As I understand it, two dissimilar metals in an electrolyte
is a necessary but not sufficient condition for corrosion to
occur. If the chain is electrically connected to the anchor,
but 50 feet away from it, very little of the zinc would be
sacrificed. This is where I was originally going with the 50
feet of nylon.

In the case of a single monel link, I believe you are
entirely correct. The galvanized chain will be sacrificed
almost as readily as without the monel link, even if the
galvanized chain links never touch the stainless steel directly.

Thanks for pointing that out.

Chuck


Garland Gray II wrote:
Would that really help?
I thought that if the two dissimilar metals were electrically connected, you
had a problem. Hanging a zinc guppy overboard will sacrifice the guppy, so
why wouldn't the galvanized chain be sacreificed even if it was seperated,
but electrically connected?
Electrolysis can be a real problem. I had a bridle w/ almost all ss parts:
chain hook, ring, shackles and thimbles. Everything except about 5 links of
galvanized chain between the chain hook and the shackle connecting to the
ring. Those links quickly became rust, so I replaced the ss with galvanized.
Of course, all this was in direct contact with each other, but I suspect
that electrical contact is enough to creat a problem.

"Lew Hodgett" wrote in message
ink.net...

Somebody wrote:



I just found a 90 pound stainless steel plow to use as a mooring
anchor. The guy I got it from said that he thinks there is an
electrolysis issue if you use galvanized chain. He said that there was
something I needed to do, but couldn't remember what.

Anyone have any clues for me?

There is.

Install a monel or equal link between the S/S and the galvanized items.

Lew