Originally Posted by FISHTIGUA
I'm getting a bit p*ssed at manufacturers sending out products with aluminium anodes on, thinking that they will cover most conditions.
I had an owner in yesterday who bought a new Volvo engine and drive. Within 4 months the drive had pitted and the paint was falling off. He's spent months argueing about warranty and it's spoilt his enjoyment of the boat. All new Volvo outdrives now come with aluminium anodes as standard and are crap protection anywhere near saltwater. Change them now, no matter how 'good' they look.
Sidepower bow and stern thrusters are no longer sold with zincs, aluminium is all you can now buy for protection (unless a member knows of an alternative?). Mercruiser has sold aluminium anodes for years and have a less than glowing reputation for corrosion inhibition.
Not a very 'noble' state of affairs. (Sorry for the metallurgic pun) Attachment 47158
FISH – I well understand your piss-off at what occurs to boat owners who are basically “forced” by manufacturers to use aluminum anodes. My concern goes with yours for the eventual corrosion trouble leading to replacement costs to those owners.
That said; Have you input to my base question (see my in-depth post at top of this link): What is the efficiency differential for galvanic protection of zinc versus magnesium anodes on an inboard through hull drive boat while it stays exclusively in fresh water?