阅读说明：本技术 一种检测不锈钢晶间腐蚀敏感性的电化学装置及方法 (Electrochemical device and method for detecting stainless steel intercrystalline corrosion sensitivity ) 是由 谭晓蒙 陈浩 张涛 郑建军 谢利明 郭心爱 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种检测不锈钢晶间腐蚀敏感性的电化学装置及方法,包括有用于对待测工件施加作用力并提供检测环境的试样加载装置,通过导管与试样加载装置连接的循环加热装置,用于检测待测工件受到作用力时的电化学信号的电化学工作站,试样加载装置包括有顶部具有开口结构的箱体,箱体的内部形成腐蚀反应槽,腐蚀反应槽内部一侧的槽壁上固定连接有用于夹持待测工件的第一板夹,另一侧安装有可沿水平方向往复运动的第二板夹。本发明中的电化学装置不仅实现了瓦楞形不锈钢沿瓦楞折线方向受到压力、沿垂直于瓦楞折线方向受到拉力或压力等作用力条件下晶间腐蚀敏感性检测,而且整个检测过程更加简便,操作更为方便,最后得出的检测结果更加准确。(The invention discloses an electrochemical device and a method for detecting stainless steel intercrystalline corrosion sensitivity, which comprises a sample loading device, a circulating heating device and an electrochemical workstation, wherein the sample loading device is used for applying acting force on a workpiece to be detected and providing a detection environment, the circulating heating device is connected with the sample loading device through a guide pipe, the electrochemical workstation is used for detecting an electrochemical signal when the workpiece to be detected is subjected to the acting force, the sample loading device comprises a box body, the top of the box body is provided with an opening structure, a corrosion reaction tank is formed in the box body, a first plate clamp used for clamping the workpiece to be detected is fixedly connected to the wall of one side in the corrosion reaction tank, and a second plate clamp capable of reciprocating in the horizontal direction is installed on the other side. The electrochemical device provided by the invention realizes the detection of the intergranular corrosion sensitivity of the corrugated stainless steel under the conditions that the corrugated stainless steel is stressed in the direction of the corrugated line and is stressed in the direction perpendicular to the corrugated line under the action forces of tension or pressure and the like, the whole detection process is simpler and more convenient, the operation is more convenient, and the finally obtained detection result is more accurate.)

1. An electrochemical device for detecting the sensitivity of stainless steel intergranular corrosion comprises a sample loading device, a circulating heating device and an electrochemical workstation (14), wherein the sample loading device is used for applying an acting force on a workpiece (9) to be detected and providing a detection environment, the circulating heating device is connected with the sample loading device through a guide pipe, the electrochemical workstation is used for detecting an electrochemical signal when the workpiece (9) to be detected is subjected to the acting force, the electrochemical workstation is characterized in that the sample loading device comprises a box body (2) the top of which is provided with an opening structure, a corrosion reaction tank (3) is formed inside the box body (2), a first plate clamp (1) used for clamping the workpiece (9) to be detected is fixedly connected onto the wall of one side inside the corrosion reaction tank (3), a second plate clamp (11) capable of reciprocating along the horizontal direction is arranged on the other side, a loading block (4) which applies the acting force to the workpiece (9) to be detected along the vertical direction is arranged in the box body (2) and above the workpiece (9) to be detected, an auxiliary electrode (5) and a reference electrode (10) are arranged on the inner wall of the box body (2), and the auxiliary electrode (5) and the reference electrode (10) are respectively in signal connection with the electrochemical workstation (14) through leads.

2. The electrochemical device for detecting the sensitivity of the stainless steel to the intergranular corrosion according to claim 1, wherein a motor support (16) is fixedly connected to the outer wall of the box body (2), a stepping motor (15) is installed on the upper end face of the motor support (16), a transmission gear (13) is connected to the output end of the stepping motor (15) in a driving manner, a sliding strip (12) arranged along the horizontal direction is connected to one side of the second plate clamp (11), and one end of the sliding strip (12) extends outwards to penetrate through the box body (2) and then is connected with meshing teeth meshed with the transmission gear (13).

3. The electrochemical device for detecting the sensitivity of stainless steel to intergranular corrosion according to claim 1 or 2, wherein a top cover bracket (6) is installed at the top of the box body (2), a cylinder (7) is fixedly installed on the top cover bracket (6), a connecting rod (8) is connected to the piston end of the cylinder (7), and the bottom of the connecting rod (8) extends downwards into the box body (2) and then is connected with the loading block (4).

