The High Concentration Sulfur Dioxide Test Standard drafted by ORT was authoritatively issued by the State Administration for Market Regulation
The name of the standard:
Environmental Test. Part 2: Test Method. Test Kca: High concentration sulfur dioxide test
Standard No.: GB/T 2423.33-2021
This standard replaces GB/T 2423.33-2005《Environmental test of electrical and electronic products Part 2: Test method test Kca: High concentration sulfur dioxide test》
This standard will be released on May 21, 2021, and will be implemented on December 1, 2021.
This standard is reported under TC8 (National Standardization Technical Committee for Environmental Conditions and Environmental Tests of Electrical and Electronic Products), and TC8/SC2 (Climate Environmental Testing Branch of National Standardization Technical Committee for Environmental Conditions and Environmental Tests of Electrical and Electronic Products) is implemented. The competent authority is the national standardization Management Committee.
The range of standards:
This standard specifies the general conditions and methods for testing samples in the alternating climate of condensed water containing high concentrations of sulfur dioxide, especially for the sulfur dioxide concentration not included in GB/T 9789-2008, so that it can obtain comparable test results when tested in different laboratories.
This standard is applicable to determine the suitability of products and materials used in chemically corrosive environments.
The content of this standard does not include sample shape, sample preparation, and analysis and evaluation of test results. Regarding these provisions, you can consult the relevant standards or negotiate according to the specific situation.
This test cannot be used directly for comparison of corrosion resistance unless the application environment of the anti-corrosion system is similar. Because the corrosion test conditions are very different from the actual application conditions, the corrosion process and the corrosion mechanism are different.
The sample should be placed in the test chamber in the state of being Unpackaged, Non-Operation, "Ready to use", or in the state specified by the relevant specifications.
Test conditions are listed in Table 1. The test conditions listed in Table 1 are partly different from those in GB/T 9789-2008. However, when testing, it is still necessary to consider 6.1, 6.2, and 6.4 of GB/T 9789-2008.
Note: Most of the sulfur dioxide gas introduced at the beginning of the first test phase quickly dissolves into the water at the bottom of the test chamber. Therefore, the effective concentration of sulfur dioxide in the gas space is approximately one-seventh of the theoretical concentration. During the first experimental phase, this starting concentration did not remain constant, but first decreased sharply and then slowly.
At the beginning of the second stage of the test, the heating should be stopped, and the test chamber should be opened or ventilated. After about 1.5H, the test conditions given in Table 1 should be met.
Table 1 Test conditions
Test Kca 1
Test Kca 2
The theoretical concentration of SO2(volume fraction) at the beginning of each test period
The first test phase
8h, including heating.
The second test phase
16h, including cooling (open the test chamber or ventilate)
Exposure conditions in the test chamber
The first test phase
About 100% (condensation water is generated on the sample)
The second test phase
The amount of water at the bottom of the test chamber (volume fraction)
a. In a test chamber with a volume of 300L, the theoretical concentration of sulfur dioxide is equivalent to the amount of sulfur dioxide in each test cycle, 1.0L, and 2.0L respectively.
b. When the volume of the test chamber is 300L, this concentration is equivalent to 2L of water.
Unless otherwise specified, the test cycle shall be selected first from the following cycles: 1, 2, 5, 10, 15, or 20 cycles, one cycle is 24h. If corrosion damage has occurred during the test to an unacceptable level, that is, the appearance or function of the sample has been damaged, the test can be terminated.
Usually, the water and sulfur dioxide gas in the test system should be replaced at the end of each cycle, and the replacement should not interfere with the sample.
Relevant specifications may stipulate that electrical and/or other performance tests should be performed on the samples in the test chamber within 3 hours before the end of each cycle during the test period. After the performance test, it is allowed to open the test chamber to take and place the sample, and the opening time should be as short as possible, and it should be completed within 0.5h before the temp. rise.
1. A strong reducing agent, which has a strong corrosive ability to general non-metallic surface coatings and non-metallic materials; the corrosion to the surface of metal materials is due to the chloride ion penetrating the oxide layer and protective layer of the metal and the interior caused by a chemical reaction of metals.
2. Form strong acid, which has a strong corrosive ability to general non-metal surface coating and non-metal materials.
3. The generated sulfurous acid and sulfuric acid directly destroy the oxide film on the surface of metal products, causing various corrosion effects such as electrochemical corrosion.
The device name/model
Salt spray and corrosion cycling test chamber
Manufacturer: WEISS, Germany
1)Test volume: 450 Itr
2)Salt spray temp. range:+25℃～+50℃
4)Temp. fluctuation: ≤±1℃
5)Temp. uniformity: ≤±2℃
6)Temp. deviation: ≤±2℃
7)Sedimentation of salt fog:(1~2)ml/80cm2.h
8)Function: salt mist test, salt spray and SO2 cyclic test, SO2 condensation test.
9)Equipped with SO2 flowmeter
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