----- Original Message -----
From: "Steve Berg" <wa9...@tbc.net>
To: <drakelist@zerobeat.net>
Sent: Tuesday, September 06, 2011 11:05 AM
Subject: Re: [Drakelist] Copper chassis restoration
I have not tried it on a Drake chassis, but have had good
performance with a product called Nevrdull. It comes in a
can and is cotton wadding with some sort of solvent on it.
It is non abrasive, and does a great job on silverware and
Harley exhaust pipes.
Steve WA9JML
I have no idea what is in Nevrdull, its MSDS is
probably on the web. However, most corrosion removers
contain either oxalic acid or phosphoric acid as the active
ingredient. They may also contain a surfactant or detergent
and a polish of some sort. The polish can be very fine rouge
or something softer like powdered pumice or French chalk.
Phosphoric acid is also found in many bathroom tile cleaners
and mold removers. These will remove oxidation about as well
as the more specialized products. While its possible some
cleaners contain other chemicals these two reducing agents
seem to be the most popular.
One problem with copper plated chassis is that they may
have been coated with a lacquer. If the lacquer coating
flakes off for some reason it will allow the unprotected
copper to oxidize plus the oxidation can migrate under the
remaining lacquer. Too much of any cleaner can begin to
remove the plating.
I think the main purpose of the copper plating is to
reduce surface resistance. I have no idea of how effective
this is in practice.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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