News 16. 04. 24:SML Ti Tube Grade 5
Request a QuoteStay competitive! Through Delivery Time, Quantity and Price!
Download
Titanex' stocklists (Ti)Anfrage / Bedarf
Steigern Sie Ihre Wettbewerbsfähigkeit! Durch Lieferzeit, Menge und Preis!
Titanex' Lagerlisten holen!
PDF downloads» Niobium Corrosion Resistance
The corrosion resistance of niobium is more limited than tantalum and this must be taken into consideration. The limitation stems from its sensitivity to most alkalis and certain strong oxidants.
Niobium is totally resistant to such highly corrosive media as wet or dry chlorine, bromine, saturated brines, ferric chloride, hydrogen sulfide, and sulfur dioxide as well as nitric and chromic acids. It is also resistant to sulfuric and hydrochloric acids within specific temperature and concentration limits.
Niobium is also resistant to attack by many liquid metals such as: Li <1000°C, Na, K + NaK <1000°C, ThMg <850°C, U <1400°C, Zn <450°C, Pb <850°C, Bi <500°C and Hg <600°C.
Niobium has the ability to form stable, passive oxides and therefore, it can provide unique solutions to many corrosion problems. However, niobium cannot be used in air at temperatures exceeding 200°C.
| Media | Concentration | Temp. | Nb |
| Acetic Acid | 50% | Boiling | Nil |
| Bromine | Dry | 200°F | Nil |
| Chlorine | Wet | 220°F | Nil |
| Chromic Acid | 50% | Boiling | 1 mpy |
| Hydrochloric Acid | 5% | 200°F | 1 mpy |
| 30% | 200°F | 5 mpy | |
| Nitric Acid | 65% | Boiling | <2 mpy |
| Sodium Hydroxide | 10% | Room | * |
| Sulfuric Acid | 40% | Boiling | 20 mpy |
| 98% | Boiling | attacked |
*Material may become brittle due to hydrogen attack
However, niobium is totally resistant to such highly corrosive media as wet or dry chlorine, bromine, saturated brines, ferric chloride, hydrogen sulfide, and sulfur dioxide as well as nitric and chromic acids. It is also resistant to sulfuric and hydrochloric acids within specific temperature and concentration limits.
Niobium is also resistant to attack by many liquid metals such as: Li <1000°C, Na, K + NaK <1000°C, ThMg <850°C, U <1400°C, Zn <450°C, Pb <850°C, Bi <500°C and Hg <600°C.
Niobium has the ability to form stable, passive oxides and therefore, it can provide unique solutions to many corrosion problems. However, niobium cannot be used in air at temperatures exceeding 200°C. Refer to the table entitled Corrosion Resistance for additional information.
