CN204255823U - Stress-galvanic corrosion proving installation - Google Patents

Abstract

The utility model relates to a stress-electrochemical corrosion testing device capable of realizing the presence of anaerobic bacteria. The device consists of an electrochemical workstation, a stress corrosion stretching machine, a constant temperature water bath and a self-made stretching box. The self-made stretching box is a cylindrical double-chamber structure. Dead, the inner wall has a bracket, the height of the inner room is lower than that of the outer room, the box cover is drilled with many holes, the gap between the box cover and the box body is sealed with a sealing film, and the outer layer of the stretch box is covered with a layer of cotton cloth tubular heat preservation cover. There are rubber bands at both ends, and two medium solutions can be used in the constant temperature water bath for heating or cooling the test solution. The device can avoid the overflow of the solution in the stretching box, and provide a constant temperature and airtight stress corrosion environment for the tensile sample, and realize the simultaneous measurement of multiple testing methods.

Description

Stress-electrochemical corrosion test device

technical field

The utility model relates to a corrosion test device, in particular to a stress-electrochemical corrosion test device which can simultaneously perform stress corrosion and electrochemical corrosion tests in the presence of anaerobic bacteria.

Background technique

At present, the known stress corrosion testing device consists of a tensile box and a tensile machine. Seal the test piece on the stretching box, put the test solution in the box and cover the box, and fix the whole stretching box on the stress corrosion tensile machine for testing. However, the box body and the box cover of this stretching box are easy to separate, and the solution often overflows on the stress corrosion stretching machine, causing the drive shaft of the stretching machine to rust. Moreover, the current stress corrosion test device can only be carried out at room temperature, and anaerobic bacteria are suitable for growing in a constant temperature anaerobic environment at 30°C. Stress corrosion testing in the presence of anaerobic bacteria at room temperature will reduce the activity of anaerobic bacteria. The corrosion effect is weakened, and the test results are quite different from the real situation, which is easy to cause misjudgment.

Utility model content

In order to overcome the disadvantages that the existing stress corrosion test is only limited to room temperature and the solution is easy to overflow, the utility model provides a stress-electrochemical corrosion test device, which can not only carry out conventional stress corrosion tests, but also provide a constant temperature environment. A setup for simultaneous testing of stress-electrochemical corrosion in the presence of anaerobic bacteria.

The technical scheme that the utility model solves its technical problem adopts is:

It includes an electrochemical workstation, a stress corrosion stretching machine, a constant temperature water bath and a stretching box. The stretching box is fixed on the stress corrosion stretching machine, and the water inlet and outlet of the stretching box are connected with the constant temperature water bath; the stretching box is a double chamber structure, the outer chamber is filled with medium solution, and the inner chamber is filled with test solution; the top of the outer chamber is sealed, and the inner wall has a bracket, which supports the lid, and the gap between the lid and the box body is sealed with a sealing film; the stress-loaded test piece is fixed in the tension On the sealing plug at the bottom of the extension box, the salt bridge and platinum sheet are installed on the box cover on both sides of the stress-loaded test piece, the salt bridge is connected to the reference electrode, and the platinum piece, stress-loaded test piece and reference electrode are respectively connected to the electrochemical workstation electrode interface.

The height of the inner chamber is lower than that of the outer chamber.

The box cover is drilled with a plurality of holes.

The salt bridge and the platinum sheet are facing the central part of the stress-loaded test piece.

The stretching box is covered with a heat preservation cover.

A thermometer and a nitrogen tube were inserted into the inner chamber test solution.

The constant temperature water bath and the stretching box are communicated through rubber tubes, and the rubber tubes are horizontally bound on the stretching machine pillars.

The platinum sheet is connected to the auxiliary electrode interface, the stress loading test piece is connected to the working electrode interface, and the reference electrode is connected to the reference electrode interface.

The stress corrosion tensile machine continuously applies a constant external load to the stress-loaded test piece through the transmission device of the tensile machine.

Two medium solutions of water and 95% ethanol are used in the constant temperature water bath.

The advantages and effects of the utility model are as follows:

1. The stretching box is a cylindrical double-chamber structure. The outer room is filled with medium solution, and the inner room is filled with test solution. After being heated by a constant temperature water bath, the medium solution circulates along the outer room of the stretching box, continuously transferring heat to the inner room, and the inner room solution A thermometer is inserted in the middle, which can realize the constant and accurate control of the stress corrosion test solution between 0°C and 100°C, and conduct research on the influence of temperature changes on the stress corrosion of materials.

2. The height of the inner chamber is lower than that of the outer chamber. When the stretching box is tilted, it can effectively prevent the liquid from overflowing and mixing in the inner and outer chambers, and prevent the stretching machine from being corroded.

3. The box cover is drilled with multiple holes for connecting three electrodes, which can simultaneously measure electrochemical corrosion and stress corrosion behavior.

