Zirconium (Zirconium) is a chemical element. The element symbol Zr has an atomic number of 40. The simple substance is a high melting point metal with a light gray color. The surface of zirconium is easy to form an oxide film, which has luster, so the appearance is similar to that of steel. It has corrosion resistance and is soluble in hydrofluoric acid and aqua regia. At high temperatures, it can react with non-metallic elements and many metal elements to form a solid solution.