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Originally Posted by Cathar
What you will see when I finally start selling the G5's is an EXTREMELY strong recommendation from me to avoid any use of aluminium in your loop. Don't even bother trying to control it with corrosion inhibitors. You probably can control it with enough effort, but it's just asking for trouble, and you will probably need to replace the inhibitors fairly regularly, such as every 3-6 months. The silver will eat the aluminium very rapidly, and if the aluminium is anodised, then its anodisation better be perfect, or it will find any weakspot and start eating it even more aggressively than copper does.
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My opinion is only really makes any difference if the metals are physically touching - dont know why.. but all of my stuff is fine.. Never used corrosion inhibiters, only d/I water + a biocide.
My d4 pump impeller is perfect - apart from the chip of the annodising that was there when it was new..... and I would assume that impellers would be the first thing to go.. if theres no contact of course..
If you have a lot of wetted bare non-annodised aluminuim then maybe avoid.. but I would say annodied is fine.. still wouldnt use it for a block's top and never touching copper/silver though...
Also some alloys of aluminuim (its rarely pure for many resons) have copper and a few others in them.. I wonder if that will eat itself.. jut and interesting not-related thought..
edit: why bother using a silver block if youve only got an alu rad? I think youd get better performance using the same block but both it and the rad in copper, and cheaper aswell?