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In Reply to: RE: Capacitor leak posted by Eli Duttman on May 08, 2017 at 20:42:32
I've never seen mention of strong alkali in capacitor's electrolye. In fact strong alkali are highly corrosive to aluminum, same as strong acids.
In early capacitors, electrolyte was solution of boric acid in glycerol. Nowadays they use ammonium tetraborate solution in ethylene glycol for regular capacitors, and in dimethyl formamide for low temperature-rated ones. These electrolytes are not very corrosive, but they can cause shorts if they leak onto other components.
Ethylene glycol is toxic (it is same stuff as antifreeze).
Follow Ups:
IIRC, NaOH was used in, at least, some 'lytics. These days, electrolyte composition is a trade secret. Protective gloves during clean up can't hurt and may be essential.
Eli D.
Can you provide reference to alkaline electrolyte?
Major components of electrolyte, such as ethylene glycol or ammonium tetraborate are not trade secret. Trade secrets are minor additives (anti-corrosion, thickening agents, surfactants, etc.
The memory is old. Remember, caustic = alkaline.
A Google search came up with some links.
https://books.google.com/books?id=ABijBQAAQBAJ&pg=PA314&lpg=PA314&dq=caustic+electrolyte+electrolytic+capacitor&source=bl&ots=8E9LYSC4O1&sig=f0nHHMfzqGJe5vTBVauWkcDgM4w&hl=en&sa=X&ved=0ahUKEwi98PSSlOTTAhVi0oMKHYdGCNwQ6AEIOzAF#v=onepage&q=caustic%20electrolyte%20electrolytic%20capacitor&f=false
http://www.google.ch/patents/EP0229254A2?hl=de&cl=en
Eli D.
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