Tight Tungsten Chemistry

Tight tungsten is a chemically stable substance that is not oxidized at room temperature. When heated to high temperatures above 400 ℃ can be completely oxidized to tungsten trioxide.

At room temperature, compact tungsten will not react with any other concentrations of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, and aqua regia except that it dissolves quickly in the mixture of hydrofluoric acid and concentrated nitric acid. At the same time, dense tungsten does not react with the alkaline solution. However, in the presence of high temperature oxidizer, compact tungsten can be oxidized by the molten alkali to form tungstate.

Tight tungsten dense at high temperatures with hydrofluoric acid in addition to a variety of strong acid reaction and dissolution, but also with carbon, silicon, nitrogen, sulfur and other reactions to generate binary compounds. Among them, it can react with carbon or carbon gas to form tungsten carbide at 1100 ° C, but compact tungsten does not combine with hydrogen, so that it is possible to heat-treat dense tungsten under hydrogen reduction conditions. In the meantime, the acidification of tungstate solution will generate different kinds of isopolyacid ions, which will polymerize into different compact polyoxometalate ions with different pH. Among these are mainly metatungstate ions, paratungstate ions and intermediate polymers and other substances.

Therefore, the chemical properties of dense tungsten are very stable, under normal conditions do not react with strong acids, alkali, high temperature does not react with the molten metal, so compact tungsten can be used as inert elements and other purposes.

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