The influence of low degree of deformation on the corrosion resistance of pure tantalum in corrosive media

• Published in: International journal of refractory metals & hard materials 2024-12, Vol.125, p.106899, Article 106899
• Main Authors: Yuan, Junjun, Wang, Yingjun, Hou, Xiao, Zhong, Jianhui, Tan, Dunqiang
• Format: Article
• Language: English
• Subjects: Corrosion resistance; Crystallographic orientation; Deformation; Geometrically necessary dislocations; Pure tantalum
• ISSN: 0263-4368
• DOI: 10.1016/j.ijrmhm.2024.106899

This study investigates the influence of minor deformation on the corrosion resistance of pure tantalum in strongly acidic and alkaline solutions. The electrochemical behavior of samples with varying degrees of deformation was characterized through open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results indicate that in acidic solutions, the corrosion current density and EIS results suggest that low degree deformation reduces the corrosion resistance of tantalum viewed from a kinetic perspective. Conversely, in alkaline solutions, the corrosion potential shifts towards more positive values, but the corrosion current density remains relatively stable, and the electrochemical impedance increases, indicating enhanced corrosion resistance in minor deformed tantalum samples. Analysis reveals that in acidic solutions, the corrosion resistance is primarily affected by the density of geometrically necessary dislocations and the degree of strain, whereas in alkaline solutions, the crystal orientation and grain boundaries are the predominant factors influencing the corrosion resistance. •The corrosion resistance of tantalum with low degrees of deformation in solutions has been investigated.•In acidic solutions, the corrosion resistance of tantalum with low degrees of deformation is notably reduced.•In alkaline solutions, an increase in corrosion resistance with greater deformation is observed.