35results about How to "Decreased corrosion resistance" patented technology

A plurality of steel plates including at least one first non-coated steel plate (W1) and at least one metal-coated steel plate (W2) are prepared. The plurality of steel plates are overlaid in such a fashion that at least one of the two steel plates located on the respective sides in the overlaying direction is the first non-coated steel plate. A rotary tool (7) is rotated and allowed to press a to-be-joined part of the plurality of overlaid steel plates from the first non-coated steel plate side to friction-spot-join the to-be-joined part in a solid state by causing plastic flow at the to-be-joined part by generated frictional heat. Whereby, both elongation of time required for joining and lowering of the corrosion resistance of the metal-coated steel plate are suppressed. Whereby, both elongation of time required for joining and lowering of the corrosion resistance of the metal-coated steel plate are suppressed.

The invention discloses a non-chrome purified liquid. Components of each 1000kg of the non-chrome purified liquid include: 400-900kg of deionized water, 100-500kg of low molecular weight alcohol, 50-200kg of zirconium-fluoride-acid (salt) type sedimentary inorganic film-forming agent, 10-100kg of organic-acid type metal activator, 100-300kg of silane hydrolyzate and 5-20kg of high-temperature-resistant inorganic antioxidant. The non-chrome purified liquid is good in corrosion resistance, has good high-temperature and xanthochroia resisting features since the high-temperature-resistant inorganic antioxidant is added in without organic aqueous resin, is adaptable to surface passivation processing of galvanized and aluminum-zinc alloy plated type metal products, and is further adaptable to surface passivation processing of galvanized plates (the galvanized plates for computer cases and the like) with special requirements for high-temperature and xanthochroia resisting features.

The invention discloses a water-based polyurethane anti-glare coating material and a preparation method thereof. The preparation method mainly comprises the following steps: first stage: by using polyoxytetramethylene glycol and dihydroxymethyl eicosanoic acid as raw materials, adding an organic metallic catalyst and diisocyanate to react, and adding a tertiary amine neutralizer to generate an isocyanate-terminated water-based polyurethane prepolymer; and second stage: two-step chain extension and emulsification: simultaneously carrying out emulsification and chain extension reaction on the prepolymer in a sulfonate-chain-extender-containing water solution under high-speed shearing actions until the prepolymer can be uniformly emulsified in water, and dropwisely adding a hydrazine chain extender to obtain the water-based polyurethane anti-glare emulsion. The coated film of the polyurethane anti-glare emulsion has the characteristics of low glossiness and high light transmittance, and is applicable to the fields of architectural lighting, road traffic, display screens, textile leather and the like.

The invention provides an ultralow-carbon magnesia carbon brick for the bottom of a stainless steel ladle, and a preparation method thereof. The ultralow-carbon magnesia carbon brick for the bottom ofthe stainless steel ladle is prepared from, by mass, 50 to 120 parts of fused magnesite, 0.5 to 5 parts of graphite, 1 to 5 parts of liquid phenolic resin, 0.5 to 5 parts of carbon-containing resin powder, 0.1 to 5 parts of carbon black, 0.5 to 5 parts of MgO-Al2O3-ZrO2 composite powder, 0.5 to 8 parts of metal aluminum powder and 0 to 1 part of boron carbide. The ultralow-carbon magnesia carbonbrick for the bottom of the stainless steel ladle has very strong thermal shock stability and molten steel scouring resistance; the ultralow-carbon magnesia carbon brick does not recarburize molten steel; the heat conductivity is low, and the heat loss is reduced; CO2 emission is low, and environmental friendliness is achieved; and the use of natural resources is reduced in the production process.

The invention relates to a sliding nozzle brick for high-oxygen steel and calcium-treated steel. The refractory material consists of 90-100% of one or both of the refractory materials of magnesia and aluminum-magnesium spinel in terms of weight percentage , and the balance is a refractory material of zirconia or titania. The sliding nozzle brick provided by the invention is a refractory material containing more than 90% of magnesia and aluminum-magnesium spinel, which has good mechanical properties at high temperature, high chemical stability, corrosion resistance, and strong resistance to molten metal and oxidation , for high-oxygen steel and calcium-treated steel, the sliding nozzle brick has a long life, and has the advantages of light weight and low price.

The invention discloses a corrosion-resistant and anti-rust paint and a preparation method thereof, belonging to the field of paints. In the present invention, the anti-rust active material is added into the curing agent according to the mass ratio of 2~5:10~20, stirred and mixed at 50~60°C to obtain the mixed matrix, calculated in parts by mass, taking 200~300 parts of the mixed matrix, 30 ~50 parts of preservative additives, 5~10 parts of titanium dioxide, 2~7 parts of talc, 8~15 parts of lecithin, 8~13 parts of hydrogenated castor oil, 7~12 parts of glass flakes, 3~6 parts of γ‑ Aminopropyltriethoxysilane, 80~150 parts of water, stirred and mixed at 60~70°C for 40~50min to obtain corrosion-resistant and antirust paint. The invention solves the problems of poor adhesion and poor corrosion resistance of existing antirust paints.

