41results about How to "Meet corrosion resistance requirements" patented technology

The invention discloses corrosion resistant steel for cargo oil tanks and application thereof. The corrosion resistant steel for cargo oil tanks comprises the following chemical components in percentage by weight: 0.01-0.2% of C, 0.05-1.0% of Si, 0.1-2.0% of Mn, being more than or equal to 0.020% of P, being more than or equal to 0.020% of S, 0.1-1.5% of Cu, being more than or equal to 1.0% of Cr, 0.01-1.0% of Ni, being more than or equal to 0.1% of Al, being more than or equal to 0.010% of Ti and the balance of Fe. The corrosion resistant steel also comprises one or more than two of 0.05-1.0% of W, 0.01-0.5% of Mo, 0.05-1.0% of Co, 0.01-0.3% of Sb and 0.01-0.3% of Sn, or one or more than two of 0.01-0.5% of Nb, 0.005-0.1% of V and 0.0005-0.005% of B, or one or two rare-earth elements of being more than or equal to 0.50% of La and being more than or equal to 0.50% of Ce. The corrosion resistant steel is used in a cargo oil tank of a crude oil tanker, and has excellent general corrosion resistance and local corrosion resistance.

The invention provides a stainless steel surface processing method. The stainless steel surface processing method includes the processing steps of acid washing, alkali washing, passivation and sealing of stainless steel workpieces, wherein in the passivation and / or sealing process, ultrasonic processing is conducted on a passivation solution and a sealing solution at the same time. By means of the stainless steel surface processing method, the roughness of the surfaces of the stainless steel workpieces can be reduced, the metal glossiness is excellent, oxides or other impurities on the surfaces can be removed thoroughly, passivation films can cover the surfaces of the workpieces evenly and completely, and the corrosion resistance of stainless steel is greatly improved.

The invention relates to engineering plastic surface treatment, and particularly relates to a surface coating structure of engineering plastic and a preparation method thereof. The surface coating structure of the engineering plastic comprises, in sequence, a vacuum coating conductive metal layer, a nickel electroplated coating, a PVD corrosion-resistant alloy layer and a PVD color layer. The method includes a step of subjecting the engineering plastic to hydrocarbon vacuum oil removal and drying, transferring and hanging the engineering plastic into a PVD furnace, and subjecting the conductive metal layer to vacuum plating; a step of transferring and hanging the processed engineering plastic product to an electroplating hanger to perform nickel electroplating, performing Watt's nickel electroplating, then performing semi-bright nickel electroplating, subjecting the engineering plastic product to wiredrawing processing, and subjecting the engineering plastic product after the wiredrawing processing to hydrocarbon vacuum oil removal and drying; or a step of transferring and hanging the processed engineering plastic product to an electroplating hanger to perform nickel electroplating, performing Watt's nickel electroplating first, then performing semi-bright nickel electroplating, then performing bright nickel electroplating, and finally performing microporous nickel electroplating; and a step of plating the processed engineering plastic product with the PVD corrosion-resistant alloy layer and the PVD color layer.

The invention provides a zirconium-silver alloy target and a preparation method and an application thereof, and relates to alloy targets. The zirconium-silver alloy target is composed of 97-99.5% of zirconium and 0.5-3% of silver according to mass percent. The preparation method includes the following steps: mixing nuclear grade sponge stage metal zirconium with silver chips to obtain a zirconium and silver mixture; pressing the zirconium and silver mixture into electrodes, placing the electrodes in a nitrogen atmosphere environment to prevent dampness and oxidation of the material; welding each two electrodes into a melting electrode; melting the melting electrode to obtain primary zirconium-silver ingots; deheading and smoothing the tails of the primary zirconium-silver ingots, welding each two primary zirconium-silver ingots into a secondary zirconium-silver melting electrode; melting the secondary zirconium-silver melting electrode to obtain secondary zirconium-silver ingots; hot forging the secondary zirconium-silver ingots to eliminate coarse-grain generated in the melting process and homogenize the tissues, carrying out a heat treatment and cooling, and processing the necessary zirconium-silver alloy target according to the size specification of the target. The prepared zirconium-silver alloy target is free of such defects as obvious pore, segregation and the like, and is uniform in tissue size.

