Temperature-controllable metal sample hydrogen embrittlement sensitivity testing device

Abstract

The utility model discloses a temperature-controllable metal sample hydrogen embrittlement sensitivity testing device which is provided with a constant-temperature water bath kettle, and an equal-height cushion block is matched in the constant-temperature water bath kettle to ensure that an electrolytic bath is horizontally placed. An anode platinum sheet and a hydrogen content test sample are in lap joint in an electrolytic bath, a tensile sample is assembled, different electrolytes are selectively injected according to different metal materials, an electrochemical workstation and a universal tensile testing machine are externally connected, and the hydrogen content test sample and the tensile sample are compared through the numerical value of the hydrogen content test sample and the numerical value of the tensile sample. The parameter indexes of a stress-strain curve, the yield strength, the tensile strength, the elongation and the reduction of area can be obtained, the loss amount of the elongation and the loss amount of the reduction of area in the hydrogen environment are compared, and finally the compatibility parameters of the metal material or the welded joint and hydrogen can be obtained under the determined hydrogen content. According to the utility model, the hydrogen charging amount can be determined without secondary processing, slow strain rate stretching is carried out, and the compatibility between a metal material or a welding joint and hydrogen can be conveniently and quickly analyzed and evaluated by matching with the temperature change.

Description

Technical Field

[0001] The utility model relates to the technical field of metal material performance detection, in particular to a temperature-controllable metal sample hydrogen embrittlement sensitivity testing device. Background Art

[0002] Since hydrogen-exposed materials have poor compatibility with hydrogen, they may leak, crack, or other unsafe behaviors under the combined effects of the external environment. Therefore, experimental research on the hydrogen embrittlement sensitivity of hydrogen-exposed materials or welded joints is extremely important. Utility Model Content

[0003] The utility model aims to provide a temperature-controllable metal sample hydrogen embrittlement sensitivity testing device, which can safely and conveniently test the compatibility of metal materials or welded joints with hydrogen within different temperature ranges and with clear internal hydrogen content.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A temperature-controllable metal sample hydrogen embrittlement sensitivity testing device comprises an open electrolytic cell placed in a constant temperature water bath, an upper sealing cover is arranged at the top of the electrolytic cell, and three electrode mounting holes are opened on the upper sealing cover, wherein an anode platinum sheet is arranged in the anode hole, a hydrogen content test sample is arranged in the first cathode hole, and a tensile sample is arranged in the second cathode hole; an internal threaded hole coaxial with the second cathode hole is opened at the bottom of the electrolytic cell, and the tensile sample extends to the bottom of the electrolytic cell after passing through the internal threaded hole; an equal height pad matched with the portion of the tensile sample extending from the bottom of the electrolytic cell is placed on the other side of the bottom of the constant temperature water bath, and the bottom of the electrolytic cell is in a horizontal state.

[0006] Preferably, the electrolytic cell is made of plexiglass.

[0007] Preferably, a thread matching the internal threaded hole is provided on the middle and lower outer wall of the tensile specimen, and the tensile specimen is threadedly connected to the internal threaded hole.

[0008] Preferably, sealing washers are installed on both sides of the connection between the tensile specimen and the internal threaded hole, and fixing nuts are installed on both sides of the sealing washers.

[0009] Preferably, the fixing nut is subjected to anti-corrosion surface treatment; and the sealing gasket is made of rubber.

[0010] Preferably, steps are provided in the middle of the anode platinum sheet and the hydrogen content test sample, and the steps overlap at the electrode mounting hole.

[0011] Preferably, the hydrogen content test specimen and the tensile specimen are made of the same material.

[0012] The utility model is used for a method for testing hydrogen embrittlement sensitivity of a metal sample, comprising the following steps:

[0013] Step 1: Assemble the lower part of the tensile specimen into the internal threaded hole at the bottom of the electrolytic cell, and fix the two sides of the internal threaded hole with sealing washers and fixing nuts; put the electrolytic cell stably into the constant temperature water bath, and place equal height pads at the bottom of the constant temperature water bath to keep the electrolytic cell in a horizontal state;

