Which metal is more likely to corrode in a galvanic setup?

In a galvanic setup, the metal that is more likely to corrode is zinc. This scenario occurs because zinc is less noble compared to the other metals listed, such as silver, gold, and copper, which are more resistant to corrosion.

In a galvanic cell or setup, two different metals are connected, and the electrochemical potential difference between them drives a redox reaction. The metal that acts as the anode (the more anodic or less noble metal) will lose electrons and corrode, while the metal acting as the cathode (the more cathodic or noble metal) will gain electrons and be protected from corrosion.

Zinc's position in the galvanic series indicates that it has a higher tendency to oxidize, which means it will preferentially corrode when placed in contact with more noble metals. This is why zinc is often used as a sacrificial anode in various applications, such as protecting steel in marine environments where corrosion is a concern.

The other metals listed—silver, gold, and copper—are more noble, making them less likely to corrode under similar conditions. Therefore, in a galvanic environment, zinc is clearly the metal that will corrode preferentially.