Aluminum anodes on aluminum outdrive-question

jgresham75

Seaman
Joined
Aug 19, 2008
Messages
70
I have 99 Volvo Penta SX outdrive. I am replacing my anodes. I use mostly in salt, sometimes brackish water. Current anodes are zinc. Been reading up and found aluminum seems to be the better choice due to its properties. My question is how does the 'aluminum' anode work when it is attached to an 'aluminum' outdrive?

This seems couter productibe since the drive and anodes are the same chemical makeup. Thanks for your input.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Aluminum anodes on aluminum outdrive-question

My question is how does the 'aluminum' anode work when it is attached to an 'aluminum' outdrive?

Completely different aluminum alloy.
 

tayznild

Seaman
Joined
Mar 30, 2011
Messages
54
Re: Aluminum anodes on aluminum outdrive-question

I heard there are magnesium anodes to...
 
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