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논문 기본 정보

자료유형
학술저널
저자정보
Lvjun Zhou (Sichuan University) Huichao Liu (Sichuan Water Conservancy Vocational College) Chenglu Yan (The Second Research Institute of Civil Aviation Administration of China (CAAC)) Yongqiang Wei (The Second Research Institute of Civil Aviation Administration of China (CAAC)) Zuxi Xia (The Second Research Institute of Civil Aviation Administration of China (CAAC)) Huaqiao Peng (The Second Research Institute of Civil Aviation Administration of China (CAAC)) Jun Tang (Sichuan University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.7
발행연도
2024.7
수록면
1,864 - 1,877 (14page)
DOI
10.1007/s12540-023-01607-3

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Electrochemical dissolution behavior of laser powder bed fusion (L-PBF) Ti–6Al–4V alloy is investigated in a 3.5 wt% NaClsolution through electrochemical impedance spectroscopy (EIS), potentiostatic polarization, and Mott–Schottky analysis.To investigate the effect of microstructure on the corrosion passivation film and corrosion resistance, the microstructure(martensitic α′/α + β phases and α grain boundaries (αGB)) of L-PBF Ti–6Al–4V alloys was modified via heat treatment.The microstructural results indicate that the heat treatment at 950 °C (HT-950) lead to a higher volume fraction of β phaseand finer α-laths, compared with those under other heat treatment temperatures. Intriguingly, the corrosion resistance of theHT-950 sample is significantly higher than that of the others because the refinement of grains contributes to preventing corrosion.The stable passivation film is attributed to the decrease in donor density (oxygen vacancies) and vacancy diffusioncoefficients with increasing the film formation potential. This work illustrates the mechanism of passivation film during thecorrosion process of L-PBF Ti–6Al–4V alloy, and would be helpful to develop additively manufactured Ti–6Al–4V alloyswith a better corrosion resistance.

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