Effect of Chloride Ion on the Behaviour of Electrolytic Capacitor

Abstract

Aluminum electrolytic capacitors up to 100 working volt, contaminated
intentionally with chloride ions, thtough the electrolytic
solution were studied. This systematic comparative study was undertaken
on the adverse effects of chloride ions on these capacitors,
impregnated with 0.4, 0.5, 0.8, 1, 2, 5, 10, 20, 50, 100, 200, 500,
1000 ppm chloride contaminated electrolyte along with uncontaminated
electrolyte. The life test of the capacitors was carried out at
85°C up to 2000 h. For these low voltage capacitors the detrimental
effect is negligible up to 50 ppm and no remarkable change is
observed compared to the uncontaminated electrolyte. Higher chloride
concentration has destructive effect in its life test, even in the
manufacturing process due to severe anode corrosion, observed
thtough photomicrograph. All supporting electrical parameters including
ESR of these capacitors have been done extensively in the
present article.