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Originally Posted by zer0signal667
If the radiator was the problem, why would the top be corroding? I'm betting it's just galvanic corrosion between the copper base and the aluminum top. With the pieces that close together, even a tiny pinhole in the top's coating would definitely lead to extensive corrosion. The corrosion in areas away from the o-rings was probably also assisted by erosion.
The radiator may also be corroded if it's aluminum, but I doubt it will be nearly as bad as the top. For galvanic corrosion to occur, there needs to be electrical contact between the parts (aside from the water). The case may be providing this, depending on how the block is mounted to the CPU, but then there is the fact that the block and radiator are separated by a substantial distance compared to the block and the top.
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Particles in the water are plenty sufficent to cause the corrosion. But I agree it was probably poor anodizing on the top. Problem with this is the corrosion particles may have entered the rad and started in on it to?