RT Journal Article T1 LDH Post-Treatment of Flash PEO Coatings A1 Olmo, Rubén del A1 Mohedano Sánchez, Marta A1 Mingo, Beatriz A1 Arrabal Durán, Raúl A1 Matykina, Endzhe AB This work investigates environmentally friendly alternatives to toxic and carcinogenic Cr (VI)-based surface treatments for aluminium alloys. It is focused on multifunctional thin or flash plasma electrolytic oxidation (PEO)-layered double hydroxides (LDH) coatings. Three PEO coatings developed under a current-controlled mode based on aluminate, silicate and phosphate were selected from 31 processes (with different combinations of electrolytes, electrical conditions and time) according to corrosive behavior and energy consumption. In situ Zn-Al LDH was optimized in terms of chemical composition and exposure time on the bulk material, then applied to the selected PEO coatings. The structure, morphology and composition of PEO coatings with and without Zn-Al-LDH were characterized using XRD, SEM and EDS. Thicker and more porous PEO coatings revealed higher amounts of LDH flakes on their surfaces. The corrosive behavior of the coatings was studied by electrochemical impedance spectroscopy (EIS). The corrosion resistance was enhanced considerably after the PEO coatings formation in comparison with bulk material. Corrosion resistance was not affected after the LDH treatment, which can be considered as a first step in achieving active protection systems by posterior incorporation of green corrosion inhibitors. PB MDPI SN 2079-6412 YR 2019 FD 2019-05-30 LK https://hdl.handle.net/20.500.14352/12596 UL https://hdl.handle.net/20.500.14352/12596 LA eng NO Ministerio de Economía y Competitividad (MINECO) NO Ministerio de Ciencia e Innovación (MICINN)/FEDER NO Comunidad de Madrid DS Docta Complutense RD 6 oct 2024