Abstract
The corrosion of a Pt anode has been studied in H 2SO 4 aqueous solution by measuring the weight loss. The weight loss increased linearly with time in the initial period of the corrosion at a fixed current density. The corrosion rate increased with increasing concentration of H 2SO 4 up to 1 M ( M = mol/dm 3) at 40 ° C. The corrosion rate of the Pt anode also increased with increasing current density and temperature. At 40 ° C. the corrosion rate was proportional to the first order of the current density and its value was ca. 5 μg A −1 h −1. The corrosion of Pt was retarded by the formation of oxide layers under galvanostatic electrolysis. However, when the oxides were formed and reduced repeatedly by cyclic potential sweeps, an accelerated corrosion took place.
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