Understanding the Effect of Tungsten on Corrosion Behavior of AlCuCrFeMnWx High-Entropy Alloys in 3.5 wt.% NaCl Solution

• Published in: Journal of materials engineering and performance 2018-09, Vol.27 (9), p.4481-4488
• Main Authors: Kumar, Devesh, Maulik, Ornov, Sharma, V. K., Prasad, Y. V. S. S., Kumar, Vinod
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Tribology
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-018-3536-y

The electrochemical study of AlCuCrFeMnW x ( x  = 0, 0.05, 0.1, 0.5, 1 mol) high-entropy alloys (HEA) is performed in 3.5 wt.% NaCl solution at room temperature (25 °C). The potentiodynamic polarization curve of the AlCuCrFeMnW x ( x  = 0, 0.05, 0.1, 0.5, 1 mol) alloys obtained in 3.5 wt.% NaCl solution shows that the corrosion resistance of the tungsten (W)-free HEA is lower than the alloys containing W. It is observed that W forms solid WO 3 layer in the outer region of the film in a 3.5 wt.% NaCl. The scanning electron microscopy and infrared spectroscopy confirmed the electrochemical results. The electrochemical impedance spectroscopy of these alloys had one capacitive loop, which represented the presence of electrical double layer.