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76results about How to "Excellent corrosion resistance" patented technology

High-nitrogen austenitic stainless steel

This invention provides a high-nitrogen austenitic stainless steel superior to the conventional one both in the corrosion resistance and strength, despite a low Ni content, characterized in having a Fe content of 50% by mass or more; containing Cr: 15.0% by mass to 35.0% by mass, Mo: 0.05% by mass to 8.0% by mass %, Mn: 0.2% by mass to 10.0% by mass, Cu: 0.01% by mass to 4.0% by mass and N: 0.8% by mass to 1.5% by mass, both ends inclusive, having a C content of 0.20% by mass or less, a Si content of 2.0% by mass or less, a P content of 0.03% by mass or less, a S content of 0.05% by mass or less, a Ni content of 0.5% by mass or less, an Al content of 0.03% by mass or less, and an 0 content of 0.020% by mass or less; wherein the contents of Cr, Mo, N and Mn are adjusted so that a compositional parameter η expressed by the equation:
η≡(WCr+3.3WMo+16WN)/WMn
    • where WCr is Cr content (% by mass), WMo is Mo content (% by mass) WN is N content (% by mass) and WMn is Mn content (% by mass) has a value of 5 or above. and optionally further containing either one of, or both of: W: 0.01% by mass to 1.0% by mass; and Co: 0.01% by mass to 5.0% by mass, both ends inclusive; and optionally further containing at least one of: Ti: 0.01% by mass to 0.5% by mass; Nb: 0.01% by mass to 0.5% by mass; V: 0.01% by mass to 1.0% by mass; and Ta: 0.01% by mass to 0.5% by mass, both ends inclusive; and optionally further containing at least one of: B: 0.001% by mass to 0.01% by mass; Zr: 0.01% by mass to 0.50% by mass; Ca: 0.001% by mass to 0.01% by mass; and Mg: 0.001% by mass to 0.01% by mass, both ends inclusive; and optionally further containing either one of, or both of: Te: 0.005% by mass to 0.05% by mass; and Se: 0.01% by mass to 0.20% by mass, both ends inclusive.
Owner:DAIDO STEEL CO LTD

High-toughness and corrosion-resistant aluminum alloy profile for aerospace and preparation method thereof

The invention relates to a high-toughness and corrosion-resistant aluminum alloy profile for aerospace and a preparation method thereof. The problem that an existing aluminum alloy profile can not meet the use requirements of aerospace is solved. The aluminum alloy profile is made from smelting raw materials including Cu, Mg, Zn, Zr and Al, and the aluminum alloy profile made from an aluminum ingot, cathode copper, a primary magnesium ingot, a zinc ingot and an aluminum zirconium alloy ingot by smelting, casting, homogenizing annealing, hot extrusion, quenching, drawing and aging. According tothe high-toughness and corrosion-resistant aluminum alloy profile for the aerospace and the preparation method thereof, by optimizing of alloy composition, controlling of ingot casting quality, multi-stage homogenizing treatment technology, extrusion molding technology, and two-stage quenching and three-stage aging technology of strengthening-toughening heat treatment, the high-toughness and corrosion-resistant aluminum alloy profile is produced, the residual stress of the profile is effectively reduced by increasing the tension straightening quantity, and the subsequent machining precision of the profile is improved. The high-toughness and corrosion-resistant aluminum alloy profile for the aerospace is applied to the field of aluminum alloy profile preparation.
Owner:NORTHEAST LIGHT ALLOY CO LTD

Dendritic waterborne polyurethane-based high-molecular dye and preparation method thereof

ActiveCN109880060AHigh functionalityMany branched chain structuresPolyesterRotary evaporator
The invention discloses a preparation method of a dendritic waterborne polyurethane-based high-molecular dye, a polymer polyol and a dendritic polyester polyol are subjected to dehydration treatment for 2-3 hours under the conditions that the temperature is 100-110 DEG C and the vacuum degree is less than or equal to 0.1 mpa; under the protection of nitrogen, the dendritic polyester polyol, polyisocyanate and a catalyst are sequentially added into a reaction container for reacting for 3-8 hours at the temperature of 90-95 DEG C; the polymer polyol and a solvent are added for reacting at 80-90DEG C for 2-3 hours; a hydrophilic chain extender and a catalyst are added for reacting at 70-80 DEG C for 2-3 hours; a small molecular dye and a solvent are added for reacting for 2-3 hours at the temperature of 60-80 DEG C; after cooling to 30-50 DEG C, a neutralizer is added reacting for 30-60 minutes; a salt forming agent is added, and dispersing is performed for 20-30 minutes at a high speed;and in a rotary evaporator, rotary stirring is performed to remove the solvent at the temperature of 75-80 DEG C to obtain the dendritic waterborne polyurethane-based high-molecular dye the dye; andthe dendritic waterborne polyurethane-based high-molecular dye the dye has the characteristics of high temperature resistance, chemical resistance and corrosion resistance.
Owner:浙江材华科技有限公司

Preparation process of magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversion film

The invention belongs to the technical field of magnesium alloy processing, and provides a preparation process of a magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversionfilm. According to the method, a magnesium alloy conductive-anti-corrosion chemical conversion film which is suitable for a wet and heat environment is prepared by combination of acid pickling pretreatment and chemical conversion treatment; reasonable two-phase height difference of the surface of magnesium alloy is obtained by the acid pickling pretreatment, and a sufficient growth space is reserved for formation of a Mg(OH)2 corrosion product on an alpha phase; the magnesium alloy which has been subjected to the acid pickling pretreatment is subjected to chemical conversion treatment to obtain a film layer which has a uniform and flat surface and is excellent in corrosion resistance; and the magnesium alloy which has been subjected to the acid pickling pretreatment is subjected to the chemical conversion treatment to obtain the film layer which is good in conductivity, and still has good conductivity in the wet and heat environment. The preparation process has the advantages of simplicity, simplicity and convenience in operation, low cost and the like, and has important significances on engineering application of the magnesium alloy in the field of 3C products.
Owner:NORTHEASTERN UNIV

Grid structure of lead-acid storage battery

The invention relates to a lead-acid storage battery and in particular relates to a grid structure of a lead-acid storage battery. The grid structure comprises a lead core net, wherein the lead core net comprises an edge frame, multiple transverse reinforcing ribs and multiple vertical reinforcing ribs; wrapping layers are arranged on the outer surfaces of the edge frame and the transverse and vertical reinforcing ribs; the wrapping layers refer to plastic layers, conductive plastic layers, ceramic layers or conductive ceramic layers; and the thickness of each wrapping layer is greater than or equal to 0.2mm and is smaller than or equal to 2mm. According to the grid structure disclosed by the invention, the wrapping layers are arranged on the outer surfaces of the edge frame and the transverse and vertical reinforcing ribs, so that the structural strength of the grid is improved, the possibility of deformation and breakage of the grid during use is reduced, and particularly phenomena, such as battery current collection, convergence and delivery failures, caused under the condition that the edge frame and the transverse and vertical reinforcing ribs are corroded in the process of using the grid can be avoided. Therefore, the grid structure of the lead-acid storage battery disclosed by the invention has the beneficial effects that the condition that the battery failure is caused due to the battery current collection, convergence and delivery failures which are caused by easiness in corrosion and breakage of the ribs difficultly occurs.
Owner:CHAOWEI POWER CO LTD
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