52 results about "Electrolytic corrosion" patented technology

The application provides a flat POGO PIN female head connector, which comprises a stainless steel back shell, a plastic front cover and a plastic upper cover arranged at the lower end and the upper end of the front side of the stainless steel back shell respectively, three upper stretch terminals equidistantly arranged on the plastic upper cover, three lower stretch terminals equidistantly arranged on the plastic front cover, and a plastic body integrally injection molded on the upper stretch terminals and the lower stretch terminals; the surface of the upper stretch terminals is sequentially plated with a nickel base layer, a palladium-nickel alloy layer and a gold layer, the surface of the contact area of the lower stretch terminals is sequentially plated with a nickel base layer, a gold layer, a platinum alloy layer, a palladium-nickel alloy layer and a platinum alloy layer to form an anti-electrolytic corrosion plating layer; the end of the upper stretch terminal is provided with a cantilever, and the ends of the three cantilevers are stacked and riveted with a flat plate part; and the front side of the plastic front cover is a flat surface. The flat POGO PIN female head connector realizes quick mutual matching, high-reliability power supply and signal transmission.

The invention relates to a pretreatment process for accurate measurement of a metal element of a cooling water system through an electrochemical corrosion weight loss method and application of the pretreatment process, and the pretreatment process comprises the following steps: S1, placing a sample in flowing distilled water, and carrying out mechanical cleaning by using a banister brush; s2, vertically immersing the sample into an acid solution for a set time, wherein the set time is determined according to the material of the sample; and S3, washing the surface of the sample by using distilled water and alcohol in sequence, drying the sample, cooling to room temperature, and weighing. Compared with the prior art, system errors caused by product residues, film layer differences or excessive acid pickling can be remarkably reduced, and weight loss data are closer to the real electrolytic corrosion amount.

This disclosure provides an electrolytic corrosion method for martensitic structures in FeMnSi alloys, relating to the field of materials processing technology. The method includes: pretreatment operations such as grinding and polishing the FeMnSi alloy; mixing sodium hydroxide, sulfuric acid, and water to obtain an electrolyte for electrolytic corrosion; placing the pretreated FeMnSi alloy as the anode and a stainless steel plate as the cathode in an electrolytic cell containing the electrolyte to perform the electrolytic corrosion process; after the electrolytic corrosion process, removing the FeMnSi alloy, cleaning, and drying it. This disclosure can obtain a well-defined microstructure, meeting the needs of microscopic observation and analysis.

The invention discloses an austenite grain size display method of Cr-Mo-V series hot work die steel, and belongs to the technical field of metal material metallographic inspection. The austenite grain size display method of the Cr-Mo-V series hot work die steel is provided for solving the problem that grains of the Cr-Mo-V series hot work die steel in a spheroidizing annealing state are difficult to clearly and completely display, and comprises the steps that low-temperature austenitizing treatment is conducted; performing high-temperature tempering treatment; grinding, mechanical polishing, electrolytic corrosion and light polishing are carried out; and gradient circulation treatment is conducted, and the electrolytic corrosion voltage, the electrolytic corrosion time and the light polishing time are controlled to be gradually reduced. According to the method, the oxalic acid aqueous solution is adopted for electrolytic corrosion, the contrast difference between the grain boundary and the matrix is strengthened through the stepped circulating electrolytic corrosion and light polishing method, the austenite grain boundary is displayed more clearly, the clear and high-contrast grain boundary morphology is obtained, and accurate grain size rating is facilitated.

A fuel cell includes an anode separator and a cathode separator each including a coating on its surface. Each of the anode and cathode separators includes: a body; a coolant manifold that is an opening in the body and that is configured to allow a coolant to flow therethrough; an intra-cell sealing portion that provides a seal between the anode and cathode separators within the fuel cell and that is provided by the body being bonded to the insulating sheet so as to surround the coolant manifold; and a sacrificial electrolytic corrosion portion disposed between the coolant manifold and the intra-cell sealing portion and including a plurality of exposed portions where a base material is exposed without being covered with the coating. The sacrificial electrolytic corrosion portion includes at least one of the exposed portions on a straight line connecting the coolant manifold and the intra-cell sealing portion.

