13 results about "Chemical attack" patented technology

The invention relates to the technical field of etching solutions, and particularly discloses an etching solution for inhibiting etching of metallic titanium and application of the etching solution. The etching solution contains hydrofluoric acid, ammonium fluoride, an additive 1 and an additive 2; wherein the additive 1 is a fluorine capture type inhibitor, and the additive 2 is a surface adsorption type organic protective agent. The etching solution can effectively inhibit the corrosion of a titanium layer while keeping the high etching rate of silicon oxide, obviously improves the etching selection ratio of silicon oxide to titanium, has lower surface tension and higher uniformity, and is suitable for a wet etching scene with a complex structure. The additive 1 captures free fluorine ions through complexation or precipitation, the activity of the fluorine ions is reduced, and therefore the chemical attack on the titanium surface is reduced; and the additive 2 can form a transient adsorption protective film on the titanium surface to further delay the dissolution of titanium. The synergistic effect of the two additives can effectively inhibit titanium corrosion and maintain high etching efficiency.

This invention discloses a method for inspecting horizontal lines for foreign matter contamination, comprising three steps: PCB board fabrication, PCB horizontal line production, and horizontal line inspection. The horizontal line inspection uses a solder resist ink exposure and development method to create a loop-shaped circuit. AOI (Automated Optical Inspection) equipment is used to compare the inspected board with the design drawings for analysis. The ink is resistant to chemical attacks and recyclable. By using a solder resist ink exposure and development method to create a loop-shaped circuit (copper is replaced by ink), and because the ink is resistant to chemical attacks and recyclable, AOI equipment is used to compare the inspected board with the design drawings, replacing manual inspection. If there is a discrepancy with the design drawings, it indicates the presence of foreign matter between the lines on the inspected board, requiring further inspection and maintenance of the horizontal lines. If there is a match with the design drawings, it indicates the absence of foreign matter between the lines on the inspected board.

A method of making a ceramic matrix composite (CMC) having an increased carbon content that may show improved resistance to chemical attack from molten silicon is described. The method includes depositing one or more matrix layers comprising boron nitride, silicon nitride, pyrolytic carbon, and / or silicon carbide on a fiber preform comprising one or more silicon carbide fibers. After depositing the matrix layer, the fiber preform is dipped into a coating solution comprising a polymer to deposit a polymeric layer on the matrix layer. After dip coating, the fiber preform is infiltrated with a slurry comprising ceramic particles and / or carbon particles to form a green body; after forming the green body, the polymeric layer is pyrolyzed to form a carbon-containing coating on the matrix layer; and the green body is then infiltrated with a melt comprising silicon or silicon alloy. Upon cooling the melt, a dense CMC formed may be obtained.

An ophthalmic lens comprising an embedded functional wafer coated with a coating layer on one or both sides, and a method for manufacturing the same. The coating layer may provide adhesion between the functional wafer and the surrounding resin used to form the lens. The coating layer may also protect the functional wafer from degradation during manufacturing, such as chemical attack during thermoforming or exposure to heat. The coating layer may be applied to a flat functional sheet and then molded to a curvature matching the lens, or the coating layer may be applied to a functional wafer that is already curved. The coating layer may comprise a variety of compositions known to provide adhesion, protection from heat, and / or protection from chemicals.

Described herein, are methods for providing a protective coating to a storage container for storing nuclear material, the method comprising depositing nickel particles on at least one surface of the substrate to produce the protective coating, wherein the nickel particles are deposited by cold spraying a composition comprising nickel particles and a carrier gas comprising nitrogen. In one aspect, the carrier gas consists essentially or consists only of nitrogen. The methods do not require pretreatment or modification of the nickel particles prior to cold spraying, which makes the methods described herein economically practical. The coatings produced by the methods described herein possess several advantageous properties including, but not limited to, high adhesion strength to the storage system and low porosity. The coatings produced by the methods described herein are effective against chemical attack such as, for example, CISCC.

A substrate with a marking consisting of microscopic metallurgical structures (3) randomly arranged on the substrate's surface, each exhibiting at least one physical and / or chemical property that differs from the rest of the substrate. At least one structure comprises an element where exposure to radiation, an external electric or magnetic field, chemical attack, or mechanical, thermal, or electrical stress causes a temporary or permanent change in at least one physical or chemical property of the structure. The structures may consist of a first alloy (31) and a second alloy (32) that differ from each other. Alloy 31 permanently and stably changes color upon exposure to laser radiation, while alloy 32 exhibits high reflectivity and is therefore stable against laser exposure.

