GB/T 2423.51-2020 "Environmental Testing—Part 2: Test Methods—Test Ke: Flowing Mixed Gas Corrosion Test" is equivalent to the international standard and is applicable to electrical and electronic products and materials. It focuses on evaluating the corrosion resistance of contact points and connectors in complex corrosive gas environments. The standard specifies four test methods, simulating different corrosive scenarios such as light pollution, industrial areas, and coastal environments through various combinations and concentrations of gases including SO₂, H₂S, NO₂, and Cl₂. It clearly defines key parameters such as temperature, humidity, gas flow rate, and test duration. Compared to the previous version, the new standard introduces special gas options and optimizes test conditions, providing a scientific basis for material selection, process improvement, and anti-corrosion design of products. It is widely applied in industries such as electronics, automotive, and aerospace.