The invention provides silicone rubber for a dry-type transformer and the dry-type transformer. The silicon rubber comprises raw silicon rubber, and fumed silica, a heat-conducting filler, a flame-retardant filler, a coupling agent and a vulcanizing agent which are uniformly dispersed in the raw silicon rubber, wherein the raw silicone rubber is methyl vinyl silicone rubber, the heat-conducting filler is magnesium oxide, and the flame-retardant filler is aluminum hydroxide; the particle size of the magnesium oxide is 1-2 mu m and / or 5-10 mu m, the particle size of the aluminum hydroxide is 1-2 mu m and / or 5-10 mu m, the particle size of one of the magnesium oxide and the aluminum hydroxide is at least 1-2 mu m, and the particle size of the other one of the magnesium oxide and the aluminum hydroxide is at least 5-10 mu m; the silicon rubber comprises the following components in parts by weight: 100 parts of silicon rubber, 25-40 parts of fumed silica, 50-150 parts of magnesium oxide, 50-150 parts of aluminum hydroxide, 5-15 parts of a coupling agent and 1-2 parts of a vulcanizing agent. The silicone rubber disclosed by the invention has excellent heat resistance, heat conduction, flame retardance, tracking resistance and electric erosion resistance.

The invention discloses a method for detecting residual stress on the surface of a stainless steel wire. The method specifically comprises the following steps: S1, preparing an operation tool; s2, pretreating the stainless steel wire; s3, the stainless steel wires are subjected to electrolytic corrosion; s4, recording data and detecting the surface residual stress value of the stainless steel wire; corrosion is accelerated through electrochemical corrosion, the effective corrosion effect is achieved, the stainless steel wire with the uniform surface corrosion is obtained, and the surface residual stress level of the stainless steel wire is quantitatively analyzed.

This invention relates to the field of electronic connectors and circuit protection technology, and discloses a protection method to prevent poor contact caused by metal electrolysis in spring probe connectors. The method includes a main control chip that sends a microsecond-level detection signal to the connector for monitoring. The signal pulse width is less than the electrochemical polarization establishment time threshold, and charge discharge is used to suppress the electrolytic reaction. After detecting liquid conduction, the graphene heating module is controlled to operate at a constant temperature, and the physical drying time is determined using the dynamic voltage division principle of thermal impedance. Heating is then maintained for a preset time to remove microscopic residual moisture. Finally, a cold-state insulation re-inspection is performed. After the connector naturally cools to ambient temperature, the insulation impedance is tested again, and power is restored only when the cold-state impedance meets the recovery standard. This invention avoids electrolytic corrosion caused by the monitoring process and effectively eliminates misjudgments caused by high-temperature false drying and salt moisture return, ensuring the electrical safety of the connector after recovery.

The invention relates to the technical field of underwater radio frequency connection, and discloses a pressure-resistant water-sealing radio frequency connector, which comprises a shell and a displacement plate, stroke sleeves are arranged on the two sides of the shell, water-sealing stroke plates are movably mounted in the stroke sleeves, a connecting plug is fixedly mounted in the center of each water-sealing stroke plate, and the displacement plate is fixedly mounted in the connecting plug. A connecting socket is arranged in the center of the displacement plate, sliding holes are formed in the positions, located on the two sides of the connecting socket, of the front face of the displacement plate, the sliding holes are in sliding fit with the sliding rods, and the axis of the connecting plug and the axis of the connecting socket are located on the same center line. The surface of the joint of the connecting plug and the connecting socket adopts an electrolytic corrosion prevention treatment mode, and an anti-corrosion coating adopts an anti-corrosion coating structure formed by electroplating rhodium ruthenium, platinum and palladium nickel, so that the connecting plug and the connecting socket can be prevented from being underwater and in a humid environment; and the problem that the data transmission quality is influenced by the damage of the structures of the connecting plug and the connecting socket caused by electrolytic corrosion is solved, and the reliability of the device is improved.

