Why do electrolytic capacitors fail after being stored for a long time? |Focus on mid-to-high-end brand capacitor manufacturers

We all know that electrolytic capacitors need to be regularly applied with rated voltage for excitation during long-term storage. Only through this operation can the electrolyte activity be maintained, otherwise the electrolyte in the capacitor will lose activity and age. Once the electrolyte loses activity and ages, Then the electrolytic capacitor also failed. It is precisely because there is an electrolyte that is very easy to change in the electrolytic capacitor, the electrolytic capacitor is very sensitive to chlorine, bromine, etc. Once there is a halide, it may penetrate the inside of the capacitor through the sealing rubber plug and easily cause the capacitor anode corrosion , The acceleration capacitor fails after power-on. Therefore, it is necessary to strictly control the halogen components of relevant sensitive preparations used in the production process. Not only that, after aluminum electrolytic capacitors are stored in a high temperature environment for a long time, a chemical reaction occurs between the capacitor's anodic oxide film and the electrolyte, resulting in a decrease in withstand voltage and an increase in leakage current. When the capacitor is suddenly powered on and the capacitor voltage is close to the rated voltage, it may cause overvoltage failure or excessive leakage current, resulting in overheat failure. Therefore, the storage environment of electrolytic capacitors must be dry and protected from light.

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