Removing Copper oxidation

no. the problem with soldering is not high current, it is the mechanical stiffening which means that its very likely to fracture where the solder stops..

Reply to
The Natural Philosopher
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No that's cupric oxide.

Or at lest let'ssay there are two copper oxides, one red, one black, and both may be referred to as copper oxide. Cuprous is the red one. Cupric is the black one.

Reply to
The Natural Philosopher

copper carbonate. Co2 in the air in the presence of water turns copper oxides to copper carbonates. Theres a few more copper salts that pop up too sulphates and acetates - any weak acid will turn the oxide to a salt eventually.

Reply to
The Natural Philosopher

A 6" spring to sheath the finished joint might be better. If one can stop it sliding out of position.

Reply to
orion.osiris

At our old house where the copper CH pipes went into the floor (concrete) the pipes were stained green about a half-inch above the cement. Why would it be occurring just there?

Reply to
Tim Streater

Dunno off hand. Mortar can be quite alkaline, and I would guess that it's something to do with the alkalinity of the cement coupled with straightforward oxidation of the copper. I've seen similar sort of thing when solder flux is also involved, and I believe it's now good practice to wrap all soldered joints in copper pipes with something like Denso tape if they're going to be buried in concrete.

Having said all that, Googling for 'concrete attack copper' gives a variety of answers, many of them saying that copper isn't attacked by concrete.

Reply to
Chris Hogg

Well actually copper pipe buried in concrete is attacked, but not chemically, it's a physical effect. The ch pipes expand and contract as they warm and cool, and the copper is abraded by the concrete. This is why the advice is to sleeve the pipe before pouring the concrete.

AWEM

Reply to
Andrew Mawson

And see all that Southern Railway rolling stock in malachite green. :-)

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Reply to
polygonum

best place for condensation.

Reply to
The Natural Philosopher

Inspiring! I'm now on ebay trying to source a malachite coloured roller-neck jumper and some bright red flares to set it off.

Reply to
orion.osiris

...and copper melts at 1085 deg C

Reply to
The Other Mike

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