[0014] Step 2: add an appropriate amount of water into a constant temperature water bath, add an electrolyte selected according to the material of different metal samples into the electrolytic cell, cover the upper sealing cover, extend the upper end of the tensile sample through the second cathode hole to the outside of the electrolytic cell, connect the top of the tensile sample to the cathode wire of the electrochemical workstation, overlap the anode platinum sheet connected to the anode wire of the electrochemical workstation in the anode hole, overlap the hydrogen content test sample connected to the cathode wire of the electrochemical workstation in the first cathode hole; heat the water in the constant temperature water bath to the set temperature, adjust the charging current intensity of the electrochemical workstation to perform a hydrogen charging test;

[0015] Step 3. After the preset hydrogen charging time is reached, the electrolytic cell is taken out from the constant temperature water bath, and the two ends of the tensile specimen are clamped in the universal tensile testing machine. When the tensile specimen undergoes irreversible plastic deformation, the hydrogen charging is stopped, the anode platinum sheet and the hydrogen content test specimen are disconnected from the electrochemical workstation, and the anode platinum sheet is taken out from the electrolytic cell for cleaning, and the anode platinum sheet is preserved. The hydrogen content test specimen is placed in an oxygen, nitrogen and hydrogen analyzer for hydrogen content determination, and then the tensile test is continued until the tensile specimen breaks; the stress-strain curve, yield strength, tensile strength, elongation and cross-sectional shrinkage parameters of the hydrogen content test specimen and the tensile specimen are detected, and the loss of elongation and cross-sectional shrinkage of the specimen in the hydrogen environment is compared to obtain the compatibility parameters of the specimen and hydrogen at a certain hydrogen content.

[0016] The hydrogen content test specimens and tensile specimens are sampled from hydrogen-storing metal materials or welded joints of metal materials.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The utility model adopts a dual cathode design in the electrochemical hydrogen charging process, which ensures that the hydrogen charging amount can be accurately measured without secondary processing. The device is externally connected to a tensile testing machine, and the hydrogen charging is not interrupted during the tensile test. A slow strain rate tensile test is performed when the internal hydrogen content is determined, which effectively simulates the actual working conditions of the hydrogen storage container, and the operation is simpler, more convenient and safer.

[0019] The constant temperature water bath used in the utility model can realize electrochemical hydrogen charging within a temperature range of 0-98°C, realizes the sensitivity test of hydrogen compatibility of metal materials to temperature, and the device can analyze and evaluate the influence of temperature on the hydrogen compatibility of metal materials or welded joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a temperature-controllable metal sample hydrogen embrittlement sensitivity testing device;

[0021] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the test device;

[0022] In the figure: 1. Constant temperature water bath, 2. Electrolytic cell, 3. Equal height pads, 4. Upper sealing cover, 5. Anode platinum sheet, 6. Hydrogen content test specimen, 7. Tensile specimen, 8. Internal threaded hole, 9. Anode hole, 10. First cathode hole, 11. Second cathode hole. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 , Figure 2 A temperature-controllable metal sample hydrogen embrittlement sensitivity testing device is shown, comprising an open electrolytic cell 2 placed in a constant temperature water bath 1, an upper sealing cover 4 is provided at the top of the electrolytic cell 2, and the upper sealing cover 4 has three electrode mounting holes, wherein an anode platinum sheet 5 is provided in the anode hole 9, a hydrogen content test sample 6 is provided in the first cathode hole 10, and a tensile sample 7 is provided in the second cathode hole 11; an internal threaded hole 8 coaxial with the second cathode hole 11 is provided at the bottom of the electrolytic cell 2, and the tensile sample 7 extends to the bottom of the electrolytic cell 2 after passing through the internal threaded hole 8, and an equal height pad 3 adapted to the portion of the tensile sample 7 extending from the bottom of the electrolytic cell 2 is placed on the other side of the bottom of the constant temperature water bath 1, and the bottom of the electrolytic cell 2 is in a horizontal state.

[0025] The utility model is used for a method for testing hydrogen embrittlement sensitivity of a metal sample, comprising the following steps:

[0026] Step 1: Screw the lower end of the tensile specimen 7 for the slow strain rate tensile test into the internal threaded hole 8 at the bottom of the electrolytic cell 2, and seal and fix it from inside and outside the electrolytic cell 2 using a rubber sealing ring and a corrosion-resistant nut.

