1201results about How to "Improve corrosion resistance" patented technology

A copper-based or silver-based alloy thin film is provided for the highly reflective or semi-reflective layer of optical discs. Alloy additions to silver include gold, palladium, copper, rhodium, ruthenium, osmium, iridium, beryllium and platinum. Alloy additions to copper include silver, cadmium, gold, magnesium, aluminum, beryllium, zirconium, and nickel. These alloys have moderate to high reflectivity and reasonable corrosion resistance in the ambient environment.

This invention provides cement compositions that comprise a high alumina cement, vitrified shale, a soluble phosphate, and water sufficient to form a slurry. This invention also presents methods of enhancing the corrosion resistance of a cement composition that comprise the step of adding vitrified shale to the cement composition.

The present invention has an object of providing a carbon nanotube dispersed composite material utilizing as much as possible excellent electric conductivity, heat conductive property and strength property owned by a carbon nanotube itself and taking advantage of characteristics of ceramics having corrosion resistance and heat resistance such as zirconia and the like, and a method of producing the same; and long-chain carbon nanotubes (including those obtained by previous discharge plasma treatment of only carbon nanotubes) are kneaded and dispersed by a ball mill together with calcinable ceramics and metal powder, and this is integrated by discharge plasma sintering, and carbon nanotubes can be thus dispersed in the form of network in the sintered body, and the electric conductivity property, heat conductive property and strength property of the carbon nanotube can be effectively used together with the properties of the ceramics and metal powder base material.

A method to use a novel structured metal-ceramic composite powder to improve the surface electrical conductivity of corrosion resistant metal substrates by thermal spraying the structured powder onto a surface of a metallic substrate is disclosed. The structured powder has a metal core and is wholly or partially surrounded by an electrically conductive ceramic material such as a metal nitride material. The metal cores may have the ceramic material formed on them prior to a thermal spraying process performed in an inert atmosphere, or the thermal spraying may be performed in a reactive atmosphere such that the ceramic coating forms on the cores during the thermal spraying process and/or after deposition. The metal cores will bond conductive ceramic material onto the surface of the substrate through the thermal spray process.

The invention discloses a high-flexibility high-strength stainless steel and a method for making the same, wherein the method comprises the following steps of: 1) preparing parent alloy, the chemical compositions by weight percentage of which are: less than or equal to 0.03 percent of C, less than or equal to 0. 10 percent of Mn, less than or equal to 0.10 percent of Si, less than or equal to 0.002 percent of S, less than or equal to 0.006 percent of P, 6.0 to 13.0 percent of Cr, less than or equal to 0.05 percent of Al, less than or equal to 0.10 percent of Cu, less than or equal to 0.05 percent of Ti, the balance Fe and unavoidable impurities; 2) melting an electrode with a vacuum induction furnace, in which the parent alloy is prepared with pure iron, nickel, and other metal material for melting the electrode; 3) vacuum consumable remelting, at a melting speed of between 180 and 220 Kg/h; 4) forging, in which steel ingots are heated at a temperature of 1180+-20 DEG C, with the temperature maintained for 3 to 6 hours, and are upset and drawn twice, and the forging temperature is above 850 DEG C. The stainless steel of the invention has matched combination properties including 1800Mpa strength, 1400 Mpa yield strength, 50J impact ductility, more than 100 Mpa fracture toughness.

The invention provides a preparation method of an efficient Ni-Mo-P/Ni hydrogen evolution electrode, which belongs to the field of electro-catalysis hydrogen evolution. The method comprises steps as follows: removing an oxide layer and oil matters from the surface of a nickel sheet by mechanical polishing and ultrasonic washing; then plating the surface of the pre-processed nickel sheet by pulse electrodeposition, doping P into an Ni-Mo coating to form an Ni-Mo-P nano-crystalline coating with excellent hydrogen evolution performance, wherein the Ni-Mo-P nano-crystalline coating is plated uniformly and is located between a crystalline state structure and an amorphous state structure. The method is simple and feasible, the production cost is low; and the Ni-Mo-P/Ni hydrogen evolution electrode prepared by the method is not only applicable to electro-catalysis hydrogen evolution in chlorine alkali industry, but also is widely applicable to various catalytic hydrogen evolution fields such as solar hydrogen production by water electrolysis, and water electrolysis industry and the like.

The present invention relates to subterranean well cementing operations, and more particularly, to cement compositions having improved corrosion resistance and methods of using such compositions in subterranean formations. The cement compositions generally include an unhydrated cement that includes a high alumina cement, a silica source, and a soluble phosphate; and a set retarder that includes a water soluble carboxylic acid. Optionally, other additives may be included, such as accelerants, dispersants, weighting agents, and the like.

