On Aug 7, 12:32 pm, Fortunat1 wrote:
Fortunat1 wrote :

I have access to a plating facility (aviation, but it's a jet engine
rebuild shop) where I can get my wing fittings plated. My
understanding is that 4130 cad plating is just that, cadmium and
nothing else, but this shop does it's cad plating by a coating of
nickel first and then cad plating.. I'm reluctant to do this for the
obvious reasons until I find out what the story is...
Anyone know?

Actually, I was mistaken about the nickel. This is the actual process;

http://www.sermatech.com/documents/s...rmetel1207.pdf

The described process is not plating. It is coating with an organic
polymer, vaguely similar to epoxy paint or powder/melt coating,
the modern replacements for baked enamels.

In general plating reduces the fatigue limit for parts by leaving the
surface in a state of residual tensile stress and if electroplated,
possibly also due to hydrogen embrittlement.

The described process would not appear to present either of those
problems, though it is always best to inquire with the manufacturer
for a specific application.

--

FF