Vargas Carlos A, Zuleta Alejandro A, Botero Carlos A, Baena Libia M, Castaño Juan G, Gómez Maryory A, Tamayo Jose A
Grupo Materiales Avanzados y Energía (MATyER), Instituto Tecnológico Metropolitano -ITM-, Medellín, Antioquia, 050034, Colombia.
Grupo de Investigación de Estudios en Diseño - GED, Facultad de Diseño Industrial, Universidad Pontificia Bolivariana, Sede Medellín, Circular 1 No 70-01, Medellín, Colombia.
Heliyon. 2023 Aug 19;9(9):e19289. doi: 10.1016/j.heliyon.2023.e19289. eCollection 2023 Sep.
This study investigates and compares plasma electrolytic oxidation (PEO) coatings produced on wrought Ti6Al4V alloy substrates with those resulting from electron beam powder bed fusion (PBF-EB). For a duration of 1000 s, a phosphate/silicate electrolyte with a current density of 50 A/cm was employed to fabricate the coatings. Surface and polished cross-sections of the coated specimens underwent SEM and X-ray diffraction (XRD) analyses. The obtained coatings exhibit differences of up to approximately 18% in thickness and formation, as well as in their anatase phase. The anatase phase is present at a level of 54.09% in the substrates processed by PBF-EB and 38.54% in wrought substrates. After 1000 s of PEO, the coatings formed on the wrought substrates exhibited higher porosity and larger pores (>1 μm) compared to those produced on the PBF-EB specimens. The PBF-EB coatings had lower porosity because they contained fewer pores larger than 1 μm. The findings imply that the unique microstructural arrangement of PBF-EB-produced additively made Ti6Al4V materials plays a significant impact in the development and morphological properties of PEO oxide coatings.
本研究对在变形Ti6Al4V合金基体上制备的等离子体电解氧化（PEO）涂层与电子束粉末床熔融（PBF-EB）制备的涂层进行了研究和比较。采用电流密度为50 A/cm²的磷酸盐/硅酸盐电解液，持续1000 s来制备涂层。对涂层试样的表面和抛光横截面进行了扫描电子显微镜（SEM）和X射线衍射（XRD）分析。所获得的涂层在厚度、形成以及锐钛矿相方面表现出高达约18%的差异。在PBF-EB处理的基体中，锐钛矿相含量为54.09%，在变形基体中为38.54%。经过1000 s的PEO处理后，与PBF-EB试样上制备的涂层相比，变形基体上形成的涂层具有更高的孔隙率和更大的孔隙（>1μm）。PBF-EB涂层的孔隙率较低，因为其大于1μm的孔隙较少。研究结果表明，PBF-EB制备的增材制造Ti6Al4V材料独特的微观结构排列对PEO氧化物涂层的形成和形态特性具有重大影响。
