Aluminum anodes on aluminum outdrive-question

[jgresham75]

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]

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]

Re: Aluminum anodes on aluminum outdrive-question

I heard there are magnesium anodes to...

 

[allingeneral]

Re: Aluminum anodes on aluminum outdrive-question

I heard there are magnesium anodes to...

As I understand it, magnesium anodes are for freshwater use only.