Description of the national standard for the alternating salt spray test of electronic products
GB/T 2423.18-2000 is a standard designed to evaluate the suitability of components and equipment for use or storage in salty and humid environments. It serves as a corrosion test method, particularly useful for assessing the degradation of non-metallic materials caused by salt spray exposure. Additionally, it helps determine how the performance of electronic components and devices might change under such environmental conditions.
The corrosion process for metallic materials is typically electrochemical in nature, while non-metallic materials are affected by complex chemical reactions between the salt and the material itself. The rate at which damage occurs depends heavily on factors such as the temperature of the salt solution, the surface condition of the test sample, and the ambient temperature and humidity during testing.
During the test, the sample is exposed to salt spray long enough to ensure full wetting. After a period of damp heat storage, the spraying process is repeated. This alternating approach simulates natural salt spray conditions to some extent, making it a practical method for evaluating long-term environmental effects.
Although this test is more accelerated than typical real-world conditions, the acceleration factor varies depending on the type of sample being tested. Therefore, results should be interpreted with care, considering the specific characteristics of each component.
The test consists of two main stages: salt spray exposure and moist heat storage. Throughout both phases, the test samples are generally not powered. This standard is equivalent to the international standard IEC 68-2-52 (1984), titled "Test Kb: Alternating Salt Spray Test Method."
This method provides a reliable way to assess the resistance of electronic products to corrosive environments, ensuring their reliability and durability in harsh climates. Understanding the procedure and its limitations is essential for accurate evaluation and proper application in quality control and product development processes.
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