Cavitation erosion-corrosion properties of as-cast NiTi and LPBF NiTi in 3.5 wt% NaCl solution: A comparison investigation.
5 affiliations
- 1School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
- 2School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China. Electronic address: [email protected].
- 3Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. Electronic address: [email protected].
- 4Navy Submarine Academy, Qingdao 260199, China.
- 5Navy Submarine Academy, Qingdao 260199, China. Electronic address: [email protected].
Abstract
This study aimed to clarify how the laser powder bed fusion (LPBF) process modifies the cavitation erosion-corrosion (CE-corrosion) behaviour of NiTi alloys in a 3.5 wt% NaCl solution, through a systematic comparison with an as-cast NiTi counterpart. Ultrasonic CE-corrosion mass-loss tests, potentiodynamic and potentiostatic polarisation, Mott-Schottky analysis, and X-ray photoelectron spectroscopy were combined to correlate microstructure, passive-film properties, and damage evolution. After 20 h of CE, the cumulative mass loss of the LPBF NiTi alloy reached 5.65 mg, approximately 2.57 times that of the as-cast alloy (2.20 mg), and its steady-state mass-loss rate (∼0.28 mg·h⁻¹) was about 2.6 times that of the as-cast alloy (∼0.11 mg·h⁻¹). Rapid solidification generated a metastable B19' martensitic phase and a high density of process-induced defects in the LPBF alloy. Its passive film contained a higher fraction of low-valence oxides (TiO) and exhibited a higher donor density than that of the as-cast alloy, indicating a less protective barrier layer. Failure mechanism analysis revealed that microgalvanic corrosion and stress acted synergistically to accelerate passive-film rupture and substrate damage in the LPBF alloy. These findings establish the relationships among microstructure, passive-film characteristics, electrochemical behaviour, and CE resistance, thereby providing an experimental and mechanistic basis for enhancing the marine-service performance of LPBF NiTi alloys.
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BibTeX
@article{fei2026cavitation,
title = {{Cavitation erosion-corrosion properties of as-cast NiTi and LPBF NiTi in 3.5 wt% NaCl solution: A comparison investigation.}},
author = {Ruoyu Fei and Zhou Yang and Huiling Zhou and Xiang Cai and Lianmin Zhang and Lanlan Yang and Feng Xiao and Qichao Zhang and Yanxin Qiao},
journal = {Ultrasonics sonochemistry},
year = {2026},
month = oct,
doi = {10.1016/j.ultsonch.2026.108122},
url = {https://europepmc.org/article/MED/42896427},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Cavitation erosion-corrosion properties of as-cast NiTi and LPBF NiTi in 3.5 wt% NaCl solution: A comparison investigation.
AU - Ruoyu Fei
AU - Zhou Yang
AU - Huiling Zhou
AU - Xiang Cai
AU - Lianmin Zhang
AU - Lanlan Yang
AU - Feng Xiao
AU - Qichao Zhang
AU - Yanxin Qiao
PY - 2026
DA - 2026/10/17
JO - Ultrasonics sonochemistry
DO - 10.1016/j.ultsonch.2026.108122
UR - https://europepmc.org/article/MED/42896427
AB - This study aimed to clarify how the laser powder bed fusion (LPBF) process modifies the cavitation erosion-corrosion (CE-corrosion) behaviour of NiTi alloys in a 3.5 wt% NaCl solution, through a systematic comparison with an as-cast NiTi counterpart. Ultrasonic CE-corrosion mass-loss tests, potentiodynamic and potentiostatic polarisation, Mott-Schottky analysis, and X-ray photoelectron spectroscopy were combined to correlate microstructure, passive-film properties, and damage evolution. After 20 h of CE, the cumulative mass loss of the LPBF NiTi alloy reached 5.65 mg, approximately 2.57 times that of the as-cast alloy (2.20 mg), and its steady-state mass-loss rate (∼0.28 mg·h⁻¹) was about 2.6 times that of the as-cast alloy (∼0.11 mg·h⁻¹). Rapid solidification generated a metastable B19' martensitic phase and a high density of process-induced defects in the LPBF alloy. Its passive film contained a higher fraction of low-valence oxides (TiO) and exhibited a higher donor density than that of the as-cast alloy, indicating a less protective barrier layer. Failure mechanism analysis revealed that microgalvanic corrosion and stress acted synergistically to accelerate passive-film rupture and substrate damage in the LPBF alloy. These findings establish the relationships among microstructure, passive-film characteristics, electrochemical behaviour, and CE resistance, thereby providing an experimental and mechanistic basis for enhancing the marine-service performance of LPBF NiTi alloys.
SN - 1350-4177
SN - 1873-2828
ER -