Abstract
Contact angles θ of various liquids to different anodic oxide films produced in acid baths (sulfuric and oxalic acids) and alkaline baths (ammonium hydroxide and fluoride mixture, ethylenediamine and ammonium carbonate) were measured. The anodic oxide films formed in the alkaline baths are more wettable to distilled water than those formed in the acid baths, but are less wettable to oils. The films produced in the alkaline baths are hardly wet by basic organic solvents and are more easily wet by acid solvents than those produced in the acid baths. Wetting of the films to aqueous solutions dissolving gases is accelerated in accordance with gas concentration probably by a corrosive action of the dissolved gases.
