56results about How to "Reduce corrosion potential" patented technology

The present invention discloses a kind of aluminum alloy foil for heat exchanger of air conditioner, cooler, heater unit, radiator, etc. in automobile and its production process. The aluminum alloy foil is produced with Al, Fe, Si, Mn, Zn, Cu, Mg, Zr and Ti, and through smelting, casting, homogenizing, cutting, milling, heating, rolling, annealing, finish rolling and other steps. The aluminum alloy foil thus produced has no deformation, subsidence and collapse.

The invention discloses an electrogalvanizing method based on a glycine betaine-urea-water deep-eutectic solvent and belongs to the technical field of electroplating. The method includes the steps that firstly, glycine betaine, urea and distilled water are stirred at the constant temperature to obtain a transparent deep-eutectic solvent; then zinc chloride is added into the deep-eutectic solvent for constant temperature stirring to obtain a zinc containing deep-eutectic solvent which serves as electroplating liquid; and a pure zinc board used as an anode and low-carbon steel used as a cathode are immersed into the electroplating liquid for continuous current electroplating. The deep-eutectic solvent prepared from the glycine betaine, urea and water has the characteristics that an electrochemical window is wide, the galvanization process is safe, free of toxicity and environmentally friendly, and the problem of environmental pollution occurring in the processes of borofluoride galvanization, halide galvanization and the like is solved.

The invention discloses a multi-layer material brazing aluminum material with excellent internal and external corrosion performance and a preparation method of the multi-layer material brazing aluminum material. The multi-layer material brazing aluminum material is formed by sequentially stacking brazing layer alloy, first intermediate layer alloy, core layer alloy, second intermediate layer alloyand brazing layer alloy and then carrying out hot rolling compounding; the first intermediate layer alloy consists of the following elements of, in percentage by mass, less than or equal to 0.6% of Si, less than or equal to 0.7% of Fe, less than or equal to 0.2% of Cu, less than or equal to 1.5% of Mn, less than or equal to 0.1% of Mg, 0.8%-5% of Zn and the balance Al; and the second intermediatelayer alloy consists of the following elements of, in percentage by mass, less than or equal to 0.5% of Si, less than or equal to 0.3% of Fe, less than or equal to 0.2% of Cu, less than or equal to 0.1% of Mn, less than or equal to 0.45% of Mg, less than or equal to 0.1% of Zn, less than or equal to 0.1% of Ti and the balance Al. The multi-layer material brazing aluminum material has the beneficial effects that the first intermediate layer contains a certain amount of zinc and has very low corrosion potential, so that the core layer alloy is protected by sacrificing the first intermediate layer; and the second intermediate layer alloy with extremely low zinc content can play a very good role in protecting a low-PH 1.2-1.8 solution environment through an internal test due to the fact thatthe relatively pure components of the 1-series aluminum alloy are adopted, and therefore an excellent anti-corrosion effect is achieved on the cooled medium side.

The invention provides a degradable Zn-Ag series zinc alloy and a preparing method and application thereof. The zinc alloy is composed of Zn, Ag and a microelement. The mass percent of the Zn ranges from 89.85 to 99.4%, the mass percent of the Ag ranges from 0.01 to 10%, and microelement comprises one or multiple of Fe, Mg, Ca, Sr and Li. The mass percent of the microelement ranges from 0.01 to 0.55%. The method comprises the steps of heating metal zinc to be molten after burdening, adding metal silver, performing stirring until the metal silver is molten, adding the microelement, performing stirring, standing and pouring, and obtaining a zinc alloy cast ingot; and performing heat treatment and heat preservation on the zinc alloy cast ingot, and finally performing extrusion forming. The made zinc alloy has the higher strength and ultra-high plasticity, good anti-bacterium effect is achieved, and the alloy can serve as a degradable medical device implant to be applied into the human body to be subjected to non-toxic degradation.

The invention provides a rare earth polishing liquid of organic base corrosive medium, which comprises (by weight percent) cerium dioxide 0.5-5%, triethanolamine 0.05-1.0% and balancing H2O. The polishing liquid can also contain 0.25-1.0% of potassium ferricyanide as the oxidizing agent, or 5-15wt% of hydrogen peroxide.

