185results about How to "Increase corrosion rate" patented technology

An implantable medical device is provided that degrades upon contact with body fluids so as to limit its residence time within the body. The device is formed of a porous corrodible metal to simultaneously provide high strength and an accelerated corrosion rate. The corrosion rate of a device formed of metal subject to self-dissolution or of a combination of metals subject to galvanic corrosion is accelerated by its porous structure. Coating the corrodible metallic device with a degradable polymer serves to delay the onset of corrosion of the underlying metallic structure.

The invention discloses wind power flange alloy steel and a preparation technology of parts thereof. The alloy steel comprises the following chemical compositions: carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, vanadium, nickel, copper, nitrogen, oxygen, hydrogen, rare earth and the balance of iron and the inevitable impurities. The preparation technology of the alloy steel parts comprises the following steps: pretreating molten iron, smelting in a converter, performing external refining, casting steel ingots, performing flame cleaning, heating, forging, slowly cooling, performing heat treatment, machining, performing flaw detection, inspecting, packaging and warehousing. Compared with the existing alloy steel used in the wind power generation at home and aboard, the alloy steel disclosed by the invention has higher tensile strength, yield strength, elongation after fracture and reduction of area, particularly higher low-temperature impact toughness. The atmosphere corrosion resistance and the sea atmosphere corrosion resistance are increased by two levels.

The invention discloses a material used in offshore wind power equipment, and a workpiece manufacturing process. The material comprises the chemical components of carbon, silicon, manganese, phosphorous, sulfur, chromium, nickel, molybdenum, vanadium, copper and rare earth, and balance of iron and inevitable impurities. According to the invention, through steps of high-quality molten iron selecting, KR molten iron pre-treating, top and bottom composite converter blowing, argon blowing treating, LF furnace refining, VD vacuum degassing treating, round billet continuous casting, heap cooling, sawing and blanking, billet heating, free forging, punching, fine coining, heat treating, mechanical processing, flaw detecting, inspecting, packaging, storing, and the like, a material used in key components of offshore wind power equipment of more than 5 megawatts can be produced. The material is advantageous than Q345E-performance steel, high yield strength, good low-temperature impact toughness, and better marine-atmosphere-corrosion resistance. The invention adopts a serried of optimizing technical measures upon smelting and manufacturing processes of the steel, such that user requirements are satisfied.

Disclosed herein is a non-toxic, bioresorbable, magnesium based alloy for use in production of implants. Specifically exemplified herein are alloy embodiments useful for orthopedic implants. Also disclosed are alloy materials that incorporate magnesium, calcium and strontium.

The invention provides a surface treated metal and a surface treatment method thereof and a metal resin complex and a preparation method of the metal resin complex. The surface treated metal comprises a metal body and an anodic oxidation film layer which is located on the surface of the metal body, the anodic oxidation film layer includes a barrier layer which is in contact with the metal body and a loose layer located on the outer surface of the barrier layer, the loose layer contains anodic oxidation film micropores, the pore diameter of the anodic oxidation film micropores is 10 nm-800 mum, the barrier layer contains barrier layer corrosion pores, the pore diameter of the barrier layer corrosion pores is 10 nm-800 mum, the metal body includes a corrosion layer which is in contact with the barrier layer, the corrosion layer contains metal corrosion pores, the pore diameter of the metal corrosion pores is 10 nm-1 mm, the metal is aluminum alloy or aluminum, the bonding force between the metal and resin is strong, and the surface treated metal is simple in process, is easy for large-scale production, and has no pollution.

The invention provides solder removing liquid, a preparation method and application thereof. The solder removing liquid comprises the following components in percentage by weight: 15-50 percent of nitric acid, 1-20 percent of ferric nitrate or ferric chloride, 1-5 percent of sulfoacid and the balance of water. The solder removing liquid provided by the invention has the advantages of strong oxidability, high speed of dissolving solder, simpleness and easiness of raw materials, low preparation cost, no containing of a stabilizing agent and simple formulation and favorability of recycling valuable metals in waste liquid; and the waste solder removing liquid formed after desoldering can stand to generate beta-stannic acid sediment and is convenient for recovering tin metal.

A tastable, moldable, and/or extrudable structure using a metallic primary alloy. One or more additives are added to the metallic primary alloy so that in situ galvanically-active reinforcement particles are formed in the melt or on cooling from the melt. The composite contains an optimal composition and morphology to achieve a specific galvanic corrosion rate in the entire composite. The in situ formed galvanically-active particles can be used to enhance mechanical properties of the composite, such as ductility and/or tensile strength. The final casting can also be enhanced by heat treatment, as well as deformation processing such as extrusion, forging, or rolling, to further improve the strength of the final composite over the as-cast material.

