Quote:
Originally posted by Since87
That doesn't look like copper to me.
The color looks to me like a plating I've heard called "chromate plating" which is used to put a non oxidizing coating on aluminum to facilitate electrical contact to the aluminum. (I don't have any reason to think this actually is chromate plating - just noting the similarity of the color.)
Normal tin/lead solder bonds easily to nickel. I don't have a good guess why the interior of the IHS has that yellow color.
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it has been my understanding (and that of many others) that the IHS consists of solid copper, but gets its silver color from a plating, most likely nickel, probably to resist corrosion or oxidation.