Hydrogen damage process of dual-phase Ti-6Al-4V alloy: From surface passive film to the interior substrate

被引：6
作者：
Liu, Xiaozhen [1 ,2 ]
Han, En-Hou [1 ,3 ,4 ]
Song, Yingwei [1 ,3 ]
Dong, Kaihui [1 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[3] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China
[4] Inst Corros Sci & Technol, Guangzhou 510535, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2023年 / 464卷
关键词：
Hydrogen damage; Passive film; Microstructure; Ti-6al-4V alloy; Hydrides; CORROSION BEHAVIOR; MICROSTRUCTURAL EVOLUTION; HYDRIDE PRECIPITATION; FORMATION MECHANISM; TITANIUM;
D O I：
10.1016/j.electacta.2023.142916
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Ti alloys show promising application prospects in marine field due to their excellent corrosion resistance. However, hydrogen damage of Ti alloys is inevitable during the actual applications in view of the high susceptibility of Ti to hydrogen. The hydrogen damage process from the surface passive film to the interior Ti substrate of dual-phase Ti-6Al-4 V (TC4) alloy was studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), and secondary ion mass spectroscopy (SIMS). The results indicate that the dense passive film on the surface of TC4 alloy is first replaced by loose corrosion product film which mainly consists of TiH1.5 hydrides, and then hydrogen diffuses into the interior of Ti substrate and forms the hydrides of TiH1.971 which are precipitated along the & alpha;/& beta; interfaces, resulting in the cracks of TC4 alloy. Moreover, the element V which mainly locates in the & beta; phases of TC4 before hydrogen charging is transformed to enrich both in & beta; phases and the hydrides at & alpha;/& beta; interfaces after hydrogen charging.
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页数：12
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