Transient Anode Phenomena

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Abstract
The method of direct‐current transients has been applied to the study of phenomena in the cell (Pt). Evidence is presented to support the view that passive iron has on its surface an adsorbed layer, which is unstable below a certain voltage known as the activation potential. Oscillations of current between passive and active states have been photographed, as well as oscillations about a “medial” state, the existence of which seems to be related to the . As a working hypothesis, it is assumed that this ion reacts in some way with the Fe++ ions to form a precipitate, the more of which can be held on the surface, the higher the voltage (in the range −0.30 to +0.10 volt with respect to the calomel cell). The medial oscillations can be interpreted in terms of the response to sudden switching of the applied voltage by a small amount. They occur for suitable values of the external resistance, the function of which is to provide continuous variation of the anode calomel voltage.

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