GB/T 2423.33-1989 Basic environmental testing procedures for electrical and electronic products Test Kca: High concentration sulfur dioxide test method GB/T2423.33-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Basic environmental testing procedures for electric and electronic products Test Kca: High consistence sulphur dioxide test1 Subject content and scope of application
GB 2423.33--89
This standard specifies the basic environmental testing procedures for electric and electronic products: High concentration sulphur dioxide test method This standard is applicable to determine the adaptability of electric and electronic products and their materials used in chemically corrosive environments. 2 Requirements for test chambers (rooms)wwW.bzxz.Net
2.1 The sulfur dioxide corrosion gas test chamber (chamber, hereinafter referred to as the corrosion chamber) should be well sealed to prevent the escape of chemical gases. Its effective space should meet the requirements of Articles 3.1 and 3.2 of this standard, and the test chamber must be equipped with appropriate temperature and humidity testing and control devices. 2.2 The accessories and walls of the corrosion box that come into contact with chemical corrosive gases should be made of materials that do not react with sulfur dioxide, do not absorb sulfur dioxide, and do not affect the corrosive effects of the test gas.
2.3 The gas in the effective space of the corrosion box should flow, and the wind speed should not exceed 1m/s. 2.4 The structure of the corrosion box should ensure that condensed water does not drip on the test sample. The corrosion box should also have an exhaust treatment device so that the exhaust gas does not pollute the laboratory and the surrounding atmosphere.
2.5 The functional inspection of the test box shall comply with the provisions of Appendix A (Supplement) of this standard. 3 Test gas
3.1 The concentration of sulfur dioxide gas test is divided into 3 levels, as specified in Table 1. Table 1 Sulfur dioxide gas concentration level
Concentration level
Sulfur dioxide gas concentration mg/L
(calculated at 40℃)
Conditions for calculating concentration
Concentration calculated theoretically at the beginning of each cycle Note: 1) When the percentage concentration is calculated by volume, the concentrations of sulfur dioxide are: 0.067%, 0.33% and 0.67%. 3.2 The sulfur dioxide gas in the test chamber can be obtained by gas transmission from a cylinder or other suitable chemical reaction methods. 4 Initial inspection
Appearance inspection and electrical and mechanical performance inspection should be carried out in accordance with the requirements of relevant standards. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 25, 1989
All non-standard industries are subject to competition
Implementation on January 1, 1990
5 Conditional test
GB2423.33--89
5.1 The test samples should be put into the corrosion box in the unpackaged, unpowered, "ready to use" state or in the state specified in the relevant standards. 5.2 The corrosion test takes 24 hours as a cycle. Each cycle includes four stages: heating, high temperature and high mixing, cooling, and low temperature and high humidity. The heating start is the starting point of the cycle. The temperature, relative humidity and sulfur dioxide gas control of each stage shall be carried out as specified in Table 2. Table 2 Temperature, relative humidity and chemical gas control test phases for each cycle
High temperature and high humidity
Cooling down and low temperature
High humidity phase
18~~28
Rise to 40±2
Lower to 18~28
Relative humidity
Within 1 h after the start of cooling
≥75%
The rest of the time ≥95%
Chemical gas conditions
Start ventilation and control concentration as specified in Table 1
Exhaust within 0.5h after the start of cooling
Complete cooling
5.3 Conditions Before the start of the test, the temperature, relative humidity and chemical gas concentration of the corrosion chamber must be checked to ensure that the test requirements are met. During the test, regular checks must be made to ensure that these conditions meet the test requirements. 5.4 Before heating, place the test samples in the box. The distance between the test samples should be no less than 20mm, the distance between the test samples and the box wall should be greater than 100mm, and the flow of the test gas should not be blocked. 5.5 When the performance of the test samples needs to be measured in the corrosion box, it can be carried out within 3 hours before the end of each cycle. After the performance test, the corrosion box is allowed to be opened to take out the test samples. The opening time should be as short as possible and should be completed 0.5 hours before heating. 5.6 Severity
The test samples should select the sulfur dioxide gas concentration level and the corresponding cycle according to the provisions of the relevant standards, and 1, 2, 5, 10, 15, and 20 cycles are preferred.
