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Volume 10, Issue 12
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1959 Volume 10 Issue 12 Pages 437-440
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSDownload PDF (630K) -
Hot-dip Aluminum Coating on Steel: Rept. 7Masayoshi TAGAYA, Shigeteru ISA, Yasuhiko MIYAKE1959 Volume 10 Issue 12 Pages 441-446
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSThe e. m. f. of mild steel/Al or Al alloy cells in various aqueous solutions at room temperature was investigated for one week. Al and Al alloy electrodes coupled with mild steel were pure Al (99.99%), commercial Al (98%) and commercial Al containing 5% Si, 0.2% Be or both.
In city and distilled water, 98%Al+0.2/Be alloy usually protects steel as sacrificial anode, but other Al and Al alloys reverse the potential within 100hr. In 1M or M/10 sodium chloride solution, every Al or Al alloy provides sacrificial protection to steel, except in the case of 99.99%Al or 98%Al which shows potential reversal after longer time immersion, In dilute sulphuric acid solutions, Al is nobler (cathodic) than steel at the instance of immersion but immediately steel becomes cathodic. Then the potential difference gradually decreases and finally Al becomes cathodic. Only 99.99%Al does not reverss the potential except in very dilute M/6000 solution. In the aluminum sulphate solution, the potential is almost always reversed.
As described above, Al or Al alloy does not always protect the steel, accordingly, the coating should prerequisitely be free from pinholes or cracks. But the addition of Be to Al improves the resistance to corrosion.View full abstractDownload PDF (848K) -
Toshio YAMADA1959 Volume 10 Issue 12 Pages 447-450
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSTo improve the color of deposition, various agents were added to brass baths of 0.13 A/dm2 of current density and 58°C of temperature
The change of color of the deposition was observed by drawing the distribution of spectrums of the luminous reflectance by Beckman spectro photomater, in order to show the change according to the JES standard. (1) In the spectro charcteristic curve, the minimum point moves to the side of short wave length with the increase of yellow color, and the blighter the yellow color, the more evidently appears the minimun point. (2) In the chromaticity diagram, the best color deposit exists in the middle of the dominant wanelength between 570 and 580mμ, the purity being 30%, and the luminosity within the limits between 27 and 33.View full abstractDownload PDF (495K) -
Matsuhei KISHI1959 Volume 10 Issue 12 Pages 450-452
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSThe copper plated aluminum shows less resistivity against corrosion due to the galvanic action caused by corrosive elements if existing. Various chemical treatments are tried in order to find the better condition for giving the anti-corrosive property to the plated aluminum.
As a result, the better anti-corrosive property is obtained by dipping it in the chromic acid bath of 30-60°C for 2-5min. The plate thus treated is 5-7 times more resistant against the salt spray than the untreated one.View full abstractDownload PDF (849K) -
Studies on Aluminum Alloy Enameling: Rept 2Toshio YAMADA1959 Volume 10 Issue 12 Pages 453-458
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSBefore enamelling, plates of aluminum alloys were treated anodic oxidation with mono and mixed aqueous solutions of sodium metasilicate, sodium perborate or lithium borate, and the adhesion of enamel was investigated measuring bending, tensile and thermal shock.
(1) Aluminum alloy plates pretreated by anodic oxidation with mono or mixed aqueous solution sodium metasilicate, sodium perborate or lithium borate showed better adhesiveness than those of treated chemically or without treatment.
(2) It was easy to get glossy and transparent enamel by anodic oxidation with mixed aqueous solution.
(3) The strength of test samples by chemical treatment and those without treatment was lower than those by anodic oxidation.
(4) The enamel on the plate chemically pretreated or no treatment showed good resistance for thermal shock.
The enamel was transparent in the case of anodic oxidation, and gray or brown in the case of chemical or no treatment. Hence, by using colored frit from the beginning, a single enamelling process would be sufficient to get proper shade.View full abstractDownload PDF (787K) -
Sogoro YAMAGUCHI, Juro OTA, Tsuyoshi ISHIKAWA1959 Volume 10 Issue 12 Pages 458-461
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSPhenol sulphonic group compounds contained as additional agents to the plating bath is usually determined by gravimetric or photo-colorimetric method. But such methods are too troublesome to be practiced actually.
Therefore, a more convenient method of titrating with alkaline solution is worked out by the present study.
For example, the determination of crezol sulphonic acid in acidic tin plating bath is as follows:
1. Pipette a 5cc sample into a 250cc erlenmeyer flask.
2. Add 50cc of distilled water.
3. Add a few drops of methylorange and thymolphthalein.
4. Titrate with standard N/5 sodium hydroxide solution until a blue color is obtained.
The crezol sulphonic acid in g/l equals:
{(CCNaOH required until a blue color is obtained)-(CCNa OH required until a yellow color is obtained)}×37.8{normality of NaOH}View full abstractDownload PDF (1193K) -
Shozo YOSHIOKA, Hisashi YAMAMOTO, Hirozo KIDA1959 Volume 10 Issue 12 Pages 461-464
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSThe strength of adhesion of Cr layer electrodeposited on zinc-clad Al and Al alloys was compared, respecting to the different methods of treatment as follows: (1) Heat treatment at 380°C for 20min, in vacuum or in cracked town gas atmosphere was done after Zn intermediate electrodeposit was formed from cyanide bath on substrata which had been previously etched with some one of six kinds of acidic or alkaline solution. (2) Heat treatment was not done.
The results were: (1) On pure Al plate, adhesion was found to be pretty firm regardless of the heat treatment and the kind of etching reagent. (2) On Al Alloys of D (17S), SD (24S) and ESD (75S), heating in vacuum was effective for the stronger adhesion independently of the kind of etching reagent, though in the case of absence of heat treatment, the exfoliation was occasionally found preceding the fracture of substratum in bending test. (3) Heating in cracked town gas gave considerable improvement in regard to the adhesion, but the effect was not so remarkable as that of heating in vacuum.View full abstractDownload PDF (507K) -
[in Japanese]1959 Volume 10 Issue 12 Pages 465-471
Published: December 20, 1959
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSDownload PDF (1824K)
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