The question of whether this precious metal corrodes is a common inquiry. The process observed on its surface is not, in fact, rust. Rust, by definition, is the oxidation of iron. Sterling silver is primarily composed of silver, with a small percentage of other metals, usually copper, added to enhance its durability. Therefore, the reddish-brown flaking characteristic of rust is not the type of degradation that affects this alloy.
Understanding the distinction is important for the proper care and maintenance of silver items. The tarnishing process, which is often mistaken for rust, is a chemical reaction with sulfur-containing compounds in the air. This reaction forms silver sulfide, a dark coating on the surface. While this tarnish can detract from the aesthetic appeal of the item, it does not compromise the structural integrity of the metal in the same way that rust weakens iron. Historically, silver’s resistance to oxidation compared to iron has made it a valuable material for coinage, jewelry, and tableware.
