CN115615912B - Method and device for detecting copper corrosion of oil product for oil-cooled motor - Google Patents
Method and device for detecting copper corrosion of oil product for oil-cooled motor Download PDFInfo
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- CN115615912B CN115615912B CN202211333347.9A CN202211333347A CN115615912B CN 115615912 B CN115615912 B CN 115615912B CN 202211333347 A CN202211333347 A CN 202211333347A CN 115615912 B CN115615912 B CN 115615912B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 136
- 239000010949 copper Substances 0.000 title claims abstract description 136
- 238000005260 corrosion Methods 0.000 title claims abstract description 59
- 230000007797 corrosion Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000032683 aging Effects 0.000 claims abstract description 12
- 239000003209 petroleum derivative Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 31
- 239000003921 oil Substances 0.000 description 137
- 238000009413 insulation Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 6
- 238000005498 polishing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010718 automatic transmission oil Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The application discloses an oil copper corrosion detection method and device for an oil cooling motor, and belongs to the technical field of oil cooling motor corrosion and protection. The method for detecting copper corrosion of the oil product for the oil-cooled motor comprises the following steps: firstly, connecting two polished copper bar electrodes with two poles of an input voltage respectively, and then immersing the two copper bar electrodes into an oil product; square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 200+/-50 ns, the duty ratio is 50%, and after aging for 24 hours, the two copper bar electrodes after testing are taken out; and whether the oil product for the oil cooling motor is qualified or not is judged by observing the appearance changes of the two copper bar electrodes and the oil product before and after the test and measuring the volume resistivity changes and the copper content changes of the oil product before and after the test, so that a method basis is provided for selecting the oil product for the oil cooling motor of the new energy automobile.
Description
Technical Field
The application relates to an oil copper corrosion detection method and device for an oil cooling motor, and belongs to the technical field of oil cooling motor corrosion and protection.
Background
The new energy automobile has higher and higher requirements on the power density of the motor, and the heat dissipation efficiency of the motor is higher than that of the traditional water cooling mode by adopting an oil cooling system to directly cool the motor, so that the oil cooling becomes the main cooling trend of the new generation motor. But the oil cooling is equivalent to that the oil product directly contacts with the motor body, and the new operation condition puts higher requirements on the gearbox oil, such as corrosion risk on motor materials after the oil product is aged.
GB/T5096 copper sheet corrosion test method for petroleum products prescribes a test method for evaluating the copper corrosion degree of petroleum products, so the copper corrosion test is an important index for evaluating the corrosion performance of petroleum products. However, the conventional corrosion test cannot reflect the corrosion condition of the lubricating oil for the oil-cooled motor of the new energy automobile under the actual working condition; therefore, the lubricating oil products cannot be rapidly assessed and screened, and the rapid development requirement of new energy automobiles cannot be met.
Disclosure of Invention
In order to solve the problems, the method and the device for detecting the copper corrosion of the oil product for the oil cooling motor are provided, and the square wave voltage is applied between the two copper bar electrodes, so that the appearance changes of the two copper bar electrodes and the oil product before and after aging are observed, the volume resistivity changes and the copper content changes of the oil product before and after aging are measured, the corrosion performance of the oil product for the oil cooling motor is evaluated, and a method basis is provided for selecting the oil product for the oil cooling motor of a new energy automobile.
The invention adopts the following technical scheme:
according to one aspect of the application, there is provided a method for detecting copper corrosion of an oil product for an oil-cooled motor, comprising the steps of:
(1) Firstly, connecting two polished copper bar electrodes with two poles of an input voltage respectively, and then immersing the two copper bar electrodes into an oil product;
(2) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 200+/-50 ns, the duty ratio is 50%, and after aging for 24 hours, the two copper bar electrodes after testing are taken out;
(3) And judging whether the oil product for the oil cooling motor is qualified or not by observing the appearance changes of the two copper bar electrodes and the oil product before and after the test and measuring the volume resistivity changes and the copper content changes of the oil product before and after the test.
Optionally, in the step (2), the temperature of the oil product is between-40 and 200 ℃.
Optionally, in the step (2), the water content of the oil product is 1500-2500 ppm during testing.
Alternatively, the distance between the two copper bar electrodes is 4-10mm.
Optionally, the width of the copper bar electrode is 20+/-5 mm, the thickness is 3-5mm, and the length is 100+/-5 mm.
Optionally, the copper bar electrode is electrolytic copper with purity of more than 99.9%.
Alternatively, the oil is an ATF oil.
Optionally, in the step (1), the copper bar electrode is polished according to a GB/T5096 petroleum product copper sheet corrosion test method, so that the efficiency is high, the effect is good, and the subsequent test requirements are met.
