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Minsc

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Reply with quote  #21 
When I see your storage tank I think "deep freeze".

Great looking project.

Rick H Parker

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Reply with quote  #22 

In the 70s a lot of companies made copper-aluminum solar collectors, within 25 years they where all in the scrap pile due to Galvanic corrosion (AKA: Bimetallic corrosion and Dissimilar metal corrosion) .

With copper pipes you would not get galvanic corrosion against copper, brass, nickel or stainless steel.
With aluminum pipes you would not get galvanic corrosion against aluminum or cadmium.

 
 
Rick H Parker



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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
ChrisJ

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Reply with quote  #23 
"When I see your storage tank I think "deep freeze"."

My wife see's coffin...

Rich, I think the 2 coats of aluminum primer and 5 tubes of silicone should slow down the corrosion.
Rick H Parker

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Reply with quote  #24 

If nothing leaches from the primer that can form an electrolyte, the primer and silicone ensures there is no electrolyte bridges the copper and aluminum, well into the future ... you might avoid galvanic corrosion. The electrolyte usually is in the form of naturally occurring salts dissolved in water.  Your aware of the risk, its your project, your wallet.


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Rick H Parker
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stmbtwle

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Reply with quote  #25 
"MIGHT". And then there's Murphy.
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Willie, Tampa Bay
ChrisJ

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Reply with quote  #26 
That pesky Murphy..
stmbtwle

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Reply with quote  #27 
Actually, corrosion between the fins and the tubing should be minimal as long as there are no leaks.  The inside of the collector SHOULD be dry, and as long as the water stays inside the copper pipes where it belongs it will never contact the aluminum.
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Rick H Parker

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Reply with quote  #28 
"Actually, corrosion between the fins and the tubing should be minimal as long as there are no leaks."

Condensation is the source of the water that forms an electrolyte not leaks. 

Rick H Parker

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #29 
Can't argue with that, especially in the cold country.
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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #30 
Two dissimilar metals or metal oxides, electrolyte for a chemical exchange pathway, electrically conductive pathway, are the three basic components of a corrosion battery.

Rick H Parker

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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