| Project/Area Number |
63470052
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | Hokkaido University |
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Principal Investigator |
SEO Masahiro Fac. of Eng., Hokkaido Univ. Assoc. Prof., 工学部, 助教授 (20002016)
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| Co-Investigator(Kenkyū-buntansha) |
AZUMI Kazuhisa Fac. of Eng., Hokkaido Univ., Asistant, 工学部, 助手 (60175875)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1988: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Quartz Oscillator / Quartz Crystal Microbalance / In-Situ Gravimetry / Minute Corrosion / Thin Film Corrosion |
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| Research Abstract |
1. In-Situ Gravimetry of Atmospheric Corrosion of Metal Thin Film in Air: The system in which the weight change due to atmospheric corrosion of metal thin film in air was capable of monitoring automatically from the change in resonance frequency of quartz oscillator and the atmospheric corrosion-accelerated test apparatus in which the relative humidity and the concentration of pollutant gas in air were capable of controlling at constant temperature were constructed for this research. The corrosion behaviors of copper thin film in air containing 20 ppm of SO_2 or H_2S at 30C were monitored as a function of relative humidity in air from the change in resonance frequency of quartz oscillator. The presence of H_2S rather than SO_2 gave the more severe corrosion environment for copper thin film. The corrosion rate increased rapidly with increasing the relative humidity and oxygen in air promoted the corrosion rate.
It is made clear that the atmospheric corrosion of copper thin film proceeds with an electrochemical mechanism operative in a water film with several monolayers formed on the copper surface.
2. In-Situ Gravimetry of Minute Corrosion of Metal thin Film in Aqueous solution: The specially designed oscillating circuit was constructed to stabilize the oscillation of quartz in aqueous solution. The anodic oxidation of copper thin film in pH 8.4 borate solution was investigated by simultaneous measurements of change in resonance frequency of quartz oscillator and time-variation of anodic current. The separation of the dissolution rate of copper ions through the anodic oxide film and the uptake rate of oxygen ions into the film during the film growth was made from the comparison of the in-situ gravimetrical and electrochemical data. The anodic oxidation mechanism of copper thin film was revealed in detail from the relation between the separated two rate components.
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