Ta

1. Introduce – A high-melting-point metal with high density and a low coefficient of thermal expansion that is resistant to acids and alkalis (Although it has low reactivity with aqua regia at temperatures below 150°C, it corrodes in highly concentrated strong acids at high temperatures) – When added to alloys, it raises the melting point, increases strength, and improves ductility, making it a material used in superalloys for jet engines, nuclear reactors, and missiles – It forms the most stable anodic oxide film among all metals; approximately 70% is used in the manufacture...