135 results about "Electrolytic corrosion" patented technology

The invention discloses a vibration-CO2 corrosion coupling effect real-time monitoring system and monitoring method for a well cementation cement sheath of an oil and gas well in a high-temperature and high-pressure environment. The system comprises a kettle system which is fixed with a base of an axial loading system, and a push rod of the axial loading system extends into the kettle system from the center of a kettle cover and is pressed on a detected body; the CT detection system is mounted below a jack supporting plate of the axial loading system; the electrolytic corrosion system is connected with the lower end of a first embedded axial pipeline on the side wall of a kettle body in the kettle system so as to apply an experimental environment; the gas pressurization system is divided into two paths, one path is led into the kettle system from the lower part, and the other path is connected with the lower end of the second embedded axial pipeline; a sleeve of the kettle system is fixed in the kettle system, the nondestructive testing system is installed in the middle of the sleeve, and the vibration system in the sleeve is installed on the lower portion of the sleeve. According to the invention, axial loading, gas pressurization and heating devices are integrated, and an underground high-temperature and high-pressure environment is simulated; and CT and ultrasonic waves cooperate to realize multi-dimensional dynamic monitoring of the corrosion process.

The invention relates to the technical field of advanced manufacturing of metal materials. A metallographic analysis method for detecting fine Laves phases in homogenized GH4169 alloy can clearly display the average particle size, the area proportion and the spatial distribution characteristics of the fine and dispersively distributed Laves phases by performing homogenizing heat treatment on as-cast GH4169 alloy and combining an optimized sample preparation process and an electrolytic corrosion technology. Compared with a traditional chemical erosion method, the method provided by the invention has higher detection precision, analysis efficiency, imaging quality and statistical reliability, and can realize accurate identification and quantitative analysis of trace Laves phases. The method is simple and convenient to operate, is suitable for evaluating the homogenization treatment effect and predicting the subsequent processing performance of the material, and provides a reliable basis for quality control and process optimization of the high-temperature alloy.

The invention relates to a corrosive agent and a corrosion method for displaying a 32CrNi3MoVE crystal boundary of alloy steel, which are characterized in that a common chemical product is used as an electrolytic corrosive agent after being simply proportioned, and the 32CrNi3MoVE steel quenched and tempered state original austenite crystal boundary is clearly displayed by a proper corrosion method. Chemical reagents used by the corrosive are economical and applicable, the corrosive is composed of alum, oxalic acid, dishwashing liquid, distilled water and the like which are existing in a laboratory, the proportioning of the corrosive is the key, the electrolytic corrosion method is simple to operate, alum can effectively display the grain boundary, oxalic acid provides a weak acid environment for oxidation reduction, and the corrosion effect is good. The dishwashing liquid slows down the corrosion rate of weak acid electrolyte to a metallographic specimen, weakens structure display, and improves the definition of crystal boundary display. The corroded sample is lightly polished in a polishing machine, and the corrosive agent ratio and the electrolytic corrosion method are combined to form an efficient novel corrosion method. The traditional corrosive agent capable of completely replacing saturated picric acid and a proper amount of detergent and the corrosion method effectively solve the problem of 32CrNi 3MoVE steel quenched and tempered state original austenite grain boundary display.

To provide a compact current-carrying unit suitable for use in an oil bath, and to provide a bearing unit with an electrolytic corrosion preventive effect.SOLUTION: A current-carrying unit 2 includes a conductive annular case body part 6, a conductive energization member 7 that protrudes radially inward from the case body part 6, and an elastic member 8 that biases the energization member 7 radially inward. The case body part 6 is configured such that oil holes 15 and 16 are formed to allow a lubricant to flow in an axial direction. The bearing unit 1 includes the current-carrying unit 2, and a bearing 3 having an outer ring 22, an inner ring 23 disposed on an inner diameter side of the outer ring 22, rolling elements 24 provided between the outer ring 22 and the inner ring 23, and a retainer 25 that holds the rolling elements 24 at predetermined intervals in a circumferential direction. The current-carrying unit 2 and the bearing 3 are both integrally configured by having the former fitted into the latter.SELECTED DRAWING: Figure 1

This product is a bearing plate that is installed at the intersections of rope materials such as wire ropes arranged in a grid pattern on a slope to prevent surface collapse. It consists of a round washer with a reinforcing tube, a rope material external slippage prevention body, and a pressure receiving body. The product is attached to a rock bolt driven into the intersection of the rope material, and the rope material is wound around the pressure receiving body. The rope material external slippage prevention body and pressure receiving body are made of resin material, which prevents electrolytic corrosion caused by contact with the rope material and makes the product lightweight.

