Effect of hydrogen on the impedance of passivating oxide films formed on aluminium in sodium nitrate solution |
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Authors: | Seong-Min Lee Su Il Pyun |
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Affiliation: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Cheongyangni, PO Box 150, Seoul, Korea |
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Abstract: | A.c. impedance has been determined at room temperature on hydrogen-free and hydrogen-charged passivating oxide films on aluminium in 0.05m Na2SO4 solution. Analysis of the impedance data enabled a clear distinction between the capacitance and inductance of the hydrogen-free oxide film and those of the hydrogen-charged oxide film to be made. The changes in capacitance and inductance by hydrogen-charging into the oxide films are discussed in relation to the compositional change from -Al2O3 to hydrated alumina. |
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