Metal material fatigue testing device for corrosion environment

Abstract

The utility model discloses a metal material fatigue testing device for a corrosion environment. The metal material fatigue testing device comprises an upper supporting cylinder, a lower supporting base, an upper fixing piece, a lower fixing piece, a circulating water pump, an overflow valve, a liquid box and a corrosion vessel, the bottom end of the lower fixing piece is connected with the lower supporting base, and the upper portion of the lower fixing piece penetrates through the lower end face of the corrosion vessel. The top end of the upper fixing piece is connected with the upper supporting cylinder through an internal thread cylindrical pin, and the lower part of the upper fixing piece penetrates through a sealing cover of the corrosion vessel; a lower short pin and an upper short pin are respectively arranged at the upper part of the lower fixing piece and the lower part of the upper fixing piece; the overflow valve, the circulating water pump and the liquid box are sequentially communicated through the sleeve; and the overflow valve and the liquid box are communicated with the corrosion vessel. The corrosion environment sealing stability durability is good, corrosion solution injection and drainage rotation is simple, the electrochemical corrosion environment can be achieved, it can be guaranteed that metal materials are stably tested under the dual effects of electrochemical corrosion and mechanics, and the testing accuracy and safety are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fatigue testing device, specifically to a metal material fatigue testing device for corrosion environment. BACKGROUND

[0002] In the current material testing field, in order to test the fatigue performance of metal, the test is usually carried out by fixing the sample on the two holding mechanisms of the fatigue testing machine to reciprocating tension and compression. The fatigue testing machine fixing device is usually composed of base, stand, holding mechanism, fastener and other elements and basically composed of metal material, such as carbon steel or aluminum alloy, and adopts basic surface treatment technology, such as galvanizing or painting, to provide a certain degree of corrosion protection. If you want to study the fatigue performance of metal in a corrosive environment, you need to create a stable and long-lasting corrosive environment while testing the fatigue. The current corrosion fatigue test is divided into two types. One is to corrode the sample to be tested to a certain extent and then directly install it on the fatigue testing machine for testing, which cannot simulate the actual working condition of simultaneous corrosion and fatigue of metal material. The other is to directly spray the corrosion solution while testing the fatigue, which has the problems of uneven corrosion, uncontrollable corrosion working condition parameters and easy corrosion of testing machine parts. SUMMARY

[0003] In view of the problems existing in the prior art, the utility model provides a metal material fatigue testing device for corrosion environment, which has good corrosion environment sealing stability and durability, convenient corrosion solution injection and discharge, and multiple functions.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: including upper support cylinder and lower support base, the top surface of upper support cylinder is connected with the test machine series connection platform, further including upper fixing part, lower fixing part, circulating water pump, overflow valve, liquid tank and corrosion vessel, the corrosion vessel is the cylinder structure with sealing cover on the top, and the electrode hole is formed in the sealing cover; the bottom end of lower fixing part is connected with the top surface of lower support base, and the upper part of lower fixing part penetrates the lower end surface of corrosion vessel; the top end of upper fixing part is connected with the bottom surface of upper support cylinder through internal thread cylindrical pin, and the lower part of upper fixing part penetrates the sealing cover of corrosion vessel; the upper part of lower fixing part and the lower part of upper fixing part are respectively provided with lower short pin and upper short pin for connecting the two ends of sample; the overflow valve, circulating water pump and liquid tank are sequentially communicated through the sleeve, the overflow valve is communicated with the bottom surface of corrosion vessel, and the liquid tank is communicated with the upper part of side surface of corrosion vessel.

[0005] Further, the lower end surface of the lower fixing part and the sealing cover of the upper fixing part are both sealed and connected through the sealing ring.

[0006] Further, the lower fixing member is externally provided with a sleeve below the corrosion vessel, and the upper and lower sections of the sleeve are connected to the bottom surface of the corrosion vessel and the top surface of the lower supporting base respectively.

[0007] Further, the upper short pin is made of chrome-plated carbon steel, which guarantees the corrosion resistance and good electrical conductivity.

[0008] Further, the lower short pin is made of glass fiber reinforced epoxy resin composite material, which has certain tensile strength and corrosion resistance and is suitable for electrochemical corrosion environment, and can avoid the mutual conduction between metal materials.

[0009] Further, the surface of the upper supporting cylinder is sprayed with an anti-corrosion coating to avoid the adverse effects of the corrosion gas produced by electrochemistry.

[0010] Further, the upper and lower fixing members are made of glass fiber reinforced epoxy resin composite material and are subjected to frosted treatment on the surface, have corrosion resistance and impact resistance, are not affected in a long-term corrosion environment, and have no electrical conductivity and are suitable for electrochemical corrosion scenes.