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.

The invention discloses a method for accurately measuring the phase content in stainless steel. The method is suitable for stainless steel containing at least one phase of ferrite, austenite, cementite and martensite. The method comprises the following steps: S1, cutting, grinding and polishing a stainless steel sample to obtain a bright surface; s2, pre-judging the type and the number of contained phases through metallographic structure observation in combination with component analysis and a heat treatment process; and S3, directional detection is conducted according to the pre-judgment result, ferrite is measured through metallographic software after being subjected to electrolytic corrosion through a KOH electrolyte, austenite is measured through an X-ray diffraction technology, cementite is measured through a laser confocal microscope after being subjected to acid etching, and martensite is obtained by subtracting the sum of the measured phase content by 100%. The method integrates various technical advantages, is simple and convenient to operate, wide in detection range and high in precision, and can provide accurate data support for stainless steel process optimization and material development.

To suppress the current flowing between an outer ring and an inner ring via rolling elements in a rolling bearing, thereby preventing the occurrence of electrical corrosion.SOLUTION: A first rolling bearing 10A includes an outer ring 11, an inner ring 12, rolling elements 13, a conductive member 15 fixed to the outer ring 11 and slidingly contacting the inner ring 12, and a covering member 50 that covers an outer circumferential surface 11a and an end face 11b of the outer ring 11 and an annular groove 23 in the outer ring 12 serving as a mounting portion for the conductive member 15. The covering member 50 includes an insulating layer 51 in contact with the outer ring 11, and a conductive layer 52 arranged on the side opposite to the side of the insulating layer 51 that contacts the outer ring 11. The insulating layer 51 is insulating, and the conductive layer 52 is conductive.SELECTED DRAWING: Figure 2

The invention provides a large-shaft-diameter motor grounding carbon brush device. The large-shaft-diameter motor grounding carbon brush device comprises a rotor main shaft; the grounding ring is arranged on the outer side of the rotor main shaft, and the grounding ring is provided with at least one mounting hole; the carbon brush assembly is arranged between the outer ring of the rotor main shaft and the inner ring of the grounding ring, the carbon brush assembly comprises at least one carbon fiber bundle, two end parts of the carbon fiber bundle are overlapped and connected in the same direction to form a fixing part, a bending part and a connecting part for connecting the bending part and the fixing part, and the fixing part is fixedly connected to the mounting hole and externally connected with the grounding end; at least part of the bending part is used for being in contact and conductive connection with a rotor spindle, and spindle current is introduced into the grounding end through the connecting part and the fixing part in sequence. The shaft electric corrosion prevention device can be in stable contact with a rotor main shaft for electric conduction, can reduce shaft voltage to realize a shaft electric corrosion prevention function, and is particularly suitable for large-shaft-diameter high-linear-speed motors.

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.

To provide a method for evaluating the electrical corrosion resistance of a rolling bearing, the method making it possible to easily and appropriately evaluate whether the rolling bearing has electrical corrosion resistance capable of preventing occurrence of ridge marks under certain operating conditions.SOLUTION: The method includes: a test step (S1) of applying a predetermined voltage to a rolling bearing in a state where an inner ring and an outer ring rotate relative to each other; an investigation step (S2) of searching a first raceway surface and a second raceway surface after completion of the test step for an abnormal surface portion generated when a single discharge occurs between the first raceway surface or the second raceway surface and rolling elements; and an evaluation step (S4) of determining that the rolling bearing is capable of generating ridge marks due to electrical corrosion on one of the first raceway surface and the second raceway surface when the abnormal surface portion consisting of discharge marks formed in an uneven pattern is found in the investigation step, and determining that the rolling bearing does not generate ridge marks when the discharge marks are not found in the investigation step.SELECTED DRAWING: Figure 1

A motor device prevents electrolytic corrosion of a bearing. The motor device is mounted on a vehicle and has a stator installed in a housing and provided with a concentrated winding coil, a rotor housed in the center of the stator and provided with a permanent magnet, a bearing installed in the housing and supporting a rotating shaft of the rotor, an inverter provided between the stator and a power storage body and controlling an energization state of the concentrated winding coil, and an energization control section that outputs a control signal to the inverter and executes field weakening control that generates a magnetic flux of the concentrated winding coil in a direction to weaken a magnetic flux of the permanent magnet. The energization control section executes the field weakening control to make a potential difference between the housing and the rotating shaft, i.e., shaft voltage Va1, lower than a withstand voltage Vb1 of the bearing when a motor revolution number Nm is greater than a threshold value Nx.

