Galvanic Corrosion

Galvanic corrosion occurs when two different metals connect in an electrolyte, such as saltwater or moisture. In this electrochemical reaction, one metal becomes the anode and corrodes more rapidly, while the other becomes the cathode and remains protected. You often see it when steel screws join aluminum or brass components. Over time, this process can weaken connections and lead to leaks or part failure. The severity depends on the metal pair, surface finish, and environmental factors like temperature and chloride levels. Engineers and buyers must consider material compatibility, protective coatings, or insulating barriers to prevent damage. Understanding galvanic corrosion helps you select durable fastener materials and ensure long-lasting assemblies.