Galvanic Couple

Definition

A corrosion cell formed when two dissimilar metals are joined in an electrolyte, driving accelerated attack on the more active metal.

At a fitting where different metals meet, one becomes the anode and corrodes preferentially. It is one of the named corrosion mechanisms in the electrochemistry chapter. It is a common breach point that the corrosion cell exploits. The blueprint treats it as a connection point to inspect.

Related concepts

Oxygen Differential Cell · Passive Film · Corrosion

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Part of The Blueprint of Water · ⚡ electrochemistry