zinc anode supplier

[h2opixels]

Anybody know of zinc anode supplier for the attached (for an Ovni rudder).
Looking at the MGDuff catalogue, I can only see single screw mounting variants.
Thanks, David

 

[Birdseye]

I seem to remember that Ovni anodes arent zinc but magnesium. Hve a word with North Sea Maritime - they used to bring anodes back from France I believe.

 

[h2opixels]

thanks & good point, magnesium is at the top of the galvanic table
I'll email them to clarify

 

[VicS]

thanks & good point, magnesium is at the top of the galvanic table
I'll email them to clarify

But you'd not use magnesium in salt or even brackish water. It is too reactive.

Zinc or aluminium in salt water.

Aluminum in brackish water.

Magnesium in freshwater.

 

[NormanS]

But you'd not use magnesium in salt or even brackish water. It is too reactive.

Zinc or aluminium in salt water.

Aluminum in brackish water.

Magnesium in freshwater.

Not at all sure that an Aluminium anode would help much, on an Ovni.

 

[h2opixels]

From an Ovni manual i've found on-line:

"These anodes are made up of zinc, Those made up of magnesium are to be avoided imperatively.
The cathodic production system by impressed current is to be banned.
If the anodes are not corrupted, you should check the following:
They are not painted,
They are correctly fixed and in contact with shell, They are in zinc"

So they should be zinc ... but I'll double check with Northsea Marine & perhaps they are the only source of these anodes in the UK

 

[h2opixels]

Yep, Alu anode on Alu hull is not much help

 

[VicS]

Not at all sure that an Aluminium anode would help much, on an Ovni.

Yep, Alu anode on Alu hull is not much help

" Aluminium" anodes are are made of a special aluminium-zinc-indium alloy conforming to a US military specification, or similar .
At -1.09 volts (relative to a Ag/AgCl electrode) it is infact slightly more anodic than zinc is at -1.05 volts

Aluminium hulls can be fitted with either zinc or aluminium anodes for saltwater use.

 

[sailorman]

Dunno if this site helps
http://www.solentanodes.co.uk

 

[h2opixels]

FWIW - North Sea Marine confirm it's zinc and a Plastimo anode
Thank you all for your posts

 

[VicS]

FWIW - North Sea Marine confirm it's zinc and a Plastimo anode
Thank you all for your posts

I could not find t at first

Cat No 38327 might be it