4. The electrochemical device for detecting the sensitivity of the stainless steel to the intergranular corrosion according to claim 3, wherein a guide groove (17) for the workpiece (9) to be detected to slide along the horizontal direction is formed on the bottom of the groove inside the corrosion reaction groove (3).

5. The electrochemical device for detecting the sensitivity of the stainless steel to the intergranular corrosion according to claim 4, wherein the circulating heating device comprises a water bath (21), a solution tank (19) and a heater (20) are arranged inside the water bath (21), the solution tank (19) is connected with a water inlet close to the bottom end of the corrosion reaction tank (3) through a water inlet pipe (18), a water outlet pipe (23) is connected between the solution tank (19) and a water outlet close to the top end of the corrosion reaction tank (3), and the water inlet pipe (18) and the water outlet pipe (23) are both connected with a high-precision peristaltic pump (22).

6. A method for detecting the sensitivity of stainless steel to intergranular corrosion by using the electrochemical device of claim 5, wherein the method comprises the following steps: putting a workpiece (9) to be measured into a guide groove (17) in a box body (2), connecting the workpiece to be measured to an electrochemical workstation (14) through a lead, starting a high-precision peristaltic pump (22) to start working, conveying the heated electrolyte into a corrosion reaction tank (3) through a water inlet pipe (18) until the liquid level in the corrosion reaction tank (3) overflows the workpiece (9) to be measured and then flows out through a water outlet pipe (23), keeping the circulation flow of the electrolyte, starting a stepping motor (15), matching a transmission gear (13) with a sliding strip (12) to ensure that a second plate clamp (11) clamps the workpiece (9) to be measured to stretch outwards or compress towards the center, simultaneously starting an air cylinder (7), pushing a loading block (4) to apply vertical acting force to the workpiece (9) to be measured through a connecting rod (8), and recording the voltage value or current value near the workpiece (9) to be measured in a solution medium in real time by an auxiliary electrode (5) and a reference electrode (10), and then the pressure of the workpiece (9) to be tested in the corrugated line direction and the change of the stainless steel intercrystalline corrosion sensitivity under the corrugated line stretching or compressing condition are analyzed according to the voltage or current value by selecting a corresponding program in the software.

Technical Field

The invention relates to the technical field of electrochemistry, in particular to an electrochemical device and method for detecting stainless steel intercrystalline corrosion sensitivity.

Background

Corrugated stainless steel is often used in corrosion-resistant places in the fields of building materials, product equipment and the like, and if intergranular corrosion occurs in the stainless steel, the performance of the stainless steel material can be reduced, so that unnecessary potential safety hazards are caused. However, according to the related regulations of the method, the steps and the equipment for testing the stainless steel intercrystalline corrosion in GB/T4334-.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one object of the present invention is to provide an electrochemical device and method for detecting inter-crystalline corrosion sensitivity of stainless steel, which realizes inter-crystalline corrosion sensitivity detection of corrugated stainless steel under the condition of acting forces in different directions, and improves the accuracy of detection.

The invention provides an electrochemical device for detecting the sensitivity of stainless steel intergranular corrosion, which comprises a sample loading device, a circulating heating device and a detection device, wherein the sample loading device is used for applying acting force on a workpiece to be detected and providing a detection environment, the circulating heating device is connected with the sample loading device through a conduit, an electrochemical workstation for detecting electrochemical signals when a workpiece to be detected receives acting force, a sample loading device comprises a box body with the top provided with an opening structure, a corrosion reaction groove is formed inside the box body, a first plate clamp fixedly connected with the groove wall on one side inside the corrosion reaction groove and used for clamping the workpiece to be detected, a second plate clamp capable of moving horizontally and in a reciprocating mode is installed on the other side, a loading block applying the acting force to the workpiece to be detected along the vertical direction is arranged above the workpiece to be detected in the box body, an auxiliary electrode and a reference electrode are arranged on the inner wall of the box body, and the auxiliary electrode and the reference electrode are respectively connected with the electrochemical workstation through leads.

Preferably, fixedly connected with motor support on the outer wall of box, step motor is installed to motor support's up end, and step motor's output drive is connected with drive gear, and one side of second plate clamp is connected with the sliding strip that sets up along the horizontal direction, and the one end of sliding strip outwards extends to wear out and is connected with the meshing tooth that meshes mutually with drive gear behind the box.

Preferably, a top cover support is installed at the top of the box body, a cylinder is fixedly installed on the top cover support, a connecting rod is connected to the piston end of the cylinder, and the bottom of the connecting rod extends downwards to the inside of the box body and then is connected with the loading block.

