What causes galvanic corrosion?

Galvanic corrosion occurs when two different metals are electrically connected in the presence of an electrolyte, such as water. This connection allows for the flow of electric current between the metals, leading to corrosion of the more anodic (less noble) metal. The presence of the electrolyte facilitates the electrochemical reactions that lead to corrosion.

In this context, when dissimilar metals are joined together, one metal will lose electrons and corrode preferentially, while the other metal will be protected. The extent of galvanic corrosion depends on the types of metals involved, their respective positions in the electrochemical series, and the characteristics of the electrolyte. Understanding this phenomenon is crucial for water treatment operators to prevent damage to piping systems and other infrastructure in water distribution systems.

The other choices, while they may impact water systems in different ways, do not directly cause galvanic corrosion in the manner described.