When attaching the anti-corrosion component to the raceway, the core metal prevents the covering component from getting caught between it and the raceway. [Solution] The corrosion-resistant bearing 10 includes an inner ring 11, an outer ring 12, a plurality of rolling elements, and an annular corrosion-resistant member 15 attached to one of the raceway rings, the inner ring 11 or the outer ring 12, and covering at least the cylindrical circumferential surface of the raceway ring. The corrosion-resistant member 15 includes a core metal 20 fitted into the raceway ring and an insulating covering member 30 that covers the first surface 21 of the core metal 20 on the mating member side. The core metal 20 has a second surface 22 opposite to the first surface 21, which has a press-fit surface 23 that is in close contact with the axial center of the circumferential surface of the raceway ring, and a non-press-fit surface 24 that is located axially first to the press-fit surface 23 and does not contact the circumferential surface of the raceway ring. At least the press-fit surface 23 is an exposed surface and is not covered by the covering member 30.

The present invention provides an energizing unit that can stably maintain its electrolytic corrosion prevention effect over a long period of time and can be easily assembled, as well as a bearing unit to which this energizing unit is applied. [Solution] The current-carrying unit 1 comprises a conductive annular outer ring portion 3, a retainer 4 attached to the outer ring portion 3, a conductive current-carrying member 5 held radially movable by the retainer 4 and protruding radially inward from the outer ring portion 3, and a radially elastic member 6 that biases the current-carrying member 5 radially inward, wherein the current-carrying member 5 has a displacement restricting portion 21 formed thereon that restricts its radially inward displacement relative to the retainer 4 to within a predetermined range, and the bearing unit A comprises the above-mentioned current-carrying unit 1 and a bearing 2 having an outer ring 8, an inner ring 9 arranged on the inner diameter side of the outer ring 8, and rolling elements 10 provided between the outer ring 8 and the inner ring 9.

The present application relates to a kind of nuclear power equipment with TP439 welded tube organization and grain boundary display method and application, the organization and grain boundary display method includes the following steps: preparation of electrolyte, sample preparation, electrolytic corrosion;The electrolyte is hydrochloric acid-nitric acid mixed aqueous solution, according to volume ratio, the hydrochloric acid: the nitric acid is 10:1;The sample is from nuclear power equipment with TP439 welded tube;The electrolytic corrosion includes the following steps: electrolyte is poured into electrolytic cell, with the sample as anode, stainless steel plate as cathode, adjust electrolytic parameter, electrolytic reaction, after electrolytic reaction, sample is washed with water, dry;The present application uses specific volume ratio of hydrochloric acid-nitric acid mixed aqueous solution as electrolyte, and combines with the electrolytic parameter of accurate control, carries out electrolytic corrosion to TP439 welded tube sample, to realize the clear, non false appearance display of base material grain boundary, weld columnar crystal and heat affected zone organization.

The invention provides a nickel-based cast superalloy metallographic etchant and a corrosion method, belongs to the technical field of metallographic corrosion, and solves the technical problem of metallographic corrosion of nickel-based cast superalloy. The corrosive liquid provided by the invention comprises ammonium sulfate, citric acid and distilled water, the components have no strong corrosivity, the corrosive liquid is safe to operators and environment, and the preparation cost is low. When the corrosive liquid is used for electrolytic corrosion of a sample, a clear and uniform tissue image of the sample can be obtained, and tissue display is clear. According to the invention, the corrosion safety of the metallographic specimen can be ensured, and the display quality of the structure can be improved. The display method of the nickel-based cast superalloy is widened, and safety detection of the texture state and the surface coating quality of a nickel-based superalloy product is achieved.

The application provides a method for improving the bonding force of a neodymium iron boron deposition layer based on a reinforced ion exchange deposition technology, and belongs to the technical field of rare earth permanent magnet material preparation. The method comprises the following steps: neodymium iron boron magnet cleaning pretreatment, removing contaminants and metal oxides on the surface of the magnet; activating the neodymium iron boron magnet by acid corrosion to obtain a pretreated magnet with a rough surface; soaking the pretreated magnet in an electrolyte and connecting the magnet to a negative electrode; and performing ion exchange deposition on the surface of the magnet to be deposited by applying a pulse variable frequency electric field on the surface of the magnet to prepare a deposition layer; wherein, the surface of the magnet is first modified by micro-electrolysis, and then the ion exchange deposition is performed by applying a variable frequency electric field. In the initial stage, the surface of the magnet is continuously subjected to micro-electrolytic corrosion by a stable current to regulate the interface state and then realize surface modification, which is beneficial to the effective bonding of the deposition layer formed by the subsequent ion exchange deposition.

