RussianPatents.com

Method for corrosion-resistant covering application to titanium alloy hardware. RU patent 2451771.

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

IPC classes for russian patent Method for corrosion-resistant covering application to titanium alloy hardware. RU patent 2451771. (RU 2451771):

C23C26 - Coating not provided for in groups ; C23C0002000000-C23C0024000000

Another patents in same IPC classes:

Steel tool or carbide tool treatment method / 2451108
Steel tool or carbide tool treatment method involves application of diffusion coating by saturation of steel or carbide tool in eutectic lead-lithium melt with addition of copper and nickel so that the coating is obtained. After application of coating the tool is strengthened by its being aged on material with hardness of 10 to 18 HRCe at value of contact stresses of 2000 to 5000 MPa during 2-5 minutes.

Method of surface impregnation of steel actuator cutting edge of tiller / 2447194
Method includes saturation of a cutting edge with strengthening elements from a plaster containing 84 or 90 wt % of boron carbide and 16 or 10 wt % of a fused flux for induction fusing P-0.66. The plaster is applied onto the cutting edge and the actuator's tip at the side contacting with soil, saturation is carried out with high-frequency currents with heating of the saturated surface up to the temperature of 1250-1300°C and soaking time of 1-2 min. Subsequent thermal treatment is carried out by heating of the entire tiller up to 850-900°C with subsequent tempering in the oil medium. The fused flux for induction fusing P-0.66 contains modifiers, such as a mixture of a silicocalcium powder 20 wt % and a powder of flux AN-348A 80 wt %.

Method of processing surface of article made from titanium alloy / 2445406
Proposed method comprises preliminary preparation of article surface, placing article and current conduction titanium material in processing zone, creating vacuum in said zone, feeding negative potential, separately, to article and current conducting material, firing arc on current conducting material that burns in vapors of said material to produce plasma, bombarding, cleaning and diffusing article surface and accumulating ions of current conducting material on article surface at article surface temperature below that strength loss in article material to produce coating. Two current conducting materials are arranged in processing zone, one of titanium and another one of nickel-based alloy. Accumulation and diffusion of titanium material ions are performed at negative potential at article of 120-200 V in atmosphere of inert gas consisting of the mix of oxygen and argon in (1-2):1 ratio at 0.05-0.3 MPa. Thereafter, reaction gas feed is terminated to excite vacuum arc at second nickel-based material and to accumulate its ions at negative potential of 15-20 V.

Laminar material from metal sheets and polymer / 2440246
Invention relates to laminar material made from metal sheets and polymer layer reinforced by fibers and bonded therewith, to be used in aircraft or aerospace engineering. Laminar material comprises at least one first metal layer of invariable thickness of at least 1.5 mm and at least one second of invariable thickness of at least 1.5 mm. Said first and second layers are bonded together by polymer layer reinforced by fibers, volume content of fibers not exceeding 45%. Aforesaid polymer layer comprises reinforcing fibers laid in polymer matrix and selected from the group including fiber glass, carbon fibers, drawn thermoplastic fibers, natural fibers and combinations thereof. Said fibers are impregnated by polymer matrix in partially hardened state.

Complicated profile consisiting of metal profile coated with metal foil / 2439201
Invention is referred to a complicated profile (1), consisting of a metal profile (2) coated with metal foil (3), and a method of coating application on production line by means of the metal foil (4). The method includes subsequent transportation of preliminary cut-out sections of shaped profiles (2) made from plastic or metal. The coating of each shaped profile (2) section with metal foil (3) is ensured to couple the said foil (3) with the said profile (2) in any point of surfaces of metal foil. This coating also ensures detection of the first, the lower by downstream, end (6) and/or the second, the upper by downstream, end (7) of each shaped profile (2) section and their cutting at the level of each end of each shaped profile section. The above metal foil (3) is selected so that its surface hardness could be higher than the hardness of the above shaped profile (2).

Method of surface treatment to protect it / 2439200
Substrate material is coated with a layer containing, at least, one metal for producing the applied layer on the substrate material. In order to produce metal protective layer, the applied layer is then treated thermally in recovering environment at pressure below atmospheric level.

