Why electrolytic capacitors will fail after being left for a long time|Focus on manufacturers of high-end brand capacitors

There is a small amount of water in the electrolytic capacitor of the liquid electrolyte. This water is used to be electrolyzed into hydrogen and oxygen when the pressure resistance of the aluminum electrode is not enough, and then the aluminum oxide electrode increases the pressure resistance. In fact, there are still very small gaps around the rubber ring of the electrolytic capacitor to release excess hydrogen. In fact, the amount of hydrogen is small, but it still needs to be released. Although the moisture in the electrolytic capacitor is very small, it will naturally volatilize and lose if stored for a long time. On the other hand, the aluminum electrode is corroded by the electrolyte, and the aluminum oxide film will become thinner, and the leakage will be revealed when it is working for a long time, and because the loss of moisture cannot be replenished, the electrolytic capacitor cannot restore the original insulation strength. The drying up of the electrolyte causes the capacity of the electrolytic capacitor to be lost. Therefore, electrolytic capacitors that have been stored for more than one year by the manufacturer should be aged or treated as expired products before being sold again.
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