CN218629440U - Detection device for detecting galvanic corrosion between different metals - Google Patents
Detection device for detecting galvanic corrosion between different metals Download PDFInfo
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- CN218629440U CN218629440U CN202223077638.4U CN202223077638U CN218629440U CN 218629440 U CN218629440 U CN 218629440U CN 202223077638 U CN202223077638 U CN 202223077638U CN 218629440 U CN218629440 U CN 218629440U
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Abstract
The utility model belongs to the field of galvanic corrosion detection, in particular to a detection device for detecting galvanic corrosion between different metals, which comprises two experiment cabins, a pipeline connecting the two experiment cabins and a valve arranged on the pipeline; the experiment chamber comprises a chamber body and a chamber cover arranged on the chamber body; the detection device for detecting the galvanic couple corrosion characteristics and the corrosion degree between different kinds of metals can detect the galvanic couple corrosion characteristics and the corrosion degree between different kinds of metals in real time by controlling corrosion media (solution concentration, solution composition, replacement liquid and the like), monitoring the solution height, collecting the corrosion media in real time, detecting a tested piece in real time, independently measuring and controlling test partitions and the like.
Description
Technical Field
The utility model belongs to galvanic corrosion detection area, concretely relates to detect detection device of galvanic corrosion between different metals.
Background
Galvanic corrosion is metal corrosion caused by galvanic corrosion generated by a corrosion galvanic cell when a less active metal and a more active metal contact each other in a specific environment, generally in an electrolyte solution or an environment similar to the electrolyte solution, and the corrosion phenomenon is galvanic corrosion which takes an anode metal (i.e. the more active metal) as a main corrosion object.
In the development process of novel metal materials, the corrosion resistance and galvanic corrosion effect between different metals need to be tested and tested.
The general test procedure is to couple two test pieces of metals to be tested (metal A and metal B), which is a connection means for connecting the two metals to be tested (for example, two metals to be tested are connected to each other at both ends of a wire), each test group consisting of three coupled sample pairs, each coupled sample pair being individually immersed in 3.5% NaCl solution for 15 days while immersing the uncoupled test piece under the same conditions as a blank group. And measuring the corrosion potential of the metal A and the metal B and the corrosion current of the coupling group at 0h, 1h, 4h, 8h and 24h after the beginning of soaking, respectively carrying out the measurement in the morning and the afternoon every day from the beginning of soaking for 2d, simultaneously changing the corrosion solution every day, keeping the ion concentration of the corrosion solution stable, taking out the sample until the measurement in the afternoon for 15d, and carrying out corrosion rate measurement.
The process of measuring corrosion potential is: 1. taking out the tested piece from the corrosion solution; 2. placing the test piece in a 3-part nacl solution while placing a reference electrode in the solution; 3. the positive pole of the voltmeter is connected with the sample, the negative pole is connected with the reference electrode, and the voltage value and the corrosion potential of the tested piece are detected.
The process of measuring the corrosion current is as follows: 1. disconnecting the lead between the metal A and the metal B; 2. measuring the current value between the metal A and the metal B by using a digital multimeter, wherein the anode is connected with the metal A, the cathode is connected with the metal B;
the process of measuring the corrosion rate is 1. Taking out the test piece from the solution; 2. the test piece was immersed in a 3-part% nacl solution, and the corrosion rate of the test piece was measured by the three-electrode method. In whole experimentation, 6 experimental pairs totally of experimental group and contrast group, 12 are tested the appearance promptly, experimental prophase test interval is inseparable, test work is loaded down with trivial details, repeatability is high, personnel's operation has inconvenience, follow-up need carry out two every day and detect and change once corrosive solution and carry out 15 days in succession, test time and cycle are longer, need take out every sample and put into electrolyte and measure when measuring corrosion potential and corrosion rate at every turn, need carry out 12 survey measurements promptly, prepare 12 electrolyte environment, test operation is tedious, personnel's actual operation has a great deal of inconvenience.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the shortcoming among the prior art, provide a detection device that detects galvanic corrosion between different metals.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a detection device for detecting galvanic corrosion between different metals comprises two experiment chambers, a pipeline connecting the two experiment chambers and a valve arranged on the pipeline; the experimental cabin comprises a cabin body and a cabin cover arranged on the cabin body; a tested sample, a reference electrode and an auxiliary electrode are arranged in the cabin; the hatch cover is provided with a liquid injection hole, an auxiliary electrode jack, a tested sample wiring port and a reference electrode jack; the tested sample is connected with the tested sample wiring port through a connecting rod; the auxiliary electrode is connected with the auxiliary electrode jack; the reference electrode is connected with the reference electrode jack.