Composition of bath for chemical-thermal treatment of friction surfaces of steel items / 2436867
Composition of bath has following ratio of components, wt %: water 38.0-40.0, caustic soda 40.0-43.0, sulphide soda 1.5-2.5, hypo-sulphurous soda 2.0-3.0, sulphurous titanium 7.0-8.0, copper sulphide 2.5-3.5, potassium 3.0-4.0.

Heat resistant component / 2436866
Heat resistant component contains main part of TiAl of inter-metallic compound having friction surface rubbing against another component and resistant to abrasion coating. Coating is applied on friction surface and is formed by sedimentation in discharge of material of a consumable electrode of metal resistant to abrasion.

Procedure for production of built-up coating on blade body of turbo-machine / 2434973
Strips of alloyed metals are built-up in direction of lengthwise generatrix of blade body ensuring gaps between built-up strips at least on part of blade body and forming layer. As built-up metal there are used alloys on base of nickel with Co, Cr, Al, Mo, W, Ti, Y or their combination. Further, a blade body is mechanically processed ensuring its specified geometry. Successive thermal treatment corresponds to thermo-cycling.

Method of applying cermet coat slurry on turbine stator inner surface / 2433208
Slurry is applied by pouring into stator inner cavity through inlet branch pipe in amount sufficient for complete immersion of guide naves in slurry. Inlet branch pipe is sealed to turn turbine stator about its axis through angle at which inlet branch pipe stays at its bottom position. Then, turbine stator is turned clockwise about axis perpendicular to its axis through angle of inclination to horizon at which slurry does not flows out of turbine stator with inlet branch pipe and guide vanes unsealed. Thereafter, turbine stator is turned about said axis counter clockwise to drain slurry. Now with slurry drained, turbine stator is rotated about its axis with turbine in horizontal position, unless slurry layer water glare disappears.

Method for coating of superabrasive with metal / 2247794
Method involves using coating forming metal powder including compound; providing thermal reduction of metal from compound by placing superabrasive particles and powder adapted for forming of coating together into inert atmosphere; heating superabrasive particles and said powder to temperature of from at least 5000C to temperature below superabrasive destruction temperature during time interval sufficient for effective deposition of metal layer onto at least one portion of surface of each superabrasive particle and providing chemical bonding between said particles and said powder; cooling said particles and said powder to temperature below temperature of reaction between superabrasive particles and powder; separating mixture for obtaining of product fraction in the form of superabrasive particles coated with metal and substantially free from coating forming powder and by-product fraction in the form of coating forming powder substantially free from superabrasive particles coated with metal. Described are superabrasive particles coated with metal by means of said method, method for manufacture of abrasive tool with the use of superabrasive particles coated with metal, abrasive tool comprising said particles, and plated product comprising constructional diamond part and equipped with metal layer chemically bonded with at least one portion of surface of said constructive part.

Method of making thin hardly soluble coats (versions) / 2250932
Proposed method includes preparation of ceramic or oxide layers on substrates; after application and drying of initial substance, gassing with wet gas-reactant is performed for conversion into respective hydroxide or complex layer. Then heat treatment is performed for forming ceramic or oxide layer. For alternative making of other chalco-genide layers at increased conversion of substance, additional gassing is performed by means of chalcogen-oxygen containing gas-reactant. Metal layers may be obtained as alternative by means of reducing gas-reactant.

Method of working surfaces of units and assemblies of thermal engines / 2253696
Method comprises supplying preliminary prepared fluid into the working zone. The fluid comprises hydrocarbon agent, preliminary disintegrated mineral powder, and catalyzer. The mineral powder is made of an activated basalt of 5 μm dispersity. The catalyzer is made of alcohols.

Method of finish anti-friction treatment / 2256725
Friction surface is degreased, dried and technological medium is applied to it by means of brush, for example. Brass rod is fitted at angle of 45-60 deg. relative to surface being treated. When rod is pressed at simultaneous switching-on of electric machine, it forms shocks over surface being treated; energy of shock is equal to 0.5-0.7 J.

