Portable metallographic corrosion device

Abstract

The utility model relates to the technical field of metallographic corrosion testing devices, in particular to a portable metallographic corrosion device. The utility model provides a portable metallographic corrosion device. The portable metallographic corrosion device comprises a handheld handle, the working cavity is formed in one end of the handheld handle, an anode plate is arranged on the side, away from the handheld handle, of the working cavity, an electrolytic corrosion medium storage cavity is formed in the working cavity, and a cathode plate is arranged in the electrolytic corrosion medium storage cavity; a power supply is arranged in the handheld handle, and the anode plate and the cathode plate are electrically connected with the power supply. The utility model aims to solve the technical problem that in the prior art, the device cannot be used in equipment which cannot stop and destroy sampling.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metallographic corrosion test device, especially to a portable metallographic corrosion device. BACKGROUND

[0002] Stainless steel materials are widely used in chemical industry, shipbuilding, nuclear power and building materials due to their excellent corrosion resistance, oxidation resistance and other properties. The application scenarios often involve extreme environmental conditions such as high temperature, high pressure, deep cooling, hydrogen proximity and radiation. However, the performance of stainless steel materials will change over time during service in extreme environments such as high temperature, high pressure, deep cooling, hydrogen proximity and radiation. Metallographic testing is an effective way to observe and evaluate the performance changes of materials under extreme environmental service. At the same time, because the equipment involved in the chemical industry, shipbuilding, nuclear power and building materials fields is served in relatively extreme environments, the equipment is also relatively large or is a long-distance pipeline, and the equipment cannot be shut down and sampled, etc. Therefore, only on-site metallographic operation can be carried out.

[0003] Currently, in the on-site metallographic operation, the conventional etchant used for stainless steel materials is ferric chloride hydrochloric acid aqueous solution, aqua regia, etc. In the on-site operation, the etchant is soaked with degreasing cotton and then used to wipe the surface to be tested. However, there are problems such as long etching time, overflow of etching liquid, easy contamination of the test surface, poor imaging effect, etc. In the laboratory, electrolytic etching method is often used to improve the etching efficiency and imaging effect. However, the electrolytic etching device includes power supply, electrolyte and auxiliary device, etc., which is not convenient for on-site environmental operation.

[0004] A hand-held metallographic sample corrosion device for precise time control was disclosed in Chinese invention patent CN114323886B on November 17, 2023, which includes a display, a handheld device and a metallographic sample clamping device connected in turn. The display includes an encapsulation shell, a screen arranged on the encapsulation shell and a control module arranged in the encapsulation shell. The corrosion time control module includes a processor and a digital keyboard, an LED display circuit and an audible and visual alarm circuit connected with the processor respectively. The metallographic sample clamping device is used to clamp the metallographic sample to be etched. Although the product of the patent can be handheld and time-controlled, it cannot be used for equipment that cannot be stopped and sampled.

[0005] Therefore, it is necessary to provide a portable metallographic corrosion device that can be used in equipment that cannot be stopped and sampled. SUMMARY

[0006] The utility model aims at overcoming the deficiencies of the prior art, and provides a portable metallographic corrosion device, which aims to solve the technical problem that the prior art cannot be used in equipment that cannot be stopped and sampled.

[0007] In order to achieve the above object, the utility model provides a portable metallographic corrosion device, including the handle that can hold, work cavity is arranged in the handle that can hold one end, work cavity is away from the side of handle that can hold is provided with anode plate, be provided with cathode plate in the electrolytic corrosion medium storage cavity in work cavity, be provided with power supply in the handle that can hold, anode plate and cathode plate all with power supply electricity is connected.

[0008] As preferred, the electrolytic corrosion medium storage cavity is movably arranged in the work cavity, and a rebound device is arranged between the electrolytic corrosion medium storage cavity and the work cavity, and the rebound device is a spring.

[0009] As preferred, the handle that can hold is provided with a controller, and the controller includes a start-stop switch, a voltage adjustment button and a corrosion time control button.

