| Abstrakt: |
1.The passivation of indium in nonactivating solutions (citric acid, alkali, dilute HClO4 solutions) and, under certain conditions, in activating solutions is due to adsorbed passivating films with a thickness corresponding to a single monolayer.2.Anodic curves, recorded by a potentiostatic method on indium in solutions of citric, perchloric, and hydrochloric acids, have confirmed the activating action of Cl- and ClO4-; this activating action increases with increase in the anion concentration. The effect is apparently related to the displacement of adsorbed oxygen from the indium surface by these anions.3.The cathodic activation curves recorded on passive indium show no arrests; a linear displacement of potential to more negative values takes place, probably as a result of gradual reduction of the adsorbed oxygen (the nonuniformity of the indium surface). |
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