This standard specifies the sample preparation, operation steps and calculation of test results for the electrical corrosion test method of insulating adhesive tape. This standard is applicable to the determination of the electrical corrosion coefficient of insulating adhesive tape. GB/T 15333-1994 Electrical corrosion test method for insulating adhesive tape GB/T15333-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for electrolysis corrosion of electrical insulating adhesive tapes
Test method for electrolysis corrosion of electrical insulating adhesive tapesSubject content and scope of application
GB/T15333—94
This standard specifies the sample preparation, operation steps and calculation of test results for the test method for electrolysis corrosion of electrical insulating adhesive tapes. This standard is applicable to the determination of the electrical corrosion coefficient of insulating adhesive tapes. 2 Terminology
Electrolysis corrosion coefficient of adhesive tapes—With a copper wire as an electrode and the adhesive on the adhesive tape as an electrolyte, electricity is passed under specified conditions, the anode copper wire produces an oxidation reaction and the cathode copper wire produces a reduction reaction. After the electrolysis reaction, the ratio of the breaking force of the anode copper wire to the cathode copper wire is called the electrical corrosion coefficient of the adhesive tape.
3 Reference standards
GB 3953
Electrical round steel wire
4 Test equipment, devices and materials
4. 1 Straight voltage regulated power supply
The power supply voltage is 250±5V. To prevent short circuits that may be caused during the test, the power supply should be equipped with an overcurrent automatic alarm and cut-off device.
4.2 Sealed glass container
A glass container with an insulating sealed cover, with a volume of 5L and a height of about 270mm. The sealed cover can be made of a hard insulating board. 4.3 Sample board
The sample board is made of a hard insulating board, and its dimensions are shown in Figure 1. The surface of the sample board is engraved with two parallel semicircular grooves with a spacing of 6mm, a depth of 0.1mm and a width of 0.2.
Approved by the State Administration of Technical Supervision on December 22, 1994, and implemented on October 1, 1995
CB/T1533394
Figure 1 Sample
4.4 Rolling device
The rolling device is shown in Figure 2. The mass of the roller is 2000±50g, and the surface of the roller should be covered with a rubber layer with a thickness of 6mm and a hardness of 60±5 degrees (Shore A).
Rubber layer
Figure 2 Pressing device
4.5 Tensile testing machine
The testing machine should make the damage load of the bare copper wire between 15% and 85% of the full scale, and should be able to ensure that the moving speed of the clamp is 100±5mm/min, and the minimum load division is below 0.1N. 4.6 Electric heating air blast thermostat
Electric heating air blast thermostat should be able to keep the temperature stable within the range of 50±1℃. 4.7 Copper wire
Bare copper wire should comply with the provisions of GB3953, with a diameter of 0.18~~0.20mm. 4.8 Acetate fiber cloth
Acetate fiber cloth with the brand of S9585 should be used. 5 Test specimens
5.1 The size and composition of the test specimens are shown in Figure 3. 25Www.bzxZ.net
5.2 The number of test specimens shall not be less than 7.
6 Test specimen preparation
GB/T 15333—94
Insulating adhesive tape
Figure 3 The size and composition of the test specimens
6.1 The test specimen preparation should be carried out in a clean laboratory. Sugar acid fiber agent
6.2 Use clean absorbent gauze dipped in alcohol or acetone to wipe the sample board, rinse the acetate cloth with distilled water, and do not touch it directly with your hands after drying. 6.3 Place the 150mm long and 25mm wide acetate cloth that has been dried in the middle of the sample board, and then place two bare copper wires with a diameter of 0.18~0.20mm on the acetate cloth. Use appropriate force on both sides of the bare copper wire to straighten the bare copper wire, place it in the parallel semicircular groove of the sample board, and fix the bare copper wire on the sample board with adhesive tape. 6.4 Remove the outer 3~5 layers of the adhesive tape, remove the 150mm long and 25mm wide adhesive tape, and make a sample according to the bonding method shown in Figure 4. Then use a rolling device to roll back and forth on the sample board along the direction of the bare copper wire for 5 times. When rolling, it should be noted that the bare copper wire cannot be twisted and the acetate cloth cannot be wrinkled. During lamination, the hands cannot directly touch the lamination surface, and the sample after rolling should be tightly fitted. 6.5 The length of the prepared sample is 150mm and the width is 25mm. A lead wire of sufficient length should be retained at one end of the sample to connect to the power supply. Note: When the width of the insulating adhesive tape is less than 10tmm, it should be overlapped to 25mm width. The overlap situation should be noted in the test report. H
Insulating adhesive tape
Figure 4 Lamination method
Soft dotted line
Acetate sliver cloth
Hard insulation board
7 Test steps
GB/T15333-94
7.1 Pour 500mL of distilled water into the glass container shown in Figure 5, and then hang the sample prepared according to Chapter 6 into the glass container. A pair of electrodes is allowed to hang 7 samples. The sample is in a sealed glass container. One bare copper wire is connected to the positive pole of the power supply, and the other bare copper wire is connected to the negative pole of the power supply. The sample should be in a free state, and should not be wetted by the distilled water in the container, nor should it contact the wall of the container, nor should it contact each other. +
Figure 5 Electrocorrosion Test Device
Yellow Steel Electrode
Help Close Drawing
Glass Container
7.2 Place the glass container containing the sample in an electric blast thermostat with a temperature stabilized at 50±1℃. Be careful when placing it in, so as not to let the distilled water in the glass container wet the sample. Then connect the DC regulated power supply to the terminal on the lid of the sealed glass container. Preheat for half an hour, turn on the power supply and start calculating the test time. The test voltage is 250±5V, and the test time is 20h. 7.3 After the test, take out the sample. Carefully peel off the adhesive tape and acetate cloth, remove the bare copper wire, and distinguish the anode bare copper wire and the cathode bare copper wire.
7.4 Protect the two ends of the removed bare steel wire with paper, and then put it into the clamp of the tensile testing machine to measure the tensile strength of the anode bare copper wire and the cathode bare copper wire respectively. The effective test length of the bare copper wire is 100mm (see Figure 6), and the moving speed of the clamp is 100±5mm/min. Figure 6 Tensile clamp
8 Test results
The electrical corrosion coefficient of the adhesive tape is calculated as follows: Where: K adhesive tape electrical corrosion coefficient,
F+—anode bare copper wire tensile strength, N,
F_—cathode bare copper wire tensile strength, N.
GB/T 15333-94
The test results are expressed as the average, maximum and minimum values ​​of 7 samples, with two significant figures. When the average value is greater than 1, it is 1. 9 Test report
The test report should include the following contents:
Specifications, brand, manufacturer and manufacturing date of the adhesive tape: substrate and adhesive type used for the adhesive tape: test conditions and test date,
Average, maximum and minimum values ​​of the electrical corrosion coefficient of the adhesive tape and other contents to be explained.
Additional explanation:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Adhesive Standardization Technical Committee. This standard is drafted by the Shanghai Rubber Products Research Institute. The drafters of this standard are Chen Xiufen and Yue Keshen.
When this standard is issued and implemented, the original ministerial standard HG4-1550-84 "Test method for electrical corrosion of insulating adhesive tape" shall be abolished.
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