Een waas of laag op metaal, veroorzaakt door oxydatie.氧化在金屬上形成的任何薄膜或塗層。A reddish powder composed of iron oxide and hydrated iron oxide that forms on the surface of iron and iron alloys. Rust is formed by the oxidation of iron in the presence of moisture. At least 40% humidity is required for the corrosion to occur.Cualquier película o recubrimiento en metal causado por oxidación.