Indeed, it is. I think I was vaguely aware of them previously, but I ran across a reference to sacrificial (galvanic) anodes a ways back. Fascinating.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Galvanic_anode" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Galvanic_anode</a><p><i>A galvanic anode is the main component of a galvanic cathodic protection (CP) system used to protect buried or submerged metal structures from corrosion.<p>They are made from a metal alloy with a more &quot;active&quot; voltage (more negative reduction potential &#x2F; more positive electrochemical potential) than the metal of the structure. The difference in potential between the two metals means that the galvanic anode corrodes, so that the anode material is consumed in preference to the structure.</i><p>Essentially, the galvanic anode is &quot;sacrificed&quot; as corrosion attacks <i>it</i> rather than other bits of your mostly-metal structure in salt water.