Dioxide is brown tungsten, which is often called brown tungsten because of its brown appearance. Just like yellow tungsten, blue tungsten and violet tungsten, brown tungsten is commonly known in the industry based on its western color appearance, and some people jokingly call it chocolate color. Tungsten dioxide WO2 (brown tungsten) is a kind of brown powder, hydrogen will reduce tungsten trioxide to form tungsten dioxide at 575~600℃. Tungsten dioxide WO2 is insoluble in water, alkaline solution, hydrochloric acid and dilute sulfuric acid. Nitric acid can oxidize brown tungsten into high-valent oxides. Tungsten dioxide WO2 is quickly oxidized to tungsten trioxide in air, and turns into blue oxide when heated to 500°C in nitrogen oxide. At 1020°C, tungsten dioxide WO2 can be reduced to metal tungsten powder by carbon.
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