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Author Topic:   Sacrificial Anodes For Protection From Galvanic Corrosion
howlingdogsteve posted 03-20-2008 07:37 AM ET (US)   Profile for howlingdogsteve   Send Email to howlingdogsteve  
I need advice.
Looked over the archives but still don't know what to use.
We have a 2004 Montauk that needs "zinc" replaced.
Boat goes in salt water canal April and comes out October.
Which would be better for this application:
zinc or aluminum anodes?


K Albus posted 03-20-2008 01:04 PM ET (US)     Profile for K Albus  Send Email to K Albus     
West Marine recommends aluminum for salt water because they provide the same protection but cost less. See: -1/10001/GalvanicCorrisonProtection.htm
K Albus posted 03-20-2008 01:05 PM ET (US)     Profile for K Albus  Send Email to K Albus     
My mistake . . . West Marine says that the aluminum anodes last longer (than zinc) but provide the same protection. West Marine does not state that the aluminum anodes are cheaper than the zinc anodes.
deepwater posted 03-22-2008 11:22 PM ET (US)     Profile for deepwater  Send Email to deepwater     
Strange they suggest using alum anodes to protect alum out board motors,, are you sure it's not for bigger boats and almost all steel motors that could use the alum ??
boatdryver posted 03-23-2008 09:06 AM ET (US)     Profile for boatdryver  Send Email to boatdryver     
Assuming there are no anodes on your fiberglass hull, It seems strange to use an aluminum sacrificial anode on an aluminum outboard motor. I'd try to get some clarification of what West Marine really means. I thought the idea of a sacrificial anode is to use a metal that the salt water or electrolysis will attack more easily than whatever you are protecting.

Anyway on a trailerable boat it is so easy to change anodes I wouldn't worry about how long zinc lasts.


contender posted 03-23-2008 09:41 PM ET (US)     Profile for contender  Send Email to contender     
Go to your dealer/engine type and get the right ones...good luck

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