On Wed, 29 Apr 2009 22:16:38 -0500, Brian Whatcott
wrote:

Can I guess that you are relying on zincs near the prop shaft?
That would be the ONLY reason the pitting was not severe.

Brian W

Of course there are zincs on the shaft - there is a bronze propeller
on the shaft too. But I have a stainless rudder post and a stainless
wind vane steerer shaft that do not have incompatible metals attached
and don't have zincs which don't have corrosion either.

But quit quibbling. I posted something about monel screws, there are
plenty of sources for them and whether you "need" them or not is of
course your decision.



Bruce in Bangkok wrote:
On Wed, 29 Apr 2009 11:57:55 -0500, Brian Whatcott
wrote:

Show me the stainless alloy that does not corrode when submerged for
long in salt water, and I'm your man.

BrianW

Actually quite a few. Even 304 does not corrode rapidly and I have a
316 propeller shaft that I installed 10 years ago and still exhibits
no corrosion.

What, exactly are you planning on using these fasteners for? Certainly
sufficient 3xx stainless is being used in the marine industry today
that you should have confidence that this alloy will resist corrosion
for a reasonable length of time.


Steve Lusardi wrote:
Brian,
Please do the research if you disagree. Stainless fasteners exhibit far
greater strength and fatigue resistance, which by the way is poor for the
whole nickel alloy family and depending on the alloy, exhibit every bit as
good resistance to corrosion. May I also point out that nickel alloys
fasteners are not always the best solution for corrosive and electrolytic
environments and that includes monel. So, assuming your application
qualifies for a nickel alloy solution, why in the world would you choose
monel, when SS is better and less expensive?
Steve

"Brian Whatcott" wrote in message
...
Strong AND corrosion-resistant!
I'm all ears! Bronze? Particular brasses? Not stainless nor alloy steel
nor mild steel certainly. Some aluminum alloys? possibly.
nickel alloys (other than monel??) Titanium??

Brian W

Steve Lusardi wrote:
Ezcellent? I don't think so. There are other materials far better for
both strength and corrosion resistance. There are reasons why they are
hard to find.
Steve
Cheers,

Bruce in Bangkok
(bruceinbangkokatgmaildotcom)