88 results about "Electrolytic corrosion" patented technology

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 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.

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 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 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.

In order to provide a rolling bearing that is suitable for an electric axle unit and that is capable of achieving both prevention of traveling wave type creep of an inner ring or an outer ring and prevention of electrical corrosion of the inner and outer rings and rolling elements, one peripheral part (22) of an inner peripheral part (12) of the inner ring (10) and an outer peripheral part (22) of the outer ring (20) includes a flank surface (22b) that has a depth in a radial direction relative to a corresponding inner diameter surface or outer diameter surface (22a) and separates the corresponding inner or outer diameter surface (22a) throughout the entire width. The inner ring or outer ring (20) having the one peripheral part (22) has a metal ring (24) including a raceway surface (21a), and a resin part (25) covering the metal ring (24). The inner diameter surface or outer diameter surface (22a) included in the one peripheral part (22), the flank surface (22b), and corresponding end surfaces (23) continuous with the one peripheral part (22) are formed by the resin part (25).

The invention discloses a connector assembly and electronic equipment. The connector assembly comprises a connector body and a switch assembly. The connector body is provided with an output terminal, and the output terminal is used for enabling the connector assembly to supply power to the outside. The switch assembly is provided with a power supply terminal and a power connection terminal, the power supply terminal is electrically connected with the power supply circuit, and the power connection terminal is configured to be electrically disconnected from at least one of the output terminal and the power supply terminal when the connector assembly is in a non-connection state, so that the connector body is powered off; when the connector assembly is in the connection state, the connector assembly is electrically conducted with the output terminal and the power supply terminal so that the connector body can be powered on. According to the connector assembly and the electronic equipment disclosed by the invention, electrolytic corrosion at the output terminal of the connector can be prevented, so that interface damage of the electronic equipment is avoided.

The utility model discloses a high-hardness nickel-free electrolytic corrosion-resistant coating structure, which comprises a pretreated product base layer and a conductive copper layer attached to the outer surface of the pretreated product base layer. According to the electroplating structure disclosed by the utility model, the passivation treatment film coating layer and the like are arranged, so that when the electroplating structure is used, the electrolytic corrosion resistant composite coating is additionally arranged on the outermost layer of the electroplating structure; the electrolytic corrosion resistant composite plating layer is composed of a decorative chromium plating layer attached by electroplating, a passivating treatment film coating layer attached by chemical plating and a sealing agent coating layer for coating, so that the brightness and attractiveness of the product can be improved by utilizing the decorative chromium plating layer; a compact protective film is formed on the surface of the plating layer through the passivating coating layer attached through chemical plating, the corrosion resistance of the plating layer is improved, the sealing agent is coated through the sealing agent coating layer, a second protective film is formed on the surface of the plating layer, and therefore the electroplating structure achieves the multi-stage electrolytic corrosion resistance protection effect.

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.

A bearing seal is provided that prevents electrolytic corrosion of a rolling bearing, improves conductivity stability and facilitates the manufacture of the bearing seal. A bearing seal 1 comprises an annular sealing ring 2 with a core metal 4 and an elastic body 5, and a conductive material 3 in contact with an outer ring 11 and an inner ring 12 to electrically connect the outer ring 11 and the inner ring 12. The conductive material 3 is a conductive fiber body 8, which is a bundle of conductive fibers, and is (re)held by the sealing ring 2 while connected to the elastic body 5. An outer end 9 of the conductive fiber body 8 projects outwards in a radial direction R from the sealing ring 2 RO and comes into contact with the outer ring 11 at a position that, in a rolling bearing A, is directed outwards in a lateral direction B relative to the core metal 4 BO.An inner end 10 in the radial direction R of the conductive fiber body 8 protrudes in the radial direction R from the sealing ring 2 inwards RI and comes into contact with the inner ring 12 at a position which is directed outwards BO in the width direction B relative to the core metal 4 of the rolling bearing A.

The invention discloses an electrolytic corrosion agent for a secondary phase in GH4169 alloy and a corrosion method, and belongs to the technical field of chemical etching of metal materials, the electrolytic corrosion agent comprises 2 parts of ethylene glycol, 1 part of hydrofluoric acid, 1 part of nitric acid and 1 part of deionized water; the method comprises the following steps: grinding an alloy cutting sample step by step with abrasive paper, pretreating with polishing paste, and finely polishing; taking the sample as an anode, taking a graphite electrode as a cathode, and constructing an electrolysis system in an electrolytic bath; applying direct-current voltage, and controlling current density corrosion; and S4, after corrosion is finished, washing with deionized water, and blow-drying with hot air. The electrolytic corrosion agent with a specific ratio is designed, the difference is accurately adapted by utilizing the synergistic effect of all the components, hydrofluoric acid selectively etches a secondary phase rich in Nb and Mo, nitric acid strengthens the electrode potential difference between the secondary phase and a matrix by regulating and controlling the oxidation environment, ethylene glycol improves the corrosion uniformity, local over-corrosion is avoided, and the corrosion resistance of the secondary phase is improved. The deionized water balances the conductivity and stability of the system.