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Old 26-11-2011, 10:58   #46
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Re: Stainless Steel Yacht ?

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Originally Posted by Ctrich View Post
a short list of pro's and con's.?
I had dinner on a SS yacht a few years ago. It was a large Ketch
The yacht had replaced all the deck because of corrosion under the teak, but from what I understood (there was some language difficulty) this was not due to crevice corrosion, but caused because the deck was mild steel and only the hull was SS.
The only other thing I remember was that he said it was nightmare getting antifouling paint to stay on.
Unfortunately I have not seen the Yacht for several years and they did not have email.
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Old 26-11-2011, 11:15   #47
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Re: World's biggest cathode...

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Originally Posted by Boracay View Post
and some would need to be painted.
Painting SS is not an option. It will not stick. Paint trucks for road striping use all SS parts just for that reason!!!! The same with monel.
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Old 26-11-2011, 11:26   #48
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Re: World's biggest cathode...

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Originally Posted by delmarrey View Post
Painting SS is not an option. It will not stick. . . .!!!! The same with monel.
Geeze, why the yelling. Our friends with SS boats all have epoxy barrier coats with anti-fouling over on the hull bottoms (And also all have boot stripes painted on and deck paint), and we ourselves painted a stainless centerboard trunk we had custom made in NZ (for our old boat). If you do it carefully it works just fine, like with aluminum.

Interlux's instruction for painting stainless:

http://www.yachtpaint.com/Literature...ar_usa_eng.pdf

Jotun primer recommended for stainless:

http://www.jotun.com/jotun/paints/20...26.11.2010.pdf
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Old 26-11-2011, 12:06   #49
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Re: Stainless Steel Yacht ?

OK, I toned it down a bit. But I can guarantee that if it gets a good smack or scratch, that the spot will start a peeling process.

The reason SS was made in the first place was as a STAINLESS steel, which means nothing will stick to it. It's the teflon of steels.

It's surface would have to be abraded like micro stones so that paints and other coating have something to grab. Rubber would make a better bonding agent because it would be able to take a hit w/o delaminating. But a scrape would still pull it off.

If you notice in the painting instructions it has to be blasted and treated with a dry solvent to a perfectly clean surface and then painted w/in a couple hours. It would have to be sprayed on in order to get it all on in that time.

The chromium in the steel combines with oxygen in the atmosphere to form a thin, invisible layer of chrome-containing oxide, called the passive film. The sizes of chromium atoms and their oxides are similar, so they pack neatly together on the surface of the metal, forming a stable layer only a few atoms thick. If the metal is cut or scratched and the passive film is disrupted, more oxide will quickly form and recover the exposed surface, protecting it from oxidative corrosion.

If I were to build a boat of SS I would use an A-20 material for the bottom and not worry about the paint. >>> Alloy 20 Stainless Steel | A20 Stainless Steel - Warren Alloy
This is what we use in the valve industry for chemical valves, which commonly have to be oxygen washed for the same reason (sanitary).

BTW- The passive film requires oxygen to self-repair, so stainless steels have poor corrosion resistance in low-oxygen and poor circulation environments. In seawater, chlorides from the salt will attack and destroy the passive film more quickly than it can be repaired in a low oxygen environment.
SS needs to breathe!
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Old 26-11-2011, 13:41   #50
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Re: Stainless Steel Yacht ?

Just build your boat out of epoxy, matt and cloth. Squeejee out the bubbles, do not rolled them out. Over the gel coat in the mold apply a coat of black resin to block U-V's. Install at least 3/4" closed cell fexible foam insulation between inner and outer hull....Now you will have a boat that will survive reefs and last several hundred years worry free...!
I self designed and built my 50' 23 ton Daedalus from an assortment of polyestyer and epoxy resins and launched her 35 years ago. She is USCG certified, sailed almost daily and will last indefinately into the future. One problem was the the top fiberglass over the saturated balsa insulation on the forward deck was replaced after 25 years. No big deal! Also, this big boat is run up on steep-to undeveloped beaches every day for the passengers to comfortably climb down to explore or swim. I sold her 10 years ago.
Capt.Fred Saas...see my album...
I understand bullet proof vests are made out of epoxies and so is the armament on Israeli tanks
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