Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Monitoring of Degradation Process of Commercial ME Tapes under High Humidity Environment by AC Impedance Techniques

  • Take, Seisho (Department of Materials Chemistry and Bioengineering, Oyama National College of Technology) ;
  • Shimanuki, Akiko (Department of Materials Chemistry and Bioengineering, Oyama National College of Technology) ;
  • Itoi, Yasuhiko (Department of Materials Chemistry and Bioengineering, Oyama National College of Technology) ;
  • Okuyama, Masaru (Department of Materials Chemistry and Bioengineering, Oyama National College of Technology)
  • Published : 2004.10.01
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Abstract

The corrosion resistance of several kind of ME (Metal Evaporated) tape has been investigated both in mild sulfuric acid solution and NaCl solution by electrochemical impedance spectroscopy. It was found that the degradation of ME tapes was accelerated with increasing the concentration of sulfuric acid. There was no significant change in corrosion resistance when the concentration of NaCl was under 3.5 wt%. However, the impedance value decreased when the concentration of NaCl was up to 10 wt%. The degradation of backside of ME tapes was also investigated by AC impedance measurements. The results showed that the impedance behavior of backside plastic film changed with the concentration of sulfuric acid even at the beginning of immersion, implying the changing of the permeability for the backside of ME tapes. It was also found that the corrosion resistance of DVC (Digital Video Cassette) ME tape was better that that of Hi-8mm ME tapes in sulfuric acid solutions. Also, the backside of DVC ME tape showed better water resistance than that of Hi8 ME tapes.

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References

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