Boosting the corrosion resistance of NiCoV medium entropy alloy against various corrosive environments by laser powder bed fusion fabrication

Kaiyang Li, Yunlong Zhai, You Wu, Xinyu Hu, Renjing Li, Zhiping Xiong, Zhangwei Wang, Weijin Cai*, Naiqiang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

NiCoV medium entropy alloy (MEA) has been fabricated by laser powder bed fusion (LPBF) method, and its improved corrosion resistance than the casting counterpart with cold-rolling and annealing is testified in various solutions, including acidic (H2SO4, pH = 0), salt (3.5 % NaCl), and basic (NaOH, pH = 13) solutions through immersion and electrochemical tests. The NiCoV MEA develops a VO2-rich passive film in H2SO4 and NaCl solutions, and a Co(OH)2-rich passive film in NaOH. In all solutions, the LPBF MEA shows higher corrosion resistance than casting one by developing a passive film with higher stability and fewer defects, which is caused by lower grain boundary density, specific texture and higher residual stress. Compared with other methods like adding alloying elements, LPBF is a more effective way of preparing NiCoV MEAs with improved corrosion resistance in various corrosive environments.

Original languageEnglish
Article number102526
JournalMaterials Today Chemistry
Volume43
DOIs
Publication statusPublished - Jan 2025

Keywords

  • Corrosion resistance
  • Laser powder bed fusion
  • Medium entropy alloy
  • Passive films

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Li, K., Zhai, Y., Wu, Y., Hu, X., Li, R., Xiong, Z., Wang, Z., Cai, W., & Zhang, N. (2025). Boosting the corrosion resistance of NiCoV medium entropy alloy against various corrosive environments by laser powder bed fusion fabrication. Materials Today Chemistry, 43, Article 102526. https://doi.org/10.1016/j.mtchem.2025.102526