Distinction in anodic dissolution behavior on different planes of laser solid formed Ti-6Al-4V alloy. (1st September 2018)

• Record Type: Journal Article
• Authors: Li, Jiaqiang; Lin, Xin; Zheng, Min; Wang, Jian; Guo, Pengfei; Qin, Tuo; Zhu, Minghui; Huang, Weidong; Yang, Haiou
• Is Part Of: Electrochimica acta. Volume 283(2018)
• Page Start: 1482
• Page End: 1489
• Publication Date: 2018-09-01
• Subjects: Additive manufacturing -- Laser solid forming -- Titanium alloy -- Anodic dissolution -- Electrochemical machining; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.07.112
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Microstructure, electrochemical impedance, and Tafel and potentiodynamic polarizations were characterized to investigate the electrochemical anodic dissolution behavior of Ti-6Al-4V alloy produced by the laser solid forming (LSF) additive manufacturing process with a specific focus on the distinction on different planes. Electrochemical measurements show that the anodic dissolution characteristic of LSFed Ti-6Al-4V reveals anisotropic behavior on different planes. The horizontal-plane (XOY plane) is more resistant to corrosion than the vertical-plane (XOZ plane) in 15 wt% NaCl solution. Additionally, the vertical-plane shows a lower initial machining potential for the process of electrochemical machining compared to the horizontal-plane. The microstructure of Ti-6Al-4V alloy deposit is composed of dominant α-laths and small amounts of β phase, and its horizontal-plane has higher content of the β phase, lower content of the α phase, slightly finer α-laths, and more uneven α-lath width distribution compared to the vertical-plane. These differences in the microstructural characteristics produce the distinctions observed in the electrochemical anodic dissolution behavior of LSFed Ti-6Al-4V alloy on the vertical- and horizontal-planes.