"Dennis Monticelli" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- You're probably right, Garey. The thin Cd plating could well be gone now. Ammonium nitrate can attack Cd. I am certainly no chemist either and I don't know what was in that brass polish, but according to a material book I have, intentional stripping of Cd from mild steel or Cu involves KCIO3 with Hydrochloric acid, both at about 5%.
It is also possible for a cadmium-based corrosive layer to develop slowly, build up thickness and in time become self passivated, leaving a layer of pure Cd underneath. It depends upon the nature of the contaminants in the air and the humidity what type of film forms. To stay on the safe side, I would just keep those pins well coated with an anti-oxident. Dennis AE6C On Jan 6, 2008 3:01 PM, Garey Barrell <[EMAIL PROTECTED]> wrote: > > Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > Jim - > > The Jones connector pins are cadmium plated steel. > > I'm certainly no chemist, but I wonder if the ammonia, (present in most > brass polishes,) is what got the cadmium. It sounds like you may be > down to bare steel, which might be a problem in future. > > Old steel chassis used to be cadmium plated, and would grow the same > crud. (Chemical term there.....) I think cadmium plating is now among > the millions of things that have been around hundreds of years which > have now been declared harmful to our health! :-) > > 73, Garey - K4OAH > Glen Allen, VA > > > > > > Jim F. wrote: > > "Jim F." <[EMAIL PROTECTED]> made an utterance to the drakelist gang > > ---------------------------------------------------------------------- > > Results of my experiments: > > > > Tried 3 things to clean the battleship gray, tough as > > nails, oxidation from Jones plug pins that the 12VAC > > filament voltage could not even penetrate. > > > > 1. Craig Deoxit (RS - very expensive) and didn't work > > > > 2. Contact spray (RS) cleaner didn't work > > > > 3. MWW Brass Chrome & metal polish worked. > > > > Got it from the supermarket. It is a gray paste > > that turns oxidation black when left on for a while > > and removes it in chunks with a Q-tip. > > > > The pins were so bad that I had to do it a > > couple of times then clean the residue with RS > > spray contact cleaner and Q-tips. > > > > It's much cheaper than buying and installing > > new 15 pin Jones connectors, if that mounting > > type are even available. > > > > Nice to see shiny metal coming through but don't > > know what to do about the plug receptacle. > > > > Does anyone have a cable mount 15 pin Jones > > receptacle for sale ? > > > > Without the shell is OK as I can use the old one. > > > > Regards, > > > > Jim / W1FMR > > > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
