Aluminium Anodes s/s props

[Margem]

My magnesium anodes get eatan pretty quickly, is Aluminium tway to go? Brackish/ fresh water mooring.
Thanks in antcipation

 

[Kipper]

Aluminium are supposed to work better in fresh water. Do you have a mercathode thing on as i find that helps mine last longer. I have a mix of fresh and salt water so have to stick with Magnesium for the drives ans stainless props.

 

[capnjack]

I would have thought that you would rather go through a few Magnesium anodes than put on an Ali and have other metals on your boat corrode?

By the way, mercathodes don't require other anodes apart from a trim tab anode.

 

[duncan]

[ QUOTE ]
I would have thought that you would rather go through a few Magnesium anodes than put on an Ali and have other metals on your boat corrode?

By the way, mercathodes don't require other anodes apart from a trim tab anode.

[/ QUOTE ]

Agree the principle behind your first observation but your second is a cause for concern! Standard recomendation for a BIII drive is 2 x mercathodes per drive and they have 6 further anodes per drive (and no trim tab at all).

 

[capnjack]

Yes, I tend to forget there are larger versions of the Alpha drives for bigger boats. I seem to think that the realms of sterndrives are for the likes of my little boat only.

 

[duncan]

Alpha drive are made of a different alloy and don't generally have the same level of problems! They also come out the box with alloy props which again helps.

and of course they have a trim tab anode to make up for the lack of a second prop /forums/images/graemlins/cool.gif they do however have other anodes installed to rams etc...........even if not the 6 currently installed to BIIIs