15 results about "Galvanic effect" patented technology

The invention belongs to the field of PCB production, and particularly relates to a production method for controlling galvanic effect generation at a PAD of a PCB, and the production method comprises the following steps: S1, manufacturing design graphic data of the PCB, and designing joints of a circuit and a square PAD and a circular PAD to be teardrop-shaped; s2, cutting the substrate into a specified size according to design graphic data, and cleaning a surface plate; s3, converting a Gerber file in the design graphic data into a film negative, and transferring a circuit pattern to a substrate copper foil coated with photosensitive resin through an exposure machine; s4, removing the unexposed photosensitive resin by using a developing solution; when image data is manufactured and designed, the connecting position of the circuit and the PAD is designed to be in a teardrop shape, after follow-up transfer printing etching, a teardrop-shaped structure is formed at the connecting position of the circuit and the PAD in the conductive circuit, the connecting area between the circuit and a bonding pad is effectively increased, and the risk that the connecting position of the circuit and the PAD is disconnected due to corrosion of a severe environment in follow-up production and use is reduced.

The invention discloses a bump packaging structure and a packaging method. The packaging method comprises the following steps: step 1, sputtering a seed layer on the surface of a wafer; 2, manufacturing a photoresist opening in the surface of the wafer; 3, at least two metal layers are manufactured in the photoresist opening, so that the Pad is connected out; 4, removing the seed layer on the surface of the wafer to enable the salient points to be directly independent, and avoiding short circuit; and step 5, completing coating, grinding and cutting of the metal layer structure on the surface of the salient point, and manufacturing the whole wafer into a single packaging chip. According to the invention, a compact nickel-gold layer can be formed on the surface of the salient point, corrosion of water vapor to copper is prevented, galvanic effect in a chip cutting process is avoided, the reliability passing rate of the chip in a high-humidity environment is improved, and the preparation method is simple, convenient and suitable for industrial popularization and application.

The present application discloses a wear-resistant structure for a laterite nickel ore autoclave, comprising an autoclave body, an insulating sleeve, and a wear-resistant plate. An accommodating cavity is formed in the autoclave body, and a first mounting slot is formed on the inner wall of the accommodating cavity. The insulating sleeve is embedded in the first mounting slot, and a second mounting slot is formed on the insulating sleeve. The wear-resistant plate is embedded in the second mounting slot, wherein the insulating sleeve blocks the flow of electrical charges between the wear-resistant plate and the autoclave body. The insulating sleeve is embedded in the first mounting slot, and the wear-resistant plate is embedded in the second mounting slot, so that the wear-resistant plate can be fixed inside the autoclave body, thereby improving the wear resistance of a stirring area by means of the wear-resistant plate. In addition, since the insulating sleeve blocks the flow of the electrical charges between the wear-resistant plate and the autoclave body, the galvanic effect between the wear-resistant plate and the autoclave body can be prevented, avoiding accelerated corrosion of the autoclave body caused by the galvanic effect from different types of metals, thereby prolonging the service life of the autoclave.

The application discloses a kind of based on the measurement method of geologic hazard body slip surface of induced polarization effect, comprising: drilling N work drill holes in the rear end of potential landslide body to be detected;High polarizability and lower viscosity slurry are injected into work drill hole;Using the werner device with equal electrode distance, apparent polarizability under several first electrode distances along the direction of landslide body is obtained;The distance of electrode is increased, and apparent polarizability under several second electrode distances along the direction of landslide body is repeatedly obtained;Apparent polarizability dataset is formed, and apparent polarizability pseudo-section is drawn according to apparent polarizability dataset;According to apparent polarizability pseudo-section, high polarizability distribution law is analyzed, and preliminary slip surface position is obtained;The apparent polarizability dataset is inverted, and apparent polarizability inversion section is obtained;According to apparent polarizability pseudo-section and apparent polarizability inversion section, the accurate slip surface position is obtained.

The application discloses a kind of based on galvanic critical dimension of multi-metal system galvanic effect evaluation method and device, and it is related to electrochemical corrosion evaluation technical field.Multi-metal system galvanic effect evaluation method includes steps: obtaining the polarization curve and self-corrosion potential of each metal in multi-metal system, determine galvanic anode and galvanic cathode on each lap surface;Calculate the galvanic critical dimension of any two groups of metals in multi-metal system;Compare the size of actual interface distance and combined critical distance, determine the galvanic corrosion form of multi-metal system;If the galvanic of two lap surfaces has no mutual influence, then carry out independent galvanic analysis, if the galvanic of two lap surfaces exists potential competition, then carry out coupling analysis to the galvanic of two lap surfaces.The application fully considers the complex potential coupling, interface interference and mutual influence effect between multi-metals, and improves the accuracy, applicability and scientificity of multi-metal lap joint structure galvanic corrosion evaluation.

