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Bad prop

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We bought a brand new boat in March and had this stainless prop added to the new motor. We fish fresh and salt water,after fishing this weekend in Grand Isle my entire prop was covered with some type of corrosion. This picture is after scrubbing for an hour. Does anybody know what may be the cause? We used the boat a month ago in cocodrie and it didnt do this.
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Cavitation may be the culprit..
Do you have a pic of how high the motor is mounted while the boat is running? The water should be even with the cavitation plate as the boat is on plane.

Given the location of the pitting, it looks like cavitation is the culprit.

http://en.wikipedia.org/wiki/Supercavitation

Without knowing more, it's hard to tell.

Captain Devin
985.788.4963
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i agree with SS...
you said the boat was bought new, was the prop a reconditioned prop bought at later date?
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'Louisiana Theoretical Encyclopedia'
...your descpt.might be as bad as mine...some people say 'electrolysis within the electrodes'...I had a bunch of old clowns years ago tell me that if you place your ear on it, 'ya find the darn thing buzzes w/static hydraulics ???...I never could hear anything ???...cheers
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Hard water stain
Looks to be calcium stain from the water. Clean the prop with muriatic acid.
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could be electrolysis
If it is an aluminum boat make sure that nothing is grounded to the boat. All ground wires must be run back to the negative on the battery. If you ground to the boat your boat and in your case prop will corrode away under you. IMO the marks on your prop look to be too random to be cavitation.
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anode?
What is the status of the sacrificial anode?

Captain Devin
985.788.4963
Visit my site
www.swampstallionfishingadventures.com
Read my blog
www.swampstallionfishingadventures.com/wordpress
See me on Facebook
www.facebook.com/swampstallion
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sand
dont overlook the possability of sand combined with cavitation could literally have sand blasted the finish on the prop.

other areas are mostly mud but grand isle has silica sand that is harsher on lower units then any other area
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pool chemicals
Do you keep the boat in a garage with pool chemicals nearby? My father in laws Harley was kept in his shed. Well he got a pool and kept the chlorine in there. It did the EXACT same thing to his chrome on his hog. HE WAS PISSED!!
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sand?
dont know if this helps, but last year i had the boat in gulfshores on vacation. had the same stuff on my prop, it was from sand. i ran across a small sand bar and my prop looked the same. sanded off with 1000 grit sand paper. hope this helps.
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prop
Take it to a good prop shop and they will be able to tell you the source of the problem as well as the solution.
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Prop
The damage was caused by galvanic corrosion. The problem can be solved by the use of an aluminum anode. The best place to install it is right below the mounting bracket. Drill a hole through the bracket near the anode and connect the tab on the anode to the bracket using #2 insulated copper wire, stainless steal bolts and compression lugs. Coat the lugs and any exposed copper with liquid tape. Do not paint the anode! Aluminum anodes oxidize readily and should be polished at least once a year with a fine grit sandpaper. See the following link:
http://www.martyranodes.com/content/martyr-resources/Aluminum%20Anodes.pdf
You may also use a zink anode but I do not recommend it. The probable reason that it occured at Grand Isle is because the salinity level was higher.
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Anode
You may also want to check out this link:
http://www.rotometals.com/Hull-Anodes-Weld-On-Alumiunm-or-Zinc-military-specification-s/3.htm?gclid=CNur44TftLACFUyb7QodDG8iVQ
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