4. The gap between the stretch box cover and the box body is sealed with a sealing film to realize a closed environment and meet the requirements of anaerobic bacteria at a constant temperature of 30°C and airtight conditions.

To meet the growth requirements in a closed environment, realize the stress corrosion test under the condition of adding bacteria.

5. There is a layer of cylindrical cotton heat preservation cover on the outer casing of the stretching box. There are rubber bands on both ends of the cotton heat preservation cover, which is easy to disassemble and can effectively reduce heat loss.

6. Two medium solutions of water and 95% ethanol can be used in the constant temperature water bath, which can be used for heating and cooling test solutions.

7. The device can be disassembled, the operation is simple, and the floor space is small.

Description of drawings

Fig. 1 is the front sectional view of the utility model device.

Fig. 2 is a top view of the self-made stretching box in the utility model device.

Fig. 3 is a left view of the self-made stretching box in the utility model device.

The device in the figure is composed of: 1. Electrochemical workstation; 2. Auxiliary electrode interface; 3. Working electrode interface; 4. Reference electrode interface; 5. Outer chamber; 6. Inner chamber; 7. Platinum sheet; 8. Box cover ;9. Stress loading test piece; 10. Stretch rod; 11. Sealing plug; 12. Reference electrode; 13. Salt bridge; 14. Cotton insulation cover; , constant temperature water bath, 18, stretching machine transmission, 19, stress corrosion stretching machine, 20, auxiliary electrode socket, 21, thermometer socket, 22, stress loading test piece placement port, 23, nitrogen input pipe socket, 24, Reference electrode socket, 25, carbon dioxide input tube socket, 26, support.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model patent is described in further detail.

Example

As shown in Figure 1-3, it includes an electrochemical workstation 1, a stress corrosion stretching machine 19, a constant temperature water bath 17 and a stretching box, the stretching box is fixed on the stress corrosion stretching machine 19, and the water inlet and outlet 15 of the stretching box are connected to the The constant temperature water bath 17 is connected through the rubber tube 16, and the rubber tube is horizontally tied on the pillar of the stretching machine. The constant temperature water bath 17 uses two medium solutions of water and 95% ethanol; the stretching box is a double-chamber structure, and the outer chamber 5. Take the medium solution, put the test solution in the inner chamber 6, and insert a thermometer and a nitrogen pipe into the test solution in the inner chamber; , the box cover is drilled with multiple holes, the holes include auxiliary electrode socket 20, thermometer socket 21, stress loading test piece placement port 22, nitrogen input tube socket 23, reference electrode socket 24, carbon dioxide input tube socket 25, box cover 8 and The gap between the box bodies is sealed with a sealing film; the stretching box is covered with a heat preservation cover, and the two ends of the heat preservation cover are provided with rubber bands; the stress loading test piece 9 is fixed on the sealing plug 11 at the bottom of the stretching box, and the salt bridge 13 and the platinum sheet 7 are installed Located on both sides of the stress-loaded test piece on the box cover 8, the salt bridge 13 and the platinum sheet 7 are facing the central part of the stress-loaded test piece 9, the salt bridge 13 is connected to the reference electrode 12, the platinum sheet 7 is connected to the auxiliary electrode interface 2, and the stress The loading test piece 9 is connected to the working electrode interface 3 , and the reference electrode is connected to the reference electrode interface 4 . The stress corrosion tensile machine continuously applies a constant external load to the stress-loaded test piece through the tensile machine transmission device 18 .

The test process of the present utility model is as follows:

When using this device to carry out stress corrosion test under the condition containing anaerobic bacteria, the stress loading test piece 9 is first fixed on the sealing plug 11 at the bottom end of the tensile box with silica gel, and after the silica gel is air-dried, it is connected with the salt bridge 13, Platinum sheet 7 and box cover 8 were put into a fume hood for ultraviolet sterilization for 15 minutes, and then ventilated for 15 minutes, then the API medium and Korla soil simulation solution were mixed and inoculated at a ratio of 1:2 in a sterile operating table, and poured into Stretch the inner chamber 6 of the box, install the salt bridge 13 and the platinum sheet 7 on the box cover 8, and cover the stretching box together with the box cover 8, the salt bridge 13 and the platinum sheet 7 are located on both sides of the stress-loaded test piece , and the central part of the test piece is loaded against the stress, and the edge and hole of the box cover are sealed with a sealing film. Put the cotton cloth insulation cover 14 on the stretching box, fix the whole stretching box on the stretching rod 10, insert the thermometer and the nitrogen tube into the solution in the inner chamber, and open the valve of the nitrogen bottle to ensure that the whole test process is anaerobic. environment. Connect the water inlet and outlet of the constant temperature water bath 17 with the water inlet and outlet 15 of the stretching box with the rubber tube 16, and lock it with screws. The rubber tube 16 at the water inlet and outlet of the stretching box is tied horizontally to the pillar of the stretching machine, so as to prevent the gravity of the rubber tube 16 from bringing torque to the stress-loaded test piece 9 and affecting the accuracy of the measurement data. Start the power supply of the constant temperature water bath 17, after setting the temperature on the temperature indicator dial, turn on the cycle button, then the medium solution will heat up, and flow into the entrance of the stretching box along the rubber tube 16, and flow from the outlet after a circle around the outer chamber 5 of the stretching box. Water port flows out, returns to constant temperature water bath 17 li. The two medium solutions of water and 95% ethanol continuously transfer heat to the solution in the inner chamber when flowing through the outer chamber 5 of the stretching box, and the temperature of the solution increases gradually. After a period of time, the reading of the thermometer stabilizes on the specified scale. The medium solution used for heating is water, and the medium solution used for cooling is 95% ethanol. 95% ethanol is volatile and needs to be replenished frequently.

