METHOD FOR CORROSION-RESISTANT COVERING APPLICATION TO TITANIUM ALLOY HARDWARE Russian patent published in 2012 - IPC C23C26/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to method of applying corrosion-resistant covering to titanium alloy hardware and may be used to protect titanium alloy tubes from corrosion when the tubes are used in marine environment containing up to 20 wt % of chlorides. Hardware surface is covered with thermally unstable ruthenium salt solution Ru(OH)Cl₃ with viscosity raising additives. Thermal annealing is done, as a result of which a layer of ruthenium oxide is applied. Corrosion-resistant covering is to be applied to 100% of protected surface. The solution may additionally contain H₂IrCl₂, TiCl₃, HCl. Glycerine in ratio up to 20% of general solution amount may be used as a viscosity raising additive. Thermal annealing may be done in oxidising atmosphere at temperature of 450°C. The hardware surface is pretreated to increase roughness and wettability, particularly, bead blasting treatment is done with degreasing following it. Covering of titanium alloy hardware of any degree of complexity is provided, including covering hardware with weld seams, particularly, inner surface of tubes and double bottom tanks.

EFFECT: invention is easy to implement, can be done in any manufacturing environments without special-purpose equipment.

7 cl, 3 dwg