Improved corrosion and long-term immersion behavior in 3.5 wt% NaCl solution of laser powder bed fusion produced Ti5Cu after heat treatment
Author Identifier
Peng Qin
https://orcid.org/0000-0003-2557-197X
Hongqi Sun
https://orcid.org/0000-0003-0907-5626
Lai-Chang Zhang
Document Type
Journal Article
Publication Title
Advanced Engineering Materials
Volume
26
Issue
4
Publisher
Wiley
School
School of Engineering / School of Science / Centre for Advanced Materials and Manufacturing
RAS ID
60115
Funders
Industrial Project “Corrosion behavior of metallic materials fabricated by 3D printing”
Abstract
This work investigates the corrosion behavior and mechanism of laser powder bed fusion produced (LPBFed) Ti5Cu and its heat-treated counterparts in 3.5 wt% NaCl solution. The results indicate that heat treatment can enhance the corrosion resistance of LPBFed Ti5Cu by generating Ti2Cu phase, and heat treatment at higher temperature enhances corrosion resistance by forming a stable oxide film with a lower electron diffusion rate. The existence of Ti2Cu phase in the heat-treated sample acts as the microanode that decelerates the corrosion on a-Ti phase (prior dissolution of Ti2Cu phase). The long-term immersion test results also confirm that the Ti2Cu phase present in HT900 (at higher heat-treatment temperature) provides a better protective effect against corrosion compared to the one in HT740 and as-LPBFed samples. Compared with the heat-treated counterparts, the worst corrosion resistance of the as-LPBFed Ti5Cu is attributed to that the acidic environment (e.g., Cl−) increases the electron diffusion rate in the film/solution interface, which makes the thermodynamically unstable a'-Ti phase be preferentially corroded.
DOI
10.1002/adem.202300526
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Comments
Wang, X., Qin, P., Sun, H., & Zhang, L. C. (2024). Improved corrosion and long-term immersion behavior in 3.5 wt% NaCl solution of laser powder bed fusion produced Ti5Cu after heat treatment. Advanced Engineering Materials, 26(4). https://doi.org/10.1002/adem.202300526