Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 68, Issue 2
Displaying 1-7 of 7 articles from this issue
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RESEARCH ARTICLE
  • Corrosion behavior of superhydrophobic film fabricated on AZ31B magnesium alloy by one-step immersion process in NaCl aqueous solution
    Yuta Shimada, Mika Tsunakawa, Tetsuya Yokomizo, Hoonseung Lee, Takahir ...
    2018 Volume 68 Issue 2 Pages 57-64
    Published: February 28, 2018
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.2464/jilm.68.57
    JOURNAL FREE ACCESS
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    Superhydrophobic film was prepared on magnesium alloy AZ31B by one-step immersion process for 30 min. The solution for immersion process was composed of an aqueous solution containing Ce(NO3)3 and ethanol containing myristic acid. The water contact angle of the prepared film was more than 150 degree and found to be superhydrophobic. The film was composed mainly of crystalline myristic acid. The corrosion behavior of the superhydrophobic film in 5 mass% NaCl aqueous solution were investigated by polarization curve. The corrosion resistance was considerably improved by preparing the superhydrophobic film. In addition, the corrosion process of the superhydrophobic AZ31B was also investigated using XRD, SEM, and water contact angle measurement.

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  • Development of high-strength bolt material of Al–Mg–Si alloy by ECAP and various aging treatments
    Tomoyasu Obata, Yongpeng Tang, Hideaki Iwaoka, Shoichi Hirosawa, Keiki ...
    2018 Volume 68 Issue 2 Pages 65-72
    Published: February 28, 2018
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.2464/jilm.68.65
    JOURNAL FREE ACCESS
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    At present, the strength of most of Al–Mg–Si alloy bolts is not enough, and thus highly expected to be increased, for example, to >500 MPa in ultimate tensile strength (UTS). In this study, mechanical strength of A6056 Al–Mg–Si alloy was aimed at improving, without diminishing the elongation, by combined application of equal-channel angular pressing (ECAP) and various aging treatments. Multi-pass ECAP and pre-aging (PA) treatment at 373 K for 1.2 ks was found to be effective in strengthening the bolt material subject to room-temperature storage followed by artificial aging. Especially, PA plus ECAP 2pass treatment exerted the biggest impact on the strength (i.e., 514 MPa in UTS) with a reasonable elongation to fracture (i.e., 16%). Such a high strength and good ductility exceeds minimum requirement for aluminum-made bolts registered in JIS B1057, and thus the developed PA-ECAP 2pass specimen can be utilized potentially as a high-strength bolt material.

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  • Synthesis of double oxide NiTiO3 using dissolution phenomena of titanium and nickel
    Daichi Sasaki, Yoshiyuki Yonaiyama
    2018 Volume 68 Issue 2 Pages 73-76
    Published: February 28, 2018
    Released on J-STAGE: March 30, 2018
    DOIhttps://doi.org/10.2464/jilm.68.73
    JOURNAL FREE ACCESS
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    Attempts have been made to synthesize nickel titanate (NiTiO3) using dissolution of nickel and titanium. The powders obtained by calcinating the mixture corrosion products at a temperature more than 873 K was identified as NiTiO3 by XRD analysis. The NiTiO3 powders which obtained after the calcination at 1473 K had the diameters from 0.4 to 6.5 µm, and a median of the size distribution of 2.3 µm. Preparation of NiTiO3 using corrosion synthesis is discussed from the viewpoint of electrochemistry.

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