Tool for electrolytic corrosion test of dissimilar steel welded joint
By designing an electrolytic corrosion test tool for different steel welded joints, the applied current voltage is used to offset the potential difference between metals, and the simultaneous corrosion and metallographic structure development of different steel welded joints are achieved, and the electrolysis of different steel welded joints is solved. The problem of metallographic detection in corrosion tests improves the test efficiency.
Patent Information
- Application Number
- CN202420809377.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-18
AI Technical Summary
In the electrolytic corrosion test of different steel welded joints, due to the potential difference between the two metals, the metal phase structure cannot be present at the same time, resulting in difficulty in metallographic detection.
A tool set for electrolytic corrosion test of different steel welding joints is designed. By setting a liquid tank, support seat and clamping structure inside the tool set, and using an applied current voltage to offset the potential difference between the two metals, the test block is achieved simultaneously. Corrosion and metallographic structure development.
The tooling can realize multiple sets of comparison tests of different steel welded joints without disassembling the test equipment, improve the test efficiency, and simultaneously present the metallographic structure of different materials, solving the electrolytic corrosion test of different steel welded joints The problem of difficulty in testing in CICC.
Smart Images
Figure CN222481940U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electrolytic corrosion, in particular to a tool used for electrolytic corrosion test of dissimilar steel welding joints. Background Art
[0002] At present, boiler units are increasingly developing towards high parameters and large capacity, and dissimilar steel welded joints are increasingly widely used in boiler heating surface tubes. Metallographic testing, as a common means of boiler inspection and testing, plays a huge role in the safe operation and life assessment of boilers. Metallographic testing of dissimilar steel joints cannot be corroded using a single corrosive liquid because of the potential difference between the two metals.
[0003] Electrolytic corrosion technology is a method that uses the effects of current and voltage to electrolytically corrode metal immersed in an electrolytic corrosion solution to achieve the desired effect. Due to the potential difference between the two metals in the dissimilar steel welded joint, the metal with lower potential will always corrode earlier than the metal with higher potential, and the metallographic structure cannot be presented at the same time.
[0004] Therefore, a tooling for electrolytic corrosion testing of dissimilar steel welded joints is needed to solve the above problems. Utility Model Content
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0006] A tool for electrolytic corrosion testing of dissimilar steel welding joints, comprising a tool body and two clamping structures; a liquid tank with an opening upward is arranged inside the tool body, and a support seat is arranged on the bottom surface of the liquid tank; the two clamping structures are symmetrically arranged on both sides of the support seat; each clamping structure comprises a metal column, a guide hole, and a spring; the guide hole is arranged on the side wall of the tool body, one end of the metal column is arranged outside the liquid tank, and the other end is movably passed through the guide hole and arranged in the liquid tank; the spring is movably sleeved on the metal column, one end of the spring is fixedly connected to the metal column, and the other end is fixedly connected to the inner wall of the guide hole.
[0007] Furthermore, a drain hole is provided on the side wall of the tool body, and the drain hole is connected to the liquid tank and is used to discharge the liquid in the liquid tank out of the liquid tank.
[0008] Furthermore, the drain hole is detachably connected to the cock, and the cock is used to open or close the drain hole.
[0009] Furthermore, the clamping structure also includes a catheter, which is fixedly arranged on the inner wall of the liquid tank, and one end of the catheter is connected to the guide hole. A spring push plate is fixedly arranged on the outer periphery of the metal column, one end of the spring is fixedly connected to the spring push plate on the metal column, and the spring push plate is slidably accommodated in the interior of the catheter.
[0010] Furthermore, central axes of the metal column, the spring, and the conduit coincide with each other.
[0011] Furthermore, a clamping block is fixedly arranged at one end of the metal column arranged in the liquid tank, and a terminal is arranged at the other end of the metal column.
[0012] The end head is in a disc-shaped structure, the diameter of the end head is larger than the diameter of the guide hole, and the end head is used to prevent the metal column from falling into the liquid tank.
[0013] Furthermore, the metal column, the spring and the clamping block are made of copper.
[0014] Furthermore, the tool body and the support seat are made of corrosion-resistant materials.
[0015] Furthermore, the tool body and the support seat are made of polypropylene.
[0016] Furthermore, the cross section of the liquid tank is a rectangular structure.
