METHOD OF COMPLEX PROTECTION OF UNDERWATER SURFACES OF WATER CRAFT AND WATER-DEVELOPMENT WORKS Russian patent published in 2003 - IPC

FIELD: protection of ship s bottoms and underwater portion of water-development works against biological mass and corrosion protection. SUBSTANCE: proposed method includes successive application of anti-corrosive coat, paint and varnish and film-forming compound on base of high-molecular fluorine-containing organic acid to metal surface. Perfluoro polyoxyalkylene carboxylic acid or perfluoro polyoxyalkylene-sulfo acid, as well as their derivatives or mixtures may be used for the purpose. It is good practice to use rust modifier as anticorrosive coat for carbon steel. Compound containing carbon tetrafluoride surfactant may be used as anti-corrosive coat for aluminum. EFFECT: inhibition of corrosion; increased speed of ships at reduced consumption of fuel. 3 cl