Method of friction brassing of friction surfaces / 2258096
Proposed method includes degreasing, application of technological fluid and friction brassing. Prior to friction brassing, friction surfaces are subjected to abrasive jet treatment at total rate of abrasive flow of 0.06 to 0.07 g/mm2. As a result, obtaining of copper-containing film on friction surfaces is guaranteed at Ra≤0.04 mcm.

Method of application of coating by surface welding of solder on structural steel surface / 2260503
Invention can be used for application of wear resistant coating onto working surfaces of cutting tools, for instance, abrasive coating into surface of milling cutter. Surface to be treated is milled and degreased with organic solvent. Prior to application of solder, flux is applied in layers. Used as flux is saturated water solution of mixture of boric acid, 30%, and sodium tetraborate, 70%. In process of application, flux is head to 300-350°C to completely evaporate water and form solid layer of flux on surface of steel and subsequent porous layer of flux. Solder is applied to flux coated surface of steel with simultaneous delivery of flux of preliminarily dehydrate mixture of boric acid, 30% and sodium tetraborate, 70%, to zone of welding with provision of filling of pores in coating with molten flux. Coating is composite material containing metal solder, particles of hard alloy and glass solder. Glass solder, as viscous component, restrains grows and development of cracks formed in operation of cutting tool.

Thread cutting tools strengthening method with use of electric spark alloying / 2264895
Method comprises steps of applying wear resistant coating onto cutting surface of tool with use of electric spark alloying process; placing tool in special fitting such as master-templates and radiators made of high temperature-conducting materials; applying coating on the whole length of front cutting surface in the form of stripe with width H = (2.0 - 2.5)h from line of thread profile apexes (h - height of thread profile) and with thickness of layer 35 - 70 micrometers while providing increased heat sink from apexes of threaded cutting profiles. Special fitting is made of copper.

Method of passivation of contact surface of refractory reservoir made from mullite and slip used for realization of this method / 2266880
Proposed method includes application of slip on contact surface; slip contains 50-70 mass-% of aluminum oxide powder Al2O3 and 30-50 mass-% of binder which contains 50-60 mass-% of aluminum chloride AlCl3 dissolved in 40-50 mass-% of water. Then reservoir is dried and roasted in oxidizing atmosphere at temperature of 1450-15500°C for at least 20 min. In some cases, use is made of slip containing water-soluble organic dye. Used as organic dye is methylene blue at total content of 0.1-0.5 mass-%. Specification gives description of slip used for passivation of contact surface of refractory reservoir. Proposed method makes it possible to form absolutely inert coat on contact surfaces of ceramic reservoirs relative to alloys of titanium coat.

Compound for forming layer on friction metal surfaces / 2266979
Proposed method includes forming of layer possessing self-restoration effect in the course of operation, high tribotechnical characteristics, enhanced wear resistance and corrosion resistance in compound containing finely-dispersed base in form of mixture and catalyst; used as finely-dispersed base are natural nickel-iron-magnesian hydrosilicates and used as catalyst is mineral of olivine group: forsterite or fatalite at the following ratio of components, mass-%: nickel-iron-magnesian hydrosilicates, 90-95; catalyst, 5-10; size of grains of base and catalyst are similar, they range from 1 mcm to 100 mcm.

Method for improving wear resistance of worn parts of steel and cast iron and for restoring such parts / 2271913
Method is realized by applying at least one coating by means of electric spark alloying. Wear resistance coating is applied with use of electrode of boron alloyed intermetallide Ni3Al containing, mass %: Al, 2 - 15; B, 0.02 - 02; Ni, the balance. In variants of invention electrode contains in addition dispersed particles of Si3 N4. Before applying on part layer of wear resistant coating, nickel layer with thickness 20 - 50 micrometers is applied as intermediate adhesion barrier. Coated parts are subjected to mechanical working. Restoration is realized for parts with wear degree up to 100 micrometers or with wear degree 100 - 300 micrometers.