[0011] Compared with the prior art, the corrosion environment is sealed stably and durably, the corrosion solution injection and discharge are simple to change, the electrochemical corrosion environment is realized, the metal material can be stably tested under the dual action of electrochemical corrosion and mechanics, and the accuracy and safety of the test are guaranteed; the structure of the utility model is simple, convenient to operate, convenient to install and simple to disassemble, can be used in conventional corrosion environment and electrochemical corrosion environment; the structure materials of the utility model are subjected to corrosion prevention treatment, and the corrosion fatigue test of different metal materials under the influence of different liquid media can be simulated. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a sectional view of the utility model structure;

[0013] Fig. 2 It is a corrosion vessel external connection structure schematic view of the utility model;

[0014] Fig. 3 It is a perspective view of the utility model;

[0015] In the drawing: 0, metal sample; 1, upper supporting cylinder; 2, internally threaded cylindrical pin; 3, lower supporting base; 4, upper fixing member; 5, corrosion vessel; 6, upper short pin; 7, lower fixing member; 8, lower short pin; 9, sleeve; 10, sleeve pipe; 11, circulating water pump; 12, test machine series connection platform; 13, overflow valve; 14, liquid tank; 15, sealing ring. DETAILED DESCRIPTION

[0016] The utility model will be further described below with reference to the drawings.

[0017] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] As Figs. 1 to 3 The utility model provides a technical scheme: including upper support cylinder 1, lower support base 3, upper fixed part 4, lower fixed part 7, circulating water pump 11, overflow valve 13, liquid tank 14 and corrosion utensil 5, corrosion utensil 5 is the cylinder structure with the sealing cover being arranged at the top, and electrode hole is formed in the sealing cover.

[0019] The bottom of lower fixed part 7 is connected with the top surface of lower support base 3, and the upper part of lower fixed part 7 passes through the lower end surface of corrosion utensil 5;Lower fixed part 7 and the lower end surface of corrosion utensil 5 are sealedly connected through sealing ring 15, so as to ensure that the solution in corrosion utensil 5 does not leak;The part below corrosion utensil 5 of lower fixed part 7 is externally provided with sleeve 9, and the upper and lower two sections of sleeve 9 are connected with the bottom surface of corrosion utensil 5 and the top surface of lower support base 3 respectively, and sleeve 9 is additionally arranged to ensure the support strength of corrosion utensil 5.

[0020] The top end of upper fixed part 4 is connected with the bottom surface of upper support cylinder 1 through internal thread cylindrical pin 2, the top surface of upper support cylinder 1 is connected with test machine series connection platform 12, the lower part of upper fixed part 4 passes through the sealing cover of corrosion utensil 5, and upper fixed part 4 and the sealing cover of corrosion utensil 5 are sealedly connected through sealing ring 15;The upper part of lower fixed part 7 and the lower part of upper fixed part 4 are respectively provided with lower short pin 8 and upper short pin 6 for connecting the two ends of the sample.

[0021] Overflow valve 13, circulating water pump 11 and liquid tank 14 are sequentially communicated through sleeve pipe 10, overflow valve 13 is communicated with the bottom surface of corrosion utensil 5, liquid tank 14 is communicated with the upper part of the side surface of corrosion utensil 5, and a liquid discharge port is arranged below liquid tank 14, so as to facilitate the discharge and replacement of liquid;Circulating water pump 11 adopts a miniature direct-current water pump, the internal pressure of corrosion utensil 5 can be adjusted by changing the rotating speed of circulating water pump 11 and overflow valve 13, and corrosion utensil 5, liquid tank 14 form a liquid circulation together, the residual waste liquid and corrosion residues in corrosion utensil 5 can be pumped out of the container, which has the functions of adjusting liquid level, removing waste water and residues and solution circulation, so as to maintain the stability and cleanliness of the test environment, without disassembling the utensil, the operation becomes more convenient and safe.

[0022] In the corrosion environment of the metal sample 0, the two ends of the metal sample 0 are fixed on the lower fixing part 7 and the upper fixing part 4 through the lower short pin 8 and the upper short pin 6, then the corrosion solution is poured into the corrosion container 5 and the sealing cover is closed, the upper short pin 6 is made of chromium-plated carbon steel material, has certain corrosion resistance and good conductivity, so when the corrosion solution is poured, the liquid level is at the bottom of the upper fixing part 4, the reference electrode of the electrochemical platform is fixed at the upper short pin 6, and the other electrodes are placed in the solution through the electrode holes in the sealing cover, in order to ensure the sealing, the motor hole is provided with a sealing device, and the other electrodes cannot contact the metal sample 0 to form a current closed loop, at this time, the metal sample 0 is completely immersed in the corrosion solution, then the test machine is connected with the platform 12 to provide tension and compression force for the upper supporting cylinder 1, and finally the metal sample 0 is in the corrosion environment for fatigue test.