And the outer side of the experiment chamber is connected with a liquid level display meter.
The liquid level display meter comprises a liquid level accommodating bin, connecting flanges which are arranged at two ends of the liquid level accommodating bin and connected with the experiment chamber, and a liquid level drain valve arranged at the bottom of the liquid level accommodating bin; and a display window is arranged on the surface of the liquid level accommodating bin.
And a cabin body liquid discharge valve is arranged at the bottom of the experiment cabin.
Compared with the prior art, the beneficial effects of the utility model are that:
the detection device for detecting the galvanic couple corrosion characteristics and the corrosion degree between different kinds of metals can detect the galvanic couple corrosion characteristics and the corrosion degree between different kinds of metals in real time by controlling corrosion media (solution concentration, solution composition, replacement liquid and the like), monitoring the solution height, collecting the corrosion media in real time, detecting a tested piece in real time, independently measuring and controlling test partitions and the like.
The testing device can accurately control the type and content of corrosive substances of corrosive media, the testing environment is closed, the stability of the testing environment is guaranteed, meanwhile, the reference electrode and the auxiliary electrode are arranged, an internal test piece can be detected under the condition that the testing cabin cover is not opened, namely, the corrosion reaction process of a tested piece is not influenced in the data acquisition process, real-time nondestructive detection can be achieved, and therefore the galvanic corrosion characteristics and the corrosion degree of different types of metals can be accurately detected. The device is simple and easy to operate, and the degree of freedom of adjustment is high.
Drawings
FIG. 1 is a schematic view of the overall structure of the detecting device for detecting galvanic corrosion between different metals according to the present invention;
fig. 2 is a top view of the detection device for detecting galvanic corrosion between different metals of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.
1-2 show a detection device for detecting galvanic corrosion between different metals, which comprises two experiment chambers, a pipeline connecting the two experiment chambers and a valve 1 arranged on the pipeline; the valve is a double-union ball valve and is connected with the experiment cabin through a pipeline, and the connection mode can be a socket type or threaded connection, so that the air tightness and the water resistance of connection are ensured.
The experimental cabin comprises a cabin body 10 and a cabin cover 9 arranged on the cabin body; a tested sample 8, a reference electrode 2 and an auxiliary electrode 4 are arranged in the cabin; the hatch cover is provided with a liquid injection hole 5, an auxiliary electrode jack, a tested sample wiring port 3 and a reference electrode jack; the tested sample is connected with the tested sample wiring port 3 through a connecting rod; the auxiliary electrode is connected with the auxiliary electrode jack; the reference electrode is connected with the reference electrode jack. The bottom of the experimental cabin body is provided with a cabin body liquid discharge valve 7.
The reference electrode 2 is an Ag/AgCl reference electrode, the reference electrode is inserted into the cabin body 10 from the cabin cover 9 of the experiment cabin, the reference electrode 2 is exposed out of the cabin cover by 100mm, the upper end of the reference electrode is connected with a lead, and the reference electrode is connected with a reference electrode interface of an electrochemical workstation during testing. The tested sample wiring port 3 is an iron rod-shaped wiring terminal, the lower end of the tested sample wiring port is connected with the tested sample 8 through a lead, the upper end of the port is exposed out of the upper cover of the experiment cabin by 100mm, and the upper end of the port is connected with the lead and is connected with a working electrode interface of detection equipment during testing.
The auxiliary electrode 4 is a platinum electrode, the auxiliary electrode is inserted into the cabin 10 from the cabin cover 9 of the experiment cabin, the auxiliary electrode 2 is exposed out of the cabin cover by 100mm, the upper end of the auxiliary electrode is connected with a lead, and the auxiliary electrode is connected with an auxiliary electrode interface of the detection equipment during testing. The liquid injection hole 5 is a round hole with the diameter of 100mm and is positioned at the position of the solid hatch 9, which is 200mm away from the edge.
And the outer side of the experiment chamber is connected with a liquid level display meter 6. The liquid level display meter comprises a liquid level accommodating bin 601, connecting flanges 603 which are arranged at two ends of the liquid level accommodating bin and connected with the experiment chamber, and a liquid level drain valve 602 which is arranged at the bottom of the liquid level accommodating bin; and a display window is arranged on the surface of the liquid level accommodating bin.
