Outdoor LED lamps often encounter uncontrolled lamps or lamp failures, especially after heavy rain. Why does this happen? The main reason is the waterproof problem. Waterproof is the key issue of outdoor lighting products. It determines whether outdoor lighting products can be used stably outdoors for a long time.
Most of the light sources used in traditional lamps are AC powered, but LED products are powered by DC, and DC power will cause electrochemical corrosion when exposed to water or vapor.
Galvanic cell corrosion
The conductive part and welding part of the lamp are mainly copper and tin. Tin is mainly used for welding. If water enters the lamp, the galvanic cell corrosion will occur when there is no space. Long-term corrosion of the inside of the lamp after water has caused the tin to be slowly corroded, and "frozen welding" occurs. This is why there are problems when it rains, and it is good when it is sunny, and it is difficult to perform maintenance. It is difficult to guarantee the integrity of the entire project when it appears.
Electrolytic cell corrosion
Outdoor lighting products must consider the corrosion of the lamp shell. If sodium chloride is attached to the surface of the lamp shell, the primary battery will be severely corroded. Therefore, the seaside area needs to consider the rust and corrosion protection of the lamp surface. When the interior of the lamp is energized, the electrolytic cell will corrode. The positive and negative electrodes will have a very strong reaction, which will cause the tin to be quickly dissolved, and then the copper will be dissolved. It is well known that this kind of corrosion occurs, as long as it is an active metal. Corroded away.