The present invention relates to the composition and production of an engineered degradable metal matrix composite that is useful in constructing temporary systems requiring wear resistance, high hardness, and/or high resistance to deformation in water-bearing applications such as, but not limited to, oil and gas completion operations.

The invention belongs to the water processing technology application field, relates to a method for removing nitrate nitrogen in water, and especially relates to a method for the zero-valent metal and carbon combination internal electrolysis catalysis reduction of a pollutant nitrate nitrogen in water. A technological principle of the method is characterized in that the reductibility of a zero-valent metal elementary substance and the internal electrolysis effect of the zero-valent metal elementary substance and conductive substances comprising active carbon and the like are utilized to accelerate the transfer of electrons in a solid-liquid phase interface, so nitrate nitrogen is rapidly reduced and removed, and the zero-valent metal can prolong the service life because of the internal electrolysis effect, thereby the reaction efficiency is improved. The method is characterized in that the granular or powdery zero-valent metal and a carbon material are directly added to or are mixed and then added to water containing nitrate nitrogen, stirring is carried out in a certain strength under reacting, and nitrate is directly reduced on the surface of the metal, and is reducibly degraded under the action of nascent state hydrogen [H] generated by an electrode reaction in the internal electrolysis process. The method has the advantages of simple operation, convenient management, less secondary pollution and high reaction time and space efficiency.

The invention relates to a composite structure silicon-based germanium quantum dot material. The composite structure material comprises a porous silicon substrate and germanium quantum dots growing on the porous silicon substrate. An ultrasonic enhancement method is used for improving the corrosion rate of the silicon substrate and the evenness of holes, and the growing process of magnetron sputtering and later-period annealing is adopted on the aspect of quantum dot growth; the composite structure silicon-based germanium quantum dot material has high photoelectric converting efficiency; the safety of a preparation method is high, operation is easy, and a good industrialization prospect can be achieved.

The invention discloses a corrosion-resisting rebar with the yield strength in 500 MPa grade and a production method, and belongs to the technical field of corrosion-resisting steel for construction.The rebar comprises, by weight, the chemical components including 0.05-0.10% of C, 0.30-0.60% of Si, 1.20-1.50% of Mn, 1.00-1.50% of Cr, 0.10-0.20% of Ni, 0.20-0.40% of Cu, 0.10-0.20% of Mo, 0.06-0.10% of V, 0.010-0.025% of Ti, 0.035% or less of P, 0.010% or less of S and the balance Fe and inevitable residual impurity elements. According to the rebar, by adding small amounts of the alloying elements and fully using each individual element and the synergistic action among the elements, the corrosion resistance performance of the rebar is improved; the production method of the rebar comprises the steps of conventional smelting and casting and adoption of a controlled rolling and controlled cooling technology on a bar mill; noble metal elements in the rebar are low in contents, the toughness, the weldability and the corrosion resistance performance of the rebar are excellent, resources are saved, and the production cost is low.

The invention provides a weather-proof cold heading steel wire rod for a 1000MPa-grade fastener and a production method of the weather-proof cold heading steel wire rod. The steel wire rod comprises the following components in percentage by weight: 0.25%-0.55% of C, 0.10%-0.40% of Si, 0.80%-1.20% of Mn, smaller than or equal to 0.035% of P, smaller than or equal to 0.040% of S, 0.40%-0.70% of Cr, 0.15%-0.45% of Ni, 0.20%-0.40% of Cu, 0.15%-0.45% of Mo, and the balance of Fe and inevitable impurity elements. The production method comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, continuous casting, continuous rolling, billet cleaning, heating, rolling and finishing. Various properties of a 1000MPa-grade weather-proof connecting pair manufactured byusing the cold heading steel wire rod provided by the invention meet the standard requirements. The corrosion rate of the steel wire rod in the accelerated corrosion test is lower than 1/3 of that ofthe common cold heading steel.