The application discloses an electric corrosion protection ring structure, and belongs to the field of electrically conductive ring structure design. The ring body is configured in a ring shape; a plurality of electrically conductive fibers are arranged in a ring shape on the inner wall of the ring body in the circumferential direction of the ring body; a sleeve is used for sleeving the electrically conductive fibers; wherein the extending part of the inner wall of the ring body extends in the direction of the central axis, and the extending part extends along the circumferential direction of the ring body to form a protection ring. The application has the beneficial effect of providing an electric corrosion protection ring structure capable of preventing oil and water.

The invention discloses an original austenite grain boundary display method for steel for the high-pressure end of a steam turbine rotor, and belongs to the technical field of metallographic detection. Carrying out surface treatment on the to-be-detected steel sample to obtain a metallographic sample without macroscopic scratches on the surface; carrying out electrolytic corrosion and washing on the metallographic specimen, and carrying out metallographic observation; wherein the electrolyte is a mixed solution of phosphoric acid and sulfuric acid, the electrolysis parameter is 14-16 V direct current voltage, and electrolytic corrosion is carried out for 50-70 s. Controllable and selective corrosion is realized by utilizing the customized acidic electrolyte under the optimized electrochemical condition and utilizing the microscopic difference between the original austenite grain boundary and the surrounding bainite matrix in chemical activity, so that the grain boundary network which is crucial to the material performance is disclosed safely and efficiently.

To suppress electrolytic corrosion of a rolling bearing without performing insert molding of resin to a bearing ring.SOLUTION: A resin part 50 for covering an outer peripheral surface 12 as a peripheral surface on the bearing outside of the bearing ring 10 is formed of a pair of annular members 51 and 52. The annular members 51 and 52 are welded to each other.SELECTED DRAWING: Figure 1

The application relates to the technical field of underwater radio frequency connection, and discloses a pressure-resistant water-tight radio frequency connector which comprises a shell and a displacement plate, both sides of the shell are provided with stroke sleeves, water-tight stroke plates are movably arranged in the stroke sleeves, connecting plugs are fixedly arranged at the center positions of the water-tight stroke plates, connecting sockets are arranged at the center positions of the displacement plate, sliding holes are arranged on the front surface of the displacement plate at positions on both sides of the connecting sockets, the sliding holes are in sliding connection with sliding rods, the axis of the connecting plug and the axis of the connecting socket are located on the same center line, the surface of the connecting position of the connecting plug and the connecting socket is treated by adopting an anti-electrolytic corrosion method, the anti-corrosion plating layer is composed of rhodium ruthenium, platinum gold and palladium nickel, the anti-corrosion plating layer structure can avoid the problems that the connecting plug and the connecting socket are damaged due to electrolytic corrosion caused by being located underwater and being in a humid environment, data transmission quality is affected, and the reliability of the device is improved.

Provided is a rolling bearing capable of suppressing ridge marks caused by electrolytic corrosion. Rolling bearings 6, 7 are incorporated in an inverter-controlled motor 1, have an inner ring, an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring, and are lubricated by a lubricant. The lubricant contains a base oil having a relative dielectric constant higher than 2.5 and a phosphorus-based additive. The base oil is an ester oil, the phosphorus-based additive is an aliphatic phosphoric acid ester having a linear or branched alkyl group, the aliphatic phosphoric acid ester has three alkyl groups, and each of the alkyl groups has 2‒8 carbon atoms.

