Originally Posted by Blue Stocking
Greg, can you give us some of the specifics about the best fastenings to use with titanium chainplates.
Do they need to be insulated from Ti, how about elec bonding for lightning
Reaction with chemicals in caulking, sealers?
Blue, I would recommend titanium fasteners with titanium chainplates. The issue is that because titanium is the most noble of the structual metals, a bolt made from anything else may be subject to galvanic attack. Frankly when you compare our prices to many chandleries price
for stainless there isn't much of a price
At least for the forseable future titanium will be more than stainless, but not nearly as much more as many think. For instance our lifeline stantions are $62. Lewmar
wants $99 for theirs, and Gurhauer wants $35. So the price difference is close enough that premium stainless parts
may actually be more than titanium... Weird world.
As for corrosion, or attack by chemicals:
There are only a very small number of things that attack titanium. Generally none of them are present in the marine
world. While I am not a chemist, I have looked into this a good bit. Strong concentrations of sulphuric acid can attack titanium, but we are talking orders of magnitude stronger concentrations than battery
acid. Chemically pure dry chlorine gass (but not wet) can attack it
Frankly titanium in the normal marine environment
is just immune to corrosion. The only place on a boat where it suffers from corrosion is when used in wet exhausts, where the tempratures exceed 215 degrees F. But even there it is still orders of magnitude better than any other option.
Just a few examples of where the corrosion resistance of titanium is currently in widespread use...
100,000 year rating against corrosion for nuclear waste storage
Lifetime warranty on chlorine pool hear exchangers
Lifetime warranty on high concentration desalination plants parts
One of the more common uses of titanium is in an environment significantly more harsh than the marine world. When it is used as surgical implants (screws, legs, ect). Where the parts are always close to 100F, wet, live in a salty brine, and never get exposed to air or free oxygen. And titanium implants still outlive even the best marine stainless on a boat.