The utility model discloses an electrode for low-voltage micro-arc machining of a square hole, and particularly relates to the technical field of non-traditional machining, the electrode comprises a clamping part and a machining part, the machining part is fixedly communicated with the center position of the bottom end of the clamping part, a center through hole is formed in the center axis of the machining part, and the top end diameter of the center through hole is larger than the bottom end diameter. A spiral groove is formed in the center through hole, and a chip groove is formed in the outer side of the machining part. Scraps and waste residues generated in the machining process can be discharged through the three chip discharging grooves, meanwhile, the three chip discharging grooves can assist in heat dissipation and prevent a machining area from being overheated, and therefore a machining part and a workpiece are protected, the flow path of fluid can be changed through the special geometrical shape of the spiral grooves, and the machining efficiency is improved. Therefore, the fluid speed is increased to strengthen the fluid dynamic arc breaking effect, the discharging effect of the inner flushing liquid on interelectrode electric corrosion products is improved, the structure is simple, the electric corrosion products can be conveniently discharged, and the loss of a machining part is effectively reduced.

The utility model discloses ultrahigh-voltage corrosion foil production equipment based on an aluminum electrolytic capacitor. The ultrahigh-voltage corrosion foil production equipment comprises a workbench and a guide mechanism, seven transmission rollers are rotationally connected into the workbench, an electrolytic tank is arranged at the lower end of the workbench, graphite electrodes are arranged at the front end and the rear end of the electrolytic tank, conductive rollers which are symmetrically distributed are rotationally connected to the middle of the electrolytic tank, and a support is arranged at the rear end of the upper surface of the workbench; the guide mechanism is arranged between the workbench and the support; the ultrahigh-voltage corrosion foil production equipment further comprises a control switch set, the control switch set is arranged in the middle of the right side surface of the workbench, the input end of the graphite electrode and the input end of the conductive roller are both electrically connected with the output end of the control switch set, and the graphite electrode is a cathode. Efficient drying after electrolytic corrosion of the ultrahigh-pressure corrosion foil can be achieved, water vapor is effectively prevented from falling back to the upper end of the ultrahigh-pressure corrosion foil, and the product effect of the ultrahigh-pressure corrosion foil is effectively improved.

The application discloses a kind of corrosion methods for revealing alloy sample metallographic structure, comprising: step S1, preparation electrolytic etchant: using oxalic acid, sodium bicarbonate and concentrated nitric acid preparation final concentration is 0.25-0.5mol / L sodium oxalate and 0.15-0.3mol / L nitric acid mixed aqueous solution;Step S2, electrolytic etching of corrosion piece: electrolytic etchant is poured into electrolytic etching instrument, and the alloy sample to be corroded is placed in electrolytic etching liquid and electrolytic etching is carried out.The electrolytic etchant of the application uses oxalic acid, sodium bicarbonate and concentrated nitric acid as reactant, and is prepared by chemical ion reaction.After the preparation of etchant is finished, a small amount of carbonate ions and hydrogen ions are still stored in the etchant, so that a small amount of carbonate ions and hydrogen ions will continue to react when the alloy sample is electrolyzed, and micro-bubbles are attached to the alloy sample, so that the metallographic photo taken has stereoscopic imaging effect, and the grain boundary is clear and identifiable.

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.

To provide a rolling bearing that achieves high performance in resistance to electrical corrosion.SOLUTION: A rolling bearing 1 has a metallic inner ring 2, a metallic outer ring 3, rolling elements 4 arranged between the inner ring 2 and the outer ring 3, and a conductive seal 6 for sealing the internal space between the inner ring 2 and the outer ring 3. The conductive seal 6 comprises a conductive rubber 61 and a plate-like core metal 62, wherein an end on the inner ring 2 side and an end on the outer ring 3 side of the conductive rubber 61 are held against the inner ring 2 and the outer ring 3 by the restoring force of the conductive rubber 61. The core metal 62 is fixed to the rolling element 4 side of the conductive rubber 61, and at a bent portion 621 formed by bending an end of the core metal 62 on the outer ring 3 side, a plate face of the core metal 62 directly contacts the outer ring 3.SELECTED DRAWING: Figure 1

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 discloses an electric-corrosion-resistant tungsten alloy contact material. The electric-corrosion-resistant tungsten alloy contact material comprises tungsten powder, copper powder and an additive, wherein the substance mass ratio of the tungsten powder to the copper powder to the additive is (93-97): (4.9-2.1): (2.1-0.9). The tungsten alloy contact material is prepared by blending tungsten powder, copper powder and an additive, meanwhile, scandium-cerium continuous effect liquid in the additive and a titanium boride agent are subjected to stirring improvement treatment, and carbon nanotubes, zirconium oxide, a silane coupling agent KH550 and a dopamine hydrochloride solution in the continuous effect liquid are blended and matched; according to the titanium boride agent obtained by blending titanium boride with samarium chloride and graphene, through synergistic improvement and co-coordination of the raw materials, the obtained additive optimizes the ablation resistance, strength performance and hardness coordination of the product in a system, and the temperature change resistance stability effect of the product is remarkable.

