I went back and took another look at the specs for the housing of the GTX.

1) There's a 5 year limited warranty, the limitations are: mechanical damage(s), die discoloration.

2) The plating is two layer zinc-cobalt and nickel, presumably the zinc-cobalt is the layer closest to the Alu because they would want the shiny nickel on the outside.

There's a code number for the zinc-cobalt plating but I didn't have much success getting any info on it. Perhaps someone with more time might do better.

There are patents for highly sophisticated, galvanic corrosion platings of this dual layer type (strictly triple layer platings as I understand it as there is also a raw zinc layer) with these metals, so it's possible, even likely that Swiftech have gone that way. Under ideal conditions zinc plating would protect Alu even if scratched or damaged, I'm not entirely sure if the zinc-cobalt + nickel would perform as well, but zinc-plating of Alu is a very well established technique and has worked for the auto industry, construction, piping and electronic devices in the past.

It's not risk of corrosion that would put me off this product, but the fact it offers no obvious benefit over the FuZion I have on order