This standard specifies the thermal cycle test method and test equipment for electroplated layers on plastic substrates. This standard is applicable to the evaluation of the resistance of electroplated layers on plastics to temperature changes, and the test results indicate the bonding strength between the electroplated layer and the substrate of the electroplated part. GB/T 12610-1990 Thermal cycle test for electroplated layers on plastics GB/T12610-1990 Standard download decompression password: www.bzxz.net
This standard specifies the thermal cycle test method and test equipment for electroplated layers on plastic substrates. This standard is applicable to the evaluation of the resistance of electroplated layers on plastics to temperature changes, and the test results indicate the bonding strength between the electroplated layer and the substrate of the electroplated part.

National Standard of the People's Republic of China
Electroplated coatlngs
on plastcs materials... Thermal cycling testThis standard refers to and adopts the international standard IS0452-1985% metal grain cover cycle test".
1 Subject content and scope of application
CB/T 12610-90
8.6 and 10.4 Thermal This standard specifies the thermal cycling test method and test equipment for the electroplated layer on the plastic substrate. This standard is applicable to the evaluation of the temperature change resistance of the electroplated layer on the plastic, and the test results indicate the bonding strength between the coating and the substrate of the electroplated part.
2 Principle of the method
Due to the different thermal expansion coefficients of the plastic substrate and the metal coating, a stress will be generated on the interface between them when the temperature changes. When the temperature changes repeatedly between high and low, the total stress at the interface will increase significantly: when the local stress exceeds the bonding strength of the plastic and metal layers, blistering, wrinkling, cracking or shedding will occur. This standard adopts a high-temperature cycle test procedure to observe the defects on the surface of the plated parts after the test to evaluate the bonding ability of the electroplating layer and the plastic body. 3 Test equipment
3.1 Electric heating oven-temperature control range greater than 75°C. Temperature accuracy ±2°C. 3.2 Low temperature oven temperature range is less than -10°C, temperature control accuracy +2°C. 4 Specimens
4.1 After electroplating, the specimens are placed at a temperature for 24 hours before testing. 4.2 The number of specimens for each test should generally not be less than 3. The specimen should be a complete molded part. It is not allowed to cut a part from a large plated part for testing: large parts can be replaced by small parts made of the same material as the large parts and then electroplated under the same conditions for testing. 4.3 The specimen should be fully cleaned before testing. Solvents and abrasives that will corrode the specimen should not be used during milling. 4.4 The test piece should be placed in the test box and should not be connected to the box body or to each other. 5 Tests
5.1 Thermal cycle test conditions
A cycle: upper limit temperature 75±2°C, lower limit temperature 20±5°C; B cycle: upper limit temperature 75+2°C, lower limit temperature -20±2°C; C cycle: upper limit temperature 752°C, lower limit temperature -402°C. 5.2 Test procedures for each cycle of various cycles 5.2.1A Cycle
Approved by the State Administration of Technical Supervision on December 18, 1990 and implemented on December 1, 1991
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a. Place in a drying oven at a temperature of 75±2℃ for 1h1b, and place in a clean environment at a temperature of 20±5℃ for 1h. 5.2.2B Cycle
Place in a low temperature box at a temperature of -20±2℃ for 1h h; Place in a clean environment at a temperature of 20±5°C for 1h; Place in a drying oven at a temperature of 75±2°C for 1h; Place in a clean environment at a temperature of 20±5°C for 1h, 5.2.3 Cycle
Place in a low temperature box at a temperature of -40±2°C for 1h; Place in a clean environment at a temperature of 20+5°C for 1h; Place in a drying oven at a temperature of 75±2°C for 1h
Place in a clean environment at a temperature of 20±$°C for 1h, 5.3 The type of thermal cycle test and the number of cycles shall be determined in accordance with the product standard or the requirements of the purchaser. Evaluation of test results bZxz.net
The evaluation criteria for test results shall be in accordance with the product standard or the requirements of the purchaser. As far as general test requirements are concerned, the sample shall be placed at room temperature for more than 1h after the test, and the defects on the main surface of the test piece, such as blistering, wrinkling, cracks or shedding, shall be visually inspected. 7 Test report
The test report must include the following contents c.
Specify the test method adopted in this standard:
Description of the tested coating or product:
Shape, size, area and surface condition of the test specimen, c.
Number of tests;
Type of test cycle and number of test periods +
Test result evaluation criteria and test results, if necessary, the result of each specimen, the average result of each group of parallel specimens or the sample photo
Additional instructions:
This standard is proposed and managed by the National Metal and Non-metallic Coating Standardization Technical Committee: This standard is drafted by Guangzhou Electric Science Research Institute of the Ministry of Machinery and Electronics, and Hutan Motor Factory, Guangzhou Electroplating Factory, Changchun First Automobile Factory, Wusi Research Institute of the Ministry of Machinery and Electronics, Communication Research Institute, Shanghai Light Industry Research Institute of the Ministry of Light Industry, Foshan University, Hubei Import and Export Commodity Inspection Bureau participated in the drafting. The main drafters of this standard are Jiang Guozhao, Chen Qizhi, and Luo Jingying.
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