The invention discloses an acidic oil extraction medium corrosion inhibitor, which contains thiourea and hexamethylenetetramine, wherein the mass ratio of thiourea to hexamethylenetetramine is 1:4-10:1. The acidic oil extraction medium corrosion inhibitor disclosed by the invention is high in corrosion inhibition, especially applicable to the corrosion prevention of N80 steel in an acidic oil extraction medium, namely, an ammonium persulfate solution, in an oilfield, wherein the mass concentration of ammonium persulfate is 2-10% (wt.), and the corrosion temperature is set at 10-80 DEG C; the acidic oil extraction medium corrosion inhibitor is low in toxicity, and especially suitable for the occasions with high environmental requirements.

The invention provides a surface corrosion-resistant thermal insulation composite material for oil field storage equipment and a conveying pipeline. The material comprises a bottom layer, a thermal insulation middle layer and an organic corrosion-resistant surface layer, wherein the bottom layer is directly attached to the outer surfaces of the oil field storage equipment and the conveying pipeline, the thermal insulation middle layer is of a multi-layer structure, and the organic corrosion-resistant surface layer is composed of epoxy resin. A composite structure is used as a minimum unit group, multiple composite structures are repeatedly stacked to form the thermal insulation middle layer, each composite structure comprises a three-stage thermal insulation unit layer, the first-stage thermal insulation unit layer is a coarse particle silicon dioxide porous powder layer / rock wool layer, the third-stage thermal insulation unit layer is a fine particle silicon dioxide porous powder layer / rock wool layer, and the second-stage thermal insulation unit layer is a mixed-particle-size silicon dioxide porous powder layer / rock wool layer. The corrosion-resistant thermal insulation compositematerial can be used for thermal insulation on the outer surfaces of an oil-gas storage equipment and an oil-gas conveying pipeline, the effect of the material is excellent, and the construction method is simple and convenient.

The invention discloses a method for measuring and calculating sulfuric acid corrosion resisting equivalent of a steel material. The corrosion resisting equivalent is measured and calculated according to the following corrosion resisting equivalent model, wherein the corrosion resisting equivalent is described in the specification, wherein Ti, Cu, Cr, Ni, Sb, S, P, C and Mn respectively represent percent contents of corresponding elements in the steel material, and alpha, beta, gamma, delta, phi, zeta, eta, theta and mu respectively represent corrosion coefficients of corresponding elements. The method has the advantages of avoiding the problem of incapability of judging whether the corrosion resisting property of the steel material reaches the standard after the steel material is produced according to the component control range formulated by all factories, being short in detection period, lowering production cost, reducing resource and energy consumption, being capable of meeting the requirement of corrosion resistance of a tobacco oven, and achieving remarkable economic benefit and social benefit.

The invention relates to the technical field of engine tail gas detection systems, in particular to a ceramic layer for improving antifriction and corrosion resistance of the inner wall of a venturi tube and a preparation method of the ceramic layer. The ceramic layer is grown on the surface of a venturi tube substrate, and the ceramic layer is prepare from aluminum oxide and aluminum silicate andhas the thickness of 5-15 micrometers. The preparation method of the ceramic layer comprises the following processes of S1, deoiling the surface of the venturi tube substrate, S2, cleaning the venturi tube substrate, S3, growing the ceramic layer on the surface of the venturi tube substrate, S4, cleaning the venturi tube again, and S5, drying the venturi tube. The ceramic layer obtained by the novel surface treatment technology has the advantages of being high in hardness, strong in corrosion resistance, uniform in thickness, good in bonding force, resistant to high temperature, high in flameretardance and free of six harmful substances, the antifriction an corrosion resistance of the inner wall of the venturi tube can be improved, and therefre the service life of the venturi tube is greatly prolonged.

