JohnW
pfm member
If the Detox PCB is gold plated then contact problem is no issue, correct?
Gold is the least reactive finish as such I'd prefer Gold plating - but the final decision is left to cost and vendors capabilities in China.
The Chassis parts need to be plated with a conductive layer close on the Anodic index to prevent corrosion in humid environment. With Gold plated boards we are looking into nickel-copper alloys on the chassis interface areas, if its not possible then just bare Aluminium with Tin plated PCBs.
Without an electrolyte, Galvanic corrosion is not such a major concern - but its something to be aware off (and could be a concern in high humidity environments if consideration is not made to the Anodic index potential difference).
As I said earlier, being a designer you really need to have a very broad knowledge base... its hard work!