The invention relates to a vitreous etching bath, which comprises 0.5%-8% microcosmic salt, 0.5%-8% pyrophosphate, 0.01%-0.5% inorganic alkaline, 5%-45% surface activator and 39%-93% water. The preparing method comprises the following steps: adding the microcosmic salt and the pyrophosphate in the water, heating in order to dissolve; adding inorganic alkaline and non-ionic surface activator and mixing. The invention can remove greasy dirt, fingerprint, particles and sio2 for buffed glass base plate, which can removes the impurity and Ceo2 on the glass, achieves the request of the environmental protection.

The invention discloses environment-friendly monocrystalline silicon piece texturing liquid. The environment-friendly monocrystalline silicon piece texturing liquid is characterized by being prepared from, by weight, 0.5-1 part of sodium hydroxide, 3-5 parts of additives, 2-4 parts of sodium citrate, 0.5-1 part of dodecyl dimethyl betaine, 0.2-0.4 part of coco fatty acid diethanol amide, 0.01-0.02 part of konjac glucomannan, 1-2 parts of glycerin, 0.1-0.2 part of polysorbate-80 and 80-100 parts of water. By means of the environment-friendly monocrystalline silicon piece texturing liquid, the consistency and the repeatability of the texturing technology are effectively improved, and the density of the texturization surface is increased, so that the efficiency of a solar cell is improved, and the production quality is improved; IPA is not contained, environmental protection and human health are facilitated, the main raw materials are easy to degrade, residues in the environment do not exist, pollution does not exist, and the environment-friendly monocrystalline silicon piece texturing liquid is green and environmentally friendly.

Earth-boring casing shoes include a crown configured for at least one of drilling and reaming a wellbore when the crown is attached to a section of casing and the casing is advanced into a wellbore. The crown includes a body comprising a corrodible composite material, and at least one cutting structure carried on the body. The casing shoes further include connection structure configured for attachment to a section of casing. Methods are used to form such casing shoes, and such casing shoes are used to install casing within wellbores.

A bioabsorbable medical device or a medical device component comprises an absorbable component prepared by subjecting a prefabricated component of an iron-based raw material to ion nitriding. Substance composition inside the absorbable component changes with the depth from the surface. The absorbable component comprises at least a first part and a second part. The first part surrounds the second part. Hardness of the first part is higher than hardness of the second part. An interface exists between the first part and the second part. A crack generated in the first part is impeded by the interface when extending to the second part. On the premise of ensuring radial stand strength, the bioabsorbable medical device or medical device component and a preparation method thereof reduce wall thickness of an iron-based stand, improve a stand corrosion rate and malleability, and achieve broader adaptability.

The invention discloses a method for rapidly evaluating the performance of a weather-resistant steel rust layer for a power transmission tower in an industrial atmospheric environment, and belongs tothe technical field of performance evaluation of the weather-resistant steel rust layer. According to the method, NaCl with the concentration of 0.5% is added into a traditional simulated corrosion solution according to the service characteristics of a simulated industrial atmospheric corrosion environment, so that the corrosion rate is increased, and a corrosion mechanism is not changed; a brokenline graph is drawn by using multiple groups of sample data, inflection point coordinates are taken as corrosion resistance evaluation values, so that the durability of weather-resistant steel in theindustrial atmospheric environment is effectively evaluated; test results show that a soaking test and a week soaking test in the industrial environment show similar rules, the corrosion rate can beincreased by the soaking test, the test period is effectively shortened, and equipment is cheap, operation is easy, and popularization significance is achieved.

Problem

To provide an aluminum alloy brazing sheet, featuring a good brazing property that prevents diffusion of molten filler material in a core material of the aluminum alloy brazing sheet during a brazing process and exhibiting a superior corrosion resistance to an exhaust gas condensate water after the brazing process, a method of manufacturing the aluminum alloy brazing sheet, and a high corrosion-resistant heat exchanger using the aluminum alloy brazing sheet.

Resolving Means

A high corrosion-resistant aluminum alloy brazing sheet comprises a core material composed of an aluminum alloy, a sacrificial anode material cladded on one surface of the core material, and a filler material composed of an Al/Si-based alloy and cladded on another surface of said core material, and is characterized in that the sacrificial anode material is composed of an aluminum alloy which contains Si falling within a range of 2.5-7.0 mass %, Zn falling a range of 1.0-5.5 mass %, Fe falling within a range of 0.05-1.0 mass %, and which is composed of the balance Al and the inevitable impurities, and that a clad thickness of the sacrificial anode material falling within a range of 25-80 μm. Also, there is provided a method of manufacturing the aluminum alloy brazing sheet, and a high corrosion-resistant heat exchanger using the aluminum alloy brazing sheet.