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Old 12-30-2014, 11:16 AM   #1
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Corrosion?

This picture is from a boat on the hard in my marina. I pass by it on the way to my boat and have noticed that the props almost look rusted.
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Old 12-30-2014, 11:25 AM   #2
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That looks more like calcereous build up rather than corrosion as the "bumps" stand proud of the surface.

Most propellers are "manganese bronze" which is misleading as mb is actually a brass due to it's high zinc content. Manganese bronzes typically show corrosion with pits and a pinkish hue due to dezincification.

PS. The jam nut in your photo is in the wrong place, it should be against the prop hub.
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Old 12-30-2014, 11:56 AM   #3
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Boatpoker stated it very well as to the metals and the jam nut. What he missed is that it seems to be missing a rudder.
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Old 12-30-2014, 12:36 PM   #4
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Quote:
Originally Posted by ulysses View Post
Boatpoker stated it very well as to the metals and the jam nut. What he missed is that it seems to be missing a rudder.
Betcha there's one there somewhere
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Old 12-30-2014, 12:59 PM   #5
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When zincs are working, the prop becomes the cathode and is actually "electroplated" with whatever minerals are in the seawater. Makes a skin of whatever, but metal below is still ok. Color of coating depends on what is in the water.

I try to scrape the skin off my prop when I dive on it, it is a yellowish white here and tough as nails. PITA.

That pitting in the pic might have happened while on the hill.
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Old 01-01-2015, 07:57 AM   #6
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Its new props time when they turn PINK.
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Old 01-01-2015, 12:21 PM   #7
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Yeah but it's not pink. Just covered in mineral build up that happens to be reddish colored.
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