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Originally Posted by Hotseat
The D-Tek Mark I should all have been type III, the blue units with "c-systems" are likely just type II. But since we have had mark I's in a tank for over year, and none show any corrosion (expect the bolts on one batch) , I think it's a dead issue. You should also note we moved to 6063 alloy too enhance resistance.
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Just for additional testing, I would love to see the results of the pumps being run in an actual closed loop distilled water environment, since this is what many of the people using these things will do.
i.e. 5' of tubing, a large copper cored radiator and a copper (or better yet silver) impingement style waterblock. Let those pumps run for 5 different test systems for 6 months straight and inspect the pumps then.
Blocks sitting in a tank doesn't tell me that much.
Forgive me for being cynical. Every single product that has been anodised aluminium with the manufacturer swearing black and blue that it absolutely positively will not suffer from galvanic corrosion, ultimately has ended up with pictures posted in some forum with horrific corrosion, sometimes in a matter of months, sometimes even when corrosion inhibitor is used.
Test for the worst case scenario, which is basically the pumps sitting in a loop with distilled water, and 3 other components in the loop being all copper/silver based, to simulate what customers will see.
I used to swear black and blue that the polycarbonate I used on my waterblock tops would not crack after running extensive physical stress tests. Turned out that all it really took was 20-50 major thermal cycles (varying from 20C to 40C water temps) for some tops to begin failing, something which I admit to not adequately testing (I ran about 20 cycles of 20-30C on a few tops with no failures). Some materials are just a bad idea for certain applications.