Mora-Sanchez, H.Ramos, C.Mohedano Sánchez, MartaTorres, B.Arrabal Durán, RaúlMatykina, Endzhe2024-07-082024-07-082024-04MORA-SANCHEZ, H.; RAMOS, C.; MOHEDANO, M.; TORRES, B.; ARRABAL, R.; MATYKINA, E. Flash plasma electrolytic oxidation and electrochemical behaviour in physiological media of additive manufacturing Ti6Al4V alloy. Transactions of Nonferrous Metals Society of China 2024, 34, 1150-1166 DOI:10.1016/S1003-6326(23)66460-X.1003-632610.1016/S1003-6326(23)66460-Xhttps://hdl.handle.net/20.500.14352/105820The objective of this work is to understand the plasma electrolytic oxidation (PEO) treatment and electrochemical behaviour of a Ti6Al4V alloy manufactured by a laser powder bed fusion additive manufacturing (AM) technique known as direct metal laser sintering (DMLS). Ca and P-containing coatings were produced with short time (<120 s) PEO treatments (also termed as Flash-PEO) obtaining 3–10 μm-thick coatings on both the AM alloy and a conventional counterpart. Subsequently, the electrochemical behaviour of the bare and treated alloys was assessed in a modified α-MEM solution via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The fine α-lamellar microstructure of the AM alloy with small β-phase particles at the interlamellar spaces was seen to advance the onset of sparking promoting faster growth of PEO coating in comparison to the conventional alloy. Flash-PEO coatings enhanced the corrosion protection of both conventional and AM alloys, the thinnest (<3 μm) coatings providing up to three times greater protection. AM Ti6Al4V was found to be susceptible to localized crevice corrosion which could be assigned to the high grain boundary density. Flash-PEO treatments, even as short as 35 s, were sufficient to successfully prevent it.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal articlehttps://www.sciencedirect.com/science/article/pii/S100363262366460X?dgcid=rss_sd_allopen access66additive manufacturinglaser powder bed fusionplasma electrolytic oxidationFlash-PEOtitaniumcrevice corrosionα-MEMMateriales3312 Tecnología de Materiales3303 Ingeniería y Tecnología Químicas