Jim,

I was also under the impression that the Anodic voltage difference between
two metals should be kept below .15 V in harsh environments. Bronze has an
Anodic voltate of 0.25 to 0.33 (average 0.29) and 300 grade stainless has a
range of 0.0 to 0.15 (average 0.075). This gives a difference of about
0.22V, which is outside of what I thought was acceptable.

-- Geoff

"Jim Woodward" jameslwoodward at attbi dot com wrote in
:

Actually, Geoff, it used to be that good turnbuckles were made with
stainless screws and bronze bodies (or vice versa). The reason is
that stainless galls badly against itself (as many of us know,
although we may not know the word for it other than, "!#$%&*?!" .)
Stainless against bronze runs freely and happily and is a much better
quality device. Unfortunately, they cost more and looked strange, and
are now, I think, gone from the market.

Galvanic doesn't become a real issue unless the two pieces are
immersed. Above deck, there may be a little salt around, but it mostly
gets washed off by the rain, I suspect.