953results about How to "Reduced corrosion resistance" patented technology

The invention discloses a petroleum wellhead annular space sealing device. The petroleum wellhead annular sealing device is used for sealing an annular space between a wellhead sealing body and a petroleum pipe, at least one annular groove is formed in the inner wall surface of the sealing body, and the sealing body is provided with an injection hole which is communicated to a centrifugal end of the annular groove; the petroleum wellhead annular space sealing device further comprises a sealing ring, a power ring, and an injection component, wherein the sealing ring is embedded into the annular groove, the sealing ring is used for sealing the groove in the radial direction by being jointed to the wall surface of the annular groove, and is used for sealing the annular space by being jointed to the outer wall of the petroleum pipe, the power ring is installed in the annular groove and is located between the groove bottom of the annular groove and the sealing ring, and the injection component is installed in an inlet of the injection hole, and is used for injecting fluid with given pressure so as to make the power ring push the sealing ring to tightly press the petroleum pipe. In the petroleum wellhead annular space sealing device, the requirement for deformation capability of a sealing part is low, and meanwhile the sealing capability can be effectively improved.

The object of the present invention is to provide, in the production of semiconductor circuit elements, a photoresist residue removing liquid composition which is excellent for removing photoresist residues after dry etching without attacking the wiring material or the interlayer insulating film etc.

This is made possible by a photoresist residue removing liquid composition containing one or more members selected from the group consisting of reducing compounds and their salts and one or more members selected from the group consisting of aliphatic polycarboxylic acids and their salts.

The invention relates to a fuel cell metal bipolar plate with the conductive and anti-corrosion plating and a preparation method thereof. Chromium-nitrogen-carbon ternary composite step plating is formed on the surface of the metal bipolar plate by using a closed field unbalanced magnetron sputtering technology, and a pure chromium base layer, a chromium nitride transition layer, a chromium-carbon-nitrogen coexistence layer and an amorphous carbon layer are arranged upwards successively on the surface of the metal bipolar plate. Compared with the prior art, the fuel cell metal bipolar plate with the conductive and anti-corrosion plating and the preparation method thereof combine toughness of the chromium nitride, the corrosion resistance of the chromium carbide and the conductivity of amorphous carbon film fully, and the chromium nitride, the chromium carbide and the amorphous carbon film are composited through a step transition method. The modified metal bipolar plate film base binding force is improved apparently, the corrosion resistance and the conductivity are enhanced apparently, and high-performance and long-time use requirements of the fuel cell metal bipolar plate can be met.

An object of the present invention is to provide a corrosion resistant steel excellent in strength and low temperature toughness as well as resistance to corrosion by carbon dioxide and seawater, and most suitable for oil well steel pipes and line pipes for production and transportation of gas, petroleum, etc. used in the field of energy, or a steel for plants, and corrosion resistant oil well steel pipes. The corrosion resistant steel and the corrosion resistant oil well steel pipes comprise, based on weight, up to 0.30% of C, up to 1.0% of Si, 0.2 to 2.0% of Mn, 2.1 to less than 5.0% of Cr, up to 0.03% of P, up to 0.02% of S, up to 0.10% of Al, up to 0.015% of N, optionally containing Cu, Ni, Mo, Ti, Nb and B, and the balance of Fe and unavoidable impurities, and have a martensitic structure as their metallic structure.

The invention discloses a method for treating wood at high temperature and with hot water, comprising following steps: (1) putting wood in high temperature furnace; increasing temperature at furnace to 120-150 Deg. C and keeping temperature; (2) increasing temperature to 180-240 Deg .C when the water content of wood reduced to lower than 5%; keeping temperature and the time is 0.5-3 hours according to wood thickness per cm; (3) reducing temperature at furnace, treating wood with steam or hot water when temperature is reduced below 100 Deg. C to reduce wood water content to 7-10%; (4) reducing temperature continuously and getting wood out of furnace when the temperature inside wood is reduced to about 40 Deg. C; (5) balancing at atmosphere for more than 15 days. The invention can increase size stability, rotproofness and weather ability of wood, and the wood can be applied in environment with large change in humidity and temperature.