[0017] Furthermore, the metal column is perpendicular to the side wall of the liquid tank.
[0018] Due to the adoption of the above technical solution, the technical progress achieved by the utility model compared with the prior art is as follows: 1. It has a liquid storage function and will not pollute the external area; 2. It can meet two different test methods of immersion and smearing; 3. It can be re-tested after completing the secondary polishing in the tooling without disassembly, thereby improving the test efficiency; 4. When conducting comparative tests on multiple groups of dissimilar steel joint test blocks under the same current or voltage parameters, multiple groups of comparative tests under the same electrolysis parameters can be achieved by connecting multiple fixtures for clamping test blocks in series or in parallel. 5. Providing electrical parameters to the dissimilar steel welding joints, using the applied current and voltage to offset the influence of the potential difference between the two metals, the metallographic structures of different materials on the test blocks can be presented simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0020] Figure 1 This is a schematic diagram of the structure of a tooling for electrolytic corrosion testing of dissimilar steel welded joints according to the utility model;
[0021] Figure 2 Another schematic diagram of a tooling for electrolytic corrosion testing of dissimilar steel welded joints according to the utility model;
[0022] Main component symbols
[0023] Tool body 11 Clamping structure 2 Liquid tank 111 Support seat 12 Metal column 21 Guide hole 22 Spring 23 Drain hole 110 Cock 112 Catheter 24 Spring push plate 213 Clamping block 211 Terminal 212 Test block 30
[0024] The following specific implementation will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0025] In order to make the technical personnel in the technical field better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by the technical personnel in the technical field of the utility model. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.
[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0027] See also Figure 1-2 The embodiment of the utility model provides a tool for electrolytic corrosion test of dissimilar steel welding joints, including a tool body 11 and two clamping structures 2; a liquid tank 111 with an upward opening is arranged inside the tool body, and a support seat 12 is arranged on the bottom surface of the liquid tank 111; the two clamping structures 2 are symmetrically arranged on both sides of the support seat 12; each clamping structure 2 includes a metal column 21, a guide hole 22, and a spring 23; the guide hole 22 is arranged on the side wall of the tool body 11, one end of the metal column 21 is arranged outside the liquid tank 111, and the other end is movably passed through the guide hole 22 and arranged in the liquid tank 111; the spring 23 is movably sleeved on the metal column 21, one end of the spring 23 is fixedly connected to the metal column 21, and the other end is fixedly connected to the inner wall of the guide hole 22. The clamping structure 2 is used to clamp the test block on the support seat 12, the support seat 12 is used to place the test block, and the metal column 21 is used to connect an external power supply to energize the test block.
[0028] Furthermore, a drain hole 110 is provided on the side wall of the tool body 11 . The drain hole 110 is connected to the liquid tank 111 and is used to discharge the liquid in the liquid tank 111 out of the liquid tank 111 .
[0029] Furthermore, the tooling for the electrolytic corrosion test of dissimilar steel welded joints also includes a cock 112 , the drain hole 110 is detachably connected to the cock 112 , and the cock 112 is used to open or close the drain hole 110 .
[0030] Furthermore, the clamping structure 2 also includes a conduit 24, which is fixedly arranged on the inner wall of the liquid tank 111, and one end of the conduit 24 is connected to the guide hole 22. A spring push plate 213 is fixedly arranged on the outer periphery of the metal column 21, and one end of the spring 23 is fixedly connected to the spring push plate 213 on the metal column 21, and the spring push plate 213 is slidably accommodated in the conduit 24.
[0031] Furthermore, the central axes of the metal column 21 , the spring 23 , and the conduit 24 coincide with each other.
[0032] Furthermore, a clamping block 211 is fixedly provided at one end of the metal column 21 disposed in the liquid tank 111 , and a terminal 212 is provided at the other end of the metal column 21 .
[0033] The end head 212 is in a disc-shaped structure. The diameter of the end head 212 is larger than the diameter of the guide hole 22 . The end head 212 is used to prevent the metal column 21 from escaping from the guide hole 22 and falling into the liquid tank 111 .
[0034] Furthermore, the metal column 21 , the spring and the clamping block 211 are made of copper.
[0035] Furthermore, the tool body 11 and the support seat 12 are made of corrosion-resistant materials.
