A rust inhibitor is a chemical compound that helps prevent the formation of rust on metal surfaces. Rust occurs when iron or its alloys react with moisture and oxygen, leading to corrosion. By applying a rust inhibitor, the protective layer it creates can significantly extend the lifespan of metal objects, such as tools, vehicles, and machinery. These inhibitors can be found in various forms, including sprays, oils, and coatings. Common types include zinc phosphate, chromates, and organic inhibitors. Using a rust inhibitor is essential for maintaining the integrity of metal products, especially in environments prone to moisture and humidity.