| Full text | |
| Author(s): |
Yao, Jie-Yi
;
Serrano, Leandro Bernardes
;
Santos, Sydney Ferreira
;
Cardoso, Katia Regina
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Corrosion Science; v. 218, p. 11-pg., 2023-04-11. |
| Abstract | |
Novel high-entropy alloys (HEAs) of the Ti(30-x)VCrNb(x) (x = 0, 5, 10, 15, and 20 at%) system were designed, synthesized, and characterized. The microstructural features were investigated by XRD, SEM, and EDS. The corrosion behavior was evaluated in 3.5 wt% sodium chloride (NaCl) solution of pH 5 at 25 degrees C by potentiody-namic polarization and electrochemical impedance spectroscopy (EIS). The investigated HEAs exhibited a single-phase BCC solid solution with dendritic microstructures. The polarization curves showed the Ti10V35Cr35Nb20 (Nb20) HEA exhibited the best corrosion resistance with the lowest corrosion current density (2.24 mu A/cm2) and corrosion rate (1.15 x 10-2 mm/yr). The interpretation of an equivalent electric circuit (EEC) suggested the formation of a stable passive oxide film on the HEAs, as indicated by good capacitive behavior and high impedance values (>104 omega cm2) at low frequencies and phase angles close to -80 degrees. This study demonstrated that an appropriate Nb content can stabilize the BCC phase and significantly enhance the corrosion resistance of the HEAs. (AU) | |
| FAPESP's process: | 19/22183-6 - Electrocatalysis VI: fundamental and applied aspects of emerging and classical problems in electrochemical energy conversion |
| Grantee: | Edson Antonio Ticianelli |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/25302-6 - High entropy alloys for hydrogen storage |
| Grantee: | Kátia Regina Cardoso |
| Support Opportunities: | Regular Research Grants |