[0023] The lower short pin 8 is made of glass fiber reinforced epoxy resin composite material, has certain tensile strength, corrosion resistance and non-conductivity, and can be immersed in the solution. The lower fixing part 7 and the upper fixing part 4 are made of glass fiber reinforced epoxy resin composite material, have corrosion resistance and impact resistance, can be not affected in the corrosion environment for a long time, can firmly fix the metal sample 0 by cooperating with the lower short pin 8 and the upper short pin 6, and can well adapt to various corrosion environments and have no conductivity, so that the electrochemical corrosion test can be well performed.

[0024] In the chemical corrosion environment, when the metal sample 0 is fatigue broken, the electrochemical platform should be closed first, the circulating water pump 11 is started, and the overflow valve 13 is adjusted to collect and remove the waste corrosion solution and waste impurities through the sleeve 10, so that the water circulation in the experiment process is ensured, then the reference electrode clamped at the upper short pin 6 and the other electrodes placed in the corrosion container 5 are taken out, and the test machine connected with the platform 12 is operated to lift and take out the metal sample 0 which has been broken.

[0025] Since the circulating water pump 11 and the overflow valve 13 are cooperatively controlled to adjust the internal pressure of the corrosion container 5, the corrosion fatigue performance test of the metal structure material under normal conditions can be performed, and the corrosion fatigue performance test of the material for pressure vessels and pressure pipelines can be simulated, and the fatigue performance test of the basic material of the pressure vessel and the ship pipeline is mainly applied.

[0026] The utility model has certain requirements to the size of the assembly sample. Must strictly abide by GB / T 20120.0-2006 standard, the sample is processed into the round bar of dumbbell shape, its size range is between 5-18 millimeter between diameter. After completing processing, the sample surface is polished. In addition before carrying out test, first need to remove the oil dirt on the sample, then use acetone to clean in ultrasonic cleaning machine 10-15 minutes, finally use electric hair dryer to blow dry the sample surface.

[0027] It is obvious to those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0028] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any slight modification, equivalent replacement and improvement made according to the technical essence of the utility model to the above embodiment should be included in the protection scope of the technical scheme of the utility model.

Claims

1. A metal material fatigue testing device for a corrosive environment, comprising an upper support cylinder (1) and a lower support base (3), the top surface of the upper support cylinder (1) being connected to a testing machine tandem platform (12), characterized in that, The corrosion device also comprises an upper fixing member (4), a lower fixing member (7), a circulating water pump (11), an overflow valve (13), a liquid tank (14) and a corrosion vessel (5). The bottom end of the lower fixing member (7) is connected to the top surface of the lower supporting base (3), and the upper part of the lower fixing member (7) penetrates the lower end surface of the corrosion vessel (5). The top end of the upper fixing member (4) is connected to the bottom surface of the upper supporting cylinder (1), and the lower part of the upper fixing member (4) penetrates the sealing cover of the corrosion vessel (5). The upper part of the lower fixing member (7) and the lower part of the upper fixing member (4) are respectively provided with a lower short pin (8) and an upper short pin (6) for connecting the two ends of a sample. The overflow valve (13), the circulating water pump (11) and the liquid tank (14) are sequentially connected through a sleeve (10), the overflow valve (13) is connected to the bottom surface of the corrosion vessel (5), and the liquid tank (14) is connected to the upper part of the side surface of the corrosion vessel (5).

2. A device for fatigue testing of metallic materials in corrosive environments according to claim 1, characterized in that: The lower fixing member (7) and the lower end surface of the corrosion vessel (5), and the upper fixing member (4) and the sealing cover of the corrosion vessel (5) are all sealed and connected through a sealing ring (15).

3. A device for fatigue testing of metallic materials in corrosive environments according to claim 1, characterized in that: The part of the lower fixing member (7) below the corrosion vessel (5) is externally provided with a sleeve (9), and the upper and lower sections of the sleeve (9) are respectively connected to the bottom surface of the corrosion vessel (5) and the top surface of the lower supporting base (3).

4. The apparatus for fatigue testing of metal materials in corrosive environments according to claim 1, characterized in that: The upper short pin (6) is made of chromium-plated carbon steel.

5. The apparatus for fatigue testing of metal materials in corrosive environments according to claim 1, characterized in that: The lower short pin (8) is made of glass fiber reinforced epoxy resin composite material.

6. A device for fatigue testing of metallic materials in corrosive environments according to claim 1, characterized in that: The surface of the upper supporting cylinder (1) is sprayed with an anti-corrosion coating.

7. A device for fatigue testing of metallic materials in corrosive environments according to claim 1, characterized in that: The upper fixing member (4) and the lower fixing member (7) are made of glass fiber reinforced epoxy resin composite material and are subjected to frosted surface treatment.

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