6 Intermediate test
The relevant standards may stipulate that the electrical and (or) other performance tests of the test samples should be carried out in the corrosion box within 3 hours before the end of each cycle during the conditional test.
7 Final test
7.1 If there are no other provisions, the electrical performance test of the test samples can be carried out within 3 hours before the end of the last cycle in the corrosion box. 7.2 The appearance inspection and other performance measurements of the test samples can be carried out after the conditioning test is completed, after the test is restored to the normal test atmosphere for 1 to 2 hours as specified in Article 5.3 of GB2421 "General Rules for Basic Environmental Testing Procedures for Electrical and Electronic Products". 8 Details to be given when citing this standard
When the relevant standards adopt this standard, the following items shall be specified: a. sulfur dioxide gas concentration level (see Article 3.1 of this standard); b. inspection and measurement items before the conditioning test (see Chapter 5 of this standard), intermediate test items and conditions (see Chapter 6 of this standard); c.
the cycle of the conditioning test (see Article 5.6 of this standard), d.
the final test items and conditions (see Chapter 7 of this standard). Standard Authorization Search Network A
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GB 2423.33--89
Appendix A
Corrosion effect test of sulfur dioxide gas corrosion test chamber (supplement)
In order to test the test results obtained by the test equipment and the reproducibility of the results obtained by using the same test equipment in different test laboratories, the corrosion effect test of sulfur dioxide gas corrosion test chamber (chamber) must be carried out at an appropriate time, generally at least once a year. The inspection can be carried out in accordance with the provisions of Chapters A1 to A6.
A1 Test Sample
A1.5 The corrosion chamber with a volume of less than 11m2 uses 5 test samples, each of which is made of grade A3 steel plate with a size of 50mm wide, 100mm long, and 0.6~1.5mm thick, and the surface is polished with No. 0 sandpaper. Note: Grade A3 steel plate is equivalent to the foreign grade RRSt1405. Two foil test samples are used in the A1.2 test, each with a size of 250 mm wide, 400 mm long, and 1 mm thick. Its material is the same as that specified in A1.1.
Preparation of A2 test samples
When the volume of the corrosion chamber is greater than 1m\, the test samples in A1.1 and A1.2 must be doubled. Before the start of the corrosion chamber functional test, the test samples specified in A1.1 are degreased with clean gasoline or other suitable solvents, a soft cloth or brush that does not scatter fibers, and then weighed with a balance with an accuracy of 1 mg. If weighing cannot be performed immediately after degreasing, the sample should be placed in a dryer until weighing.
A3 Functional inspection test
Hang the five test samples specified in Article A1.1 vertically in the corrosion box, and hang the two accompanying test samples specified in Article A1.2 on both sides of the test samples. The test samples are subjected to 5 cycles of test. The test is carried out according to the first level of sulfur dioxide gas concentration specified in Chapter 3 of this standard and the conditions specified in Article 5.2.
A4 Removal of corrosion products
After the functional inspection test is completed, use hydrochloric acid with a concentration of about 10% (prepared by adding 230mL of chemically pure hydrochloric acid with a specific gravity of 1.18g/mL to 670mL of distilled water or deionized water) with 0.5% hexamethylenetetramine to remove the corrosion products on the test samples at room temperature. After removing the corrosion products, rinse the test samples thoroughly in distilled water and deionized water, then dry them, and then place them in a desiccator at a room temperature of 15-35℃ until they are weighed.
A5 Weighing of test samples
Weigh the test samples to an accuracy of 1mg. A6 Evaluation of test results
The weight loss of the test samples is converted into g/m2. If the average value is between 100 and 150g/m2, and the deviation between the single value and the average value does not exceed ±20%, the test result is considered to meet the standard requirements. Additional notes:
This standard was proposed and coordinated by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. The main drafters of this standard are Liang Xingcai, Pan Huisheng, Gao Renzhi, Lin Qingshan and Liu Huizhen. 335
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