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

Journal article (2023)

Authors

M. Liu Team Arjan Mol - Mechanical, Maritime and Materials Engineering , Xi’an Jiaotong University
Jia Ning Zhu Team Vera Popovich - Mechanical, Maritime and Materials Engineering
Vera Popovich Team Vera Popovich - Mechanical, Maritime and Materials Engineering
Evgenii Borisov Peter the Great Saint-Petersburg Polytechnic University
Johannes M.C. Mol Team Arjan Mol - Mechanical, Maritime and Materials Engineering
Y. Gonzalez Garcia Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
Research Group
Team Vera Popovich (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 M. Liu, Jia-Ning Zhu, V. Popovich, E. Borisov, J.M.C. Mol, Y. Gonzalez Garcia
DOI: https://doi.org/10.1007/s12598-023-02329-6
More Info
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Published Date

2023

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Vera Popovich

Abstract

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.]