Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Volume 58 , Issue 2
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Commentary
Review
Research Paper
  • Lisa Aoki, Keishin Osaka, Masataka Omoda, Jun’ichi Sakai, Yuichi ...
    2009 Volume 58 Issue 2 Pages 56-63
    Published: 2009
    Released: September 05, 2009
    JOURNALS FREE ACCESS
    Quartz Crystal Microbalance (QCM) technique was employed to continuously detect extremely small mass changes during corrosion of silver by sulfur vapor originated from sulfur flower as a function of temperature, RH and distance from sulfur to the silver surface. Corrosion progressed linearly with exposure time during all the tests. The corrosion rate increased as temperature rose, while no significant dependence on RH was observed. Furthermore the corrosion rate decreased markedly with increasing distance. This suggests that diffusion of sulfur vapor to the silver controls initial sulfide formation of silver.
    These results have led us to propose a simple corrosion test using sulfur vapor to simulate corrosion of silver during indoor exposure of electronic equipment. The test employs the two distinct characteristics of sulfur vapor test using sulfur flower. Firstly the vapor pressure of sulfur by sulfur flower varies widely with temperature resulting a wide range of sulfur concentration. Secondly the corrosion rate of silver in sulfur vapor can be controlled by varying the distance between the sulfur flower and the silver surface.
    Since the corrosion by sulfur vapor follows the linear kinetics similar to those found in practice as well as to provide identical major corrosion chemistry and morphology of the corrosion product, silver sulfide as in practice, we propose it to provide a reasonably reproducible, more flexible test which is much easier to handle in the laboratory than flowing multi-component gas mixtures containing hydrogen sulfide.
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  • Hironobu Nuriya, Mitsugu Shima, Kazuo Ishikawa, Tsuguo Suzuki, Yoshiha ...
    2009 Volume 58 Issue 2 Pages 64-70
    Published: 2009
    Released: September 05, 2009
    JOURNALS FREE ACCESS
    The corrosion resistance of the composite coatings of thermal sprayed Zn, Zn-Al alloys and Al, with a simplified painting of the polyurethane resin, exposed to the atmosphere for 12 years in Sapporo and Tokyo was evaluated by the electric insulation test, the SEM observation and the EPMA. In spite of losing the electric insulation already, the simplified painting showed an excellent resistivity comparing to a conventional multi-layer painting. The diffusion of the iron through the sprayed Zn was larger than that through the sprayed Al, while the amounts of chloride and sulfur penetrating through the painting on the sprayed Al was larger than those on the sprayed Zn. This suggests that the thermal sprayed Zn layer has a tendency of the cation selective permeability. The protection at the scratched portion on the composite film seemed to be obtained by the cathodic protection in Zn, and the plug effect with the oxide in Al. Corrosivity of the atmosphere caused by chloride and sulfur was larger at Sapporo than at Tokyo. The fact suggests that the influence of the airborne salinity and the pollution substances is severe at the coast of Japan Sea, especially in a long period of the snow falling season.
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