[0010] As preferred, the power supply is a charging power supply, and the voltage of the direct current power supply provided by the power supply is 1V-10V.

[0011] As preferred, the cathode plate is a T-shaped stainless steel plate and is arranged at the bottom of the electrolytic corrosion medium storage cavity, the length of the cathode plate is less than the depth of the electrolytic corrosion medium storage cavity, and the electrolytic corrosion medium storage cavity is made of an insulating and corrosion-resistant material.

[0012] As preferred, the outer side of the work cavity is provided with a protective cover.

[0013] As preferred, the work cavity is in the shape of a cylinder, the work cavity includes a hollow shell, a plurality of lifting pieces arranged on the hollow shell and an elastic piece arranged at the bottom of the lifting pieces, the anode plate is arranged above the lifting pieces, and the anode plate is a copper sheet.

[0014] Compared with the prior art, the portable metallographic corrosion device has the following advantages:

[0015] 1. The portable metallographic corrosion device does not need to be provided with a power supply and an electrolytic tank on site, has a simple structure, is easy to operate, and can quickly, efficiently and with high quality realize the detection requirement of a small detection surface.

[0016] 2. By arranging the anode plate on the lifting piece, the anode plate can deform with the lifting piece and can more fully contact the profiled workpiece surface.

[0017] The features and advantages of the utility model will be described in detail with reference to the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the structural schematic diagram of the portable metallographic corrosion device of the utility model.

[0019] Figure 2 is the structural circuit principle diagram of the electrolytic corrosion of the utility model.

[0020] Figure 3 is the schematic diagram of the small-size LED programmable time relay of the utility model.

[0021] Figure 4 is the expanded view of another working cavity structure of the utility model.

[0022] Figure 5 is the sectional view of the utility model Figure 4 .

[0023] Figure 6 is the plan view of the utility model Figure 4 .

[0024] Among them:

[0025] 1-holdable handle; 2-power supply; 3-controller; 4-working cavity; 41-hollow shell; 42-lifting piece; 43-elastic piece; 5-anode plate; 6-electrolytic corrosion medium storage cavity; 7-cathode plate; 8-rebound device; 9-protection cover. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below through the drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0027] In the description of the utility model, it should be explained that when an element is called "fixed to" or "set to" another element, it can be directly on another element or indirectly on another element. When an element is called "connected to" another element, it can be directly connected to another element or indirectly connected to another element.

[0028] In the description of the utility model, it needs to be explained that, the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the application when it is usually placed, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included one or more of the features. In the description of the utility model, "a plurality of" means two or more, unless otherwise explicitly specified and limited. "Several" means one or more, unless otherwise explicitly specified and limited.

[0029] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connect", "connect" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. Embodiment

[0030] Reference Figure 1 The utility model embodiment provides a portable metallographic corrosion device, including portable handle 1;The working cavity 4 of portable handle 1 one end is provided with anode plate 5 on the side away from portable handle 1 of working cavity 4, be provided with electrolytic corrosion medium storage cavity 6 in working cavity 4, be provided with cathode plate 7 in electrolytic corrosion medium storage cavity 6, portable handle 1 is provided with power supply 2, anode plate 5 and cathode plate 7 all and power supply 2 electric connection.

[0031] Specifically, the anode plate and the cathode plate are two working electrodes of an electrolytic corrosion system. The anode plate is placed at one end of the working cavity, which facilitates contact with the workpiece to be detected, is connected to the positive electrode of the power supply, and sets the workpiece to be detected as the anode of the electrolytic corrosion device. The cathode plate is filled with degreasing cotton soaked in electrolytic corrosion medium (as an electrolyte system of the electrolytic device) to ensure good contact with the cathode, and the cathode plate is connected to the negative electrode of the power supply. The specific principle of electrolytic corrosion can be referred to in the description of the utility model. Figure 2The principle is that an electrochemical reaction occurs when current passes through the workpiece, the electrolytic corrosion medium and the cathode plate, and the part to be dissolved and removed is removed by the electrochemical reaction to achieve the purpose of metal corrosion.

