What does the joining of dissimilar metals in plumbing systems lead to?

The joining of dissimilar metals in plumbing systems leads to galvanic corrosion due to the electrochemical reaction that occurs when two different metals are in contact with each other in the presence of an electrolyte, such as water. This reaction can create an electrochemical cell, which causes one of the metals to corrode more rapidly than it would on its own. The more noble metal (less likely to corrode) acts as a cathode, while the less noble metal (more likely to corrode) serves as an anode. Over time, this can lead to significant deterioration of the anode material, resulting in leaks and possibly even system failure. Understanding this interaction is crucial for ensuring the longevity and safety of plumbing systems, especially when installing or repairing systems that may involve different types of metals.