This invention discloses a copper rod straightening device and method, belonging to the field of copper rod straightening technology. The invention employs 180℃-200℃ medium-frequency induction preheating to reduce the yield strength of the copper rod, achieving gentle hot straightening and eliminating the indentation and micro-crack problems associated with cold straightening. A combination of spray precooling and immersion slow cooling is used, with the heat transfer intensity of spray cooling falling between that of air cooling and water immersion; it acts as an excellent precooling buffer zone. First, the surface temperature of the copper rod is gently reduced to 60℃-70℃, initially narrowing the internal and external temperature difference. Then, it enters a water tank in a relatively stable state for constant and gentle cooling at a water temperature of 40℃-50℃. The stable water temperature means there are no drastic phase change disturbances, and the water quality is clear and stable. In this environment, the copper rod is cooled quietly without suffering any chemical attack.

The present application relates to the technical field of polymer compound, and discloses a kind of anti-ultraviolet, corrosion-resistant and low-temperature resistant anti-freezing geotextile material composition, comprising: polypropylene matrix, small molecule functional additive and a macromolecular anchoring body, one end of the anchoring body is physically entangled with the matrix polymer, and the other end of the anchoring body is combined with the functional additive through a sacrificial linking group, the linking group maintains stable anchoring under normal conditions, and is selectively broken when subjected to acute chemical attack, realizing on-demand release of the functional additive, and the present application solves the inherent contradiction between the migration and persistence of the functional additive through the synergistic effect of macromolecular anchoring and sacrificial linking group.

The present invention provides an electrochemical device (1b) for use in an electrochemical apparatus, such as in an electrolytic cell. The device (1b) comprises an electrode (10), a conduit (20) and an interface layer (90). The electrode (10) has a first part (12) for immersion in an electrolyte (40), a second part (14) for making electrical contact with a current-carrying conductor (30c), and a third part (16) between the first and second parts (12, 14) for making thermal contact with a heat transfer fluid (HTF). The conduit (20) is arranged to bring the heat transfer fluid (HTF) into thermal contact with the third part (16) of the electrode (10) via the interface layer (90), which is between and in thermal contact with both the third part (16) of the electrode (10) and an interior (22) of the conduit (20). The interface layer (90), which is made of a thermally conducting and electrically insulating material, electrically isolates the electrode (10) from the HTF in case the HTF is electrically conducting, and also protects the electrode (10) against chemical attack by the HTF. The electrode (10) is made of carbon, which has reduced electrical resistivity and thermal conductivity at temperatures above ambient. Therefore, if the third part (16) of the electrode (10) is heated by means of the HTF, its electrical resistivity and thermal conductivity are reduced. The former enables more efficient flow of electrical current between the first and second parts (14, 16) of the electrode and therefore reduces the total internal resistance of any electrochemical apparatus in which the electrochemical device (1a) is used. The latter reduces the flow of heat between the first and second parts (14, 16) of the electrode (10) and therefore helps to prevent heat loss from such an electrochemical apparatus via the electrode (10) to the current-carrying conductor (30c). Both effects make the electrochemical apparatus more energy efficient. The device may also be used to inject waste heat from another process, such as from an exothermic chemical reaction, into the electrochemical apparatus. This reduces the electrical power consumption of the electrochemical apparatus and also makes the combination of the electrochemical apparatus with the other process supplying the heat more energy efficient overall. The invention also provides electrolytic cells comprising such an electrochemical device, methods of operating such electrolytic cells, and apparatuses comprising such cells. The invention is particularly suited to producing Group 1 and Group 2 metals by electrolysis with increased energy efficiency.