Preferably, a guide groove for the workpiece to be detected to slide along the horizontal direction is formed in the bottom of the inner side of the corrosion reaction groove.

Preferably, the circulation heating device comprises a water bath tank, a solution tank and a heater are arranged inside the water bath tank, the solution tank is connected with a water inlet close to the bottom end of the corrosion reaction tank through a water inlet pipe, a water outlet pipe is connected between a water outlet close to the top end of the solution tank and the corrosion reaction tank, and high-precision peristaltic pumps are connected to the water inlet pipe and the water outlet pipe.

The invention also provides a method for detecting the stainless steel intercrystalline corrosion sensitivity by adopting the electrochemical device, which comprises the following steps: putting a workpiece to be detected into a guide groove in a box body, connecting the workpiece to be detected to an electrochemical workstation through a lead, starting a high-precision peristaltic pump to start working, conveying the heated electrolyte into a corrosion reaction tank through a water inlet pipe until the liquid level in the corrosion reaction tank overflows the workpiece to be detected, flowing out through a water outlet pipe, keeping the electrolyte circularly flowing, starting a stepping motor, enabling a transmission gear to be matched with a sliding strip to enable a second plate clamp to clamp the workpiece to be detected to stretch outwards or compress towards the center, simultaneously starting an air cylinder, pushing a loading block to apply vertical acting force to the workpiece to be detected through a connecting rod, recording a voltage value or a current value near the workpiece to be detected in a solution medium in real time by an auxiliary electrode and a reference electrode, transmitting the voltage value or the current value to software matched with the electrochemical workstation in a computer, analyzing the pressure of the corrugated line direction of the workpiece to be detected by selecting a corresponding program in the software on the voltage or current value, and analyzing the stainless steel crystal under the corrugated line stretching or compressing condition of the workpiece to be detected by the corrugated line Inter-corrosion susceptibility.

The beneficial effects of the invention are as follows: the electrochemical device provided by the invention realizes the detection of the intergranular corrosion sensitivity of the corrugated stainless steel under the conditions that the corrugated stainless steel is stressed in the direction of the corrugated line and is stressed in the direction perpendicular to the corrugated line under the action forces of tension or pressure and the like, the whole detection process is simpler and more convenient, the operation is more convenient, and the finally obtained detection result is more accurate.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall apparatus of the present invention;

fig. 2 is a top view of the entire apparatus of the present invention.

In the figure: 1. a first board clamp; 2. a box body; 3. corroding the reaction tank; 4. loading a block; 5. an auxiliary electrode; 6. a top cover bracket; 7. a cylinder; 8. a connecting rod; 9. a workpiece to be tested; 10. a reference electrode; 11. a second plate clip; 12. a slide bar; 13. a transmission gear; 14. an electrochemical workstation; 15. a stepping motor; 16. a motor bracket; 17. a guide groove; 18. a water inlet pipe; 19. a solution tank; 20. a heater; 21. a water bath; 22. a high precision peristaltic pump; 23. and (5) discharging a water pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The embodiment discloses an electrochemical device for detecting stainless steel intergranular corrosion sensitivity, as shown in fig. 1, comprising a sample loading device for applying an acting force on a workpiece 9 to be detected and providing a detection environment, a circulating heating device connected with the sample loading device through a conduit, and an electrochemical workstation 14 for detecting an electrochemical signal when the workpiece 9 to be detected is subjected to the acting force, wherein the sample loading device comprises a box body 2 with an opening structure at the top, a corrosion reaction tank 3 is formed inside the box body 2, a first plate clamp 1 for clamping the workpiece 9 to be detected is fixedly connected to the wall of one side inside the corrosion reaction tank 3, a second plate clamp 11 capable of reciprocating along the horizontal direction is installed at the other side, the workpiece 9 to be detected is clamped firmly inside the corrosion reaction tank 3 through the first plate clamp 1 and the second plate clamp 11, and after an electrolyte is injected into the corrosion reaction tank 3, the second plate clamp 11 moves in the horizontal direction to apply acting force to the workpiece 9 to be tested in the direction of a corrugated line, meanwhile, a loading block 4 applying acting force to the workpiece 9 to be tested in the vertical direction is arranged above the workpiece 9 to be tested in the box body 2, acting force perpendicular to the direction of the corrugated line is applied to the workpiece 9 to be tested through movement of the loading block 4 in the vertical direction, an auxiliary electrode 5 and a reference electrode 10 are arranged on the inner wall of the box body 2, the auxiliary electrode 5 and the reference electrode 10 are in signal connection with the electrochemical workstation 14 through leads respectively, and software in the electrochemical workstation 14 detects electrochemical signals when the workpiece 9 to be tested is subjected to acting force in different directions.