According to still another aspect of the present application, there is provided an oil copper corrosion detection device for an oil-cooled motor, the detection device comprising: the oil tank comprises an oil tank body and two copper bar electrodes, wherein the oil tank body is filled with oil products, and the two copper bar electrodes are immersed in the oil products;
an insulating sealing cover is arranged on the top cover of the oil containing tank body, and two test electrodes for inputting voltage are connected with two copper bar electrodes through the insulating sealing cover;
and heating resistance wires are arranged around the oil containing groove body.
Optionally, an electromagnetic stirrer is arranged at the bottom of the oil containing tank body.
In the present application, "ATF oil" refers to automatic transmission oil, and the type and manufacturer of ATF oil are not particularly limited in this application.
Benefits of the present application include, but are not limited to:
1. according to the oil product copper corrosion detection method for the oil cooling motor, square wave voltage is applied between the two copper bar electrodes, the two copper bar electrodes serve as positive and negative electrodes of output voltage and serve as corrosion test pieces of corrosion tests, and the corrosion performance of the oil product for the oil cooling motor is evaluated by observing the appearance changes of the two copper bar electrodes and the oil product before and after aging and measuring the volume resistivity changes and the copper content changes of the oil product before and after aging, so that a method basis is provided for selecting the oil product for the oil cooling motor of a new energy automobile.
2. In the oil copper corrosion detection method for the oil cooling motor, the proper voltage peak value, frequency, pulse duration and duty ratio are selected, so that the testing process is infinitely close to the actual running working condition of the motor, the accuracy of a testing result is ensured, and the oil for the oil cooling motor of the new energy automobile is more reasonably selected.
3. According to the oil copper corrosion detection method for the oil cooling motor, the copper bar electrode with proper size and purity is selected, and oil products with proper types, water content and temperature are matched, so that the corrosion performance of the oil products under various operation conditions can be comprehensively evaluated, and the integrity and accuracy of test results are improved.
4. The utility model provides an oil copper corrosion detection device for oil cooling motor, simple structure, the modern design through setting up heating resistor silk and electromagnetic stirrer, guarantees that the oil temperature and the water content of each position in the oil groove body are uniform stable, improves test result accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic structural diagram of an oil copper corrosion detection device for an oil cooling motor according to an embodiment of the present application.
List of parts and reference numerals:
1. the device comprises an oil containing tank body, a copper bar electrode, an insulating sealing cover, a test electrode, a heating resistance wire, an electromagnetic stirrer and an electromagnetic stirrer.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The raw materials or instruments used are conventional products available commercially without identifying the manufacturer.
In this application, square wave voltage is applied between two copper bar electrodes through a square wave voltage generator, and the model of the square wave voltage generator adopted below is XH-3D.
Fig. 1 shows a schematic structural diagram of an oil copper corrosion detection device for an oil cooling motor, which is provided by the application, and the detection device comprises: the oil-filled type oil tank comprises an oil-filled tank body 1 and two copper bar electrodes 2, wherein the oil-filled tank body 1 is filled with oil products, and the two copper bar electrodes 2 are immersed in the oil products; the top of the oil containing tank body 1 is covered with an insulating sealing cover 3, and two test electrodes 4 for inputting voltage of the square wave voltage generator are connected with two copper bar electrodes 2 through the insulating sealing cover 3; heating resistance wires 5 are arranged around the oil containing tank body 1; the bottom of the oil containing tank body 1 is provided with an electromagnetic stirrer 6.
Further, the distance between the two copper bar electrodes 2 is 4-10mm; preferably 7mm.
Further, the width of the copper bar electrode 2 is 20+ -5mm; preferably 20mm; the thickness is 3-5mm; preferably 4mm; the length is 100+/-5 mm; preferably 100mm.
Specifically, the copper bar electrode 2 is electrolytic copper with a purity of more than 99.9%.
The oil corrosion performance of the oil cooling motor is tested by adopting the preferable conditions of the detection device.
Example 1
The method for detecting copper corrosion of the oil product for the oil-cooled motor comprises the following steps:
(1) Polishing the copper bar electrode according to a GB/T5096 petroleum product copper sheet corrosion test method;
(2) Connecting the two polished copper bar electrodes with the positive electrode and the negative electrode of the input voltage of the square wave voltage generator respectively, and immersing the two copper bar electrodes in ATF oil 1#;
(3) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 150ns, the duty ratio is 50%, meanwhile, the temperature of an oil product is controlled to be 25 ℃, the water content is 1500ppm, and the two copper bar electrodes after aging for 24 hours are taken out after testing;
(4) The color of the two copper bar electrodes is observed to be deepened, which indicates that the copper bar is corroded under the square wave voltage condition, and the color of the oil is observed to be deepened, which indicates that the oil is easy to be oxidized and deteriorated under the square wave voltage condition, and has poor chemical stability; further, the volume resistivity of the oil product before and after the test is reduced by 51%, which indicates that the insulation performance of the oil product is reduced under the square wave voltage condition, and the insulation failure risk exists when the oil product is applied to a motor in the actual working condition; the copper content in the oil product is increased by 960ppm before and after the test, which indicates that the corrosion degree of the oil product to the copper bar is higher; therefore, the oil product is unqualified and can not be applied to the oil cooling motor of the new energy automobile.
