11 results about "Grit blasting" patented technology

Bearing having copper-based lining 3, a polymer-based overlay 5, and a chemically resistant interlayer 4. The interlayer surface 4a facing the polymer overlay may be roughened by grit blasting to 0.4

The present application relates to a kind of grit blasting thickness determination method and a kind of grit blasting parameter optimization method, grit blasting thickness determination method includes: judging the position of each grit blasting mechanism and numbering grit blasting mechanism, establish the coordinate system with the center of workpiece geometry as origin, according to the position of grit blasting mechanism, the grit blasting coverage area of each grit blasting mechanism and the area where workpiece is located are calculated, whether the area where workpiece is located and the grit blasting coverage area of grit blasting mechanism overlap is judged, grit blasting thickness is determined according to the result of judgment;Grit blasting parameter optimization method is based on the grit blasting thickness determination method described above, according to the grit blasting thickness condition of the upper surface of workpiece after each grit blasting simulation test is obtained and is adjusted accordingly.The present application can calculate the grit blasting thickness final effect of multiple grit blasting mechanisms, calculation speed is fast, precision is high, can make grit blasting more uniform.

The application discloses a preparation method of an electrolytic alkaline water nickel-based electrode and belongs to the technical fields of electrolytic hydrogen production and material surface engineering. The electrolytic alkaline water nickel-based electrode is prepared by adopting pure nickel as an outer skin of a flux-cored wire, and the inner part is wrapped with 5-20 wt.% aluminum powder and 1-5 wt.% zinc powder. The specific steps include: cleaning and grit blasting the surface of a substrate; preparing an array of welding spots on the pretreated surface of the substrate by adopting a pulsed metal-arc additive process, and the process parameters are as follows: current 100-120 A, voltage 22-23 V, argon flow rate 15 L / min, dry elongation 10-11 mm, welding speed 15-35 mm / s, and pulse frequency 10-50 Hz; and the obtained electrode sample is placed into a mixed solution of potassium hydroxide and potassium sodium tartrate for water bath heating, so that the electrolytic alkaline water nickel-based electrode is obtained. The electrolytic alkaline water nickel-based electrode has high double-layer capacitance and low hydrogen production overpotential, and has good electrocatalytic performance.

The invention relates to an anti-corrosion construction method for an offshore wind power foundation, belongs to the technical field of ocean engineering anti-corrosion, and solves the technical problem that the anti-corrosion service life of a foundation structure cannot meet the design requirement of a wind power plant due to the fact that a traditional single coating system is prone to early failure, pitting corrosion and stripping in a severe ocean environment, especially in a splash zone and a tidal range zone. The method comprises the following steps: carrying out sand blasting treatment on the outer surface of the steel structure until the cleanliness is Sa2.5 level and the roughness Ry is 60-100 microns; spraying a zinc-aluminum alloy bottom layer containing repairing microcapsules in the splash zone and the total immersion zone in an electric arc manner; coating an epoxy micaceous iron interlayer added with 0.5-1.5% of functionalized graphene oxide, wherein the thickness of the epoxy micaceous iron interlayer is 300-450 [mu] m; and finally, coating a fluorocarbon resin or polysiloxane surface layer, and scanning and curing by adopting intense pulsed light at the energy density of 5-15J / cm and the pulse width of 1-5ms. The method is mainly used for improving the long-term protection performance and prolonging the service life of the offshore wind power foundation structure in the corrosion environment.

The application discloses a kind of P20 alloy steel laser quenching surface strengthening method, comprising the following steps: S1.Preprocessing: P20 alloy steel workpiece surface is treated with alumina grit blasting, after sand blasting, surface roughness Ra=1.5~3.0 μm is made;After sand blasting, the workpiece is cleaned;S2.Laser processing: laser beam is linear uniform speed scanning along the workpiece surface obtained in step S1, laser power is 1.8~2.0 kW, and scanning speed is 4~5 mm / s;S3.Cooling: the workpiece obtained in step S2 is cooled in 20~30 ℃ air cooling.Cooling.The application is realized through sand blasting pretreatment-precision parameter-normal temperature air cooling synergic process system, and the synergic promotion of laser absorption efficiency, heating uniformity, cooling stress release, fundamentally solves the core problem of "single link optimization cannot consider effect and efficiency".

Provided is a process for blast cleaning comprising subjecting a work surface to a blast stream, wherein the work surface is metal that is contaminated with one or more radioactive moiety, wherein the blast stream comprises water and one or more resin particles.

