mistergrumpy
|
| posted on 14/11/07 at 06:28 PM |
|
|
Copper Pipe
Was discussing this the other week with Gav. What with the combination of copper pipe joiners and tees and an alloy header tank and rad. Will there
not be some kind of corrosion risk presumably to the aluminium due to dissimilar metal corrosion? Hmmm
|
|
|
|
|
02GF74
|
| posted on 14/11/07 at 07:05 PM |
|
|
yes there will but should you be worried?
rover v8 is alloy block and was used with copper cored radiator; I am not aware that this caused a problem.
I am sure trhere any many more examples e.g. crossflow: cast iron block, aluminium alloy manifold, copper cored radiator so again, any one know of
probkems casued due to this metal combination?
I am not worried.
|
|
|
mistergrumpy
|
| posted on 14/11/07 at 07:16 PM |
|
|
Just wondered more than anything else. I am aware that there is some kind of corrosion inhibitor in the anti freeze too which would affect things.
|
|
|
bob tatt
|
| posted on 14/11/07 at 08:18 PM |
|
|
what you are refering to is electolitic corosion and as far as i am aware this is only present when you have water on its own without antifreeze is
quite a common problem in plumbing and is overcome by using gun metal fittings i can only assume the automotive world uses a better grade of metal.
|
|
|
indykid
|
| posted on 14/11/07 at 08:52 PM |
|
|
i assumed electrolytic corrosion only happened between two metals in contact.
as in the aluminium has to be in contact with the copper, so if the 2 are joined by a pipe full of water, nothing will happen. the corrosion inhibitor
is to stop the coolant eating the inside of the block/head
more commonly, stainless steel can be isolated from aluminium when riveting by dipping the rivets in sealer to stop the corrosion. if it wasn't
the stainless would soon rot the rivets.
clear as mud i know...
tom
|
|
|
llionellis
|
| posted on 14/11/07 at 10:01 PM |
|
|
This gives quite a good explanation
http://en.wikipedia.org/wiki/Galvanic_corrosion.
|
|
|
britishtrident
|
| posted on 15/11/07 at 08:03 AM |
|
|
Just use a 55% solution quality antifreeze all year round.
If the system has been cleaned out completly use an longlife OAT coolant but keep in mind you can't mix it with the conventional blue/green
antifreezes.
|
|
|
RazMan
|
| posted on 15/11/07 at 09:27 AM |
|
|
Electrolytic corrosion can only happen in a relatively dry joint between dissimilar metals - I think we are talking about a cooling system filled with
water that will dissipate any electrical charge so it wouldn't apply.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
