Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 29, Issue 7
Displaying 1-7 of 7 articles from this issue
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  • These 10 years of ISO/TC79/SC2
    Takakado NAKAYAMA
    1979Volume 29Issue 7 Pages 263-265
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.263
    JOURNAL FREE ACCESS
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  • Performance test on alkaline cleaners for aluminum alloys
    Fujio MAMIYA
    1979Volume 29Issue 7 Pages 266-272
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.266
    JOURNAL FREE ACCESS
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    This test on alkaline cleaners for pretreating in a corrosion control process is concerned with corrosive actions of the cleaners, rinsabilities, effects on painted surfaces of aluminum, cleaning abilities and waste disposal. The results may be summarized as follows. 1) Dipping type alkaline cleaners are more corrosive than spray type ones on the basis of weight change of aluminum alloys. 2) The residue of the former is also more corrosive than that of the latter. 3) Some dipping type cleaners over-etch aluminum alloys in regular alkaline cleaners.
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  • Performance test on acidic cleaners for aluminum alloys
    Fujio MAMIYA
    1979Volume 29Issue 7 Pages 273-279
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.273
    JOURNAL FREE ACCESS
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    This test on acidic cleaners for pretreating in a corrosion control process is concerned with corrosive actions of the cleaners, corrosion by residues, effects on painted aluminum, and reflectance effects. Dipping type acidic cleaners are more corrosive than spray type ones on the basis of weight change of aluminum alloys. The residue of the former is also corrosive that of the latter. Spray type acidic cleaners increase reflectance readings, but dipping type ones decrease them. Dipping type acidic cleaners over-etch than regular spray type ones.
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  • Combustion behaviors of 25kg aluminum paste in a pail can
    Naochika TORIKAI, Takeshi MEGURO, Yoshitaka KOBAYASHI
    1979Volume 29Issue 7 Pages 280-284
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.280
    JOURNAL FREE ACCESS
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    Commercial aluminum paste containing 65wt% aluminum powder in a pail can was heated in the open air and combustion behaviors were tested. 20l mineral spirit in the pail can was also examined in the same way. Only combustion of the solvent is observed both in opened and sealed cans. No explosion takes place and any indications of dust explosion are unrecognized during the combustion processes of aluminum paste. Fire of aluminum paste at the beginning period is easily extinguished using a portable extinguisher. Violent explosion takes place of the mineral spirit in the sealed pail can.
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  • Oxidation of molten Al-Mg alloy in air-CO2 atmosphere
    Ikuo HAGINOYA, Tatsuichi FUKUSAKO
    1979Volume 29Issue 7 Pages 285-290
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.285
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    Aluminum alloys containing magnesium 2 to 12% gain weight during melting at 750°C for 180min in the air-15%CO2 mixture less than in air. The fact may be caused not by decrease in O2 partial pressure in the atmosphere but by an oxidation inhibition effect of CO2. When the Al-10%Mg alloy is melted in the air containing various concentrations of CO2 at 700° to 850°C, the oxidation inhibition effect of CO2 is related to the stable period observed after surface film formation in an early stage of holding. The stable period is prolonged in the air containing higher concentration of CO2 at a constant temperature, and is shortened at elevated temperatures. Both high purity and commercial purity CO2 in the atmosphere reduce the oxide on the Al-10%Mg alloy melted at 750°C.
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  • The relationship between the solidified structures of aluminum alloy castings and the solidification parameters
    Tadashi MOMONO, Katsuya IKAWA
    1979Volume 29Issue 7 Pages 291-296
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.291
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    Molten Al-1 at% Zn, Mg, Cu and Si and Al-0.1 to 4.5 at% Cu alloys electromagnetically flowing at a rate approximately 10cm/sec were unidirectionally solidified. The constitutional supercooling parameter [|mL|(1-k0) C0/k0], the freezing temperature range [TL-TS] and the segregation coefficient [1-k0] as parameters for the tendency toward formation of equiaxed zone are principally identical. A linear relationships between the percentage of columnar crystal zone and the reasonable parameters are further pursued in terms of the convective flow during solidification.
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  • Aluminum casting alloy for automobile wheel
    Makoto TSUKUDA, Toshio SUZUKI
    1979Volume 29Issue 7 Pages 297-312
    Published: July 30, 1979
    Released on J-STAGE: October 30, 2008
    DOIhttps://doi.org/10.2464/jilm.29.297
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