Tantalum has excellent chemical properties and high corrosion resistance. It does not react with hydrochloric acid, concentrated nitric acid and aqua regia under cold or hot conditions. Tantalum was soaked in sulfuric acid at 200℃ for one year, and the surface layer was only damaged by 0.006 mm. Experiments showed that tantalum had no effect on alkali liquor, chlorine gas, bromine water, dilute sulfuric acid and other chemicals at room temperature, but only reacted with hydrogen fluoride and hot concentrated sulfuric acid. This situation is rare in metals.