Device for simulating steel rail crevice corrosion

Abstract

The invention 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 invention, the factors influencing the corrosion of the steel rail crevice can be comprehensively researched under different corrosion conditions by changing the components, concentration, temperature and other parameters of the corrosion solution.

Description

Technical Field

[0001] The present invention relates to the technical field of metal corrosion, and particularly to a device for simulating crevice corrosion of rail. Background Art

[0002] During the service process of rails, due to being exposed to the atmospheric environment for a long time, they will be eroded by various external environments. High temperature and humidity, acid rain scouring, urine corrosion, and polluted gases can easily cause damage to the rails. Especially, crevices are formed between the rails and fasteners, and between the rails and the ground, where crevice corrosion often occurs. Although the amount of local crevice corrosion of the rails is very small, the damage to the overall structural integrity of the material is much more serious than general corrosion. If crevice corrosion cannot be effectively inhibited, in most cases, it will cause corrosion thinning, perforation, and even failure fracture of the rail material. Therefore, it is very necessary to study the crevice corrosion of rails. Summary of the Invention

[0003] To solve the above problems, an object of an embodiment of the present invention is to provide a device for simulating crevice corrosion of rail.

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

[0005] A corrosion solution container for placing a corrosion solution;

[0006] A multi-site integrated test block is arranged at the bottom of the corrosion solution container for simulating the crevice of the rail to form a working electrode;

[0007] An auxiliary electrode is arranged on one side surface of the corrosion solution container;

[0008] A reference electrode is arranged on the other side surface of the corrosion solution container;

[0009] The working electrode, the auxiliary electrode, and the 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 preset number of rail specimens are fixed and encapsulated with epoxy resin so that the cross-sections of the rail specimens are regularly arranged to form a multi-site integrated test block.

[0011] Preferably, each rail specimen is covered with a resin thin sheet, and a crevice is formed between the rail specimen and the resin thin sheet.

[0012] Preferably, the widths between each resin thin sheet are different.

[0013] Preferably, different crevice widths formed between the resin thin sheets with different widths and the rail specimens are separately separated to form unit specimens.

[0014] Preferably, each unit specimen is connected to a copper wire for obtaining independent electrochemical parameters at different gap widths.

[0015] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0016] The present invention relates to a device for simulating rail gap corrosion. Compared with the prior art, by changing parameters such as the composition, concentration, and temperature of the corrosion solution, the present invention can comprehensively study the factors affecting rail gap corrosion under different corrosion conditions.

[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically given below, and detailed descriptions are made in conjunction with the accompanying drawings as follows. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Schematic diagram of the gap structure between the rail foot and the fastener provided by the present invention;

[0020] Figure 2 Schematic diagram of a device for simulating rail gap corrosion provided by the present invention;

[0021] Figure 3 Cross-sectional view of the device for simulating rail gap corrosion provided by the present invention.

[0022] Symbol Explanation:

[0023] 1. Corrosion solution container; 2. Corrosion solution container cover; 3. Reference electrode; 4. Auxiliary electrode; 5. Working electrode; 6. Copper wire; 7. Pressing piece for separating unit specimens; 8. Unit specimen. Detailed Embodiments

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0025] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0026] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Please refer to Figures 1 - 3 , an apparatus for simulating crevice corrosion of rail, comprising:

[0028] A corrosion solution container 1 for placing a corrosion solution;

[0029] A multi-site integrated test block, disposed at the bottom of the corrosion solution container 1, for simulating the rail crevice to form a working electrode 5;

[0030] An auxiliary electrode 4, disposed on one side of the corrosion solution container 1;

[0031] A reference electrode 3, 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, and the crevice corrosion behavior of the rail under different corrosion conditions is analyzed by changing the corrosion solution conditions.

[0033] It should be noted that a preset number of rail specimens are shaped and encapsulated with epoxy resin so that the cross-sections of the rail specimens are regularly arranged to form a multi-site integrated test block.

[0034] Each rail specimen is covered with a resin sheet, and a crevice is formed between the rail specimen and the resin sheet. The widths between each resin sheet are different, and the different crevice widths formed between the resin sheets of different widths and the rail specimens are separately separated to form a unit specimen 8.

[0035] In order to make each unit specimen 8 not affected by the corrosion products of the surrounding specimens, each step on the lower surface of the resin sheet is separately separated, and a copper wire 6 is connected to each unit specimen to obtain independent electrochemical parameters at different crevice widths. Then, using this crevice corrosion device system, electrochemical tests such as potentiodynamic polarization, potentiostatic polarization, galvanostatic polarization, electrochemical impedance, and electrochemical noise are carried out to obtain various electrochemical parameters to characterize the crevice corrosion behavior of the rail.

[0036] By changing parameters such as the composition, concentration, and temperature of the corrosion solution, the present invention can comprehensively study the factors affecting the crevice corrosion of the rail under different corrosion conditions.

[0037] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A device for simulating the crevice corrosion of steel rails, characterized in that, Comprising: An etching solution container for holding an etching solution; A multi-site integrated test block disposed at the bottom of the etching solution container for simulating a rail gap to form a working electrode; An auxiliary electrode disposed on one side of the etching solution container; A reference electrode disposed on the other side of the etching solution container; The working electrode, the auxiliary electrode and the reference electrode form a three-electrode system, and the crevice corrosion behavior of the rail under different corrosion conditions is analyzed by changing the etching solution conditions.

2. The simulated rail crevice corrosion device according to claim 1, wherein A preset number of rail specimens are shaped and encapsulated with epoxy resin so that the cross-sections of the rail specimens are regularly arranged to form a multi-site integrated test block.

3. The simulated rail crevice corrosion device according to claim 2, wherein Each rail specimen is covered with a resin thin sheet, and a gap is formed between the rail specimen and the resin thin sheet.

4. The simulated rail crevice corrosion device according to claim 3, wherein The widths between each pair of resin thin sheets are different.

5. The simulated steel rail crevice corrosion device according to claim 4, characterized in that, The different gap widths formed between the resin thin sheets of different widths and the rail specimens are separately separated to form unit specimens.

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

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