This galvanic corrosion chart compares a variety of metals in electrochemical terms. Metals toward the least noble (anodic) end of the chart will corrode more rapidly in water than metals toward the most noble (cathodic) end.
As salt water (brine) passes into an ECG, chlorine gas is produced around the anode, while hydrogen gas is produced near the cathode. Some ECGs may contain several layers of cells, alternating between anodes and cathodes.
