slow anode corrosion

vasant

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Hi all,
On my volvo saildrive i replaced the anode last year as usually. Every year it was more or less decently eroded.
Now after haul out this year i saw the anode is almost like new. Almost no corrosion.
Nothing really changed since last year, boat same , marina same etc.

The ONLY think i made different this year was to use thread locker on the screws of the anode, not sure if this realy can make a difference......
 

RichardS

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Did you paint the saildrive with a different antifoul paint?

Thread locker will not cause a problem as there are plenty of contact points. However, you can check continuity with a multimeter just to reassure yourself.

Richard
 

vasant

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Thanks
I used same antifoul. Velox.
Not sure the anode vendor was probably different
What resistance should be measured? I guess smth close to zero
 

neil_s

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That happened to me with the anode on my rudder blade. I thought 'Great! don't need to do that'. Three years later there is a big, deep, corroded patch on my rudder.
 

vasant

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i only can think the metal wasnt good. Although that shouldnt happen either.
Will try again an aluminium anode as the year before and see what happens.
 

Neeves

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On another thread, and I don't recall which (but one prop AF) - i think it wa reported that application of Velox did appear to reduce anode consumption

We had a similar experience to the OP, to which I panicked, but no sign of disappearing sail drives, yet - and it might be the Velox, and I am monitoring both, or all.

Jonathan

Jonathan
 
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