A method of removing a coating system from a component that is coated with the coating system. The method involves: (a) immersing the component in a caustic solution; (b) maintaining the component in the caustic solution at atmospheric pressure for a time ≤1.5 hours at a temperature ≥150° C. and ≤250° C.; (c) removing the component; (d) rinsing the component in water; (e) water jet blasting the component to remove the ceramic top coat layer and any thermally-grown oxide; (f) immersing the component in an acid solution; (g) ultra-high pressure water jetting the component; (h) aluminising the component to convert any diffused Pt within the bond coat layer to Pt—Al; (i) acid stripping and grit blasting the component; (j) immersing the component in a solution of nitric acid and / or sulphamic acid; and (k) ultra-high pressure water jetting the component to remove any Pt—Al.

An unchamfered piston ring that is pre-treated by grit blasting to a defined roughness, followed by PVD coating with a metal nitride to a thickness of at least 10 μm, leaving peaks and valleys in the coated piston ring. The coated piston ring is then lapped to remove the peaks without penetrating the coating, so that valleys and plateaus remain in the coated surface. The resulting piston ring exhibits superior coating retention due to the increased surface area created by the grit blasting, and yet also superior performance, as the cavities remaining increase the porosity of the coating and thus enhance the lubrication of the ring.

An annular nozzle for online sandblasting of steel wire, belonging to the field of sandblasting technology, solves the problem of poor circumferential uniformity of sandblasting on the steel wire surface caused by the need to set multiple nozzles at different angles at the same position on the steel wire in existing technologies. It includes a nozzle outer shell, within which a nozzle inner shell is housed. The nozzle inner shell is connected to the nozzle outer shell via a nozzle upper cover plate. The steel wire hole of the nozzle upper cover plate is connected to the upper end of the steel wire-penetrating inner cavity in the middle of the nozzle inner shell. An annular sandblasting channel is formed between the sandblasting outer cavity within the nozzle outer shell and the outer wall of the nozzle inner shell. The sand inlet port on the nozzle upper cover plate is connected to the upper end of the sandblasting channel. The sandblasting outlet at the lower end of the nozzle outer shell and the lower end of the steel wire-penetrating inner cavity are respectively connected to the lower end of the sandblasting channel. Its design is reasonable and compact, ensuring circumferential uniformity of steel wire sandblasting, increasing sandblasting speed, and significantly improving sandblasting effect.

The utility model belongs to the technical field of sand blasting texturing devices, and particularly relates to a portable movable sand blasting texturing device which comprises a working box, the working box is connected with a sand blasting gun, sand blasting baffles are correspondingly arranged on the two sides of the working box, through holes are correspondingly formed in the sand blasting baffles on the two sides, the upper end of the working box is connected with a hanging rod, and the upper end of the hanging rod is connected with a base. The portable movable sand blasting texturing device comprises a lifting rod and a working box, the lifting rod is in sliding connection through a first sliding assembly, one side of the working box is in sliding connection to a supporting frame through a second sliding assembly, and stable sliding of the working box is achieved through sliding connection of the first sliding assembly and the second sliding assembly. The stable sliding of the working box is realized through the sliding connection of the first sliding assembly and the second sliding assembly, so that the working box can slide towards one side, the working space is flashed, the conflict of the working space with the spraying operation is avoided, the structure is stable, and the operation is convenient.

The invention discloses a stainless steel-carbon steel composite pipe and a manufacturing process thereof. The manufacturing process comprises the following steps: providing a carbon steel base layer pipe and a stainless steel metal belt; carrying out cleaning and sand blasting roughening treatment on the to-be-compounded surfaces of the two; the stainless steel band is curled and embedded into the base layer pipe, and a gap is reserved; the gap is subjected to spot welding sealing; after a sealing end cover is installed, high-pressure liquid is injected for hydraulic bulging, and double metal is tightly attached; and finally, solid-state diffusion bonding is carried out under the protective atmosphere to form metallurgical bonding. The composite pipe has a complete metallurgical bonding interface, a Cr, Ni and Fe element interdiffusion zone exists at the interface, the width is 10-30 [mu] m, the interface bonding strength is not lower than 280 MPa, carbides are distributed in a dispersed mode, and the average size is not larger than 4 [mu] m. The problem of brittle phase generated by a fusion casting method is avoided through an all-solid-state process, the bonding strength is far higher than that of a mechanical composite method, equipment is simple, the method is suitable for large-specification pipe production, and the contradiction between interface quality and production efficiency in the prior art is effectively solved.