The invention discloses a method for preparing aluminum part surface zincing powder and a method for coating the aluminum part surface zincing powder. The aluminum part surface zincing powder comprises the following components in percentage by weight: 14.9 to 84.5 percent of zinc powder, 84.9 to 14.5 percent of inert metal oxide powder, 0.1 to 0.5 percent of activating agent and 0.1 to 0.5 percent of auxiliary agent. The coating method of the aluminum part surface zincing powder comprises the following steps of: placing the aluminum part surface zincing powder prepared by the preparation method and an aluminum part to be zinced in the same sealed steel can; heating the steel can; controlling the temperature to 400 +/-10 DEG C; after keeping the temperature for 60 to 180 minutes, cooling to the room temperature; and zincing and coating the surface of the aluminum part. The corrosion resistance of an aluminum plate processed by the method is obviously improved, and particularly the marine atmospheric environment corrosion resistance is greatly improved.

The invention relates to a black chromium plating solution, a composite plating layer and a preparing method thereof. The black chromium plating solution comprises water solutions of the following components of 100-150 g/L of chromic chloride, 55-70 g/L of boric acid, 160-305 g/L of conducting salt, 70-160 g/L of complexing agents, 0.02-0.15 g/L of wetting agents, 0.5-1.5 g/L of ammonium ferrous sulfate and 10-50 g/L of blackening agents, wherein the blackening agents are mixtures of methionine, potassium thiocyanate and aspartic acid. The trivalent black chromium plating layer formed by plating through the black chromium plating solution is in deep black, is strong in uniform covering capacity and can be matched with a bright copper layer, a semi-bright nickel layer, a bright nickel layer, a micro-porous nickel layer and a passivation film layer to enable the obtained composite plating layer to have high abrasion resistance and be in uniformly deep black.

The invention discloses a method for preparing an aluminum-based amorphous layer by jointly adopting hot spraying and electron beam remelting technologies, and relates to the technical field of preparation of an aluminum-based amorphous coating. The method comprises the steps of preparing an Al-Co-Ce alloy, carrying out a gas atomization process on the alloy so as to powder, then utilizing a supersonic speed flame for hot-spraying a substrate surface so as to prepare an Al-Co-Ce alloy protection coating, and finally adopting a high-current pulse electron-beam for carrying out surface modification on the prepared Al-Co-Ce alloy protection coating, wherein the Al-Co-Ce alloy is prepared from 4.0 to 8.0 at percent of Co, 6.0 to 8.0 at percent of Ce and the balance Al. According to the methodfor preparing the aluminum-based amorphous layer by jointly adopting the hot spraying and electron beam remelting technologies provided by the invention, surface modification is carried out on the surface of a hot-spraying coating, so that the amorphous alloy layer with a flat surface and a compact structure is generated, and the corrosion resistance of the hot-spraying coating is improved.

The invention belongs to the field of polishing liquid and in particular relates to polishing slurry for inhibiting galvanic corrosion of a copper-cobalt barrier layer and corrosive pitting of a cobalt surface. The polishing slurry is prepared from the following components in parts by weight: 1 to 20 parts of grinding particles, 0.001 to 5 parts of a cobalt surface protection agent, 0.001 to 5 parts of an azole compound, 0.1 to 6 parts of a complexing agent and 0.01 to 3 parts of an antioxidant; and the pH (Potential of Hydrogen) value of the polishing slurry is 7.0 to 11.0. The polishing slurry provided by the invention can be used for reducing the corrosion potential difference of cobalt and copper, and copper-cobalt galvanic corrosion density, so that the galvanic corrosion of the cobalt, which is used as an anode in a chemical and mechanical polishing process, is inhibited. Meanwhile, the corrosion potential of the copper is not obviously lower than that of the cobalt and galvaniccorrosion occurs at one side of the copper. Furthermore, the slurry also can be used for effectively inhibiting the generation and development of the corrosive pitting of the cobalt surface, and the reliability and yield of devices are improved.

The invention discloses a zinc alloy coating of an LNG (Liquefied Natural Gas) opening-frame vaporizer. The coating is made of a zinc alloy material comprising the following chemical components: 5.3-35.4wt% of Al, 0-6.2wt% of Cu, 0-5.1wt% of Y and the balance of Zn. According to the invention, Zn is used as a matrix, and Al and Cu are used as main alloy elements; Zn is used as the matrix so as to play a favorable protecting role for a cathode; Al can be formed into a compact Al2O3 protective film so as to ensure that the coating has certain seawater corrosion resistance; due to the addition of Cu, the coating is higher in hardness and better in erosion corrosion resistance, and the corrosion resistance of the coating can also be improved. Due to the addition of Y, not only can the corrosion resistance of the coating be improved, but also the forming performance of the material can be improved, so that the material can be more conveniently prepared into the corrosion resistant coating.

