISHIKAWA

1962 Volume 13 Issue 12 Pages 510-514
Published: December 20, 1962
Released on J-STAGE: October 30, 2009

DOIhttps://doi.org/10.4139/sfj1950.13.510

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As it is said that the ultrasonic wave energy has excellent effect in pickling of steels, the ultrasonic pickling of mild steels was tested under the following conditions:
(1) Solutions: -3% and 5% hydrochloric acid solutions and 5% sulfuric acid solution.
(2) Pickling temperature: -22°C and 50°C.
(3) Applied ultrasonic waves: -resonant frequency 42kc/s±2kc/s, power 150W.
(1) When steels are pickled with the above mentioned acid solutions at room temperature, the emitting of ultrasonic waves accelerates the descaling speed remarkably. But with warm sulfuric acid solution the effect is not so remarkable.
(2) When ultrasonic waves are applied, the increase of descaling speed is accompanied by an increase of loss of materials and the effect of inhibitors is considerably poor.
(3) With ultrasonic pickling little or no hydrogen is generated, according to the conditions.
(4) The electrode potential of the steel exposed to ultrasonic waves is shifted to the noble side, and the steel does not seem to be polarized.

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Effect of Organic Addition Agent in Acid Stannous Sulfate Bath

Studies on Bright Tin Plating (Part 1)

Nobuyasu DOHI, Shiro TAKASHIMA

1962 Volume 13 Issue 12 Pages 515-521
Published: December 20, 1962
Released on J-STAGE: October 30, 2009

DOIhttps://doi.org/10.4139/sfj1950.13.515

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Effect of the organic addition agent to acid stannous sulfate bath was studied by Hull cell test and cathode polarisation measurement. Crystal structure of the deposit from the bath was analysed by X-ray diffraction method.
Addition of organic compounds, such as wood tar, styrenated phenol, product of amin and aldehyde, that of amin and ketones, etc., to the acid stannous sulfate bath with surface activating agent (sodium n-octyl sulfate) made the polarisation potentials of tin, higher up to 130-400mV at 1.5A/dm².
Brighting agents, lyophobic and weakbasic materials, gave good results in Hull cell test, and showed anionic action in diluted sulfuric acid solution.
These addition agents seem to form stable micelles as activating agent and complexes with tin ions in the solution.
Acting as carriers micelles and complexes would advantageously convey the brighting agent to the cathode.
In the solution over cathode surface of higher pH, micelles would probably lose their balance, and free lyophobic brightner adheres to the growing deposit.
Bright tin deposit has fine crystals, however, the brightness is mostly due to the orientation of crystals.
As to the full bright deposit, only one face (112, 330) was observed by X-ray diffraction.

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[title in Japanese]

[in Japanese]

1962 Volume 13 Issue 12 Pages 522-530
Published: December 20, 1962
Released on J-STAGE: October 30, 2009

DOIhttps://doi.org/10.4139/sfj1950.13.522

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