PURPOSE: To impart superior liq. repellency to a metallic surface by an easy operation by previously imparting a finely rugged structure to the surface to be coated with a liq.-repellent material and making the surface hydrophilic so that the contact angle to water is regulated to a specified value or below.
CONSTITUTION: The whole or a part of a hydrophilic metallic surface having a finely rugged structure and ≤30° contact angle to water is coated with a liq.-repellent material. The height of the rugged structure is ≤300μm, preferably ≤30μm and the structure preferably has a large actual surface area of ≥3cm2 per 1cm2 of the rugged structure when seen on a level. The upper limit of the surface area is preferably <20cm2 because an excessively large surface area reduces the strength of the metallic surface. In order to effectively use the entire actual surface of the rugged structure, the contact rate of the rugged surface, that is, the contact area of the rugged structure at the time of bringing a smooth rigid body into contact with the rugged surface is preferably regulated to ≤0.2cm2 per 1cm2 of the surface of the rigid body.
ONDA TOMOHIKO
TSUJII KAORU
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