[0036] Furthermore, the tool body 11 and the support seat 12 are made of polypropylene.
[0037] When the utility model is used, the two metal cylinders 21 on both sides of the support seat 12 are pulled outward at the same time, and the pre-treated heterogeneous steel welded joint is placed on the support seat 12 as a test block, and the two metal cylinders 21 are released with both hands so that the two metal cylinders 21 automatically clamp the test block 30 through the elastic force of the spring 23. Tighten the plug 112 so that the liquid does not flow out of the drain hole 110. Fix the wire of the external power supply on the metal cylinder 21, connect the alloy steel side to the positive pole of the power supply, and connect the stainless steel side to the negative pole of the power supply, so that the test block 30 is in and remains in a powered state. Provide electrical parameters to the heterogeneous steel welded joint to achieve the purpose of using external current and voltage to offset the effect of the potential difference between the two metals. In the immersion method, the electrolyte is poured into the liquid tank 111, and the test block 30 is immersed, so that a chemical reaction occurs in the immersed state, and the simultaneous corrosion of the metals on both sides of the heterogeneous steel welded joint and the metallographic structure imaging are achieved. In the smearing method, when the test block 30 is in an energized state, the electrolytic corrosion liquid is smeared on the surface of the test block to be tested, so as to achieve simultaneous corrosion and metallographic structure imaging of different metal materials in dissimilar steel welding joints. The smeared electrolytic corrosion liquid and the anhydrous ethanol solution for cleaning are contained in the tooling and will not contaminate the external non-test area.
[0038] If the test is unsuccessful, the immersed electrolytic corrosion liquid or waste liquid needs to be adjusted. When it is full, open the stopcock to drain the liquid. If the test is unsuccessful, the partially corroded surface to be tested can be re-polished without removing the test block 30, and the next test can be carried out again.
[0039] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.
Claims
1. A tool for electrolytic corrosion test of dissimilar steel welded joints, characterized by: It includes a tooling body and two clamping structures; a liquid tank with an opening upward is arranged inside the tooling body, and a support seat is arranged on the bottom surface of the liquid tank; the two clamping structures are symmetrically arranged on both sides of the support seat; each clamping structure includes a metal column, a guide hole, and a spring; the guide hole is arranged on the side wall of the tooling body, one end of the metal column is arranged outside the liquid tank, and the other end is movably passed through the guide hole and arranged in the liquid tank; the spring is movably sleeved on the metal column, one end of the spring is fixedly connected to the metal column, and the other end is fixedly connected to the inner wall of the guide hole.
2. The tooling for electrolytic corrosion testing of dissimilar steel welded joints according to claim 1, characterized in that: A drain hole is arranged on the side wall of the tool body, and the drain hole is communicated with the liquid tank and is used for discharging the liquid in the liquid tank out of the liquid tank.
3. The tooling for electrolytic corrosion testing of dissimilar steel welded joints according to claim 2, characterized in that: The drain hole is detachably connected to the cock, and the cock is used to open or close the drain hole.
4. The tooling for electrolytic corrosion testing of dissimilar steel welded joints as claimed in claim 3, characterized in that: The clamping structure also includes a catheter, which is fixedly arranged on the inner wall of the liquid tank, and one end of the catheter is connected to the guide hole. A spring push plate is fixedly arranged on the outer periphery of the metal column, one end of the spring is fixedly connected to the spring push plate on the metal column, and the spring push plate is slidably accommodated in the catheter.
5. The tooling for electrolytic corrosion testing of dissimilar steel welded joints as claimed in claim 4, characterized in that: A clamping block is fixedly arranged at one end of the metal column arranged in the liquid tank, and a terminal head is arranged at the other end of the metal column.
6. The tooling for electrolytic corrosion testing of dissimilar steel welded joints according to claim 5, characterized in that: The end head is in a disc-shaped structure, the diameter of the end head is larger than the diameter of the guide hole, and the end head is used to prevent the metal column from falling into the liquid tank.
7. The tooling for electrolytic corrosion testing of dissimilar steel welded joints according to claim 1, characterized in that: The tooling body and the support seat are made of corrosion-resistant materials.
8. The tooling for electrolytic corrosion testing of dissimilar steel welded joints according to claim 6, characterized in that: The metal cylinder, spring and clamping block are made of copper.