New Fe-Cr-Mo-(Nb, Ta)-C-B Glassy Alloys with High Glass-Forming Ability and Good Corrosion Resistance
- 1 January 2001
- journal article
- Published by Japan Institute of Metals in MATERIALS TRANSACTIONS
- Vol. 42 (2), 376-379
- https://doi.org/10.2320/matertrans.42.376
Abstract
New Fe-based glassy alloys of Fe45Cr16Mo16C18B5, Fe45Cr16Mo14Nb2C18B5 and Fe45Cr16Mo14Ta2C18B5 were synthesized. They exhibit a large supercooled liquid region (ΔTx) reaching 58 K before crystallization and high reduced glass transition temperatures (Tg⁄Tm) up to 0.62. These values indicate that these Fe-based alloys have a glass-forming ability which is high enough to enable the formation of bulk glassy alloys. The Fe-based glassy alloys have high corrosion resistance in 1, 6 and 12 mol·L−1 HCl solutions at room temperature. The corrosion rates are in the range of 10−4–10−2 mm·y−1. The glassy alloys are spontaneously passivated in 1 and 6 mol·L−1 HCl solutions with wide passive region and low passive current density in the range of 10−2–100 A·m−2. No pitting corrosion is seen even in 12 mol·L−1 HCl solution. The addition of Nb or Ta to the glassy alloys is effective on enhancing the corrosion resistance.Keywords
This publication has 14 references indexed in Scilit:
- Bulk amorphous alloys with high mechanical strength and good soft magnetic properties in Fe–TM–B (TM=IV–VIII group transition metal) systemApplied Physics Letters, 1997
- High Strength Bulk Amorphous Alloys with Low Critical Cooling Rates (Overview)Materials Transactions, JIM, 1995
- Multicomponent Fe-Based Glassy Alloys with Wide Supercooled Liquid Region before CrystallizationMaterials Transactions, JIM, 1995
- The corrosion behavior of sputter-deposited amorphous CrNb and CrTa alloys in 12 M HCl solutionCorrosion Science, 1993
- Electrochemical and XPS studies of the effects of alloying elements on the corrosion behavior of amorphous FeCrMetalloid alloys in 9 M H2SO4Corrosion Science, 1993
- The corrosion behavior of amorphous Fe-Cr-Mo-P-C and Fe-Cr-W-P-C alloys in 6 M HCl solutionCorrosion Science, 1992
- Chemical properties and applications of some amorphous alloysMaterials Science and Engineering, 1988
- Effect of Molybdenum on the Anodic Behavior of Amorphous Fe‐Cr‐Mo‐B Alloys in Hydrochloric AcidJournal of the Electrochemical Society, 1980
- The role of alloying elements in improving the corrosion resistance of amorphous iron base alloysCorrosion Science, 1979
- ESCA study of the passive film on an extremely corrosion-resistant amorphous iron alloyCorrosion Science, 1976