From: Miike G on

"Conor" <conor(a)gmx.co.uk> wrote in message
news:MPG.2571d9e79ab74f589899b9(a)new.eternal-september.org...
> In article <7mphcsF3j3d4iU1(a)mid.individual.net>, Miike G says...
>
>> Cupro-nickel brake pipes, such as Kunifer, also don't corrode, and don't
>> suffer from age hardening or cracking.
>> Mike. .
>
> And Cupro Nickel are commonly referred to as copper due to their
> colour.....

Only by those who don't know the difference. Anyone who does would never
confuse copper with Cupro-nickel. The colours are totally different.

As copper brake piping is still being sold, it's important IMO to point out
that Cupro-nickel is a nuch more suitable material for brake pipes, and the
two materials shouldn't be confused.
Mike.


From: Clint Sharp on
In message <MPG.2571d9be1e56d82a9899b8(a)new.eternal-september.org>, Conor
<conor(a)gmx.co.uk> writes
>> What's the green stuff at the joints then?
>>
>Oxidisation. They don't rust like steel ones.
>
Umm, no. Copper oxide is generally black AFAIK, the green stuff is
evidence of exposure to something corrosive or an electrolytic reaction.

Rust is oxidized steel.
--
Clint Sharp
From: Duncan Wood on
On Mon, 23 Nov 2009 18:27:10 -0000, Clint Sharp
<clint(a)clintsmc.demon.co.uk> wrote:

> In message <MPG.2571d9be1e56d82a9899b8(a)new.eternal-september.org>, Conor
> <conor(a)gmx.co.uk> writes
>>> What's the green stuff at the joints then?
>>>
>> Oxidisation. They don't rust like steel ones.
>>
> Umm, no. Copper oxide is generally black AFAIK, the green stuff is
> evidence of exposure to something corrosive or an electrolytic reaction.
>
> Rust is oxidized steel.

It depends which copper oxide it is, copper roofs generally go green.
From: Clint Sharp on
In message <op.u3vkqoyyhaghkf(a)lucy>, Duncan Wood <nntpnews(a)dmx512.co.uk>
writes
>On Mon, 23 Nov 2009 18:27:10 -0000, Clint Sharp
><clint(a)clintsmc.demon.co.uk> wrote:
>> Rust is oxidized steel.
Minor correction, rust is oxidised iron, my mistake...
>
>It depends which copper oxide it is, copper roofs generally go green.
That's usually copper carbonate, not an oxide, it's created by exposure
to CO2 dissolved in rainwater (carbonic acid) but the stuff you see on
most modern buildings has been 'helped' to form by the application of
various chemicals so the composition of the green stuff may vary.

--
Clint Sharp
From: Duncan Wood on
On Tue, 24 Nov 2009 09:06:59 -0000, Clint Sharp
<clint(a)clintsmc.demon.co.uk> wrote:

> In message <op.u3vkqoyyhaghkf(a)lucy>, Duncan Wood <nntpnews(a)dmx512.co.uk>
> writes
>> On Mon, 23 Nov 2009 18:27:10 -0000, Clint Sharp
>> <clint(a)clintsmc.demon.co.uk> wrote:
>>> Rust is oxidized steel.
> Minor correction, rust is oxidised iron, my mistake...
>>
>> It depends which copper oxide it is, copper roofs generally go green.
> That's usually copper carbonate, not an oxide, it's created by exposure
> to CO2 dissolved in rainwater (carbonic acid) but the stuff you see on
> most modern buildings has been 'helped' to form by the application of
> various chemicals so the composition of the green stuff may vary.
>

Yes and carbon dioxide also exists at ground level. The old green stuff's
50:50 carbonate & hydroxide.