Femtosecond laser-induced micro/nanostructures facilitated multiple passivation and long-term anti-corrosion property of laser powder bed fused Ti-6Al-4V alloy

Author Identifier

Lai Chang Zhang: https://orcid.org/0000-0003-0661-2051

Document Type

Journal Article

Publication Title

Corrosion Science

Volume

246

Publisher

Elsevier

School

Centre for Advanced Materials and Manufacturing / School of Engineering

Funders

National Natural Science Foundation of China (62375073) / National Key Research and Development Program of China (2021YFF0502703) / ECU DVC Strategic Research Support Fund (23965)

Comments

Fang, J., Zhang, L. C., Dai, N., Liu, R., Yao, H., Lao, Z., ... & Wu, S. (2025). Femtosecond laser-induced micro/nanostructures facilitated multiple passivation and long-term anti-corrosion property of laser powder bed fused Ti-6Al-4V alloy. Corrosion Science, 246. https://doi.org/10.1016/j.corsci.2025.112757

Abstract

The formation of non-equilibrium phases and microstructural defects reduces the passivation performance and corrosion resistance of laser powder bed fusion (LPBF) produced Ti-6Al-4V alloy, threatening its safe service as important components. This work aims to enhance the corrosion resistance of LPBF-produced Ti-6Al-4V alloy through femtosecond laser surface processing (FLSP). FLSP at lower powers (<300 mW) or higher powers (>400 mW) creates uniform layers of periodic nanostructures and hierarchical micro/nanostructures on the alloy surface. The prolonged exposure to air significantly accelerates the oxidation of Ti2 + to Ti4+ on FLSP-induced micro/nanostructures, resulting in multiple passivation behaviors and remarkable improvement in corrosion resistance.

DOI

10.1016/j.corsci.2025.112757

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