Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
Search
Advanced search
OR
Browse
Search
Volume 56, Issue 8
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
RESEARCH REPORT
  • Effect of alloying elements on the change of hydrogen content in Al–Mg alloys during annealing
    Hidetoshi UMEDA, Goroh ITOH, Yoshinori KATO
    2006 Volume 56 Issue 8 Pages 423-428
    Published: 2006
    Released on J-STAGE: September 30, 2006
    DOIhttps://doi.org/10.2464/jilm.56.423
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    It is known that hydrogen in aluminum alloys causes blistering. In this study, the effect of alloying elements on the change of hydrogen content during heat-treatment in Al–Mg based alloys was investigated. As a result, the change of hydrogen content during heat-treatment is affected by not only humidity of atmosphere but also alloying elements. The oxide film on the surface is revealed to prevent the hydrogen from being released to outside. In Al–4mass%Mg based alloys, spheroidal MgO particles can be seen on the surface of the annealed specimens. The number of the MgO particles increases with increasing impurity elements, reducing the shielding effect of oxide film against hydrogen. Therefore, the condensation of hydrogen near the surface after annealing occurs more easily in an Al–Mg alloy of a high-purity than that of an commercial purity.
    View full abstract
    Download PDF (2698K)
  • Effect of surface roughness on glossiness and surface color for an anodized 5052 aluminum alloy plate
    Makiko YONEHARA, Shinji KUMAI, Hiroaki ISONO, Toshio SUGIBAYASHI, Naoh ...
    2006 Volume 56 Issue 8 Pages 429-434
    Published: 2006
    Released on J-STAGE: September 30, 2006
    DOIhttps://doi.org/10.2464/jilm.56.429
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The effect of surface roughness on glossiness and surface color for anodized 5052 aluminum alloy plates were investigated. The surface roughness of aluminum alloy plate was controlled by processing of shot blasting to satisfy the condition of arithmetical mean roughness, Ra, less than 1.0 μm. The specimens with several different conditions were prepared: shot blasting, anodizing after blasting, and, in addition, it dyed it to red, green and blue respectively. CIELAB (L*a*b* color system) was applied to the surface color evaluation method. The results of experiments, the glossiness value, Gs (60°), increased as decreasing Ra. The lightness, L*, decreased as decreasing Ra. The hue angle, hab, of the anodized surface changed into the green direction. The a, b chroma, C*ab, decreased as decreasing Ra of the anodizing red and blue specimens. However, the a, b chroma, C*ab, increased as decreasing Ra of the anodizing green specimen. This was caused by the fact that the hue angle, hab, changes into the green direction by anodizing.
    View full abstract
    Download PDF (1626K)
  • Effect of EDTA on corrosion behavior of 1100 pure aluminum
    Osami SERI, Yuuki HOSHI
    2006 Volume 56 Issue 8 Pages 435-440
    Published: 2006
    Released on J-STAGE: September 30, 2006
    DOIhttps://doi.org/10.2464/jilm.56.435
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Surface observation and electrochemical measurements were carried out to clarify the influence of EDTA (ethylenediaminetetracetic acid) on corrosion behaviors of industrially pure aluminum alloy 1100. The consideration of the potential-pH-pY diagram and polarization analysis reveal that co-existence of EDTA and chloride ions in an environment will severely pitting-attack the aluminum alloy 1100. Pitting occurrence by co-existence of EDTA and chloride ions is ascertained by the fpitAl (pitting occurrence factor for aluminum), which gives us a way of checking whether pitting attacks will occur or not.
    View full abstract
    Download PDF (2458K)
  • Development of 2117 aluminum alloy rivets of large diameter and their strength properties
    Nobuyasu HAGISAWA, Ichiro OKURA, Setsuo IWATA, Koji KITAMURA
    2006 Volume 56 Issue 8 Pages 441-447
    Published: 2006
    Released on J-STAGE: September 30, 2006
    DOIhttps://doi.org/10.2464/jilm.56.441
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this study, 2117 aluminum alloy rivets of large diameter are produced and investigated on the properties of strength of them. Extruded round bars are used for the rivets of 22 mm in nominal diameter. First, the forming and heat treatment conditions not so as to generate large grains in the section of the rivets are examined. Next, it is shown that by pressing under cold condition the end of the shank of the rivets into the flat head of 32 mm in diameter and 10 mm in height, the hole of 22.8 mm in diameter is full of the rivet. The static loading and fatigue tests for the joints fabricated by the developed rivets provide the shear strength and the fatigue strength in shear of the rivets.
    View full abstract
    Download PDF (1353K)
  • Effect of baked temperature on the coating film formability of pre-coated aluminum sheets under drawing
    Nobuo HATTORI, Masaki TANIGAWA, Masazumi OKIDO
    2006 Volume 56 Issue 8 Pages 448-453
    Published: 2006
    Released on J-STAGE: September 30, 2006
    DOIhttps://doi.org/10.2464/jilm.56.448
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Pre-coated aluminum sheets with surface functions are used in various fields. To prevent from peeling off of the coating film by forming, formability of the coating film is important. This study was investigated to develop pre-coated aluminum sheet that can be transformed by drawing forming. Polyester film with glass transition temperature of 273 K had the best formability in our experiments. When the baked temperatures were above 523 K or below 423 K, coating film had good formability. When the baked temperatures were between 443 K and 503 K, peeling off of the coating film were observed. Below 423 K, the cross-linking between the resinous molecules were not sufficient, the coating film had high elongation enough to transform largely. Above 523 K, the strong adhesion of coating film enhanced formability. For the coating film of pre-coated aluminum sheet transformed by hard condition forming, it is important to increase the elongation and adhesion of the coating film.
    View full abstract
    Download PDF (778K)
REVIEW
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top