sacrificial anode


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sacrificial anode

[¦sak·rə‚fish·əl ′an‚ōd]
(physical chemistry)
A protective coating applied to a metal surface to act as an anode and be consumed in an electrochemical reaction, thereby preventing electrolytic corrosion of the metal.

sacrificial anode

A metal plate used in cathodic protection (i.e., the protection from corrosion) of piping or other equipment to which it is electrically connected. This metal plate must be more corrodible than the piping to which it is attached.
References in periodicals archive ?
As early as 1978, Pookote [10] pointed out that AC could lead to the potential shift of Mg sacrificial anode and accelerate its dissolution.
Traditional, tank-style water heaters are installed with at least one sacrificial anode rod, whose sole purpose, as the name implies, is to attract corrosive elements in the water and prevent the tank's steel lining from deteriorating.
She said: "A sacrificial anode is a piece of metal which is put on the side of a boat, usually a big boat, and it gathers all the corrosion and the rust to it, so that the boat survives for longer.
This indicates that the sacrificial anode corroded instead of Sn and Pb.
Solutions to these problems include flexible condenser tubes, suspended condenser tubes that vibrate during normal operation, wide water spray nozzles, condenser tube coatings, sacrificial anodes, and sump water purging.
To combat this, manufacturers equip the water heaters with a sacrificial anode rod.
Working for EnCana, Shaw & Shaw will provide concrete weight coating, sacrificial anode installation and associated logistics for this 175km, 22" diameter pipeline.
The sacrificial anode, as the name implies, is put in place to be lost.
If a tank has magnesium sacrificial anodes and those anodes have decomposed, only then would the tank become the sacrificial anode and corrode before the copper penny.
Attempts to apply sacrificial anode CP to bridge structures have met with limited success, because conventional sacrificial anode alloys operate at a low fixed potential, and the conductivity of concrete often does not permit satisfactory current output.
In the chemistry of corrosion, the zinc becomes the sacrificial anode, and the cylinder metal(s) the protected cathode.
Often the metal is protected against corrosion by the use of a sacrificial anode, impressed current, or a combination of the two.