The utility model relates to the field of stainless steel microcosmic detection, and particularly discloses a hot inlay metallographic sample suitable for a contact type electrode electrolytic polishing instrument, which is used for preparing an inlay type electrolytic corrosion or electrolytic polishing section sample and consists of a single-sided cohesive copper foil, a polyvinyl chloride insulating tape, a hot inlay material and a stainless steel sample. The manufacturing process is simple, the structure enables the hot inlay material side of the stainless steel sample and the stainless steel sample to be in a conductive state, the single-face cohesive copper foil is connected with an anode of a Lectropol-5 electrolytic polishing instrument, the insulating tape protects the connecting position of the stainless steel sample and the copper foil, and the stainless steel sample is prevented from being damaged. The conductivity and the current density uniformity are greatly improved, and the stability is extremely high.

An electrolytic corrosion prevention member for a rolling bearing, the electrolytic corrosion prevention member being mounted on a rolling bearing unit including the rolling bearing in which one bearing ring is a fixed ring and the other bearing ring is a rotating ring in order to prevent electrolytic corrosion of the rolling bearing, the electrolytic corrosion prevention member includes: a spring plate including an annular portion and a plurality of elastic portions that extend continuously from the annular portion in a radial shape and being formed of a thin plate of a conductive material; and a soft conductive member mounted on a surface of the elastic portion that faces the rotating ring. The soft conductive member is capable of abutting against a side surface of the rotating ring.

The invention provides a motor and a carbon fiber and circuit board fixing method, the motor comprises a motor shaft, a circuit board and a carbon fiber, the circuit board is provided with a mounting hole, the circuit board sleeves the motor shaft through the mounting hole, the circuit board is provided with a bonding pad along the circumferential direction of the mounting hole, one end of the carbon fiber is in contact with the bonding pad and is welded on the bonding pad, and the other end of the carbon fiber is in contact with the bonding pad. One end, far away from the bonding pad, of the carbon fiber is in contact connection with the motor shaft, the carbon fiber is welded to the bonding pad of the circuit board by arranging the nickel layer and the tin layer on the carbon fiber, one end of the carbon fiber is in contact with the motor shaft, and the other end of the carbon fiber is welded to the bonding pad of the circuit board through the nickel-tin layer. A shaft current conduction path from the motor shaft to the carbon fiber to the bonding pad to the circuit board is formed, shaft current generated by shaft voltage is directly led away from the bearing, electric corrosion caused by bearing oil film breakdown is avoided, and the service life of the motor bearing is prolonged.

This application discloses a tram and its power supply system, relating to the field of tram technology. The power supply system includes an auxiliary inverter, a fuel cell, a power battery, and an insulation monitoring device. The fuel cell and power battery are connected in parallel via a busbar. The busbar connects the traction inverter and air conditioning unit within the tram. Furthermore, based on the parallel connection of the fuel cell and power battery, the pantograph and external contact network of the original technology are eliminated, allowing the current in the power supply circuit to be conducted entirely within the tram itself, eliminating the need for return current via the running rail. This isolates the high-voltage current path from the running rail, reducing the risk of electrolytic corrosion to trackside metal structures, underground pipelines, and signaling equipment caused by stray currents. Moreover, this application also monitors the leakage current of the busbar using an insulation monitoring device, and uses this leakage current to detect busbar grounding faults, improving safety and reliability.

To provide an electrolytic corrosion preventing member capable of suppressing generation of abrasion powder from a conductive member or abrasion powder due to sliding contact between the conductive member and a mating material, suppressing damage of the mating material, and coping with an existing bearing without forming new processing on the bearing and without limiting the type of the bearing.SOLUTION: An electric corrosion prevention member for a rolling bearing includes an annular portion, a spring plate including a plurality of elastic portions radially extending continuously from the annular portion, and a soft conductive member having a planar shape mounted on a surface of the elastic portion facing a rotary ring, wherein the annular portion is pressed against a side surface of a fixed ring by a pressing member, or the annular portion is sandwiched between a flange portion provided on a housing for fixing the fixed ring and the side surface of the fixed ring, so that the soft conductive member can be brought into contact with the side surface of the rotary ring, the spring plate is made of a thin plate of a conductive material, and the elastic portion is bent from a boundary with the annular portion only in a direction in which the soft conductive member is attached to the annular portion.SELECTED DRAWING: Figure 1