The invention relates to the field of insulators, and discloses a corrosion-resistant alternating-current insulator which comprises a main body structure, the main body structure comprises component parts and cementing parts arranged on the outer sides of the component parts, the cementing parts are used for connecting the component parts, the component parts comprise porcelain parts and steel feet arranged on the outer sides of the porcelain parts, and the steel feet are arranged on the outer sides of the porcelain parts. A gap is formed between the porcelain piece and the steel foot, the coating layer contains acetylene carbon black, and the coating layer has a conductive effect; acetylene carbon black is added into vulcanized silicone rubber, so that a coating layer has conductivity, leakage current is uniformly distributed on the surface of the steel foot, original non-uniform electrolytic corrosion is changed into uniform corrosion, the progress of damage to the mechanical property of the steel foot is delayed, in addition, the coating layer has a certain moisture isolation effect, and the service life of the steel foot is prolonged. Therefore, the electrochemical corrosion of the moisture to the steel foot can be reduced.

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.

1. The name of the design product: environmental automatic electrolytic etching machine. 2. The use of the design product: the design product is used for corrosion, oxidation treatment or surface strengthening of metal surface. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view. 5. The bottom surface of the design product is the part that is not easy to see or cannot be seen during use, so the top view is omitted.

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 utility model provides an electrolytic corrosion steel low-power corrosion device, which belongs to the technical field of continuous casting slab low-power inspection equipment, and comprises a clear water tank, a pickling tank, an acid storage tank and an electric cabinet, a first pipeline is arranged between the acid storage tank and the pickling tank, a first circulating pump is arranged on the first pipeline, a second pipeline is arranged between the clear water tank and the acid storage tank, and a second circulating pump is arranged on the second pipeline. And a second circulating pump is arranged on the second pipeline, electrode plates are arranged on the two sides of the inner cavity of the pickling tank correspondingly, and the mains supply is electrically connected with the two electrode plates through the electric cabinet. When the low-power corrosion device for the electrolytic corrosion steel provided by the utility model is adopted, a sample is firstly placed, then acid liquor is added, and clear water is added for cleaning after corrosion is completed. The phenomenon of over-corrosion of the sample due to long-time soaking in the acid liquor is avoided, and the service life of the acid liquor is prolonged. Compared with hot acid corrosion, the device has the advantages of no heating process, low acid gas concentration, optimized working environment and convenience and safety in operation.

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 relates to the technical field of metallographic corrosion, and specifically relates to an electrolytic corrosion solution for the metallographic structure of cobalt and cobalt-based alloys and a metallographic corrosion method thereof. The electrolytic corrosion solution for the metallographic structure of cobalt and cobalt-based alloys includes perchloric acid, benzotriazole, and absolute ethanol; the volume ratio of the perchloric acid solution, the saturated benzotriazole ethanol solution, and absolute ethanol is (20-30):(0.2-0.5):(69.5-79.8), and the concentration of the perchloric acid solution is 70-72%, realizing efficient and precise electrolytic corrosion of the metallographic structure of cobalt and cobalt-based alloy materials. This corrosion solution can not only clearly show the microscopic structure characteristics of the material, but also effectively avoid the phenomena of over-corrosion or under-corrosion, thus greatly improving the observation quality and accuracy of the metallographic structure. The corrosion effect of this corrosion solution is less affected by temperature, and good corrosion effects can be achieved at 0-60°C.

The present invention discloses a conductive terminal made of a metal copper plate. The conductive terminal includes a contact area for mating with a mating connector. The contact area is electroplated with a metal coating on the surface of the metal copper plate. The metal coating includes at least a first rhodium alloy coating, a second rhodium alloy coating, and multiple corrosion-resistant layers. Electroplating at least two rhodium alloy coatings on the surface of the conductive terminal improves the conductive terminal's resistance to electrolytic and chemical corrosion, thereby enhancing its performance and extending its service life.