PEO Coatings with Active Protection Based on In-Situ Formed LDH-Nanocontainers. Issue 2 (13th December 2016)

• Record Type: Journal Article
• Authors: Serdechnova, M.; Mohedano, M.; Kuznetsov, B.; Mendis, C. L.; Starykevich, M.; Karpushenkov, S.; Tedim, J.; Ferreira, M. G. S.; Blawert, C.; Zheludkevich, M. L.
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 2(2017)
• Page Start: C36
• Page End: C45
• Publication Date: 2016-12-13
• Subjects: AA2024 -- Corrosion inhibitor -- Layered double hydroxides -- Plasma electrolytic oxidation -- self-healing; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0301702jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : In the present work, for the first time Zn-Al layered double hydroxide (LDH) nanocontainers were grown in-situ on the surface and in the pores of plasma electrolytic oxidation (PEO) layer and then loaded with a corrosion inhibitor to provide active protection. The developed LDH-based conversion process ensures partial sealing of the pores and provides an effective corrosion inhibition on demand leading to increased fault-tolerance and self-healing properties. The structure, morphology and composition of the LDH-sealed PEO coatings on 2024 aluminum alloy were investigated using SEM, TEM/FIB, XRD and GDOES. Electrochemical impedance spectroscopy and scanning vibrating electrode techniques show a remarkable increase in the corrosion resistance and fault tolerance when PEO coating is sealed with a LDH-inhibitor treatment.