Write for Us
Converters & Calculators
The Corrosion Resistance Of Niobium Metal Against Metal Melts
Niob exhibits resistance to many metals and chemicals. Its high resistance is attainable at a low mass, and it can be formed at a relatively low temperature. Consequently, it can be processed into coloured coin inserts, corrosion‐resistant evaporation boats and diamond growth crucibles.
Niob is resistant to several metal melts such as Pb, Cd, Cs, Cu, Ga, Li and Mg. However, the material is not resistant to Al, Be, Ni, Zn and Co.
|
Corrosion Resistance Against Metal Melts |
|||
|
Aluminium |
not resistant |
Lithium |
resistant at < 1 000 °C |
|
Beryllium |
not resistant |
Magnesium |
resistant at < 950 °C |
|
Lead |
resistant at < 850 °C |
Sodium |
resistant at < 1 000 °C |
|
Cadmium |
resistant at < 400 °C |
Nickel |
not resistant |
|
Cesium |
resistant at < 670 °C |
Mercury |
resistant at < 600 °C |
|
Iron |
not resistant |
Silver |
resistant at < 1 100 °C |
|
Gallium |
resistant at < 400 °C |
Bismuth |
resistant at < 550 °C |
|
Potassium |
resistant at < 1 000 °C |
Zinc |
not resistant |
|
Copper |
resistant at < 1 200 °C |
Tin |
not resistant |
|
Cobalt |
not resistant |
||
Noble gases can be utilised as protective gases because Niob does not react with them. At elevated temperatures, Niob reacts with oxygen, nitrogen and hydrogen. Oxygen and nitrogen may be removed by annealing the material in a high vacuum at temperatures above 1 700 °C, while hydrogen is removed at approximately 800 °C. This process leads to a material loss due to the formation of volatile oxides and recrystallisation of the structure.
