Journal of The Surface Finishing Society of Japan
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
Volume 71 , Issue 6
Showing 1-2 articles out of 2 articles from the selected issue
Research Papers
  • Chisato SO, Koki CHUGANJI, Yudai KITAMIKA, Hiroyuki HASEGAWA
    2020 Volume 71 Issue 6 Pages 418-422
    Published: June 01, 2020
    Released: May 30, 2020
    JOURNALS FREE ACCESS

    In this study, we evaluated the microstructure, microhardness, tribological properties, and oxidation behaviors of Zr1-XAlXN films, considering the requirements for their use as wear-resistant coatings. Zr1-XAlXN films were synthesized by radio-frequency magnetron sputtering from (ZrN)1-X-AlX targets. X-ray diffraction analysis indicated that the Zr1-XAlXN film had a cubic phase when X=0.12, being transformed into a mixture of cubic and hexagonal phases when X=0.26. Zr0.88Al0.12N displayed an average frictional coefficient of 0.3-0.5 and a minimum wear depth of 0.4 μm. The microhardness of Zr1-XAlXN decreased from 36.5 GPa for X=0.12 to 16.9 GPa for X=0.43. During dynamic oxidation, the exothermic peak in a differential thermal analysis curve shifted from 730 ℃ for X=0.12 to 835 ℃ for X=0.43. In accord with this behavior, the mass gain measured by thermogravimetric analysis for Zr0.57Al0.43N exhibited minimum values at isothermal oxidation temperatures in the range of 600-700 ℃.

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Tecnological Reports
  • Naoto TAKANE, Takashi SOMEYA, Yoshiyuki SASAKI, Yoichi OBINATA, Norihi ...
    2020 Volume 71 Issue 6 Pages 423-427
    Published: June 01, 2020
    Released: May 30, 2020
    JOURNALS FREE ACCESS

    To estimate brightener concentrations in nickel plating liquids, we applied electrochemical measurements and numerical analyses. The polarization curves of fresh nickel plating liquids at different concentrations were measured using a conventional three-electrode configuration. Several characteristic values were selected on the polarization curves. Relations between the characteristic values and the brightener concentrations were analyzed. The polarization curve shape correlated with the concentrations of saccharin sodium salt dihydrate and 2-butyne-1,4-diol, which are commonly used brighteners for nickel plating liquids. These correlations were changed to functions when the brightener concentrations were markedly lower than the commonly used values. The brightener concentrations estimated according to the functions were compared with the prepared brightener concentrations. The estimated values showed good linearity. We concluded that this method is applicable for estimating brightener concentrations in nickel plating liquids.

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