The present invention provides an electrochemical device (1b) for use in an electrochemical apparatus, such as in an electrolytic cell. The device (1b) comprises an electrode (10), a conduit (20) and an interface layer (90). The electrode (10) has a first part (12) for immersion in an electrolyte (40), a second part (14) for making electrical contact with a current-carrying conductor (30c), and a third part (16) between the first and second parts (12, 14) for making thermal contact with a heat transfer fluid (HTF). The conduit (20) is arranged to bring the heat transfer fluid (HTF) into thermal contact with the third part (16) of the electrode (10) via the interface layer (90), which is between and in thermal contact with both the third part (16) of the electrode (10) and an interior (22) of the conduit (20). The interface layer (90), which is made of a thermally conducting and electrically insulating material, electrically isolates the electrode (10) from the HTF in case the HTF is electrically conducting, and also protects the electrode (10) against chemical attack by the HTF. The electrode (10) is made of carbon, which has reduced electrical resistivity and thermal conductivity at temperatures above ambient. Therefore, if the third part (16) of the electrode (10) is heated by means of the HTF, its electrical resistivity and thermal conductivity are reduced. The former enables more efficient flow of electrical current between the first and second parts (14, 16) of the electrode and therefore reduces the total internal resistance of any electrochemical apparatus in which the electrochemical device (1a) is used. The latter reduces the flow of heat between the first and second parts (14, 16) of the electrode (10) and therefore helps to prevent heat loss from such an electrochemical apparatus via the electrode (10) to the current-carrying conductor (30c). Both effects make the electrochemical apparatus more energy efficient. The device may also be used to inject waste heat from another process, such as from an exothermic chemical reaction, into the electrochemical apparatus. This reduces the electrical power consumption of the electrochemical apparatus and also makes the combination of the electrochemical apparatus with the other process supplying the heat more energy efficient overall. The invention also provides electrolytic cells comprising such an electrochemical device, methods of operating such electrolytic cells, and apparatuses comprising such cells. The invention is particularly suited to producing Group 1 and Group 2 metals by electrolysis with increased energy efficiency.

The utility model relates to the technical field of electronic information transmission, and disclose a kind of high-strength signal line with splicing terminal, including splicing terminal base, splicing terminal outer frame, terminal interface, signal line shell and internal various structural components, when installing, splicing terminal base is fixed with outside through connecting hole, splicing terminal mounting groove is used to accurately install splicing terminal outer frame, ensure overall stability, its locking structure can effectively prevent connection loosening, guarantee the continuity of signal transmission, terminal connection structure can stably connect signal line and external equipment, realize signal import, signal line shell inside, corrosion-resistant layer can resist chemical attack, prolong service life, shielding layer blocks electromagnetic interference, ensure signal purity, filling layer enhances structural stability and compression resistance, insulation layer isolates signal line, prevent signal leakage and short circuit, auxiliary wire auxiliary signal transmission, balanced current, the signal line of center is responsible for core signal transmission.

An ophthalmic lens comprising an embedded functional wafer coated on one or both sides with a coating; and a method for manufacturing the lens. The coating may provide adhesion between the functional wafer and the surrounding resin used to form the lens. The coating may also protect the functional wafer from degradation during fabrication, such as degradation due to chemical erosion or heat during thermoforming. The coating may be first applied to a flat functional sheet and then shaped to a curvature matching the lens, or the coating may be applied to a curved functional wafer. The coatings may include various compositions known to provide adhesion, heat resistant protection, and / or protection against chemicals.

The invention relates to the technical field of building materials, and particularly discloses a corrosion-resistant cement-based material capable of resisting chemical corrosion and permeation, a modified functional component with a three-layer structure is constructed through a dipping-self-assembly-spraying process, and an outer organic silicon hydrophobic layer effectively solves the problem that under mixing and stirring in a construction strong shear type mixer truck, the corrosion-resistant cement-based material has good corrosion resistance and corrosion resistance. According to the present invention, the problem that the active component, especially the sodium nitrite component, is easy to lose is solved, the pore is blocked during the production process, the active component loss is prevented, the intermediate layer reduced graphene oxide (rGO) significantly prolongs the permeation path of the corrosion medium by virtue of the nano-scale physical barrier, and the inner layer hollow floating bead carrier enables the corrosion inhibitor to be slowly released so as to improve the corrosion resistance of the corrosion inhibitor; according to the present invention, the material can repair the steel bar passivation film for a long time and inhibit and resist electrochemical corrosion for a long time, the material maintains the high strength while the chloride ion diffusion coefficient is substantially reduced to 0.26-0.30 * 10 <-12 > m < 2 > / s, and through the synergistic effect of the components, the service life of the building structure of the chemical industry wastewater treatment system in the highly corrosive environment and other extremely severe environments is prolonged.