Corrosion and passive film characteristics of 3D-printed NiTi shape memory alloys in artificial saliva

Corrosion and passive film characteristics of 3D-printed NiTi shape memory alloys in artificial saliva

Liu, M. (TU Delft Team Arjan Mol; Xi’an Jiaotong University)
Zhu, Jia-Ning (TU Delft Team Vera Popovich)
Popovich, V. (TU Delft Team Vera Popovich)
Borisov, E. (Peter the Great Saint-Petersburg Polytechnic University)
Mol, J.M.C. (TU Delft Team Arjan Mol)
Gonzalez Garcia, Y. (TU Delft Team Yaiza Gonzalez Garcia)

2023

Electrochemical tests and surface analysis were applied to study the corrosion behavior and passive film characteristics of three-dimensional-printed NiTi shape memory alloys fabricated by laser-powder bed fusion (L-PBF) in artificial saliva at 37 °C. The passivity of L-PBF NiTi shows to be influenced by the process parameters and resulting morphological and physicochemical surface properties. The results show that the defects at the surface of L-PBF NiTi can promote the passivation rate in the early stages of exposure but a slowly formed passive film shows the best corrosion protection. The thickness of the passive film is positively correlated with its corrosion protective performance. The L-PBF NiTi alloy prepared at a linear energy density of 0.2 J·m⁻¹ and volumetric energy density of 56 J·mm⁻³ shows the least defects and best corrosion protection. An outer Ti-rich and inner Ni-rich dense passive film could be also obtained showing higher corrosion resistance. Graphic Abstract: [Figure not available: see fulltext.]

Artificial saliva
Corrosion resistance
Laser-powder bed fusion (L-PBF)
NiTi
Passive film

http://resolver.tudelft.nl/uuid:d1fe703a-0973-4455-96e5-f817e5ab2ab6

https://doi.org/10.1007/s12598-023-02329-6

1001-0521

Rare Metals, 42 (9), 3114-3129

Institutional Repository

journal article

© 2023 M. Liu, Jia-Ning Zhu, V. Popovich, E. Borisov, J.M.C. Mol, Y. Gonzalez Garcia