Tantalum Foil

Tantalum, a metallic element found chiefly in tantalite and associated with niobium. Tantalum has moderate hardness and ductility, and can be drawn into thin wire foils. Its coefficient of thermal expansion is very small. Tantalum has excellent chemical properties and extremely high corrosion resistance. No matter in cold and hot conditions, it does not react to hydrochloric acid, concentrated nitric acid and aqua regia. Can be used to manufacture evaporation utensils, but also can do the electrode of the vacuum tube, rectifier, electrolytic, capacitor. Used in medicine to make thin sheets or thin threads to repair damaged tissue. Although tantalum is highly resistant to corrosion, its resistance is due to the formation of a stable tantalum pentoxide (Ta2O5) protective film on the surface.

Tantalum foil also has excellent chemical properties, with extremely high corrosion resistance, no matter in cold or hot conditions, no reaction to hydrochloric acid, concentrated nitric acid. Tantalum, however, can be corroded in hot concentrated sulfuric acid. Below 150℃, tantalum will not be corroded by concentrated sulfuric acid, and it will react only when the temperature is higher than this. The corroded thickness is 0.0004 mm when the tantalum is immersed in sulfuric acid at 175 ℃ for one year. At 250 ° C, the corrosion rate increases to 0.116 mm per year, and at 300 ° C, the corrosion rate accelerates even faster. After soaking for 1 year, the surface is corroded 1.368 mm. Sulphuric acid (containing 15 percent SO3) corroded more quickly than sulfuric acid. After soaking in the solution at 130 degrees Celsius for a year, the thickness of the surface corroded was 15.6 millimeters.