[0032] Generally, the corrosion medium is selected as 10% oxalic acid aqueous solution and 60% nitric acid aqueous solution. The degreasing cotton is immersed in the electrolytic corrosion medium, and is filled in the electrolytic corrosion medium storage cavity 6. Of course, other corrosion media can also be selected for different materials.

[0033] Further, the handle is convenient to hold, the inside of the handle is a cavity, a rechargeable power supply is placed in the cavity, the outside of the handle is insulated from the power supply circuit in the device, a general charging interface is left, the power supply is convenient to charge, and the device can be used for a long time on site.

[0034] Further, referring to Figure 1 , the electrolytic corrosion medium storage cavity 6 is movably arranged in the working cavity 4, a rebound device 8 is arranged between the electrolytic corrosion medium storage cavity 6 and the working cavity 4, and the rebound device 8 is a spring. Mainly realize that after the portable stainless steel material metallographic sample preparation electrolytic corrosion test device contacts the workpiece to be detected, the anode plate is in good contact with the workpiece to be detected, and the anode plate is relatively insulated from the electrolytic corrosion medium.

[0035] Specifically, in a non-working state, the spring is in a natural stretched state, the electrolytic corrosion medium storage cavity is stretched out, and the anode plate is not in contact with the measured workpiece. When working, the anode plate needs to be in contact with the measured workpiece, and at the same time, the electrolytic corrosion medium storage cavity in which the corrosion medium is placed also needs to be in good contact with the detection surface. At this time, the electrolytic corrosion medium storage cavity is in close contact with the detection surface through the spring.

[0036] Further, the handle 1 is provided with a controller 3, the controller 3 includes a start-stop switch, a voltage adjustment button and a corrosion time control button. According to the specific material and corrosion condition requirements, the corrosion voltage and corrosion time are set, and the voltage stabilizing function is realized to ensure the continuous and stable voltage output. An LED screen can be configured to display the working power supply. The controller is a small-size LED programmable time relay, as shown in Figure 3 , which is used to display numerical values, and has up and down adjustment buttons to adjust the output voltage value and display the working time. The controller is directly connected with the power supply to facilitate time control. Of course, other existing controllers such as the display in patent CN114323886B can also be selected. It should be considered that any controller capable of realizing the functions of the start-stop switch, the voltage adjustment button and the corrosion time control button is within the protection scope of the present application.

[0037] Further, the power supply 2 is a charging power supply, and the voltage of the direct current power supply provided by the power supply 2 is 1V-10V. According to the different materials to be detected, the output voltage and the corrosion time are different. Further, the output voltage range can be 1.0V to 5.0V, and the corrosion time can be in the range of 10S to 30S, and the metallographic test effect is better.

[0038] Further, the cathode plate 7 is a T-shaped stainless steel plate and is arranged at the bottom of the electrolytic corrosion medium storage cavity 6. The length of the cathode plate 7 is less than the depth of the electrolytic corrosion medium storage cavity 6, so that the degreasing cotton soaked in the electrolytic corrosion medium can be well contacted with the cathode. The electrolytic corrosion medium storage cavity 6 is made of insulating and corrosion-resistant material, so as to ensure that the copper plate and the stainless steel plate are relatively independent and do not form a current loop. The current loop exists between the workpiece (anode) and the stainless steel plate (cathode).

[0039] Further, the outer side of the working cavity 4 is provided with a protective cover 9. The material is soft silicone corrosion-resistant material, which is sealed with the working cavity. After operation, the electrolytic corrosion medium is prevented from separating, the environment is prevented from being polluted or the workpiece is prevented from being damaged, and human contact with the corrosion medium is also avoided.

[0040] Specific working process:

[0041] First, the workpiece to be corroded is ground and polished on site. The test device is removed from the device protective cover, the degreasing cotton soaked in the electrolytic corrosion medium is completely filled in the electrolytic corrosion medium storage cavity, the output voltage and the corrosion time on the controller are adjusted, and the electrolytic corrosion medium storage cavity is placed at the polishing position of the workpiece. The anode plate end is kept in contact with the polishing part of the workpiece, and the corrosion medium is in contact with the polishing part of the workpiece. Start the electrolytic corrosion operation, and turn off the power supply after the corrosion operation is completed (the test selects the controller separation of the power supply switch box, which is a separate power supply switch). Remove the test device from the measured work and install the device protective cover.