The invention discloses a main iron runner pouring material. The pouring material comprises alumina, brown aluminum oxide, SiC, modified nano carbon powder, SiO2 micropowder, calcium aluminate cement, alpha-Al2O3 micropowder, explosion-proof fiber, metal silicon powder, sodium tripolyphosphate and AL(OH)3 and Mg(OH)2 composite sol suspension. In the invention, the AL(OH)3 and Mg(OH)2 composite sol suspension is used as a nano ceramic binding agent and directly added into a mixture and forms a spinel nano structure substrate by in situ synthesis reaction to obtain the nano AL2O3 and MgO composite oxide ceramic combined main iron runner pouring material disclosed by the invention; after carrying out the secondary spinel synthesis reaction, densification is generated along with expansion under constraint, and thereby, macro-and-micro structure improvement, performance improvement and durability enhancement are obtained, and the main iron runner pouring material with high erosion resistance and infiltrating resistance, scour resistance, high thermal shock resistant stability and large iron flux is prepared.

The invention relates to water-based ultraviolet curing coating, containing water-based ultraviolet curing resin, a photo initiator, accessory ingredients and water; the water-based ultraviolet curingcoating is characterized in that: the water-based ultraviolet curing coating also comprises acrylic emulsion and corrosion inhibitors, all constituents are as follows by mass fraction: 15-45 percentof the water-based ultraviolet curing resin, 15-45 percent of the acrylic emulsion, 2-10 percent of photo initiators, 2-5 percent of the corrosion inhibitors, 0.2-1 percent of the accessory ingredients, and the balance of water; wherein the acrylic emulsion has the function of enhancing adhesive force, so as to greatly improve the adhesive force of the coating on a metal surface, be beneficial toimproving the anti-corrosion performance of coatings without needing reactive diluent to adjust the adhesive force of the coating and reduce the harm of the reactive diluent to environment and human body; wherein the defined amount of the corrosion inhibitors increases the anti-corrosion performance of the coating. The water-based ultraviolet curing coating is particularly suitable for protectivedecoration of the surfaces of metal bases,such as iron, aluminum, copper, nickel and the like, for a medium to long period.

The invention belongs to field of underwater instrument system, specially a kind of cylinder-type water tight pressureproof cabin which can pressurize the electromotion parts and load some outer pressure, it resolves problem that when diameter of cylinder is bigger, effect of encapsulation is poor. The cabin adopts column streamline shell design; frame of integral encapsulated shell comprises two end covers and a cylinder, every end cover is connected with.

The invention relates to fire-proof and corrosion-proof dual-function paint for a water-based ultrathin expansion steel structure and a preparation method thereof. Water-based epoxy emulsion and self-crosslinking silicone-acrylic emulsion are taken as film forming substances, high-polymerization ammonium polyphosphate, melamine and pentaerythritol are taken as fire-proof aid systems, titanium white, sepiolite and alumina silicate fiber which are added are taken as high temperature-resistant fillers, expansible graphite flake is particularly added and is taken as a fire-proof and corrosion-proof filler and a small number of film forming aids and water-based antifoaming agents are added simultaneously. The formed fire-proof paint has high expansion rate (about 15 times), fire endurance of up to 90 minutes (the coating thickness is 2 millimeters) and has high corrosion resistance. The preparation method of the paint is simple and environmentally-friendly and has low cost and wide application.

The invention discloses an aluminum-silicon plated steel plate for hot-press molding and its fabrication method. The steel plate is plated with an aluminum-silicon plating on its surface, wherein the plating contains (by weight percentage) aluminum 96-98, silicon 1.3-3.8 and rare earth 0.1-0.3, thickness of an alloy layer is smaller than or equal to 5 Mum, and silicon content in the alloy layer is controlled at 3-6 wt%. The fabrication method comprises pre-oxidizing a steel plate via an NOF, wherein reduction furnace atmosphere contains H2 20-50 vol% and N2 in balance, dew point in the furnace is controlled at (-20)-(-60) DEG C., annealing temperature is 800-850 DEG C., temperature of a plating solution is 680-750 DEG C., temperature of the steel plate, while being placed in an aluminum pot, is 650-750 DEG C., and immersion plating time is 2-5 s; taking the steel plate out of the aluminum pot, and rapidly cooling at speed of no smaller than 120 DEG C./s until solidifying point of aluminum-silicon alloy is achieved; and cooling to 420-480 DEG C. at speed of 30-100 DEG C./s, and performing overaging annealing at 350-450 DEG C. for 10-300 s.

