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Originally Posted by EnJoY
Yea, but with copper or worse yet, silver blocks, in your loop...those metals will attack whatever aluminum is exposed and cause it to corrode. Normally, anodizing would prevent such a thing, but because of the fast movement of water in a loop..especially in the pump, this anodizing wears off slowly and eventually exposes the aluminum. There is no avoiding this and even the best anodized aluminum (swiftech blocks) have overtime been reported to corrode. Again, I realize it's only one bearing case that you say is exposed to water...but if that corrodes then what? Will the pump malfunctions? Will flow be hindered? Worse yet, will it cease operation?
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Your fears are somewhat exaggerated. I have had sevarl blocks that utilized aluminum and never had a problem with any kind of corrosion. Use of proper inhibitors prevent any galvanic reactions.
Besides, if the entire pump is made of plastic and other relatively inert materials, why worry? It is almost like you are attacking the thing because an older model had a problem... and the problem with the older model wasnt corrosion in the first place.
The probelm with corrosion in watercooling has largely been solved, so any future cases of corrosion should be mostly attributed to either user error or ignorance, not necessarily manufacurers.