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Originally Posted by Kbofwy
I also think the fear of aluminum in water systems is highly overstated. We have unanodized bare aluminum in our irrigation equipment that have been in use for over 30 years. The only time we ever have corrosion happen is when steel comes in contact with the aluminum for a period of time. Otherwise, there isn't any problems with it at all. I also mill my waterblocks out of 6061 and don't bother to anodize them.
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Aluminium is fine on it's own, the issue arises when dissimilar metals are used for various components in the loop. Since almost all rads are copper/brass, as are most water blocks, you can see that problems with galvanic corrosion can and do crop up.
Although you probably know all of this.
8-ball