What is the process called when two dissimilar metals are in contact and the more chemically active metal corrodes?

The process when two dissimilar metals come into contact, leading to corrosion of the more chemically active metal, is known as galvanic corrosion. This phenomenon occurs due to the electrochemical reaction between the metals, where one metal acts as an anode and the other as a cathode. The more reactive metal (the anode) oxidizes, losing electrons and corroding at a faster rate, while the less reactive metal (the cathode) is protected from corrosion.

Understanding this concept is crucial in the field of autobody repair and maintenance, as it provides insight into how different metals can interact in automotive structures or components. Effective measures, such as using protective coatings or ensuring proper insulation between dissimilar metals, can mitigate this type of corrosion.

The other processes mentioned do not describe this specific interaction between dissimilar metals. Electrolytic corrosion refers to corrosion that occurs in the presence of an electrolyte but does not specifically involve dissimilar metals in contact with each other. Oxidative corrosion is a broader term that may imply a variety of reactions and does not specifically highlight the interaction between two types of metals. Lastly, the rusting process specifically refers to the corrosion of iron and its alloys, which is quite distinct from the galvanic corrosion scenario.