42results about How to "Meet the requirements of corrosion resistance" patented technology

The invention discloses a high-toughness electrogas vertical welding flux-cored wire matched with corrosion-resistant COT steel and a preparation method thereof. The high-toughness electrogas vertical welding flux-cored wire comprises a low-carbon steel sheath and a flux core wrapped in the low-carbon steel sheath, wherein the flux core is prepared from the following components: 0.32-0.33 weight part of copper powder, 0.06-0.07 weight part of tungsten powder, 0.07 weight part of antimony powder, 0.58-0.6 weight part of calcium fluoride, 0.55-0.85 weight part of sodium carbonate, 0.4 weight part of potassium carbonate, 0.08 weight part of aluminum powder, 1.3-1.7 weight parts of electrolytic manganese, 0.3-0.4 weight part of silicon iron, 0.55-0.7 weight part of nickel powder and 18-19 weight parts of iron powder. Compared with the prior art, through the organic preparation of the components of the flux core and the matching of the flux core and the low-carbon steel sheath, the electrogas vertical welding flux-cored wire has good corrosion resistance, a good welding process property and good physical and chemical properties.

The invention discloses a substitutive treatment agent for metal surface phosphating and a preparation method thereof, and relates to the metal surface treatment technology. The substitutive treatment agent for phosphating consists of the following components of: gamma-APS, anhydrous alcohol, fluozirconate and de-ionized water, wherein the substitutive treatment agent for phosphating consisting of the components is a silane and nanoceramic composite film; the preparation method for the silane and nanoceramic composite film which consists of the components and is used for pre-treating the metal surface comprises the following steps of: rinsing with hot water; degreasing in advance; rinsing for the first time; rinsing for the second time; rinsing for the third time; performing phosphate-free conversion; rinsing a straight bar; rinsing for the fourth time; rinsing for the fifth time; and finishing the preparation. The substitutive treatment agent and the preparation method have the advantages that: the silane and nanoceramic composite film does not rust in 48 hours after being formed on the metal surface of a cold rolled steel sheet and the like and naturally cooled so as to meet the requirement on corrosion resistance in the production process; and meanwhile, the composite silane film has high bonding force with polyester coating layers, the cross-cut test for the adhesion reaches the first grade, the comprehensive impact resistance reaches 50cm / kg, the bending resistance is less than 1mm, and the salt spray test is more than or equal to 500 hours.

The invention relates to an environment-friendly aluminum alloy fast electroless nickel-phosphorus additive, which is composed of four components A, B, C and D, component A: 20-60mg / L yttrium oxide, 20-60mg / L ytterbium oxide, 100-500mg / L sodium tetraborate, 20-40ml / L 1:1 dilute sulfuric acid and the remaining water; B component: complexing agent and the remaining water; C component: 1-4mg / L copper sulfate, 0.5-2mg / L antimony potassium tartrate, 1-5mg / L ammonium molybdate, 4-10mg / L allyl iodide and the water of the remainder; D component: intermediate and the water of the remainder, the additive of the present invention makes Nickel-phosphorus rapid and stable deposition, the coating thickness reaches 5.6-6.0μm within 10 minutes of plating, the thickness can reach 24.3-25.0μm after continuous plating for 1 hour, the average plating speed exceeds 24.3μm / h, the coating is amorphous, uniform and dense , high hardness, excellent corrosion resistance.

The invention belongs to the technical field of metal surface treatment and specifically relates to a compound passivating fluid for a mechanical zinc coating. The compound passivating fluid comprises a component A and a component B, wherein the component A is waterborne polyurethane, of which the weight percent is 8-18% in the compound passivating fluid; the component B is an inorganic passivator, of which the weight percent is 2.4-1.5% in the compound passivating fluid; and the balance is deionized water. The pH value of the compound passivating fluid is adjusted to 6-9 by using the sulfuric acid with the mass fraction of 98%. The compound passivating fluid has a better passivating function to a mechanical zinc coating workpiece; the environmental pollution caused by hexavalent chromium is avoided; a formed film is bright and transparent, is durable and excellent in flexibility, has a certain mechanical property, is excellent in water and chemical solvent resistance and is long in salt mist resisting time. The coating has the advantages of self-repairing function, high stability, low cost, simple preparation process and simple use method.

The invention relates to an anti-hydrogen embrittlement, high-strength and tough stainless steel rod used for fasteners and a manufacturing method thereof, which belongs to the technical field of metal materials and solves the problem of anti-hydrogen embrittlement, high-strength stainless steel rods used in aerospace environments. The toughness and tight matching are not high. A hydrogen embrittlement-resistant, high-strength and tough stainless steel bar used for fasteners, the mass fraction of each element in the stainless steel bar is C: 0.0001-0.01%, Si: 0-0.10%, Mn: 0.01-0.15%, S: 0~0.005%, P: 0~0.015%, Cr: 10.50%~12.50%, Ni: 10.70%~11.50%, Mo: 0.75%~1.25%, Ti: 1.20%~1.70%, Al: 0~0.10% , H≤1.5ppm, the rest is iron and unavoidable impurities. A stainless steel bar with comprehensive properties of high strength, high toughness and hydrogen embrittlement resistance is prepared, which meets the requirements for fasteners used in aerospace environments exposed to corrosive media.

