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.

表征了微观结构，电化学阻抗，Tafel和电位动力学极化，以研究通过激光固相成型（LSF）增材制造工艺生产的Ti-6Al-4V合金的电化学阳极溶解行为，特别着重于在不同平面上的区别。电化学测量表明，LSFed Ti-6Al-4V的阳极溶出特性表明其在不同平面上具有各向异性。在15 wt％的NaCl溶液中，水平面（XOY平面）比垂直平面（XOZ平面）更耐腐蚀。另外，与水平面相比，垂直平面在电化学加工过程中显示出较低的初始加工潜力。Ti-6Al-4V合金镀层的显微组织由主要的α板条和少量的β相组成，与水平面相比，水平面的β相含量高，α相含量低，α板条微细，α板条宽度分布不均匀。这些微观结构特征的差异产生了在垂直和水平面上LSFed Ti-6Al-4V合金在电化学阳极溶解行为中观察到的区别。