[0027] Step 2: Place the electrolytic cell 2 steadily into the constant temperature water bath 1 with the aid of the equal height pads 3, add an appropriate amount of water into the constant temperature water bath 1, add the electrolyte selected according to the material of different metal samples into the electrolytic cell 2, cover with the upper sealing cover 4, overlap the anode platinum sheet 5 in the anode hole 9, overlap the hydrogen content test sample 6 in the first cathode hole 10, and pass the upper end of the tensile sample 7 through the second cathode hole 11.

[0028] Step 3: Connect the anode platinum sheet 5 to the anode wire of the electrochemical workstation, connect the hydrogen content test sample 6 and the tensile sample 7 to the cathode wire of the electrochemical workstation respectively, adjust the constant temperature water bath 1 to heat to the required temperature, and adjust the charging current intensity of the electrochemical workstation to perform a hydrogen charging test.

[0029] Step 4: After the preset hydrogen charging time is reached, the electrolytic cell 2 is taken out from the constant temperature water bath 1, and the tensile specimen 7 is clamped in the universal tensile testing machine. When the tensile specimen undergoes irreversible plastic deformation, the hydrogen charging is stopped, the anode platinum sheet 5 and the hydrogen content test specimen 6 are disconnected from the electrochemical workstation, and the anode platinum sheet 5 is taken out from the electrolytic cell for cleaning, the anode platinum sheet 5 is preserved, and the hydrogen content test specimen 6 is placed in the oxygen, nitrogen and hydrogen analyzer for hydrogen content determination. Then the tensile test is continued until the tensile specimen 7 breaks.

[0030] Step 5: Process and compare the test data to obtain the stress-strain curve, yield strength, tensile strength, elongation and cross-sectional shrinkage parameter indicators, compare the loss of elongation and cross-sectional shrinkage in the hydrogen environment, and finally obtain the compatibility parameters of metal materials or welded joints with hydrogen at a certain hydrogen content.

[0031] The utility model adopts a dual cathode design in the electrochemical hydrogen charging process, which ensures that the hydrogen charging amount can be accurately measured without secondary processing. The device is externally connected to a tensile testing machine, and the hydrogen charging is not interrupted during the tensile test. A slow strain rate tensile test is performed when the internal hydrogen content is determined, which effectively simulates the actual working conditions of the hydrogen storage container, and the operation is simpler, more convenient and safer.

[0032] The above are only preferred examples of the present invention. It should be noted that for ordinary technicians in this field, under the technical enlightenment provided by the present invention, other equivalent deformations and improvements can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A temperature-controllable metal sample hydrogen embrittlement sensitivity testing device, characterized in that: The invention comprises an open electrolytic cell (2) placed in a constant temperature water bath (1), wherein an upper sealing cover (4) is arranged at the top of the electrolytic cell (2), and the upper sealing cover (4) is provided with three electrode mounting holes, wherein an anode platinum sheet (5) is arranged in the anode hole (9), a hydrogen content test sample (6) is arranged in the first cathode hole (10), and a tensile test sample (7) is arranged in the second cathode hole (11); an internal threaded hole (8) coaxial with the second cathode hole (11) is arranged at the bottom of the electrolytic cell (2), and the tensile test sample (7) extends to the bottom of the electrolytic cell (2) after passing through the internal threaded hole (8); and a spacer (3) of equal height matching the portion of the tensile test sample (7) extending from the bottom of the electrolytic cell (2) is placed on the other side of the bottom of the constant temperature water bath (1), and the bottom of the electrolytic cell (2) is in a horizontal state.

2. The testing device according to claim 1, characterized in that: The electrolytic cell (2) is made of organic glass.

3. The testing device according to claim 1 or 2, characterized in that: A thread matching the internal thread hole (8) is provided on the middle and lower outer wall of the tensile specimen (7), and the tensile specimen (7) is threadedly connected to the internal thread hole (8).

4. The testing device according to claim 3, characterized in that: Sealing washers are installed on both sides of the connection between the tensile test specimen (7) and the internal threaded hole (8), and fixing nuts are installed on both sides of the sealing washers.

5. The testing device according to claim 4, characterized in that: The fixing nut is subjected to anti-corrosion surface treatment; the sealing gasket is made of rubber.

6. The testing device according to claim 5, characterized in that: The anode platinum sheet (5) and the hydrogen content test sample (6) are both provided with steps in the middle, and the steps overlap the electrode installation holes.

7. The testing device according to claim 6, characterized in that: The hydrogen content test specimen (6) and the tensile specimen (7) are made of the same material.

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