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ef radiator: aluminium or copper core 

 

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Posted: Thu May 03, 2007 8:26 pm 
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care to elaborate richard.. copper or ally ?

i've deffinately seen alot more leaky ally rads then copper.

 

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Posted: Thu May 03, 2007 11:04 pm 
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If copper is more resistant to corrosion than aluminium, does this present a corrosion risk to the block??

In my old xf, some of the hose fittings onto the block were zinc, and corroded quite quickly. I suggested to a mechanical engineer one time I was going to swap them for copper and he said I would be stupid. The zinc fittings were a sacrificial anode to protect the block from electrolytic corrosion. They were MEANT to rust out.

So, with a copper radiator, would the block turn into a sacrifical anode to the radiator? Or are there other fittings on the block which are meant to be the anode?

I'd rather have a sacrificial radiator than a sacrificial block.

 

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Posted: Fri May 04, 2007 12:24 am 
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I'm not positive about this, but wouldnt car manufacturers have a sacrificial anode that doesnt really do anything? if they even needed them at all.

I know the alloy heads on the falcons can get eaten away, and apparently this can be prevented by using good coolant (anti rust and stuff).
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Posted: Fri May 04, 2007 10:08 am 
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its caused by electrolysis (spelling??) where 2 differenent metals react with the electrolyte ie the cooling fluid...alloy head...cast iron block

 

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Posted: Fri May 04, 2007 1:09 pm 
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Well I couldn't help myself, so I looked it up on Google.

Metals which are more electronegative will corrode first.

See
http://www.answers.com/topic/sacrificial-anode

Looks like copper will still corrode first over iron, from the table below. (Smaller number means will corrode first)



H 3.98
Li 3.44
Na 3.16
K 3.04
Rb 2.96
Cs 2.66
Be 2.58
Mg 2.55
Ca 2.55
Sr 2.33
Ba 2.2
Sc 2.19
Ti 2.18
V 2.05
Cr 2.04
Mn 2.04
Fe 2.02 Iron
Co 2.01
Ni 1.96
Cu 1.91 Copper
Zn 1.9 Zinc
B 1.9
Al 1.88 Aluminium
Ga 1.83
In 1.81
Tl 1.78
C 1.66
Si 1.65
Ge 1.63
Sn 1.61
Pb 1.57
N 1.55
P 1.54
As 1.36
Sb 1.31
Bi 1
O 0.98
S 0.95
Se 0.93
F 0.89
Cl 0.82
Br 0.82
I 0.79

 

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