The invention provides microarc-oxidized coating silylation fluid and a hole sealing method thereby. The hole sealing method by the microarc-oxidized coating silylation fluid includes: firstly, mixing deionized water, alcohol and silane coupling agent according to a volume ratio of 3-6:1:1, and adjusting pH value to obtain the microarc-oxidized coating silylation fluid; secondly, hydrolyzing the microarc-oxidized coating silylation fluid for more than 12 hours to obtain silane coupling agent hydrolyzed solution; thirdly, soaking microarc-oxidized coating in the silane coupling agent hydrolyzed solution for 19s to 20min, taking out the coating for air drying to obtain coating with absorbed hydrolyzed solution; and fourthly, heating and solidifying the coating with absorbed hydrolyzed solution at 50-300 DEG C for 15-300 minutes. The microarc-oxidized coating is silylated by the soaking-solidifying method, the process is simple, cost is low, and the hole sealing method by the microarc-oxidized coating silylation fluid is applicable to hole sealing of microarc-oxidized coatings of magnesium alloy, aluminum alloy and titanium alloy.

A process for electropolishing metals and metalloids and their alloys, intermetallic compounds, metal-matrix composites, carbides and nitrides in an electrolytic cell utilizing an externally applied magnetic force to enhance the dissolution process. The electropolishing process is maintained under oxygen evolution to achieve an electropolished surface of the work piece exhibiting reduced microroughness, better surface wetting and increased surface energy, reduced and more uniform corrosion resistance, minimization of external surface soiling and improved cleanability in shorter time periods.

An austenitic stainless steel composition including relatively low Ni and Mo levels, and exhibiting corrosion resistance, resistance to elevated temperature deformation, and formability properties comparable to certain alloys including higher Ni and Mo levels. Embodiments of the austenitic stainless steel include, in weight percentages, up to 0.20 C, 2.0-9.0 Mn, up to 2.0 Si, 15.0-23.0 Cr, 1.0-9.5 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.05-0.35 N, (7.5(% C))≦(%Nb+%Ti+%V+%Ta+%Zr)≦1.5, Fe, and incidental impurities.

The invention discloses a method for forming one layer of sol-gel coating with a compact reticular crosslinking structure on the surface of the aviation aluminium alloy substrate material. The coating and an atom on the surface of the aluminium alloy substrate material can be firmly combined by the action of a chemical bond, and the coating has good adhesive force on the substrate material. In the method, graphene is added in a coating ingredient to participate in the crosslinking structure, and therefore the anti-corrosion capability of the coating is enhanced. The coating prepared by the method has strong anti-corrosion capability and adhesive force on the surface of aviation aluminium alloy. In addition, the coating has good chemical stability and thermal stability and can resist the influence on the coating because of an external acid and alkaline environment and temperature variation. The method is simple, is convenient to operate, has low requirement on equipment, is environmentally friendly and is free from pollution.

The invention discloses a high-dimension stable corrosion-resistant martensite steel and a preparation method of a steel structural material. The martensite steel comprises the following chemical components of: C being less than or equal to 0.10, Cr being 14.0-15.5, Ni being 4.2-6.0, Cu being 2.0-3.5, Nb being 0.2-0.40, Mn being less than or equal to 0.7, Mo being 0.3-0.8, Si being less than or equal to 1.0, P being less than or equal to 0.02, S being less than or equal to 0.015, and the balance being Fe. The preparation method of the above steel structural material contains the following steps of: 1) weighing each component according to the weight percentage of each component; 2) carrying out vacuum induction melting; 3) casting and remelting electrode bars; 4) remelting electroslag to obtain steel ingots; 5) carrying out homogenization heat treatment; 6) forging wire rod and board strip blank materials; and 7) carrying out finishing, flaw detection and cold machining on the wire rod and board strip blank materials. By the formation of high-toughness low carbon lath-shaped martensite and enhanced means of supplementing molybdenum, copper and other alloy elements, the martensite steel with high strength and toughness, high corrosion resistance and wear resistance is obtained. The preparation method meets requirements such as strong corrosion resistance, excellent abrasion resistance, good machinery processing property, high dimension stability and ferromagnetism.