The invention discloses molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and a manufacturing method thereof. The molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance contains: by weight, 0.03 to 0.10% of C, 0.2 to 1.0% of Si, 4.0 to 9.0% of Mn, 16.5 to 18.0% of Cr, 1.5 to 3.5% of Ni, 0.15 to 0.35% of N, 0.2 to 0.8% of Mo, 0.01 to 2.5% of Cu, less than or equal to 0.1% of one or more of V, Nb, Ca and B, and the balance Fe and unavoidable impurities. Through the manufacturing method, Ni content is controlled in a rang of 1.5 to 3.5%, and Mn and N elements are added to replace precious metal Ni to be utilized for austenitizing, so that a microstructure of room-temperature austenite is obtained. The manufacturing method adopts 0.2 to 0.8% of Mo and utilizes a synergistic effect of Cr, Mo and N to improve corrosion resistance. Through the manufacturing method, the pitting-resistance equivalent number of the molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance is great than or equal to 18 and the pitting potential is great than or equal to 330mV, wherein the properties of the molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance are equivalent to or superior to corresponding properties of 304 austenitic stainless steel.

A method of producing an aluminium alloy brazing sheet for the manufacturing of light brazed assemblies, wherein said brazing sheet has good formability, combined with a low susceptibility to core penetration in the end annealed as-produced condition after stretching, forming and/or shaping and brazing are disclosed. Assemblies made according to the method are also disclosed.

The invention relates to composite modified asphalt. The composite modified asphalt is prepared from the following raw materials in percentage by weight: 23.1-45.5% of polyurethane modified epoxy resin, 5-10% of compatibilizer, 5-10% of plasticizer, 5-10% of curing agent and 40-60% of road petroleum asphalt, wherein the polyurethane modified epoxy resin is terminal-amino polyurethane modified epoxy resin, terminal-isocyanato polyurethane modified epoxy resin or imidazolyl-terminal-capped polyurethane modified epoxy resin, the compatibilizer is naphthalene oil, asphalt tar or a mixture of naphthalene oil and asphalt tar, the plasticizer is dioctyl phthalate, dibutyl phthalate or a mixture of dioctyl phthalate and dibutyl phthalate, the curing agent is a modified aromatic amine curing agent, and the road petroleum asphalt is 70# petroleum asphalt, 90# petroleum asphalt or 110# petroleum asphalt. The road performance of concrete adopting the polyurethane epoxy resin composite modified asphalt further meets the requirements of technical specifications and surpasses that of the similar imported product Japan Epoxy, so that the composite modified asphalt can be widely applied to the construction of steel bridge deck pavement, and has great significance in opening a market for domestic epoxy asphalt materials.

The invention relates to the technical field of harmlessness treatment of smelting wastes, and especially relates to a ceramsite prepared by using smelting wastes, and a preparation method thereof. The ceramsite comprises 10-90% of smelting waste powder, 5-40% of municipal sludge, 4-20% of fly ash, 0-20% of gangue and 0.1-10% of a curing agent. The preparation method of the ceramsite comprises the following steps: 1, crushing the smelting wastes by using a crusher to prepare the smelting waste powder; 2, weighing the smelting waste powder, the municipal sludge, the fly ash, gangue and the curing agent, mixing, and uniformly stirring to prepare ceramsite powder; 3, conveying the ceramsite powder to a ball forming granulation machine, and carrying out granulation molding to prepare ceramsite balls; 4, drying the ceramsite balls; and 5, calcining he dried ceramsite balls to prepare the finished ceramsite. The ceramsite prepared in the invention has the advantages of light weight, environmental protection and wide uses; and the preparation method recycles the smelting wastes, and has good economic and social benefits.