Example 2
The method for detecting copper corrosion of the oil product for the oil-cooled motor comprises the following steps:
(1) Polishing the copper bar electrode according to a GB/T5096 petroleum product copper sheet corrosion test method;
(2) Connecting the two polished copper bar electrodes with the positive electrode and the negative electrode of the input voltage of the square wave voltage generator respectively, and immersing the two copper bar electrodes in ATF oil 2#;
(3) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 250ns, the duty ratio is 50%, meanwhile, the temperature of an oil product is controlled to be 155 ℃, the water content is 2500ppm, and after aging for 24 hours, the two copper bar electrodes after testing are taken out;
(4) The color of the two copper bar electrodes is observed to be deepened, which indicates that the copper bar is corroded under the square wave voltage condition, and the color of the oil is observed to be deepened, which indicates that the oil is easy to be oxidized and deteriorated under the square wave voltage condition, and has poor chemical stability; further, the volume resistivity of the oil product before and after the test is reduced by 70%, which indicates that the insulation performance of the oil product is obviously reduced under the square wave voltage condition, and the motor has a larger insulation failure risk when being applied to the actual working condition; the copper content in the oil product is increased by 2100ppm before and after the test, which indicates that the corrosion degree of the oil product to the copper bar is high; therefore, the oil product is unqualified and can not be applied to the oil cooling motor of the new energy automobile.
Example 3
The method for detecting copper corrosion of the oil product for the oil-cooled motor comprises the following steps:
(1) Polishing the copper bar electrode according to a GB/T5096 petroleum product copper sheet corrosion test method;
(2) Connecting the two polished copper bar electrodes with the positive electrode and the negative electrode of the input voltage of the square wave voltage generator respectively, and immersing the two copper bar electrodes in ATF oil 3#;
(3) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 180ns, the duty ratio is 50%, meanwhile, the temperature of an oil product is controlled to be 120 ℃, the water content is 1800ppm, and after aging for 24 hours, the two copper bar electrodes after testing are taken out;
(4) The color of the two copper bar electrodes is observed to be deepened, which indicates that the copper bar is corroded under the square wave voltage condition, and the color of the oil is observed to be deepened, which indicates that the oil is easy to be oxidized and deteriorated under the square wave voltage condition, and has poor chemical stability; further, the volume resistivity of the oil product is reduced by 63% before and after the test, which means that the insulation performance of the oil product is reduced under the square wave voltage condition, and the insulation failure risk exists when the oil product is applied to a motor in the actual working condition; the copper content in the oil product is increased by 1600ppm before and after the test, which indicates that the corrosion degree of the oil product to the copper bar is higher; therefore, the oil product is unqualified and can not be applied to the oil cooling motor of the new energy automobile.
Example 4
The method for detecting copper corrosion of the oil product for the oil-cooled motor comprises the following steps:
(1) Polishing the copper bar electrode according to a GB/T5096 petroleum product copper sheet corrosion test method;
(2) Connecting the two polished copper bar electrodes with the positive electrode and the negative electrode of the input voltage of the square wave voltage generator respectively, and immersing the two copper bar electrodes in ATF oil 4#;
(3) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 200ns, the duty ratio is 50%, meanwhile, the temperature of an oil product is controlled to be 150 ℃, the water content is 2000ppm, and the two copper bar electrodes after aging for 24 hours are taken out after testing;
(4) The color of the two copper bar electrodes is observed to be not obviously changed, so that the copper bar is slightly corroded under the square wave voltage condition, and the color of the oil is observed to be slightly deepened, so that the oil is not easy to oxidize and deteriorate under the square wave voltage condition, and the chemical stability is good; further, the volume resistivity of the oil product is reduced by 20% before and after the test, which shows that the insulation performance of the oil product is not obviously reduced under the square wave voltage condition, and the oil product can not have great influence on the motor when being applied to the actual working condition; the copper content in the oil product is increased by 20ppm before and after the test, which indicates that the corrosion degree of the oil product to the copper bar is lower; therefore, the oil product is qualified, and can be applied to the oil cooling motor of the new energy automobile.