The present invention relates to a high-strength Mg-Gd-Y-Zn-Mn alloy. The alloy comprises the following alloying elements distributed in the alloy, by weight, 8.2-10.2% of Gd, 5.0-6.0% of Y, 0.5-4.0% of Zn, 0.5-0.8% of Mn, and the balance of Mg and inevitable impurities. The alloy is prepared by adopting the following process: material preparing, vacuum melting and ingot casting, uniformization annealing, extrusion and heat treatment. According to the present invention, Mg, Zn, Gd and Y form a large amount of long period phases in the Mg-Gd-Y-Zn-Mn alloy so as to provide a significant dispersion strengthening effect, and the time effect treatment is adopted to introduce the strengthening effect of the metastable phase; the process is a preparation method for the high-strength deformation Mg alloy, wherein the method integrates solid solution strengthening, precipitation strengthening and deformation strengthening; the method has characteristics of simple process, strong portability, easy operation and low cost; with the method, tensile strength and yield strength of the allay at the room temperature are significantly improved, and difficulty of allay application limitation due to low mechanical property is solved so as to expand the application range of the Mg alloy.

Steel sheet-viscoelastic core laminates are often subject to corrosion in moisture-containing environments. Zinc-based alloys of iron may be beneficially applied to the inner faces of the steel sheets or to both the inner and outer sheet faces. Substantially pure zinc coatings may be applied over the zinc-iron alloys or over an otherwise base outer steel sheet surface. Combinations of such zinc-iron alloy coatings and substantially pure zinc coatings improve the corrosion resistance of the steel sheet-polymer core laminates while supporting weldability and paintability.

The invention discloses a rare earth aluminum alloy wire for thermal spraying, which belongs to the technical field of thermal spraying. The wire contains aluminum, zinc, magnesium and the like, and also contains two or more than two rare earth metal elements, and the total weight of rare earth metal elements accounts for 0.51-5.00% of the total weight of the wire. The invention has the advantages that the processing and manufacturing process is convenient and the product coat cost is moderate; and the metal thermal spraying coating made from the wire has good adhering capability, good physical and mechanical property, good corrosion-resistant property, and moderate construction cost, and is favorable for popularization and application.

The present invention relates to the technical field of providing corrosion resistant coatings or anticorrosion coatings on substrates which are susceptible to corrosion, particularly on metallic substrates, especially of providing chromate-free corrosion resistant (anticorrosion) coatings on such substrates.

The invention relates to a modified montmorillonite/epoxy resin composite material and a preparation method thereof. The composite material comprises the following components by weight: 4%-6% of montmorillonite; 0.4%-1.2% of a silane coupling agent; 20%-30% of polyamide; 30%-60% of epoxy resin; and 25%-40% of n-butyl alcohol. The silane coupling agent is a KH550 silane coupling agent, a KH560 silane coupling agent or a KH570 silane coupling agent. The preparation method includes: subjecting the montmorillonite to inorganic modification, hexadecyl trimethyl ammonium bromide organic modification, and silane coupling agent modification, and then preparing a modified montmorillonite/epoxy resin composite coating. The production process is simple and has less environmental pollution, and the modified composite coating has greatly improved corrosion resistance.

This invention discloses a preparation method for anti-corrosion rare earth magnet material characterizing that it takes the optimized grain-boundary phase design as the starting point on the basis of a dual alloy method to select Nd base alloy with high crystal forming ability as the assist alloy and reduces the temperature of the press mold blank in a quartz container to room temperature from over grain-boundary phase melting point with the water extraction way to get enough cooling rate and guarantee the non-grain-boundary phase, compared with the material of the same composition prepared by ordinary method, the weightlessness of this invented material reduces over 30% after testing the weightlessness of the material by laying it for 96 hours under 121deg.C, 2 atmosphere and 100% humid environment to show the advanced performance of anti-corrosion.

The compoiste permanent mangetic material is composed of the mixed powder of neodymium, iron, boron and the iron base soft magnetic powder as wellas the macromolecule aggloomerant. The formula (weight percent) of the mixed powder and the macromolecule agglomerant are: the mixed powder 95%-98.5%, the macromolecule agglomerant 1.5%-5%. The formula (weight percent) of the mixed powder of neodymium, iron, boron and the iron base soft magentic powder are: neodymium, iron and boron magentic powder 10%-90%, the iron base soft magnetic powder 10%-90%. The manufacturing procedures are as follows. (1) Preparing the iron base soft magnetic powder: melting the iron base material, casting to ingots, quenching and crystallizing, finally ball milling in argon gas atmosphere. (2) Preparing the composite permanent magnetic material: cadding processing by silicane.

The present invention relates to a high-brightness high corrosion resistance high wearability composite plating layer composite whose total thickness is less than 13 micrometers includes dark nickel/nano composite nickel/bright nickel/chrome, and its electroplating method includes the following steps: firstly, plating dark nickel with thickness of 1.5-2.0 micrometers, plating nano composite nickel with thickness of 5-8 micrometers, plating bright nickel with thickness of 3-4 micrometers and plating chrome with thickness of 0.25-0.5 micrometer so as to obtain the invented plating layer composition, in which the nano composite nickel-plated layer contains 3-10% of composite oxide using alpha-Al2O3 as main crystal phase and with grain size of 40-80 nm, and is formed by means of electrodeposition in conventional electrolytic bath.