The invention discloses a cabinet door locking device for a marine electrical cabinet. The marine electrical cabinet comprises a cabinet body and a cabinet door. The marine electrical cabinet comprises a lock box, a gear, an operating handle, an upper lock rod, a lower lock rod and an operating handle control mechanism, the lock box is fixed in the middle of one side of the cabinet door far away from a longitudinal frame of the cabinet body, the gear is positioned in the lock box and fixed onto a gear shaft, the gear shaft is supported on a gear shaft seat, one end of the gear shaft facing the operating handle penetrates one side of the cabinet door backing a cabinet body cavity, the operating handle is fixed to one end of the gear shaft, the upper lock rod is matched with a pair of upper lock rod guide rails, an upper cylinder is arranged at the upper end of the upper lock rod, an upper lock rod rack is arranged at the lower end of the upper lock rod, the lower lock rod is matched with a pair of lower lock rod guide rails, a lower cylinder is arranged at the lower end of the lower lock rod and matched with a lower latch in a bolted manner, the lower latch is fixed to a lower frame of a cavity opening, a lower lock rod rack is arranged at the upper end of the lower lock rod, and the operating handle control mechanism is arranged on the cabinet door and matched with the operating handle. Anti-corrosion requirements are met, the cabinet door locking device is durable in use, reliable, good in safety and convenient to operate in a bare-handed manner, and the structure is simplified.

A continuous annealing and acid washing method for medium-chromium ultrapure ferrite stainless steel comprises the process flow of cold rolling, annealing heat treatment, acid washing, final water washing, drying, flattening and packaging, and is characterized in that in the acid washing process flow, the acid washing solution is prepared from 120-150g / L of 65% nitric acid, 2-4g / L of 40% hydrofluoric acid and water. According to the invention, in the chemical acid washing stage, reasonable concentration ratio of nitric acid to hydrofluoric acid is adopted and proper acid washing speed is controlled to carry out acid washing on medium-chromium ferrite stainless steel. As a result, on one hand, the performance of a medium-chromium ferrite stainless steel passivation film is obviously improved, and the corrosion resistance of the surface of a medium-chromium ferrite stainless steel 2B board is significantly improved, and on the other hand, the process flow of the existing production factory is not needed to be changed, a special passivation treatment procedure is not needed, and the production cost is significantly lowered.

The invention provides a hot-dip galvanized aluminum-magnesium plating solution on the surface of steel to alleviate the risk of cracks on the coating surface of steel under repeated bending conditions in the prior art. The present invention improves corrosion resistance by adding alloy element Mg. In order to suppress the risk of cracks on the surface of the steel and its coating produced by repeated bending, a certain amount of Ti and B is added to improve the corrosion resistance and at the same time precipitate an intermediate phase at the grain boundary to inhibit the generation and expansion of cracks. The final galvanized steel adopts air cooling combined with water cooling to further refine the grains, improve corrosion resistance and inhibit crack growth. The final product extends the service life of galvanized aluminum-magnesium steel.

The invention relates to phosphomolybdie heteropolyacid passivation treating liquid used for a hot galvanized plate and the preparation method thereof. The passivation treating liquid consists of 15000 to 23000 ppm of molyadate, 7300 to 11000 ppm of sodium phosphate, 2000 to 5000 ppm of nitrate radical, at least one of 5000 to 15000 ppm of water soluble high molecular compounds, at least one of 1000 to 4000 ppm of nonionic surface active agent, and the pH value of the solution is 2 to 3. The invention has the preparation method that the molyadate and the sodium phosphate are mixed, and then the nitrate radical is added; the nonionic surface active agent is added in the water soluble high molecular compound, then the water soluble high molecular compound is added into the prepared solution,the pH value is 2 to 3, and the constant volume reaches 1000 ml. The treating temperature to the hot galvanized plate is 30 to 50 DEG C, the treating time is 30 to 60 seconds, the drying temperatureis 50 to 70 DEG C, the drying time is 5 to 25 minutes. The salt atmosphere resistant ability of the treated hot galvanized plate is above 72 hours.