The invention relates to a multifunctional composite material armor plate and a preparation method thereof. The armor plate comprises multiple structures of a rigid reinforcing layer, a middle bulletproof layer, a back bulge prevention layer and a buffer layer and the multiple structures are formed by die pressing, wherein the rigid reinforcing layer is formed from a fiber fabric, which is made of one or a plurality of aramid fibers and high-performance carbon fibers, and modified thermosetting resin by impregnation; the middle bulletproof layer is formed from a mixed fiber fabric, which is made of ultrahigh molecular weight polyethylene fibers and high-performance carbon fibers, and modified thermoplastic resin by impregnation; the back bulge prevention layer is formed by a fiber fabric, which is made of high-performance carbon fibers, and modified thermosetting resin by impregnation; the buffer layer is made of organic silicon or polyurethane foam. The invention provides the armor plate which is prepared by adopting multilayer laying and vacuum die-pressing integrated forming and has the characteristic of infrared stealth and has high intensity, high rigidity, low back bulge property, corrosion resistance and heat resistance.

Hydrogen embrittlement is prevented in Sm₂Co₁₇-based magnets and R₂Fe₁₄B-based magnets by metal plating the magnet, then carrying out heat treatment, or by forming a metal oxide or metal nitride layer on the metal plating layer or directly on the magnet itself.

The invention provides an ultra high-temperature resistant nickel-chrome alloy and a manufacturing method thereof, wherein the ultra high-temperature resistant nickel-chrome alloy has a higher meltingpoint, can resist the high temperature higher than 1300 DEG C for a long time and has better tensile strength and yield strength simultaneously. The ultra high-temperature resistant nickel-chrome alloy basically comprises the following components in percentage by weight: 21-25 of Cr, 58-63 of Ni, Al which is not less than 1 and not more than 1.7, Cu which is not less than 0.5 and not more than 1.0, C which is not less than 1 and more than 0.1, Si which is not less than 0.5 and more than 0, Mn which is larger than 0 and not more than 1.0, S which is larger than 0 and less 0.015, and the balance of Fe. The manufacturing method comprises the following steps: mixing the materials according to the alloy components and then smelting; carrying out secondary refining; first heating the mixture to900-1200 DEG C, keeping the temperature for 10-40 minutes, and then forging; cold processing; and water cooling. The invention improves the high-temperature resistant performance, the tensile strength and the yield strength of the alloy, and has better comprehensive benefit. The manufacturing method solves the problems of alloy smelting and heat processing, and improves the product purity.

The present invention relates to a non-stick coating layer with characteristics of high hardness, scratch resistance and corrosion resistance. The coating layer comprises a prime coat containing PES and PEEK, and a surface coat containing a fluorocarbon resin and PEEK, wherein the prime coat contains 20-30% of the PES and 20-30% of the PEEK, and the surface coat contains 20-30% of the PEEK and 3-10% of the fluorocarbon resin. The present invention further provides a coating method for the non-stick coating layer. Compared with the conventional aqueous fluorine-containing resin non-stick coating layer, the coating layer of the present invention provides significantly improved hardness, scratch resistance, corrosion resistance and other performances.

The invention relates to hot-dip zinc aluminum magnesium silicon rare earth coated steel strips taking air as an air source of an air knife during production. The coating material on the surface of the steel strips comprises the following components in percentage by weight: 9.9 to 12.1 percent of Al, 1.0 to 1.8 percent of Mg, 0.18 to 0.22 percent of Si, 0.01 to 0.3 percent of rare earth (RE), and the balance of Zn. Based on a quaternary component Zn-Al-Mg-Si in Nippon Steel, the rare earth (RE) comprising lanthanum and cerium is added into the coating material so as to become a quintuple component Zn-Al-Mg-Si-RE, and the content of the magnesium is reduced. Because of the addition of the trace RE, the component distribution of the coating can become more uniform, the organizational structure is more uniform, and the corrosion resistance is further improved based on the original corrosion resistance; and because the content of the magnesium is reduced properly, the coating can bear the blowing of the air knife and cannot be oxidized and discolored on the premise of ensuring high corrosion resistance, and meets the requirements of the corrosion resistance and apparent mass.

