|Topic Review (Newest First)|
|03-13-2006 02:56 PM|
Originally Posted by offline2004
|03-10-2006 11:01 AM|
|camaraderie||Matt...more is better...as one of the other posters said, you can also hang a zinc "fish" from a backstay to allow you to monitor the "sacrifice". The electrical problems may NOT be comming from your boat as we have noticed vastly different rates of zinc attrition in different marinas where other boat's and the marina's electrical system may contribute to th problem. Check with other owner's nearby to see if they have the same problem.|
|03-10-2006 10:38 AM|
I unfortunately do not know what the status of the Zinc's were. Unfortunately this is a case where ignorance was not bliss.
With the new prop they machine shop put on a new on set of zincs the prop shaft.
Walking the yard I have noticed that several people have 2 sets on the shaft. Is this a case of more is better or and I simply going to have 2 sets of zincs deteriorate at the same pace as 1 set?
|03-08-2006 10:59 PM|
Originally Posted by offline2004
If your boat lives in a freshwater environment, it is important to note that anodic protection should be provided by magnesium anodes, not zinc. The zinc anodes do not have enough electrical potential to overcome the greater resistance inherent in freshwater.
|03-08-2006 10:24 AM|
Thanks for that PYI, Petit paint URL. I have a MaxProp - its good to see that the paint comes recommended by PYI. I'll give it a try this season.
|03-07-2006 03:29 PM|
Your post didn't comment on the status of your shaft zincs. Those are intended to protect other components like props. If you didn't have any in place, there's your problem. If you did and they eroded away, start using an extra zinc hung into the water off the stern, connected to th engine. There a model shaped like a fish at most stores. If you have this problem with the zincs in place, there probably some poor quality material in the prop or shaft.
To prep the prop, use a zinc prop paint such as: http://www.pyiinc.com/index.php?sect...u=mppaint&sn=2 This stuff has worked Ok for us, keeps growth off the prop, but not much to do about the problem of corrosion.
|03-06-2006 10:46 PM|
Have you found a paint that protects the propeller for a season? Most paint doesn't adhere to the prop blades long enough to provide much protection if the boat is driven under power for any length of time. I've pretty much given up and just clean and polish out of the water once a season. I've tried one or two paints that claim to protect a propeller, but ended up being more advertising hype than benefit.
I'd be interested to hear if you have found better results.
|03-06-2006 09:09 PM|
We noticed pitting on our prop and think it may have been helped by anti-fouling paint that was applied without the proper undercoatings. We've since been more careful about applying priming coats. We still renew the zincs too, though.
|03-06-2006 12:30 PM|
The stray a/c can be difficult to find.
Did the propeller/shaft have anodes when you purchased the boat?
Your propeller installation probably has one (or more) sacrificial zinc anodes. Make sure that you keep an eye on their decay once you have installed the new prop. This may require a dive once a month or so. If the a/c near your dock is suspected to be high - move the boat to anchorage before diving on the prop/shaft. If the decay rate is such that the anode(s) will be less than 40-50 percent before your next scheduled haul, you will have to move the boat, or find the stray current. Talk to the marina operator - they may be helpful.
Propeller replacement is expensive enough that if the decay continues at a rapid pace, you should hire a marine electrical technician to help you find the source, or at least verify that it is not coming from your own equipment.
|03-06-2006 12:12 PM|
Electrolysis/Corrosion on my Prop
I have a 1995 Hunter. When I pulled her this winter I noticed extreme corrosion of my prop. When I purchased the boat in Late 2004 I saw no indication of this on the prop. I am having prop replaced and obviously want to prevent this from happening again. All of my seacock show no signs of electrolysis.
What can I do/should I do to protect my prop and boat. From what I understand this could be coming from my boat or one near by me in the marina?
Are there things that I need to check and are there steps I can take to protect this?