Then connect the three electrodes, connect the platinum sheet 7 to the auxiliary electrode interface 2, connect the stress loading test piece 9 to the working electrode interface 3, connect the reference electrode 12 to the reference electrode interface 4, then start the electrochemical workstation 1 and stress Corrosion tensile machine 19, turn on the computer, click the electrochemical test icon and the slow strain rate stress corrosion test icon, set the test parameters, select the save path, click the start button, and the test starts. The aggressive anions in the solution continuously cause electrochemical corrosion to the stress-loaded test piece 9. At the same time, the stress-corrosion stretching machine 19 continuously applies a constant external load to the stress-loaded test piece 9 through the stretching machine transmission device 18, and the stress-loaded test piece 9 Simultaneously undergoing electrochemical corrosion and stress corrosion, the electrochemical workstation 1 and the stress corrosion tensile machine 19 automatically record the electrochemical corrosion and stress corrosion data of the stress-loaded test piece 9 respectively. The stress corrosion test generally takes two days. During the test, the medium solution in the constant temperature water bath 17 continuously flows through the outer chamber 5 of the stretching box, and the heat is continuously transferred to the inner chamber solution, so that the temperature of the inner chamber solution is kept constant at Specifies the scale. After the test, save the test image, turn off the electrochemical workstation 1, the stress corrosion stretching machine 19 and the constant temperature water bath 17 power switches, open the 15 screws at the water inlet and outlet of the stretching box, disassemble the stretching box, and connect the constant temperature water bath 17 and Put the rubber tube 13 to a free place, clean the inner chamber 6 of the stretching box, and measure the size of the stress-loaded test piece 9.

The above specific descriptions about the utility model are only used to illustrate the utility model and are not limited to the technical solutions described in the embodiments of the utility model. Those of ordinary skill in the art should understand that the utility model can still be modified or equivalently replaced to achieve the same technical effect. As long as it meets the needs of use, it is within the protection scope of the present utility model.

Claims (10)

1. stress-galvanic corrosion proving installation, it is characterized in that comprising electrochemical workstation, stress corrosion drawing machine, constant temperature water bath and stretching box, stretching box is fixed on stress corrosion drawing machine, and stretching box intake-outlet is communicated with constant temperature water bath; Described stretching box is two rooms structures, and mistress walks medium solution, and testing liquid is put in interior room; Mistress shuts on top, and chamber wall has support, and support supports lid, and between lid and box body, space sealed membrane seals; Stress loading test specimen is fixed on stretching box bottom end seal beyond the Great Wall, and salt bridge, platinized platinum are arranged on lid and are positioned at stress loading test specimen both sides, and salt bridge connects contrast electrode, and platinized platinum, stress loading test specimen and contrast electrode are connected respectively to the electrode interface of electrochemical workstation.

2. stress according to claim 1-galvanic corrosion proving installation, is characterized in that described interior room height is lower than mistress.

3. stress according to claim 1-galvanic corrosion proving installation, is characterized in that described lid is drilled with multiple hole.

4. stress according to claim 1-galvanic corrosion proving installation, is characterized in that described salt bridge and platinized platinum positive counter stress loading specimen central part.

5. stress according to claim 1-galvanic corrosion proving installation, is characterized in that described stretching box overcoat has stay-warm case.

6. stress according to claim 1-galvanic corrosion proving installation, is characterized in that being inserted with thermometer and nitrogen tube in described interior room testing liquid.

7. stress according to claim 1-galvanic corrosion proving installation, it is characterized in that being communicated with by rubber tube between described constant temperature water bath and stretching box, rubber tube level is tied up on drawing machine pillar.

8. stress according to claim 1-galvanic corrosion proving installation, it is characterized in that described platinized platinum is connected to auxiliary electrode interface, stress loading test specimen is connected to working electrode interface, and contrast electrode is connected to contrast electrode interface.

9. stress according to claim 1-galvanic corrosion proving installation, is characterized in that constant plus load is constantly applied to stress loading test specimen by drawing machine gearing by described stress corrosion drawing machine.

10. stress according to claim 1-galvanic corrosion proving installation, is characterized in that adopting water and 95% ethanol two media solution in described constant temperature water bath.