What happens if dissimilar metals are riveted together without appropriate precautions?

When dissimilar metals are riveted together without appropriate precautions, they may undergo electrolytic corrosion. This occurs because different metals have varying electrochemical potentials. When they come into contact in the presence of an electrolyte, such as moisture or salt water, a galvanic cell can form. In this situation, one metal acts as an anode, and the other as a cathode, leading to accelerated corrosion of the anode. Over time, this corrosion can compromise the structural integrity of the joint, weakening the connection and potentially leading to failure.

It is crucial in aerospace and other engineering applications to take specific measures, such as using barriers or coatings that prevent direct contact between dissimilar metals, thereby minimizing the risk of galvanic corrosion.