Join Date: Mar 2006
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Ummm... you're a bit confused... Stainless steel generally doesn't corrode under paint, since paint bonds so closely to the stainless steel and prevents any corrosion, which requires oxygen exposure, from occurring.
While stainless steel does have issues with crevice corrosion, it doesn't suffer crevice corrosion if properly painted. IIRC, for stainless steel to corrode it has to be deprived of sufficient oxygen to prevent the passivation action of the chromium in the steel alloy from protecting it, but exposed to enough oxygen to convert the iron into iron oxide.
Painting prevent any oxygen from getting to it, not a limited amount...which would be a problem.
Originally Posted by SiXeVeN
Another thread got me thinking. I have some stainless steel hardware that has recently been "heavily scratched/etched"
I have thought of having the hardware primed and painted with a 2 part polyurethane marine paint but i'm concerned about crevice corrosion issues as stainless steel needs oxygen exposure to chemically prevent itself from corrosion.
I have two thoughts... 1) The stainless steel will be painted preventing any exposure and thus corrosion as it will be protected from moisture and salt by the paint.
2) The paint will block the necessary oxygen exposure and the stainless will begin to corrode under the paint... leading to failure.
Anyone have any thoughts or successfully painted marine stainless steel without issues???
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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