Protecting Your Ship From Galvanic Corrosion: Drydocking NJ
In this episode of our drydock series, we’re talking about the anodes that are used to protect the ship from galvanic corrosion.
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"electricity flows through the water it's going to start to remove molecules from the metals" I think the idea is that depending on the direction of flow of electric current molecules get removed from one piece of metal and deposited on another piece of metal, you just set up the electricity so molecules are not removed from the ship, make the ship the destination for molecules removed from those big chunks of cast iron laying on the bottom
hi ryan interesting tohear the zinc is bolted on most british canal boats are steel and the zinc ia welded on durimg blacking in dry dock i dont know of the relative merits one of the episodes of cruising the cut covers th subject i look for the link for you
Once worked at a company that made torpedoes. We did test once about corrosion. We observed that you get the most corrosion at the saltwater air interface.
I once worked at a company that made and sold the anodes. I wonder if any of the anodes are from the company.
Ifvyoure in a marina on a still night, and there is a poorly maintained boat, you may actually hear a fizz.
If your moored boat is chomping through anodes, your neighbor appreciates the protection?
Thanks so much for this seriesRyan. This series has been lifesaving for restoring on my own Iowa-class battleship in my backyard.
Isn't it a conflict of interests to have a company called anode solutions involved with you cathodic protection system? I'm sorry for that joke.. I'll leave now .
Sponsor a zinc!!!
I bet if you turned off your active cathodic protection, you'd have enough electrical juice to rotate a turret…
Will you be selling the zinc anodes?
Other than confusing reactivity with purity it was a good explanation of corrosion
In1998 the active galvanic corrosion system on the Missouri malfunctioned and the entire museum staff and 67 visitors were electrocuted. It was the highest death toll ever recorded on a museum ship.
So your telling me I can park my tesla in the river and charge it for free?
How much monel is used on board?
I remember reading a report of an active CP project where they got the voltage polarity the wrong way round.
Ensuring that galvanic corrosion protection both passive and active is working and in place should be a high priority. You think $10m is a lot now, wait until you have to replace part of the hull like USS Texas is doing / did if you don't have your galvanic corrosion protection working to protect theship..
Don’t you think the impressed current active protection system might be the main reason the zincs are in such good shape rather than that they are “not working“?
Hey, about donating… I tried that, but credit card seems to be the only available payment method. Could you perhaps add paypal or something similar, so people outside the US can contribute as well?
My grandfather served on New Jersey during Korea, I would love to get some pieces of her to add to our little "shrine" to my grandfather in addition to his flag and a model of the ship.
You can think of the active cathodic protection as trying to electroplate the ship (the parts to be protected) but with not quite enough voltage to actually deposit any new metal.
The system you described seemed to use separate anodes (not part of the ship, sitting nearby in the water), but in the comments here others are describing systems where the anodes are part of the ship, either (like the passive anodes) designed to corrode, or (like, say, bronze parts) naturally resistant to corrosion. The former would use shore power when docked, while the latter would use on-ship power while at sea.
Replacing the passive anodes seems like the least time-consuming of your three major drydock tasks and probably requires the least skill, at least until one of those studs shears off. If one anode is done wrong it is no big deal, but if you mess up sealing even one through-hull fitting, you've got a problem!
You can recycle all that zinc to make a good amount of money back.
Why not switch out the zincs with Magnesium anodes which work better in fresh water. I’m just saying it’s very rare for the salt water front to get to Camden.
Seems you can replace only half or fewer of the static zinc anodes with a mix of manganese and aluminum and leave the other zincs in place. The zincs are corroding, so they are helping, but the active system is doing most of it anyway. Save money and labor and time and just replace half of the zincs. Use mostly aluminum and a few manganese. That way you are protected on multiple reaction fronts. The static anodes are only a backup to the active system, so they don't need full strength anyway. But they can be there when the power goes out and take over for those short periods. They should last many times longer (as long as the ship?) with the active system doing the majority of the work the majority of the time.
You not only need a ton of support, but over 12 tons for all the anodes.
I think either way the anodes you remove get sold off, either for souvenirs or for recycling.
Excellent update. It's amazing to see the scale of the protection systems. FYI, it not 'more pure' 'less pure' metals that governs which metal gets consumed, the property is called 'metal reactivity' – the more reactive metal of the pair, gets consumed.
That's why you should paint the propellers while in dry dock.
This reminds me of. James Clark Maxwell…