Hi Joyce - the underplating is typically nickel.
Dave Hillman
Collins Aerospace
On Thu, Aug 27, 2020 at 10:20 AM Yuan-chia Joyce Koo <[log in to unmask]>
wrote:
> Gurus,
> what is the std plating surface finishing of ferrous metal
> components leads? Cu or Ni underlying layer (thickness X-micron)
> with solderable surface for lead free? (98% Tin for example, assume
> flash gold is too expansive - >2000 per oz, shish). Anything in the
> field that is new? Is standard change from MIL to ASTM for the
> plating? Many thanks.
> regards,
> jk
>