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| GALVANOSTATIC POTENTIAL OSCILLATIONS OF MILD STEEL IN 93％ SULFURIC ACID |
| Ming Tingjiang and Xu Naixin(Shanghai Institute of Metallurgy; Chinese Academy of Sciences) |
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Abstract When a mild steel electrode in 93％ sulfuic acid was first controlled potentiostatically over 300mV(vs Pt in the same medium) and then galvanostatically at a reduced currentdensity, regular sinusoidal oscillations of potential were observed. Analysis of the experimental results indicated that the periodic phenomenon was caused by alternate active-passive transition on the electrode surface. Their amplitude and period were almost independent on the polarization potential and current. When temperature increased, the period became shorter, and the amplitude smaller. Vigorous stirring could stop the oscillations. Passiveactive alternation of weak sites of the electrode surface caused the potential oscillations.
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Received: 25 August 1992
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