Tantalum has excellent chemical properties and is highly resistant to corrosion. Both in cold and hot conditions, hydrochloric acid, concentrated nitric acid and "aqua regia" are not reactive. Tantalum into the 200 ℃ sulfuric acid immersion for a year, the surface layer of only 0.006 mm damage. Tungsten plate, molybdenum plate, tungsten rod, molybdenum rod, tungsten tube, molybdenum tube, tungsten crucible, molybdenum crucible experiments have proved that the tantalum rod in the normal, alkali solution, chlorine, bromine, dilute sulfuric acid and many other agents are not effective, only in the role of hydrofluoric acid and hot concentrated sulfuric acid reaction. Such a situation is relatively rare among metals.
Tantalum has a wide range of applications due to its properties. In the preparation of a variety of inorganic acid equipment, tantalum can be used to replace stainless steel, life than stainless steel dozens of times. In addition, in the chemical, electronics, electrical and other industries, tantalum can replace the tasks that need to be undertaken by the precious metal platinum in the past, so that the required cost is greatly reduced.
In addition, tantalum is still refining super-strong steel, corrosion-resistant steel and heat-resistant steel alloys of important elements, can provide the development of rockets, spaceships, jet airplanes and other space technology necessary for special materials. Non-magnetic alloys made of tantalum and tungsten are widely used in the electrical industry, especially tantalum carbide composed of tantalum and carbon, which has great hardness, even under high conditions and auriferous steel. Tungsten plate, molybdenum plate, tungsten rod, molybdenum rod, tungsten tube, molybdenum tube, tungsten crucible, molybdenum crucible Turning tools made of it can cut many hard alloys at high speeds; all kinds of drills made of it can be substituted for the hardest alloys or chrysolite. Therefore, tantalum is also regarded as the "vitamin" in smelting.