The invention relates to a vacuum brazing and thermal treatment composite process for a stainless steel surgical instrument and the application of the process. An embedding method is adopted for embedding cemented carbide in the working end of the stainless steel surgical instrument, vacuum brazing and vacuum thermal treatment are adopted for synchronous treatment, the two processes are combined into one process, and on the basis of controlling the vacuum degree, the heating speed, the heating temperature, the brazing temperature, the brazing opportunity and the cooling method, the stainless steel surgical instrument with the working end embedded with the brazed cemented carbide is obtained. The stainless steel surgical instrument has excellent abrasive resistance, anti-slip performance, anti-corrosive performance and the like, the product quality is high, the energy consumption is low, the production rate is high and the operation environment is improved, and quality defects of the original process are overcome. The composite process has great significance in the process of treating stainless steel surgical instruments.

A ceramic filter has (A) a base body having partition walls made of a ceramic porous body, wherein cells 18 are defined by the partition walls, (B) filer membranes provided on the partition walls, made of a ceramic porous body having an average pore diameter smaller than that of the surface of each partition wall, and (C) a glass seal provided so as to cover at least the end face of the base body, wherein the glass seal is constituted by an alkali-free glass containing silica (SiO2) in an amount of 55 to 65 mol %, zirconia (ZrO2) in an amount of 1 to 10 mol % and at least one kind of alkaline earth metal oxide selected from calcia, baria and strontia but substantially not containing zinc oxide.

The invention discloses a before-coating metal surface treatment method. The before-coating metal surface treatment method comprises such steps as oil removal, alkali washing, acid washing, two times of water washing and phosphorization. Adopted environment-friendly alkaline cleaning liquid has the technical effects of energy conservation and environmental protection, and has an excellent cleaning effect on both black metal and nonferrous metal; adopted phosphorization liquid has such advantages as quick film formation, strong paint film bonding force, good corrosion resistance, capability of operating through brushing or spraying, simple operation and low cost; the prepared phosphorization liquid reduces phosphorization liquid sediments, and guarantees the quality of phosphorized film; and the film layers are uniform and exquisite, so that the metal surface treatment method can realize the before-coating metal surface treatment more environment-friendly and more efficiently, and has active effects on the coating process and the coating quality.

The invention discloses a bipolar plate of a fuel cell and a method for preparing a carbon titanium nanocomposite film on the surface thereof, belongs to the technical field of surface modification of metallic materials and fuel cells, and relates to a bipolar plate of a regenerative fuel cell and a proton exchange membrane fuel cell and a preparation technology of a surface modified film of the bipolar plate. The bipolar plate consists of a metal thin plate substrate and carbon titanium nanocomposite films which are formed on the surfaces at two sides of the substrate, wherein the metal thin plate substrate is a titanium plate and a stainless steel plate; the carbon titanium nanocomposite film is an amorphous and nanocrystalline composite film which is prepared on an amorphous carbon substrate with an arc ion film plating method and on which titanium and titanium carbide nanocrystals are distributed; the thickness of the film is of micron dimension; and the size of the crystal grains of the nanocrystals is of micron dimension. The invention has the effects and advantages that: the bipolar plate is low in manufacturing cost, has prominent composite performance such as corrosion resistance, conductivity, hydrophobicity and the like, can be used for replacing a noble metal bipolar plate and a graphite bipolar plate, and can be used as a cell bipolar plate of the proton exchange membrane fuel cell and an electrolytic cell bipolar plate of the regenerative fuel cell.

A cell of a fuel cell includes a membrane electrode assembly, and metal first and second separators which sandwich the membrane electrode assembly to form gas flow paths disposed on each side of the membrane electrode assembly. A back surface of the first separator and a back surface of the second separator, the first separator and the second separator being included in adjacent cells, are in contact with each other, thereby forming a temperature-control medium flow path between the first separator and the second separator. In the first separator and the second separator, corrosion-resistant coating layers are provided only on reaction-side surfaces of the first separator and the second separator, the reaction-side surfaces facing the membrane electrode assembly, and portions where the back surface of the first separator is in contact with the back surface of the second separator are joined by welded portions.