Environmental testing for electrical and electronic products - Part 2: Test methods - Test Ka: Salt spray 1 range - This test is applicable to comparing the resistance to salt spray corrosion of specimens with similar structures. This test is also applicable to evaluating the quality and uniformity of protective coatings. When using, the following limitations should be considered: a) This test is not suitable as a general salt spray corrosion test; b) This test is also not applicable to the evaluation of individual specimens used in saline atmospheres. For equipment and components, Test Kb provides more practical test conditions and evaluation methods for individual specimens. However, if in certain cases, in order to ensure quality, relevant regulations require individual specimens to be tested using this test method, the specimens should be tested together with the actual protective equipment (box, lid, outer sleeve, etc.) as a whole component or component of the equipment. 2 Test Equipment 2.1 Test Chamber The materials used in the test chamber should not affect the corrosion effect of salt spray. The structure of the test chamber and the method of providing salt spray can be different, but the following conditions must be met: a) the conditions inside the test chamber are maintained within the specified tolerance; b) The test chamber should have a sufficient volume to provide stable and uniform test conditions (not affected by turbulence), and these conditions should not be affected by the sample during the test process; c) Salt mist cannot be directly sprayed onto the sample; Condensate accumulated on the top, walls, or other parts of the box should not drip onto the sample; e) The test chamber should have good exhaust to prevent pressure increase and ensure uniform distribution of salt mist. The end of the exhaust hole should be protected against wind to avoid generating strong airflow inside the test chamber. 2.2 spray device The design and composition of spray device shall be able to produce fine, wet and dense fog, and the materials of spray device shall not react with salt solution
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