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Volume 29, Issue 6
Displaying 1-8 of 8 articles from this issue
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Ishi MIURA1979Volume 29Issue 6 Pages 217-218
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
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Takeshi MEGURO, Naochika TORIKAI, Yoshitaka KOBAYASHI1979Volume 29Issue 6 Pages 219-222
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThis woek relates to the safety of aluminum pastes contacting with water in transportation or on storage. Pastes containing aluminum powders 50 to 90wt%, and stamped and atomized powders were tested. Hydrogen gas volume evolved on the reaction in a thermostat at 30°C was measured as a function of reactivity. The aluminum pastes and stamped powder are free from the reaction with water. The atomized powder easily reacts. The aluminum pastes are also free from reactions with hydrochloric acid and sodium hydroxide solution at pH 2 to 11. Any indications of the dust explosion are unrecognized. The aluminum pastes seem to be quite safe for the reaction with water.View full abstractDownload PDF (764K) -
Motohiro KANNO, Hisashi SUZUKI, Osamu KANOH1979Volume 29Issue 6 Pages 223-226
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe authors reported that θ' phases heterogeneously precipitate on small black spots formed at the just early stage of high temperature aging of a ternary Al-Cu-Sn alloy resulting in the aging acceleration. The present work was undertaken to make clear whether the black spots are really Sn-rich phases or not by means of a energy dispersive X-ray spectroscope mounted on a transmission electron microscope. The black spots are proved to consist of Sn atoms as predicted by the authors. Sn atoms are not absorbed at the interface between θ' and matrix reversely to the theory by Hardy et al. The Sn-rich phases will play an important role even in precipitation of θ" or G.P. zones.View full abstractDownload PDF (1599K) -
Kinji OMATA, Kimiyasu MAEDA, Takehiko ODA, Yoshihisa OTAKA1979Volume 29Issue 6 Pages 227-231
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIt is a problem awaiting solution whether polymer in paint vehicle for electro-deposition permeates into micropores in anodic oxide films on aluminum or not. Depth profiles of the component of the anodic oxide films were recorded repeating Ar+ sputter etching. The specimens were extracted from practical extrusions electrodeposited and baked or unbaked and those dipped and baked or unbaked. Paint films were removed in conc. H2SO4. No carbon is detected in the micropores in the anodic oxide films. On the viewpoints of accuracy of Auger electron spectroscopy for carbon and of coverage for carbon of paint vehicle permeated in the micropores, the fact mentioned above contradicts such a hypothesis that which polymer permeates into the micropo.View full abstractDownload PDF (1067K) -
Ken TOHMA, Yo TAKEUCHI1979Volume 29Issue 6 Pages 232-239
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSElectrochemical polarization measurements in 3% NaCl aqueous solutions were carried out to estimate corrosion rate and resistance to pitting corrosion of aluminum alloys. The corrosion rate quantitatively agrees with that corresponding to the cathodic current density extrapolated to corrosion potential. The resistance to pitting corrosion can be estimated from the potential difference ΔE between pitting initiation potential Epit and repassivation potential Erep of anodic polarization curves. The smaller ΔE values of the alloys, the more resistant to pitting corrosion.View full abstractDownload PDF (1004K) -
Tadashi MOMONO, Katsuya IKAWA1979Volume 29Issue 6 Pages 240-245
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSMolten hypereutectic Al-17%Si alloys stirring in the electromagnetic field at a rate 10cm/s were unidirectionally solidified at cooling rates 1.0 to 3.2°C/s. Both primary and eutectic Si are refined by intermittent stirring during solidification in a cycle of 30s in the alloys free from such grain refiners and modifiers as P and Na. The alloys solidified in this way have the tensile strength higher than that of the alloys unstirred. Gravity segregation of the primary Si is intensified by the continuous convective flow, but is effectively diminished by the intermittent one.View full abstractDownload PDF (1156K) -
Kunio ITO1979Volume 29Issue 6 Pages 246-248
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (284K) -
Self-diffusion and impurity diffusionKen-ichi HIRANO1979Volume 29Issue 6 Pages 249-262
Published: June 30, 1979
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (1672K)
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