The invention provides fused-bonded epoxy powder paint with high resistance to cathodic disbanding. The paint comprises the following components in percentage by weight: 50 to 60 percent of novolac epoxy resin, 10 to 13 percent of curing agent, 25 to 32 percent of filler, 0.5 to 1 percent of pigment, 0.5 to 1 percent of benzoin, 0.4 to 1 percent of leveling agent, and 0.5 to 3 percent of toughening agent. The paint provided by the invention has the advantage of improving the heat resistance, boiling resistance, bending resistance, impact resistance and other performance of powder coatings while improving the resistance to cathodic disbanding.

The invention relates to a method for sealing holes of micro arc oxidation film at room temperature. Solution prepared with sodium silicate, nickel salt, solvent and accelerant is adopted as a sealant, after stewing for at least 2 hours, the sealant is adopted to seal the holes of micro arc oxidation film by soaking at room temperature, after sealing holes, the sealant forms an adsorption crystal packing in micro holes on the surface of the micro arc oxidation film so as to achieve hole sealing. The solvent is deionized water, and the ratio of sodium silicate, nickel salt and accelerant is as follows: 5-15 g/L of sodium silicate, 2-8 g/L of nickel salt and 0.1-2 g/L of accelerant. The sodium silicate is sodium metasilicate pentahydrate or sodium metasilicate. The nickel salt is nickel fluoride, nickel acetate or the mixture of the two. The accelerant is boric acid, thiourea, zirconium potassium fluoride or the mixture thereof. The solution of sealant provided by the invention can be used without heating, and the hole sealing can be performed at room temperature, which is easy and simple and has good hole sealing effect without any effect to the hardness of ceramic membrane. Meanwhile, the corrosion resistance of ceramic membrane can be improved.

The invention discloses a preparation method of low-dysprosium corrosion-resistant sintering neodymium iron boron. According to the preparation method, Dy, Co, Al and alloy elements such as Cu, Ga and Nb are sputtered on the surface of airflow grinding powder by utilizing a magnetron sputtering-based powder coating process on the basis of preparing Nd(Pr)-Fe-B alloy powder, crystal boundary modified elements such as Co, Al, Cu, Ga and Nb are introduced while the Dy element is introduced into crystal boundary, and the temperature of the subsequent heat treatment process is reduced, so that the alloyed elements are dispersed properly near the crystal boundary in a sintering process, coercivity is improved, the Dy content is reduced, the corrosion resistance of a magnet is effectively improved, and preparation of the low-dysprosium corrosion-resistant sintering neodymium iron boron is realized.

The invention discloses an aluminium alloy conductor for automotive wires, which has the advantages of high heat resistance, conductivity, tensile strength, extensibility and fatigue resistance, and a manufacturing method thereof. The alloy contains 0.3 to 0.8 weight percent of iron, 0.05 to 0.20 percent of silicon, 0.1 to 0.5 weight percent of magnesium, 0.1 to 0.3 weight percent of copper, 0.001 to 0.04 weight percent of boron, 0.001 to 0.04 weight percent of zirconium, 0.001 to 0.04 weight percent of yttrium, and the balance of aluminium and inevitable impurities, wherein one or two elements, except the aluminium and the inevitable impurities, account for 0.1 to 2.0 weight percent. The manufacturing method comprises the following steps of: adding the iron, silicon, magnesium, copper, boron, zirconium, yttrium and aluminium into a smelting furnace; smelting, and casting and rolling; performing intermediate annealing treatment; drawing into aluminium alloy filaments with the diameterof 0.5mm; and stranding into wire cores, and performing annealing treatment. The conductor prepared by the method has the tensile strength of 210MPa and above, the elongation at break of over 10 percent, the conductivity of over 58 percent, and excellent heat resistance and flexibility.

The invention provides a coating composition for use with metallic substrates that provides desirable levels of adhesion to metal, sandability without the production of harmful dust, corrosion resistance, and recoatability. The coating composition of the invention comprises a polyurethane film-forming component, and a corrosion protection component present in the composition in an amount effective in minimizing corrosion and adhesion loss of the coating at the substrate. A cured film of the coating applied to metallic substrates, previously coated substrates, as well as plastic substrates has improved corrosion resistance following Salt Spray Cabinet exposure.