Abstract
This paper deals with oxidation phenomena observed on surfacessubmitted to the action of corona-activated ambient air. The study wasmainly performed with gold and silicon surfaces chosen for their greatmaterial stability. During the discharge, the surfaces become covered withmicronic water droplets which look like granules. They grow in number withthe duration of the sample exposure to the discharge, their mean sizedepending on the material, and they resist the vacuum of the electronscanning microscope, but not its electron beam, especially when it isfocused on them. From a chemical point of view, the surfaces are nowoxidized in a way comparable with what can be obtained in liquidelectrochemical solutions and, apart from the electrode material oxides orhydroxides observed, one can also find nitrogen oxides, but in clearlysmaller quantities.
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