Specifically, a motor bracket 16 is fixedly connected to the outer wall of the box body 2, a stepping motor 15 is installed on the upper end face of the motor bracket 16, an output end of the stepping motor 15 is connected with a transmission gear 13 in a driving manner, one side of the second plate clamp 11 is connected with a sliding bar 12 arranged along the horizontal direction, one end of the sliding bar 12 extends outwards to penetrate through the box body 2 and is connected with a meshing gear meshed with the transmission gear 13, the transmission gear 13 is driven to rotate by the stepping motor 15, and the sliding bar 12 positioned outside the box body 2 is connected with the meshing gear meshed with the transmission gear 13, so that the sliding bar 12 is driven to move along the horizontal direction, and further the second plate clamp 11 is driven to move along the horizontal direction, the second plate clamp 11 clamps the workpiece 9 to be measured, and stretches outwards or compresses towards the center, it should be noted that the sliding bar 12 is connected with the inner wall of the box body 2 in a sliding manner, and the two have certain sealing performance, the electrolyte leakage in the corrosion reaction tank 3 is avoided.

Further, top cap support 6 is installed at the top of box 2, and fixed mounting has cylinder 7 on top cap support 6, and the piston end of cylinder 7 is connected with connecting rod 8, and the bottom of connecting rod 8 downwardly extending links to each other with loading block 4 after box 2 is inside, and it surveys work piece 9 application effort to the area along vertical direction to drive loading block 4 through cylinder 7.

As a preferred embodiment, a guide groove 17 for the workpiece 9 to be measured to slide along the horizontal direction is formed in the bottom of the inner side of the corrosion reaction tank 3, the second plate clamp 11 clamps the workpiece 9 to be measured to move along the horizontal direction in the guide groove 17, and the loading block 4 cannot apply an acting force to the workpiece 9 to be measured due to the fact that the workpiece 9 to be measured is placed to deviate in the horizontal direction.

The circulation heating device in the embodiment comprises a water bath 21, a solution tank 19 and a heater 20 are arranged inside the water bath 21, water inside the water bath 21 is heated through the heater 20, electrolyte in the solution tank 19 is heated in a water bath heating mode, the solution tank 19 is connected with a water inlet close to the bottom end of the corrosion reaction tank 3 through a water inlet pipe 18, a water outlet pipe 23 is connected between a water outlet close to the top of the solution tank 19 and the corrosion reaction tank 3, the heated electrolyte enters the corrosion reaction tank 3 through the water inlet pipe 18 and flows back to the solution tank 19 through the water outlet pipe 23, high-precision peristaltic pumps 22 are connected to the water inlet pipe 18 and the water outlet pipe 23, and the electrolyte is driven to circulate through the work of the high-precision peristaltic pumps 22.

The invention provides an electrochemical device for detecting stainless steel intercrystalline corrosion sensitivity, which is used for detecting a workpiece 9 to be detected, and comprises the following components in part by weight: the workpiece 9 to be measured is placed into a guide groove 17 in the box body 2 through an opening at the top of the box body 2 and is connected to an electrochemical workstation 14 through a lead, a high-precision peristaltic pump 22 is started to work, the high-precision peristaltic pump 22 transports heated electrolyte into a corrosion reaction tank 3 through a water inlet pipe 18 until the liquid level in the corrosion reaction tank 3 overflows the workpiece 9 to be measured and then flows out through a water outlet pipe 23, the electrolyte keeps circulating flow in the corrosion reaction tank 3 and a solution tank 19, a stepping motor 15 is started, a transmission gear 13 is matched with a sliding strip 12 to enable a second plate clamp 11 to clamp the workpiece 9 to be measured to stretch outwards or compress towards the center, meanwhile, an air cylinder 7 is started, a loading block 4 is pushed by a connecting rod 8 to apply vertical acting force on the workpiece 9 to be measured, and the voltage value or the current value near the workpiece 9 to be measured in the solution medium is recorded in real time through an auxiliary electrode 5 and a reference electrode 10, and then the voltage or current value is transmitted to software matched with the electrochemical workstation 14 in the computer, and the detected value of the voltage or current value can be processed by selecting a corresponding program in the software and output, such as a current-time curve, a voltage-time curve, a polarization curve, an electrochemical impedance spectrum, electrochemical noise and the like, so as to analyze the pressure of the workpiece to be detected in the corrugated line direction and the change of the stainless steel intercrystalline corrosion sensitivity under the corrugated line stretching or compressing condition.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.