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It's what's known as a sacrificial anode and that is it's purpose.
To explain let's look at batteries and morespecificallyelectroplating:
Two types of metals with differing electron weights when immersed in an electrolyte produce an electrical circuit, where displaced electrons 'Flow' from one metal to the other. This is the principle of the leclanche cell and the modern battery. When the electrons flow, they take the molecules on the anode of one metal and plate the cathode of the other metal. This is why a battery dies after a while. If we do this on purpose we call it electroplating.
With that in mind, now consider a ship.
It's made primarily of steel (The cathode). If the paint flakes the steel becomes in direct contact with the salt water of the sea (Theelectrolyte) and most ships propellers are made of Bronze (The anode). This makes a ship a huge battery and just like a battery the bronze propeller would get eaten away by electrolysis.
To prevent this a "Sacrificial anode" made of a morereactivemetal (further away in the periodic scale than bronze) than the one it is protecting is bolted to the ships hull. It is that which is eroded away by electrolysis rather than the very expensive bronze propeller. Zinc is cheap, bronze is not.
What else can I help you with?
What types of anode?
the two types of anode is stationary anode and rotating anode
Which electrode in the anode is galvanic cell?
Zinc is the anode.
What kind of sign does anode has?
An anode is positive, Cathode is negative. As such, an anode would usually be denoted as + If that is what you meant.
Why anode and cathode rays do not get neutralized?
There is no such thing as anode rays!!
Is the anode positive in a battery?
Yes, the anode is positive in a battery.
Is the anode positive or negative in electrolysis?
In electrolysis, the anode is positive.
Does oxidation occur at the anode?
Yes, oxidation occurs at the anode.
Name of one electrode and say is positive or negative?
The Cathode is the negative electrode; the anode is the positive electrode
Difference between rotating anode x ray tube and stationary x ray tube?
A rotating anode promotes cooling between exposures by distributing the intense beam from the cathode over the surface of the anode. A rotating anode tube lasts a lot longer than a stationary x-ray tube.
What is common anode?
A Common Anode Means A Negative Terminal Of The Battery.
Is the anode red or black in a battery?
The anode is typically black in a battery.
The anode in an electrochemical cell has this charge?
The Anode in electrochemical cell has negative charge (-ve).
