铝电解电容在湿热环境下的贮存可靠性

针对电子设备中的铝电解电容在贮存环境下的失效问题,通过对铝电解电容进行湿热贮存试验,考察了湿热环境引起的铝电解电容外观状态和电性能的变化,并对试验中出现的失效现象进行了分析.结果表明,铝电解电容在湿热环境下出现了引脚腐蚀和橡胶塞长霉的失效现象;环境温度对铝电解电容贮存可靠性有重要影响,温度超过40℃引脚腐蚀速度会大大加快.温度在30℃适宜霉菌生长,温度超过30℃后没有长霉现象.阳极箔上的阳极氧化膜被腐蚀是铝电解电容在湿热环境下出现电容量和漏电流增大的原因.

Storage Reliability of Aluminum ElectrolyticCapacitors in Hygrothermal Environment

In view of the failure problem of aluminum electrolytic capacitors in storage environment, electrolytic
capacitors were investigated through humid heat test. The influence of hygrothermal environment on the surface state and electric performance of aluminum electrolytic capacitors was evaluated. And the failure phenomena were observed and analyzed. The results showed that corrosion of lead and molds of rubber plug occurred on aluminum electrolytic capacitors in hygrothermal environment. Temperature had great effect on the storage reliability of aluminum electrolytic capacitors. Corrosion rate of lead was accelerated when the temperature was higher than 40. The suitable temperature for molds growth was 30. No mold was found in the rubber plug when temperature was higher than 30. The capacity and leakage current of aluminum electrolytic capacitors increased with storage time, which was caused by the corrosion of aluminum oxide film on anode foil.