The invention discloses a DIC speckle preparation method and device and a metal material local strain characterization method, and relates to the technical field of material characterization analysis, and the method comprises the steps: obtaining a to-be-characterized metal material sample; polishing the to-be-detected surface of the to-be-characterized metal material sample to obtain a smooth surface; and an electrolytic polishing process is adopted, electrolytic corrosion is carried out on the polished to-be-detected surface by using an electrolyte containing nano-particles, so that the nano-particles form dispersively distributed pits on the to-be-detected surface, and preparation of the DIC speckles is completed. According to the method, the nano-particles are introduced into the electrolytic polishing solution, and the dispersively-distributed nano-scale pits are directly formed on the surface of the metal sample in the electrolytic corrosion process to serve as the speckles, so that the risk that an electron microscope chamber is polluted due to poor adhesiveness of traditional spraying speckles is effectively avoided, and the efficiency and reliability of speckle preparation are improved.

The utility model discloses a battery connecting bracket capable of preventing electrolytic corrosion, and relates to the technical field of bracket devices. The electrolytic corrosion prevention battery connecting bracket comprises a bracket device main body, a first communication groove is formed in the bracket device main body, the first communication groove extends out of the upper surface, the lower surface and the left side surface of the bracket device main body, two sliding rails are arranged on the right side surface of the inner wall of the first communication groove, and a rotating block is arranged between the two sliding rails; when the device is used, the device is mounted at a proper position of the new energy automobile, so that the fording box of the device is consistent with the direction of an automobile head, and the first telescopic plate is contracted in the second telescopic plate in the normal driving process; therefore, water is prevented from entering the device as much as possible when the new energy automobile passes through the wading road section, the practicability of the device is improved, the heat dissipation efficiency of the storage battery is improved, and the service life of the storage battery is prolonged as much as possible.

The present disclosure provides an electrolytic corrosion method for dissolvable aluminum alloy microstructure, and relates to the technical field of metal material microstructure characterization. The method comprises: performing a pretreatment operation of polishing, polishing and cleaning on the dissolvable aluminum alloy; mixing anhydrous ethanol, fluoroboric acid, glycerol and perchloric acid to obtain an electrolyte for electrolytic corrosion; placing the pretreated dissolvable aluminum alloy as an anode and an inert electrode as a cathode in an electrolytic cell containing the electrolyte, and performing an electrolytic corrosion process; after the electrolytic corrosion process, taking out the dissolvable aluminum alloy, cleaning and blowing dry to obtain a dissolvable aluminum alloy that can be used for metallographic microscope observation of microstructure. The present disclosure can improve the corrosion effect of the dissolvable aluminum alloy microstructure.

The invention relates to a test method and a test device for simulating electrolytic corrosion of a radiator, and the method comprises the following steps: simplifying a simulated radiator by using a flaky metal sample, electrically connecting the flaky metal sample with a needle-shaped electrode, and immersing the flaky metal sample in deionized water; dividing the sheet-shaped metal samples into three groups, respectively carrying out an anode electrolytic corrosion test, a cathode electrolytic corrosion test and a blank control test, and comparing the states of the sheet-shaped metal samples in each group after the tests are finished, so as to accurately evaluate the leakage current corrosion influence. Compared with the prior art, the method has the advantages that the radiator is simplified into the sample metal sheet for direct corrosion test, the leakage current corrosion amount of the radiator metal sheet can be accurately quantified, and the leakage current corrosion characteristics can be evaluated.

This invention provides a corrosion prevention device that can prevent galvanic corrosion and leakage problems in iron seawater pipes that use seawater as a cooling medium, thereby reducing equipment downtime, worker workload, repair costs, and operational efficiency. [Solution] By installing a zinc rod 8 with a high potential inside the iron seawater pipe 1 and connecting the installed zinc rod to a metal part with a low potential using copper wire 10, corrosion of the iron seawater pipe is suppressed, and by regularly inspecting the installed zinc rod, seawater leakage problems due to electrolytic corrosion of the iron seawater pipe can be avoided. Conventionally, iron seawater pipes have experienced problems where electrolytic corrosion occurs due to the potential difference, leading to rupture and seawater leakage.