Example 5
The method for detecting copper corrosion of the oil product for the oil-cooled motor comprises the following steps:
(1) Polishing the copper bar electrode according to a GB/T5096 petroleum product copper sheet corrosion test method;
(2) Connecting the two polished copper bar electrodes with the positive electrode and the negative electrode of the input voltage of the square wave voltage generator respectively, and immersing the two copper bar electrodes in ATF oil 4#;
(3) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 800Vpk, the frequency is 20kHz, the pulse duration is 300ns, the duty ratio is 20%, meanwhile, the temperature of an oil product is controlled to be 300 ℃, the water content is 500ppm, and the two copper bar electrodes after aging for 24 hours are taken out after testing;
(4) The color of the two copper bar electrodes is observed to be deepened, which indicates that the copper bar is corroded under the square wave voltage condition, and the color of the oil is observed to be deepened, which indicates that the oil is easy to be oxidized and deteriorated under the square wave voltage condition, and has poor chemical stability; further, the volume resistivity of the oil product before and after the test is reduced by 86%, which indicates that the insulation performance of the oil product is obviously reduced under the square wave voltage condition, and the motor has a larger insulation failure risk when being applied to the actual working condition; the copper content in the oil product is increased by 3300ppm before and after the test, which indicates that the corrosion degree of the oil product to the copper bar is high; therefore, the oil product is unqualified and can not be applied to the oil cooling motor of the new energy automobile.
Based on the test, the chemical stability of the oil product and the corrosion degree of the oil product on the copper bar can be comprehensively evaluated when the 800V high-voltage motor actually runs, so that the oil product for the oil cooling motor of the new energy automobile can be more reasonably selected.
The foregoing is merely exemplary of the present application, and the scope of the present application is not limited to the specific embodiments, but is defined by the claims of the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.
Claims (8)
1. The method for detecting copper corrosion of the oil product for the oil-cooled motor is characterized by comprising the following steps of:
(1) Firstly, connecting two polished copper bar electrodes with two poles of an input voltage respectively, and then immersing the two copper bar electrodes into an oil product;
(2) Square wave voltage is applied between the two copper bar electrodes, wherein the voltage peak value is 1100Vpk, the frequency is 10kHz, the pulse duration is 200+/-50 ns, the duty ratio is 50%, and after aging for 24 hours, the two copper bar electrodes after testing are taken out;
(3) Judging whether the oil product for the 800V high-voltage motor is qualified or not by observing the appearance changes of the two copper bar electrodes and the oil product before and after the test and measuring the volume resistivity changes and the copper content changes of the oil product before and after the test;
wherein, the temperature of the oil product is-40-200 ℃ during the test; the two copper bar electrodes are used as positive and negative electrodes of output voltage and also used as corrosion test pieces for corrosion tests.
2. The method for detecting copper corrosion of an oil product for an oil-cooled motor according to claim 1, wherein in the step (2), the water content of the oil product at the time of the test is 1500 to 2500ppm.
3. The method for detecting copper corrosion of oil products for oil-cooled electric motors according to claim 1, wherein the distance between the two copper bar electrodes is 4-10mm.
4. The method for detecting copper corrosion of oil products for oil-cooled motors according to claim 1, wherein the width of the copper bar electrode is 20+ -5mm, the thickness is 3-5mm, and the length is 100+ -5 mm.
5. The method for detecting copper corrosion of oil products for oil-cooled electric motors according to claim 1, wherein the copper bar electrode is electrolytic copper with a purity of more than 99.9%.
6. The method for detecting copper corrosion of an oil product for an oil-cooled motor according to claim 1, wherein the oil product is ATF oil.
7. The method for detecting copper corrosion of oil products for oil-cooled motors according to claim 1, wherein in the step (1), the copper bar electrode is polished according to a copper sheet corrosion test method of GB/T5096 petroleum products.
8. An oil copper corrosion detection device for an oil-cooled motor, which is applied to the detection method of claim 1, and is characterized in that the detection device comprises: the oil tank comprises an oil tank body and two copper bar electrodes, wherein the oil tank body is filled with oil products, and the two copper bar electrodes are immersed in the oil products;
an insulating sealing cover is arranged on the top cover of the oil containing tank body, and two test electrodes for inputting voltage are connected with two copper bar electrodes through the insulating sealing cover;
heating resistance wires are arranged around the oil containing tank body;
an electromagnetic stirrer is arranged at the bottom of the oil containing tank body;
the two copper bar electrodes are used as positive and negative electrodes of output voltage and also used as corrosion test pieces for corrosion tests.
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| CN202211333347.9A CN115615912B (en) | 2022-10-28 | 2022-10-28 | Method and device for detecting copper corrosion of oil product for oil-cooled motor |
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