In a process named for these objects, a thick oxide layer is applied to a metal to make it more durable.
In a process named for these objects, a thick oxide layer is applied to a metal to make it more durable. That process is most commonly applied to aluminum. To prevent corrosion, especially in marine environments, zinc coatings often are used as a "sacrificial" sort of this device. Chlorine gas is formed at this device when salt water is electrolysed. Electrons flow into a galvanic cell at this terminal, which is negatively charged, and which is where oxidation occurs. For 10 points, name this electrode which, when coupled with a cathode, forms an electrochemical cell. 
In a process named for these objects, a thick oxide layer is applied to a metal to make it more durable.
anode [accept anodization or word forms; prompt on "electrode"] 