The invention belongs to the field of an implanted medical appliance product, and particularly relates to a fast directional biodegradation hemostatic clamp and a preparation method thereof. The outersurface and the side surfaces of the hemostatic clamp are subjected to laser surface modification treatment; the outer surface and the side surfaces of the hemostatic clamp have laser modification layers after the laser surface modification; the degradation speed is higher than that at the inner side; the directional degradation from the outside to the inside can be realized.

A method for protecting the components of the primary system of a boiling water reactor, especially against stress cracking corrosion, includes feeding a reducing agent into the primary coolant in order to reduce the number of substances having a oxidizing effect or in order to modify the electrochemical potential of the component surfaces covered with an oxide layer to negative values. An alcohol that can be oxidized in the conditions of a reactor is fed in as a reducing agent, preferably in a liquid form, into the primary coolant. The component surfaces are provided with a blank coating or a single intrinsic oxide coating.

The invention provides a method and a device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through a low-intensity magnetic field, and belongs to the technical field of denitrification. Under the action of a low-intensity magnetic field, microorganisms are inoculated on an iron-carbon carrier, nitrate-nitrogen-containing inlet water is introduced, iron-carbon micro-electrolysis corrosion hydrogen evolution and iron-carbon micro-electrolysis autotrophic denitrification are carried out, and nitrate-nitrogen-removed outlet water is obtained. Iron-carbon micro-electrolysis autotrophic denitrification is carried out under the condition of a low-intensity magnetic field, the activity of microorganisms and related enzymes can be improved, the corrosion potential of an iron-carbon carrier can be reduced, the iron-carbon micro-electrolysis corrosion hydrogen evolution rate is increased, the precipitation position and the precipitate attribute can be changed through the Lorentz force and the magnetic field gradient force effect, therefore, the formation of an iron-carbon carrier passivation film is relieved, and the nitrate nitrogen removal effect of microorganisms is effectively improved.

The invention discloses a processing technology of an aluminum alloy for a cooling device. The technologies of composition optimization, blank making, extrusion, quenching, stretcher straightening, aging treatment, cleaning and coating are sequentially carried out; and according to a prepared aluminum alloy cooling fin, the room-temperature tensile strength is not smaller than 320 MPa, the yield strength is not smaller than 230 MPa, the postwelding yield strength is not smaller than 120 MPa, corrosion resistance is high, and the antimicrobial property is good.

The invention discloses an Al-Mg alloy material with high intergranular corrosion resistance. The alloy comprises Ru, Mg, Mn, Zn, Ti and Al. According to the alloy, in a corrosive medium, Ru can increase the current density of a cathode reaction, so that an alpha(Al) surface spontaneously generates Al2O3.3H2O with the thickness of 300 nm and a compact, self-repairing high-corrosion-resistance passivation film. The erosion of the corrosive medium to a beta(Al3Mg2) phase is effectively blocked, and the intergranular corrosion resistance of the alloy is greatly improved. By adjusting the proportion of M(Mg) to M(Mn) to M(Zn), a tau(Mg32(Al,Zn)49) phase can be separated out from the alloy, separation of the beta(Al3Mg2) phase is inhibited, the potential difference between a second phase and analuminum matrix is reduced, and the intergranular corrosion resistance of the alloy is further improved.

The invention discloses a preparation technique of aluminum alloy for power equipment in the marine environment. The preparation techniques comprises the steps of composition optimization, homogenizing, squeezing, quenching, drawing, aging, cooling, cleaning, alkali washing, acid washing, oxidation and hydrophobic surface manufacturing. As for aluminum alloy products obtained through the technique, the tensile strength is larger than or equal to 420 MPa, the yield strength is larger than or equal to 320 MPa, the elongation is larger than or equal to 18%, the Brinell Hardness is larger than or equal to 100 HB, the electrical conductivity is larger than or equal to 27 MS/m, the corrosion resistance and weather resistance are good, corrosion damage of high-humidity corrosive saline ions to aluminum alloy workpieces can be effectively resisted, and the production process is stable.