The invention discloses a three-layer composite fabric based on gradient moisture conduction and charge dissipation and a preparation method of the three-layer composite fabric, an inner-layer fabric realizes efficient directional transportation of sweat and source inhibition of triboelectric charges through a unique capillary force gradient network of the inner-layer fabric, and a nanofiber membrane provides partitioned antibacterial / antistatic and photo-thermal response capabilities; the outer layer guarantees rapid spreading and evaporation of moisture by means of the hydrophilic and oleophobic surface characteristics of the outer layer, continuous liquid-phase moisture delivery of the inner layer provides stable humidity excitation signals for photothermal conversion of the middle layer, sweat is rapidly removed, the galvanic effect generated by local enrichment of electrolyte is effectively inhibited, and the photothermal conversion efficiency of the middle layer is improved. According to the anti-static fabric, a secondary generation path of static electricity is blocked, a continuous conduction path is formed by microcosmic grooves of the inner-layer fabric and conductive networks of the middle layer and the outer layer, generation inhibition, rapid dissipation and dynamic neutralization of static charges are achieved, and therefore dry and comfortable wearing experience and stable anti-static protection are continuously provided in a complex use environment.

The utility model discloses a PCB electroless silver board welding ring circuit teardrop structure, and relates to the circuit board production field, the teardrop structure is symmetrically arranged between two adjacent welding rings, the two welding rings are connected through a wire, the teardrop structure is arranged on two sides of the wire, the teardrop structure comprises a wire connecting part and a teardrop part, the wire connecting part is connected with the teardrop part, and the teardrop part is connected with the wire connecting part. The tear dripping parts are arranged at the included angle position of the wire and the welding ring, the two ends of each tear dripping part are connected to the wire and the welding ring respectively, the wire connecting part is arranged on one side of the wire in parallel, the two ends of the wire connecting part are connected to the two tear dripping parts respectively, and the outer surfaces of the wire and the tear dripping structure are coated with anti-corrosion layers. And the circuit copper foil is prevented from being corroded by the galvanic effect in the silver melting production process to generate a thin neck phenomenon.

The invention relates to a copper alloy surface micro-etching solution and a preparation method thereof, and belongs to the technical field of micro-etching solutions. The copper alloy surface micro-etching liquid is prepared by taking a self-made supported phosphotungstic heteropolyacid catalyst, glacial acetic acid, a hydrogen peroxide solution, a buffer agent, a stabilizer and a corrosion inhibitor as raw materials, and the copper alloy surface micro-etching liquid is prepared by the following steps: firstly, synthesizing peracetic acid with higher oxidability by using the catalyst, hydrogen peroxide and glacial acetic acid; according to the micro-etching liquid, the copper alloy surface is etched under the weak acidic condition, the conductivity of the micro-etching liquid is further reduced, the purpose of inhibiting the galvanic effect of the copper alloy surface is achieved, in addition, due to the existence of a large number of acetate ions, the content of metal ions in the micro-etching liquid is very low, a pH buffer system exists, and the corrosion resistance of the copper alloy surface is improved. The influence of the overall oxidability of the micro-etching liquid along with the change of the reaction time is small, the etching effect is uniform, the concentration of a single component can be reduced through a hydrogen peroxide / peracetic acid compound system, and damage to a base material due to the too high single component is avoided.

The utility model discloses a laterite-nickel ore autoclave wear-resistant structure which comprises an autoclave body, an insulating sleeve and a wear-resistant plate, an accommodating cavity is formed in the autoclave body, and a first mounting groove is formed in the inner wall of the accommodating cavity. The insulation sleeve is embedded in the first installation groove, and the insulation sleeve is provided with a second installation groove. The wear-resisting plate is embedded in the second mounting groove, and the insulating sleeve prevents charge flow between the wear-resisting plate and the kettle body. The insulating sleeve is embedded in the first mounting groove, and the wear-resisting plate is embedded in the second mounting groove, so that the wear-resisting plate can be fixed in the kettle body, and the wear resistance of a stirring area can be improved by utilizing the wear-resisting plate; meanwhile, as the insulation sleeve blocks the charge flow between the wear-resisting plate and the kettle body, the primary battery effect between the wear-resisting plate and the kettle body can be blocked, the corrosion speed of the kettle body is prevented from being accelerated by the primary battery effect caused by different types of metal, and the service life of the high-pressure kettle is prolonged.