The invention relates to a nonphosphorus metal surface treatment agent and a use method of the nonphosphorus metal surface treatment agent. The nonphosphorus metal surface treatment agent consists of the following ingredients in part by weight: 5 to 20 parts of nanometer zirconium dioxide dispersing liquid with the concentration being 28 percent, 6 to 30 parts of hydrofluoric acid, 3 to 15 parts of propylene glycol, 6 to 20 parts of octavinyl polyhedral oligomeric silsesquioxane, 3 to 20 parts of acetic acid, 0.03 to 0.5 part of rare earth cerium salt, 1 to 5 parts of sodium hydroxide and 50 to 76 parts of deionized water. The nonphosphorus metal surface treatment agent has the advantages that a nanometer silane inorganic conversion film can be formed on the metal surface after the treatment on the metal. The nonphosphorus metal surface treatment agent belongs to a replacing product of the traditional phosphorizing liquid, no phosphor and no heavy metal are contained, the nonphosphorus metal surface treatment agent can work at room temperature and can be used for surface pre-treatment of various metals, the rusting phenomenon cannot be generated in 48 hours after the nanometer silane inorganic conversion film is formed on the metal surfaces of cold rolled steel plates and the like, and is then blown to be dry, and the requirement of corrosion resistance performance in the production work procedures is met.

The invention provides a method for preparing a zirconium-selenium composite conversion film on the surface of aluminum alloy. The method is mainly characterized by comprising the steps of preparing film formation liquid, wherein each liter of film formation liquid is composed of 0.1-5 g of zirconate, 0.1-10 g of selenium type oxide or selenate, 0.1-15 g of organic acid, 0.1-10 g of auxiliary oxidizing agents, 0.1-15 g of film formation accelerants and the balance deionized water; carrying out degreasing treatment and activating treatment on the pre-ground aluminum alloy, placing the aluminum alloy into the film formation liquid with the temperature ranging from 10 DEG C to 60 DEG C for conversion treatment for 5-30 minutes, then taking out the aluminum alloy, washing the aluminum alloy through distilled water, air-drying the aluminum alloy and finally obtaining the zirconium-selenium colorful composite conversion film on the surface of aluminum alloy. The method has the advantages that the operation is simple, the cost is low, the composite conversion film high in uniformity and excellent in compactness can be formed, the corrosion resistance of the aluminum alloy is improved, the environmental friendliness is high, and production is easy.

The invention relates to a manufacture method of alkaline soil corrosion-resistant steel for a hot-rolled U-shaped steel sheet pile. The manufacture method comprises the steps of: smelting in a converter and refining; controlling the chemical composition and the weight percentage of the molten steel after refining as follows: 0.15-0.26% of C, 0.8-1.4% of Mn, 0.10-0.6% of Si, less than or equal to 0.020% of S, less than or equal to 0.02% of P, 0.2-0.5% of Cu, 0.1-0,25% of Ni, and the balance Fe and unavoidable impurities; controlling the alkalinity R of final slag to be at 2-5; continually casting; controlling the depth that a long water opening is inserted into a crystallizer to be at 100-300mm; heating a continually-cast blank at 1050-1150 DEG C; and rolling, wherein the rolling temperature is 1020-1100 DEG C, and the rolling is performed under the melting point temperature of the copper less than 1083 DEG C. The alkaline soil corrosion-resistant steel can not generate the phenomena of steel water overturning and slag entrapment when being cast, has good alkaline soil corrosion resistance, and meets the requirement of the corrosion resistance of the hot-rolled steel sheet pile when being used in the alkaline soil.

The invention discloses a bimetallic wear-resisting seamless composite steel tube. The bimetallic wear-resisting seamless composite steel tube is characterized by comprising an inner steel tube and an outer steel tube which is metallurgically bonded on the inner steel tube, wherein the outer steel tube is made of a 304 stainless steel material, and the inner steel tube is made of a 9Cr18MoVNb material. The bimetallic wear-resisting seamless composite steel tube is simple in structure and low in cost, and also can satisfy the requirement on corrosion resistance and wear resistance, thereby being suitable for popularization and application.

The invention discloses a hole-sealing agent for a chemical nickel plating layer and a hole-sealing treatment process thereof. The hole-sealing agent is prepared from the following materials in percentage by volume: 90-98% of acrylic acid, 1-9% of silane coupling agent and 1-9% of water. The hole-sealing treatment process of the hole-sealing agent for a chemical nickel plating layer comprises thefollowing steps: soaking or spraying the hole-sealing agent onto the chemical nickel plating layer to enable the hole-sealing agent to be uniformly distributed on the surface of the chemical nickel plating layer; selecting water of 70-90 DEG C to carry out appropriate heating treatment on the chemical nickel plating layer, wherein the heating treatment time is 1-5 minutes; and selecting water of 30-45 DEG C to rinse the chemical nickel plating layer, and then carrying out blow-drying. After the hole-sealing treatment of the hole-sealing agent for a chemical nickel plating layer, a well combined organic film can be formed on the surface of the chemical nickel plating layer, so that the porosity of the chemical nickel plating layer is remarkably reduced, the corrosion resistance is obviously enhanced, and the conductivity and appearance of the chemical nickel plating layer are not affected.