What does the rate of galvanic corrosion depend on?

The rate of galvanic corrosion is influenced significantly by the distance between the two metals involved in the process. When two dissimilar metals are in contact within an electrochemical environment, such as in the presence of an electrolyte, the potential difference between them can lead to corrosion of the less noble metal. The separation of these metals—essentially how far apart they are—affects the overall circuit created for the corrosion process to occur.

If the metals are closer together, the current can flow more easily, enhancing the galvanic action and potentially increasing the rate of corrosion. Conversely, increasing the distance can impede the flow of current and reduce the rate of corrosion. This relationship highlights the importance of physical arrangement in galvanic corrosion scenarios.

Other factors also play a role, such as type of metal and temperature, but they are not as directly linked to the operational mechanics that involve distance and current flow.