I'd like to know what the main differences are between inox screws and silicon bronze screws (in boatbuilding). Vantages and disadvantages. I ask this question, because it's easy to find inox items here in my town, while there is no choice of silicon bronze screws
"pietro" <no@spam.it> wrote in message news:fS%Ud.604877$b5.27635781@news3.tin.it...> "pietro" <no@spam.it> ha scritto nel messaggio>
inox screws>
sorry, I mean: stainless stell>
Stainless steel is only stainless if there is oxygen present. Below the waterline, stainless becomes much like swiss cheese... Called crevice corrosion. Stainless also comes in different grades... the more expensive of which is better resistant to crevice corrosion..and can be used for things like rudder fittings where the water is disturbed/turbulated a lot and thus a little oxvegen gets to the fitting... But i bet the stainless that is available locally is NOT the higher grade stuff.
You spent how long and how much on the boat? The percentage of the total cost in time and materiels that the screws represent? It is seldom worth skimping on the screws...... sorry.
I’d like to repair a quite wrecked wooden boat (I got her as a present); many screws were missed along the keel; the boat is for recreational activities; I’m living in countryside and therefore I’ll have to tow her with my car to the see; I don’t intend to leave her in the water all the time; I’m looking for an arrangement; what about brass screws?
...or : to fasten the lap to the keel, is it possible to use copper nail NOT rivetted but simply nailed into the keel? maybe with a bit of epoxy glue (I mean: drilling the keel and gluing the nail in the hole)? please don’t be shocked, I’m a woodworker (hobbyist), not boatbuilder
On Tue, 01 Mar 2005 14:56:49 GMT, "pietro" <no@spam.it> wrote:
I'd like to know what the main differences are between inox screws and>silicon bronze screws (in boatbuilding). Vantages and disadvantages. I ask>this question, because it's easy to find inox items here in my town, while>there is no choice of silicon bronze screws>
thanks>
Silicon bronze screws won't rust - ever. Their initial strength is lower, usually.
IВ’d like to repair a quite wrecked wooden boat (I got her as a present);> many screws were missed along the keel; the boat is for recreational> activities; IВ’m living in countryside and therefore IВ’ll have to tow her> with my car to the see; I donВ’t intend to leave her in the water all the> time; IВ’m looking for an arrangement; what about brass screws?
Never use brass on a boat.
Brass has zinc and copper in it. These two react in the presence of an electrolyte (e.g., salt water or even moist salty air) turning the zinc into zinc oxide (a structurally weak white powder) with copper around it. Overall this weakens the brass so badly that it will just about fall apart.
Nickel plated zinc is another material that should never be used on a boat, for similar reasons. For some reason, a lot of cheap boats use nickel plated zinc fittings.
