By that logic alpha, swiftech, and many other heatsinks would also just spontaneously corrode in air? I am familiar with galvanic corrosion in marine environments, but I have to admit I am not at all familiar with such corrosion in air. My instincts would be that it is usually only a problem with metals that sit out in the rain, and that it would take many years. I am sure you are also aware that the rate of galvanic corrosion depends upon the difference in potential between metals. Do airplanes use a lot of copper? Aluminum I could see, but copper no. I think you may be being a bit liberal with the facts...
I am assuming you are talking about the DTek shroud? The one that I got from them wasn't made of aluminum, and it had some weatherstripping on it to isolate it from the heatercore itself. I found it to be of very high quality, with no gaps at all. It is also a good bit cheaper than $25.
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