TY - JOUR
T1 - Boosting the corrosion resistance of NiCoV medium entropy alloy against various corrosive environments by laser powder bed fusion fabrication
AU - Li, Kaiyang
AU - Zhai, Yunlong
AU - Wu, You
AU - Hu, Xinyu
AU - Li, Renjing
AU - Xiong, Zhiping
AU - Wang, Zhangwei
AU - Cai, Weijin
AU - Zhang, Naiqiang
N1 - Publisher Copyright:
© 2025 Elsevier Ltd
PY - 2025/1
Y1 - 2025/1
N2 - 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.
AB - 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.
KW - Corrosion resistance
KW - Laser powder bed fusion
KW - Medium entropy alloy
KW - Passive films
UR - http://www.scopus.com/inward/record.url?scp=85214960778&partnerID=8YFLogxK
U2 - 10.1016/j.mtchem.2025.102526
DO - 10.1016/j.mtchem.2025.102526
M3 - Article
AN - SCOPUS:85214960778
SN - 2468-5194
VL - 43
JO - Materials Today Chemistry
JF - Materials Today Chemistry
M1 - 102526
ER -