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LDH Post-Treatment of Flash PEO Coatings

Departamento de Ciencia de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Author to whom correspondence should be addressed.
Coatings 2019, 9(6), 354;
Received: 25 April 2019 / Revised: 23 May 2019 / Accepted: 28 May 2019 / Published: 30 May 2019
(This article belongs to the Special Issue Plasma Electrolytic Oxidation (PEO) Coatings)
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. View Full-Text
Keywords: PEO; LDH; active protection; corrosion; aluminium PEO; LDH; active protection; corrosion; aluminium
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MDPI and ACS Style

del Olmo, R.; Mohedano, M.; Mingo, B.; Arrabal, R.; Matykina, E. LDH Post-Treatment of Flash PEO Coatings. Coatings 2019, 9, 354.

AMA Style

del Olmo R, Mohedano M, Mingo B, Arrabal R, Matykina E. LDH Post-Treatment of Flash PEO Coatings. Coatings. 2019; 9(6):354.

Chicago/Turabian Style

del Olmo, Rubén, Marta Mohedano, Beatriz Mingo, Raúl Arrabal, and Endzhe Matykina. 2019. "LDH Post-Treatment of Flash PEO Coatings" Coatings 9, no. 6: 354.

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