The invention discloses a nanometer composite ocean anticorrosion coating and a preparation method thereof, belonging to the field ofcorrosion prevention of coatings. The coating contains the following components in percentage by weight: a component A: 20%-40% of acrylic resin, 5%-10% of a hydroxyl epoxy phosphate dispersing agent, 4%-7% of a Fe3O4@TiO2-h-BN hybridized composite material, 0.5%-2%of nano-crystalline cellulose, 5%-15% of epoxy resin, 1.2%-3.5% of other aids, 20%-25% of deionized water, 5%-10% of zinc powder and 3%-7% of calcium carbonate; and a component B: a curing agent, namely 15%-25% of a water-based isocyanate curing agent. The coating prepared by virtue of the preparation method has good wear resistance, fouling resistance and corrosion resistance, is mainly applied to the fouling prevention and corrosion prevention of petroleum steel-frame structure platforms in an ocean atmospheric region environment and is also suitable for the fields of fouling prevention andcorrosion prevention of ships and underwater pipelines.

The invention provides a method for determining crystallization of an amorphous alloy. The method comprises the following steps: preparing at least four round amorphous alloy bars with different diameters by using a casting method and preparing at least two sample strips by using a die-casting method; then determining the Vickers hardness and bending strength of above amorphous alloys, analyzing the bending strength of the amorphous alloys and ranking the amorphous alloys according to a sequence of from higher bending strength to lower bending strength; if the bending strength of a certain amorphous alloy is less than 70% of the bending strength of adjacent amorphous alloys, setting the mean value of the Vickers hardness of the amorphous alloy and the Vickers hardness of the adjacent amorphous alloys as reference critical Vickers hardness for a crystalline alloy; and determining to-be-determined alloys with Vickers hardness greater than the reference critical Vickers hardness as amorphous alloys and determining to-be-determined alloys with Vickers hardness less than the reference critical Vickers hardness as crystalline alloys. The determination method provided by the invention is convenient to operate, fast in detection speed and low in cost; and the method is a nondestructive testing method and especially applicable to quality monitoring of workshop production.

The invention discloses a chromium-free passivating solution for the surface treatment of electro-galvanized steel plates, as well as a method for using the same. The mass percentages of the composition of the chromium-free passivating solution are: 0.2-20 percent of gamma-glycidyl ether oxygen propyl trimethoxy silane, 0.01-1.0 percent of polyvinyl alcohol, 0.1-3.0 percent of ammonium zirconium carbonate, water as a solvent, and the balance. The application method comprises the following steps that: the surface of a clean electro-galvanized steel plate is coated with the passivating solution,and then the passivating solution is baked to become a film; the thickness of a film layer is between 0.2 and 2.0 g / m<2>. The process treatment of the invention remarkably improves the corrosion resistance of the electro-galvanized steel plate, which is equivalent to chromate color passivation. In addition, through the treatment of the process, the coating performance of the electro-galvanized steel plate is remarkably improved as well.

The invention discloses a method for preparing a black super-hydrophobic film layer by micro-arc oxidation of magnesium alloy. First, a coloring salt solution containing copper pyrophosphate and potassium sodium tartrate is mixed with a basic electrolyte containing silicate as the main salt, and a magnesium alloy In order to immerse the substrate in the electrolyte, a black ceramic film was prepared on the surface of the magnesium alloy by micro-arc oxidation; secondly, the black ceramic film was immersed in aluminum nitrate nonahydrate solution for LDH treatment; finally, it was immersed in lauric acid ethanol solution for modification and drying. That is, a black super-hydrophobic film layer of magnesium alloy micro-arc oxidation is obtained. The invention combines the micro-arc oxidation black ceramic film with the super-hydrophobicity to prepare the functionalized film layer, which not only significantly improves the corrosion resistance of the magnesium alloy, but also has the properties of high light absorption rate, self-cleaning, anti-fouling and the like, and broadens the scope of the magnesium alloy. And the application field of micro-arc oxidation technology.

A plurality of steel plates including at least one first non-coated steel plate (W1) and at least one metal-coated steel plate (W2) are prepared. The plurality of steel plates are overlaid in such a fashion that at least one of the two steel plates located on the respective sides in the overlaying direction is the first non-coated steel plate. A rotary tool (7) is rotated and allowed to press a to-be-joined part of the plurality of overlaid steel plates from the first non-coated steel plate side to friction-spot-join the to-be-joined part in a solid state by causing plastic flow at the to-be-joined part by generated frictional heat. Whereby, both elongation of time required for joining and lowering of the corrosion resistance of the metal-coated steel plate are suppressed. Whereby, both elongation of time required for joining and lowering of the corrosion resistance of the metal-coated steel plate are suppressed.