The invention discloses a method for improving the electrochemical performance of a Zn-Al-Mg series alloy coating through heat treatment, and relates to the technical field of metal surface treatment, the Zn-Al-Mg series coating becomes a new-generation protective coating due to the synergistic effect of Mg and Al, but when the content of Mg is larger than 3 wt%, an Mg-rich phase is prone to coarsening and segregation, the local galvanic effect is intensified, and the corrosion resistance is weakened; although trace Si is added, grains can be refined and Mg segregation can be inhibited, but the problems of aging sensitivity and influence on a subsequent forming process (such as stamping) exist, the trace Si is added and controllable heat treatment is combined, Mg-rich phase coarsening and intercrystalline segregation are inhibited, uniform distribution of a second phase is realized, and the electrochemical performance is remarkably improved; according to the method, the corrosion resistance is improved and the plating layer is thinned while the advantage of high-Mg-content cathode protection is kept, and the comprehensive economic and environment-friendly benefits are remarkable.

The application discloses a detection method for galvanic effect between sulfide minerals in ores, comprising the following steps: S1, making a target ore slice and calibrating a three-dimensional coordinate system; S2, polishing and grinding the target ore slice to obtain mineral element distribution information in the target mineral slice; S3, determining the coordinates of the target mineral according to the mineral element distribution information; S4, making a mineral electrode based on the target ore slice; S5, polishing and grinding the mineral electrode, and then detecting the electrochemical behavior of sulfide minerals in the mineral electrode according to the coordinates of the target mineral to obtain the galvanic effect information between the sulfide minerals. The technical scheme disclosed by the application can accurately identify the distribution of target sulfide minerals in ores, realize electrochemical detection of the unoxidized surface of the sulfide minerals, reveal and control the electrochemical reaction in sulfide mineral grinding, and further improve the mineral flotation separation effect, so that the application has great application prospect.

The application discloses a microcalorimetric testing method for studying sulfide galvanic effect, which comprises the following steps: (1) preparation before testing; (2) testing by using a microcalorimetric testing controller. The application can understand the dissolution characteristics between different sulfides and collectors and the influence of the existence of galvanic effect between two sulfides on the dissolution characteristics between mixed minerals and collectors, and provides a thermodynamic basis for the flotation separation of sulfides.

A memory structure is provided that avoids high resistance due to galvanic effects. High resistance is reduced and / or eliminated by providing a T-shaped bottom electrode configuration (i.e., a single piece) of uniform structure. The T-shaped bottom electrode structure includes a narrow base portion and a wider leg portion. The leg portion of the T-shaped bottom electrode structure has a planar topmost surface with which the MTJ pillar forms an interface.

The application provides a magnesium alloy and a preparation method thereof, a magnesium product and a preparation method thereof. According to the mass percentage of the magnesium alloy, the magnesium alloy comprises the following components: 4-5% of Al, 1-4% of Ca, 1-4% of Y, 0.1-0.3% of Nd, 0.1-0.3% of Mn, and the balance of inevitable impurities and Mg elements. The magnesium alloy satisfies the following condition: 0.70A+1.18D>0.50E+0.01G+0.07I. The magnesium alloy provided by the application is designed by multi-element alloying and the proportion of each element is controlled, so that the micro-galvanic effect in the alloy and the macro-galvanic corrosion tendency when the alloy contacts with dissimilar metals are significantly reduced, and meanwhile, good die casting process performance is maintained.

The invention relates to a method for removing pollutants in water by reinforcing H2O2 activation by utilizing a Galvanic effect among minerals, and belongs to the technical field of water treatment and environmental catalysis. According to the method, iron-sulfur minerals (such as maquinol FeS or pyrrhotite Fe1-xS) with low electrochemical potential and metal sulfide minerals (such as pyrite FeS2, copper blue CuS, chalcocite Cu2S, cobalt sulfide CoS or nickel sulfide NiS) with high electrochemical potential are coupled, the Galvanic effect between the minerals is excited, efficient activation of H2O2 is achieved, and hydroxyl free radicals are generated to oxidize and degrade organic pollutants. Compared with the prior art, the method has the advantages that the natural metal sulfide is used as the catalyst, an efficient reaction system can be constructed through simple and convenient physical coupling, additional energy consumption or a complex synthesis process is not needed, the utilization efficiency of H2O2 and the pollutant removal rate are remarkably improved, and the method has the advantages of being wide in resource, low in cost, high in reusability and the like; the method is suitable for treatment scenes of multiple types of organic wastewater.