Investigation of the compatibility between ADS target material with coolant

The compatibility tests for the forging tungsten with coolants are performed in sodium at 500, 600 and 700 degree C, and in water at 100 degree C. The results show: a compact WxOy film is formed at the surface of the tungsten, its thickness is about 1 - 2 μm. There are also corrosion product NaxWOy on the surface of the specimens, the amount of NaxWOy dependents on the temperature and the oxygen content in the sodium. After test for more than 400 h, the matrix of tungsten is not attacked further by sodium and oxygen resulting from the protection of the WxOy film, the thickness of WxOy film and the weight loss become a constant; for the corrosion of the tungsten in water, a WxOy film at the specimen surface is formed at the beginning of the test, its thickness is about 0.8 μm; This film is porous and loose, and they peels off after test for more than 100 h. The new oxide film does not form again because of the lack of the oxygen, the weight loss of the specimens is near a constant