The liquid level display meter 6 is a flange type liquid level meter and is arranged on the outer side of each of the two cabin bodies 10. The drain valve 7 of the cabin body is a PVC ball valve with the diameter DN10, and the bottom parts of the cabin bodies 10 at the two sides are respectively provided with one valve. The tested sample 8 is a tested metal sample, and the upper end of the tested sample is connected with the tested sample wiring port 3. The cover 9 and the cabin 10 are made of corrosion-resistant PVC plates.
The application process comprises the following steps: in testing galvanic corrosion characteristics between dissimilar metals: connecting two tested metal test pieces to the tested sample wiring ports 3 of two experimental cabins respectively, covering a cabin cover 9, inserting a reference electrode 2 and an auxiliary electrode 4 into the experimental cabins, closing a liquid level drain valve 602 and a cabin body drain valve 7, opening a valve (double-control ball valve) 1, injecting medium solution from a liquid injection hole 5, observing a liquid level display meter 6, stopping injecting liquid after the liquid level exceeds the upper end of the tested sample by 100mm, closing the liquid injection hole 5, and recording the test starting time.
Testing the corrosion potential, the corrosion current and the corrosion rate of the tested piece at a specified test time node;
when the corrosion current is tested: the ammeter is connected in series with the sample wiring ports 3 of the two cabin bodies 10, and the current value of a loop of 'sample A-corrosion solution-sample B-ammeter-sample A' is measured to be corrosion current.
When the corrosion potential is tested: firstly closing a valve 1 (a double-union ball valve), opening liquid discharging valves 7 of two cabin bodies 10 to discharge corrosive solution, then closing the liquid discharging valves 7, injecting 3 percent NaCl solution from two liquid injection holes 5, observing a liquid level display meter 6, stopping liquid injection after the liquid level exceeds 100mm of the upper end of a tested sample, respectively detecting the corrosion potential of a test piece in the two cabin bodies, connecting a wiring port 3 of the tested sample by using a positive electrode of a voltmeter, connecting a reference electrode 2 by using a negative electrode of the voltmeter, analyzing the galvanic corrosion characteristics of two metals by comparing the potential difference change trends of the increase of the reaction time of the two metals, finally opening the liquid discharging valves 7 of the two cabin bodies to send out the solution, then closing the liquid discharging valves 7, injecting 3.5 NaCl corrosive solution from the two liquid injection holes 5, observing the liquid level display meter 6, stopping liquid injection after the liquid level exceeds 100mm of the upper end of the tested sample, opening the valve 1 (the double-union ball valve) to continue the test.
The polarization curve of the tested piece is measured by an electrochemical workstation, the corrosion degree of the tested piece is represented, the working electrode interface of the electrochemical workstation is connected with a tested sample wiring port 3, the auxiliary electrode interface is connected with an auxiliary electrode 4, the reference electrode interface is connected with a reference electrode 2, the connectivity of a three-electrode system is tested, and the tested pieces A and B are tested independently.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A detection device for detecting galvanic corrosion between different metals is characterized by comprising two experiment chambers, a pipeline for connecting the two experiment chambers and a valve arranged on the pipeline; the experimental cabin comprises a cabin body and a cabin cover arranged on the cabin body; a tested sample, a reference electrode and an auxiliary electrode are arranged in the cabin; the hatch cover is provided with a liquid injection hole, an auxiliary electrode jack, a tested sample wiring port and a reference electrode jack; the tested sample is connected with the tested sample wiring port through a lead; the auxiliary electrode is connected with the auxiliary electrode jack; the reference electrode is connected with the reference electrode jack.
2. The apparatus according to claim 1, wherein a liquid level indicator is connected to the outside of the experimental chamber.
3. The apparatus of claim 2, wherein the liquid level indicator comprises a liquid level container, connecting flanges disposed at two ends of the liquid level container and connected to the test chamber, and a liquid level drain valve disposed at the bottom of the liquid level container; and a display window is arranged on the surface of the liquid level accommodating bin.
4. The detection apparatus for detecting galvanic corrosion between dissimilar metals according to claim 1, wherein a cabin drain valve is disposed at the bottom of the experiment cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223077638.4U CN218629440U (en) | 2022-11-21 | 2022-11-21 | Detection device for detecting galvanic corrosion between different metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223077638.4U CN218629440U (en) | 2022-11-21 | 2022-11-21 | Detection device for detecting galvanic corrosion between different metals |
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| Publication Number | Publication Date |
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| CN218629440U true CN218629440U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223077638.4U Active CN218629440U (en) | 2022-11-21 | 2022-11-21 | Detection device for detecting galvanic corrosion between different metals |
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| CN (1) | CN218629440U (en) |
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- 2022-11-21 CN CN202223077638.4U patent/CN218629440U/en active Active
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