ANTIFOULING COAT Russian patent published in 1998 - IPC

FIELD: technology of protection of underwater hulls of sea-going vessels and structures against corrosion and fouling; application of antifouling coats on underwater surfaces. SUBSTANCE: antifouling coat has subcoat applied on base and outer porous layer including copper. Subcoat is made on base of aluminium and outer later contains additionally zinc. Open porosity of outer layer is equal to 6-8% with content of copper of 20±3% and zinc, 80±3%. Precoat may include inner layer applied on base of intermediate layer made from forming-quality aluminium alloy and outer intermediate layer applied on it. Outer intermediate layer consists of forming-quality aluminium alloy, 60±3%, and zinc, 40±3%. Open porosity of outer intermediate layer may range from 4 to 6%. Ratio of thickness of inner intermediate layer, outer and intermediate layer and outer layer is as follows: (1±0.1):(2±0.2):(4: ±0.5). EFFECT: enhanced reliability. 4 cl, 1 dwg