The invention provides a surface corrosion-resistant thermal insulation composite material for oil field storage equipment and a conveying pipeline. The material comprises a bottom layer, a thermal insulation middle layer and an organic corrosion-resistant surface layer, wherein the bottom layer is directly attached to the outer surfaces of the oil field storage equipment and the conveying pipeline, the thermal insulation middle layer is of a multi-layer structure, and the organic corrosion-resistant surface layer is composed of epoxy resin. A composite structure is used as a minimum unit group, multiple composite structures are repeatedly stacked to form the thermal insulation middle layer, each composite structure comprises a three-stage thermal insulation unit layer, the first-stage thermal insulation unit layer is a coarse particle silicon dioxide porous powder layer / rock wool layer, the third-stage thermal insulation unit layer is a fine particle silicon dioxide porous powder layer / rock wool layer, and the second-stage thermal insulation unit layer is a mixed-particle-size silicon dioxide porous powder layer / rock wool layer. The corrosion-resistant thermal insulation compositematerial can be used for thermal insulation on the outer surfaces of an oil-gas storage equipment and an oil-gas conveying pipeline, the effect of the material is excellent, and the construction method is simple and convenient.

The invention discloses a chromium-aluminum alloy target as well as a preparation method and an application thereof and relates to an intermetallic compound alloy target. The chromium-aluminum alloy target comprises the following components in percentage by weight: 50-80% of chromium and 20-50% of aluminum. The preparation method comprises the following steps: mixing chromium powder with aluminum powder to obtain a chromium-aluminum mixed material; putting the chromium-aluminum mixed material in a nitrogen protective atmosphere to be pressed to n electrodes; welding every two electrodes pressed to chromium-aluminum smelting electrodes; smelting the chromium-aluminum smelting electrodes for the first time to a chromium-aluminum first ingots; de-heading and removing tail of the chromium-aluminum first ingots, and welding every two chromium-aluminum first ingots to chromium-aluminum secondary smelting electrodes; smelting the chromium-aluminum secondary smelting electrodes for the second time to obtain chromium-aluminum secondary ingots; carrying out hot forging on the chromium-aluminum secondary ingots; thermally treating the hot-forged chromium-aluminum secondary ingot, and then air-cooling and cooling, and processing the required chromium-aluminum alloy target according to dimension of the target. The chromium-aluminum alloy target can be applied to manufacturing products in the fields of bathrooms, household appliances, automobiles and the like.

The invention relates to engineering plastic surface treatment, and particularly relates to a surface coating structure of engineering plastic and a preparation method thereof. The surface coating structure of the engineering plastic comprises, in sequence, a vacuum coating conductive metal layer, a nickel electroplated coating, a PVD corrosion-resistant alloy layer and a PVD color layer. The method includes a step of subjecting the engineering plastic to hydrocarbon vacuum oil removal and drying, transferring and hanging the engineering plastic into a PVD furnace, and subjecting the conductive metal layer to vacuum plating; a step of transferring and hanging the processed engineering plastic product to an electroplating hanger to perform nickel electroplating, performing Watt's nickel electroplating, then performing semi-bright nickel electroplating, subjecting the engineering plastic product to wiredrawing processing, and subjecting the engineering plastic product after the wiredrawing processing to hydrocarbon vacuum oil removal and drying; or a step of transferring and hanging the processed engineering plastic product to an electroplating hanger to perform nickel electroplating, performing Watt's nickel electroplating first, then performing semi-bright nickel electroplating, then performing bright nickel electroplating, and finally performing microporous nickel electroplating; and a step of plating the processed engineering plastic product with the PVD corrosion-resistant alloy layer and the PVD color layer.