Device for simulating steel rail crevice corrosion

Abstract

The utility model relates to a steel rail crevice corrosion simulation device which comprises a corrosion solution container used for containing a corrosion solution; the multi-site integrated test block is arranged at the bottom of the corrosion solution container and is used for simulating a steel rail gap to form a working electrode; the auxiliary electrode is arranged on one side surface of the etchant solution container; the reference electrode is arranged on the other side surface of the etchant solution container; the working electrode, the auxiliary electrode and the reference electrode form a three-electrode system, and crevice corrosion behaviors of the steel rail under different corrosion conditions are analyzed by changing conditions of a corrosion solution. According to the utility model, by changing parameters such as components, concentration and temperature of the corrosion solution, factors influencing the corrosion of the steel rail crevice can be comprehensively researched under different corrosion conditions.

Description

Technical Field

[0001] This utility model relates to the field of metal corrosion technology, and in particular to a device for simulating rail crevice corrosion. Background Technology

[0002] During service, steel rails are subject to corrosion from various external environments due to prolonged exposure to the atmosphere. High temperatures and humidity, acid rain, urine corrosion, and polluted gases can all easily cause damage to rails. Crevice corrosion often occurs, especially in the gaps between the rail and fasteners, and between the rail and the ground. Although the amount of corrosion in localized crevice corrosion is small, it causes far more damage to the overall structural integrity of the material than general corrosion. If crevice corrosion is not effectively controlled, it will in most cases lead to thinning, perforation, and even failure and fracture of the rail material. Therefore, research on crevice corrosion of steel rails is essential. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model embodiment is to provide a device for simulating rail crevice corrosion.

[0004] A device for simulating rail crevice corrosion includes:

[0005] A container for corrosive solutions;

[0006] A multi-site integrated test block is placed at the bottom of the corrosive solution container to simulate rail gaps and form a working electrode;

[0007] An auxiliary electrode is disposed on one side of the corrosive solution container;

[0008] The reference electrode is located on the other side of the corrosive solution container;

[0009] The working electrode, auxiliary electrode, and reference electrode form a three-electrode system, and the crevice corrosion behavior of the rail under different corrosion conditions is analyzed by changing the corrosion solution conditions.

[0010] Preferably, a predetermined number of rail sample bundles are encapsulated with epoxy resin to form a multi-site integrated test block with the cross-sections of the rail sample bundles arranged in a regular manner.

[0011] Preferably, each rail sample bundle is covered with a resin sheet, and a gap is formed between the rail sample bundle and the resin sheet.

[0012] Preferably, the width between each resin sheet is different.

[0013] Preferably, the different gap widths formed between the resin sheets of different widths and the rail sample bundle are all separated to form a unit sample.

[0014] Preferably, each unit sample is connected to a copper wire to obtain independent electrochemical parameters under different gap widths.

[0015] According to the specific embodiments provided by this utility model, the following technical effects are disclosed:

[0016] This invention relates to a device for simulating rail crevice corrosion. Compared with the prior art, this invention can comprehensively study the factors affecting rail crevice corrosion under different corrosion conditions by changing the composition, concentration, temperature and other parameters of the corrosive solution.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the gap structure between the rail foot and the fastener provided by this utility model;

[0020] Figure 2 A schematic diagram of a device for simulating rail crevice corrosion provided by this utility model;

[0021] Figure 3 A cross-sectional view of the simulated rail crevice corrosion device provided by this utility model.

[0022] Symbol explanation:

[0023] 1. Corrosion solution container; 2. Corrosion solution container lid; 3. Reference electrode; 4. Auxiliary electrode; 5. Working electrode; 6. Copper wire; 7. Pressing sheet separating the unit sample; 8. Unit sample. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please see Figure 1-3 A device for simulating rail crevice corrosion, comprising:

[0028] Corrosive solution container 1, used to hold the corrosive solution;

[0029] A multi-site integrated test block is set at the bottom of the corrosion solution container 1 to simulate the gaps in the rail and form the working electrode 5;

[0030] The auxiliary electrode 4 is disposed on one side of the corrosive solution container 1;

[0031] Reference electrode 3 is disposed on the other side of the corrosion solution container 1;

[0032] The working electrode 5, the auxiliary electrode 4, and the reference electrode 3 form a three-electrode system. By changing the corrosive solution conditions, the crevice corrosion behavior of the rail under different corrosion conditions can be analyzed.

[0033] It should be noted that a predetermined number of rail sample bundles are encapsulated with epoxy resin to form a multi-site integrated test block with a regular cross-section arrangement of the rail sample bundles.

[0034] Each rail sample bundle is covered with a resin sheet, forming a gap between the rail sample bundle and the resin sheet. The width between each resin sheet is different, and the different gap widths formed between the resin sheets of different widths and the rail sample bundles are separated individually to form a unit sample 8.

[0035] To prevent each unit sample 8 from being affected by the corrosion products of surrounding samples, each step on the lower surface of the resin sheet is individually separated, and each unit sample is connected to a copper wire 6 to obtain independent electrochemical parameters under different crevice widths. Then, using this crevice corrosion apparatus system, electrochemical tests such as potentiodynamic polarization, constant potential polarization, constant current polarization, electrochemical impedance, and electrochemical noise are performed to obtain various electrochemical parameters and characterize the crevice corrosion behavior of the rail.

[0036] This invention allows for a comprehensive study of factors influencing rail crevice corrosion under different corrosion conditions by changing parameters such as the composition, concentration, and temperature of the corrosive solution.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A device for simulating rail crevice corrosion, characterized in that, include: A container for corrosive solutions; A multi-site integrated test block is placed at the bottom of the corrosive solution container to simulate rail gaps and form a working electrode; An auxiliary electrode is disposed on one side of the corrosive solution container; The reference electrode is located on the other side of the corrosive solution container; The working electrode, auxiliary electrode, and reference electrode form a three-electrode system, and the crevice corrosion behavior of the rail under different corrosion conditions is analyzed by changing the corrosion solution conditions.

2. The device for simulating rail crevice corrosion according to claim 1, characterized in that, A predetermined number of rail sample bundles are encapsulated with epoxy resin to form a multi-site integrated test block with a regular cross-section arrangement of the rail sample bundles.

3. The device for simulating rail crevice corrosion according to claim 2, characterized in that, Each rail sample bundle is covered with a resin sheet, forming a gap between the rail sample bundle and the resin sheet.

4. The device for simulating rail crevice corrosion according to claim 3, characterized in that, The width between each resin sheet is different.

5. The device for simulating rail crevice corrosion according to claim 4, characterized in that, Different gap widths formed between resin sheets of different widths and rail sample bundles were individually separated to form unit samples.

6. The device for simulating rail crevice corrosion according to claim 5, characterized in that, Each unit sample is connected to a copper wire to obtain independent electrochemical parameters at different gap widths.

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