Brown Slime On Main Anode

[Alanprib]

I have just lifted my yacht to re-antifoul and a brown slime on the main anode.

Does anybody know has caused this brown slime on my main anode.

There is some erosion on the other anodes especially the closest anode to the propeller but no slime.

Any information would be appreciated.

 

[Tranona]

Suspect the anode is not connected to anything. Follow the wires inside. With an effective shaft anode as you seem to have you probably don't need the hull anode anyway. Anodes nearest the thing they are protecting - propeller in this case will always wear first. Suggest you move the shaft anode aft to about 2cm in front of the P bracket. The closer it is to the prop the better.

 

[Alanprib]

Suspect the anode is not connected to anything. Follow the wires inside. With an effective shaft anode as you seem to have you probably don't need the hull anode anyway. Anodes nearest the thing they are protecting - propeller in this case will always wear first. Suggest you move the shaft anode aft to about 2cm in front of the P bracket. The closer it is to the prop the better.

There another anode where have suggested but is about 20mm wide and has been eroded. I have two anodes on the shaft. I will fit a new anodes before launching. The current anodes have been in the water for 18 months.

 

[Tranona]

Looks like one normal sized anode might do a year which is quite normal. There is probably nothing else that heeds an anode other than the prop so the hull anode could be removed.

 

[alahol2]

A continuity test between the slimy anode and the prop shaft will indicate if the anode is likely to do anything. If you've got fairly good, low resistance, connectivity between the two then it would work to protect prop and shaft. If no or high resistance connectivity and no other metalwork to protect than you may as well get rid of it.

 

[Alanprib]

I have just lifted my yacht to re-antifoul and a brown slime on the main anode.

Does anybody know has caused this brown slime on my main anode.

There is some erosion on the other anodes especially the closest anode to the propeller but no slime.

Any information would be appreciated.View attachment 148623

View attachment 148623

A close up of the slime on the anode.