[0042] By using the test device of the present application, the power supply and electrolytic tank do not need to be configured on site, the device structure is simple, the operability is strong, the corrosion time is short, the reliability is high, the use is environmentally friendly, the test surface is relatively clean, and the detection of small detection surface can be quickly, efficiently and high quality. Embodiment

[0043] On the basis of the first embodiment, for some abnormal workpiece surfaces, the anode plate and the workpiece surface are difficult to contact or the contact area is too small, so the structure of the working cavity 4 is optimized, and the specific optimization is as follows.

[0044] Reference Figures 4-6In an optional embodiment, the working cavity 4 is in the shape of a cylinder; the working cavity 4 comprises a hollow shell 41, a plurality of lifting pieces 42 arranged on the hollow shell 41, and elastic pieces 43 arranged at the bottom of the lifting pieces 42; the anode plate 5 is arranged above the lifting pieces 42, and the anode plate 5 is a copper sheet.

[0045] Specifically, the thickness of the anode plate copper sheet cannot be too thick, and the thin copper sheet itself is easy to deform. The elastic pieces are spring groups, and each lifting piece corresponds to a spring. During the contact between the copper sheet and the workpiece, the spring pushes the lifting piece to make the copper sheet deform better and contact the surface of the workpiece. The corrosion medium is in contact with the workpiece through the absorbent cotton, and the absorbent cotton itself is a soft material and can obtain a larger contact surface. The optimized corrosion effect is better, and the electrolysis effect will not be interrupted.

[0046] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, or improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A portable metallographic etching device comprising a handle (1) that can be held; characterized in that: The working cavity (4) is arranged at one end of the holding handle (1), and an anode plate (5) is arranged at the side of the working cavity (4) away from the holding handle (1); an electrolytic corrosion medium storage cavity (6) is arranged in the working cavity (4), and a cathode plate (7) is arranged in the electrolytic corrosion medium storage cavity (6); a power supply (2) is arranged in the holding handle (1), and the anode plate (5) and the cathode plate (7) are electrically connected with the power supply (2).

2. A portable metallographic etching device as claimed in claim 1, characterized in that: The electrolytic corrosion medium storage cavity (6) is movably arranged in the working cavity (4), and a rebound device (8) is arranged between the electrolytic corrosion medium storage cavity (6) and the working cavity (4), and the rebound device (8) is a spring.

3. A portable metallographic etching device as claimed in claim 1, characterized in that: A controller (3) is arranged on the holding handle (1), and the controller (3) comprises a start-stop switch, a voltage adjustment button and a corrosion time control button.

4. A portable metallographic etching device as claimed in claim 1, characterized in that: The power supply (2) is a charging power supply, and the voltage of the direct current power supply provided by the power supply (2) is 1V-10V.

5. A portable metallographic etching device as claimed in claim 1, characterized in that: The cathode plate (7) is a T-shaped stainless steel plate and is arranged at the bottom of the electrolytic corrosion medium storage cavity (6), the length of the cathode plate (7) is less than the depth of the electrolytic corrosion medium storage cavity (6), and the electrolytic corrosion medium storage cavity (6) is made of an insulating and corrosion-resistant material.

6. A portable metallographic etching device as claimed in claim 1, characterized in that: A protective cover (9) is arranged at the outside of the working cavity (4).

7. A portable metallographic etching device as claimed in claim 1, characterized in that: The working cavity (4) is arranged in a cylindrical shape, the working cavity (4) comprises a hollow shell (41), a plurality of lifting pieces (42) arranged on the hollow shell (41) and elastic pieces (43) arranged at the bottom of the lifting pieces (42), the anode plate (5) is arranged above the lifting pieces (42), and the anode plate (5) is a copper sheet.

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