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Aluminum Electrolytic Capacitors Failure Mode and Factors Overview
2018-1-2

The cathode of the aluminum electrolytic capacitor, the cathode lead-out electrode and the shell are made of high-purity aluminum. The medium of the aluminum electrolytic capacitor is an aluminum oxide film formed on the surface of the cathode.

The real negative is the electrolyte, working quite a cell, but the anode surface of the anodic oxide layer has been formed.

Electrochemical reaction no longer occurs, in theory, the current is zero.

Due to the presence of impurities in the electrode and electrolyte, will cause a small leakage current.

Phenomenon seen from the electrolytic aluminum electrolytic capacitors common failure and failure modes are: dry electrolyte, pressure relief device action, short circuit, open circuit (no capacity), leakage current is too large.

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