Atomic layer deposition of nanometric alumina for corrosion protection of heterogeneous metallic surfaces – The case of aeronautical grade aluminium alloy 2024-T3

Oliveira, Marco P.; Silva, Ricardo M.; Yasakau, K.A.; Bastos, A.C.; Kallip, Silvar; Zheludkevich, Mikhail L.; Silva, Rui; Ferreira, M. G. S.

doi:10.1016/j.corsci.2022.110773

Cited by 5 publications

(2 citation statements)

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“…Nowadays, ALD is widely used in the industry for the deposition of metal and metal nitride films (Al, Ti, AlN, TiN) and the deposition of dielectric thin films (HfO 2 , ZrO 2 , and Al 2 O 3 ) [32][33][34][35][36]. The coatings deposited by ALD provide new applications in diverse areas of corrosion [37] because a thin ALD film serves as an efficient barrier protection against gases [38,39] and liquids [36,40]. Up to now, the most frequently used ALD corrosion protection coating has been Al 2 O 3 , which is usually deposited from trimethyl aluminium (Al(CH) 3 ) and water [39,[41][42][43][44] at temperatures ranging from 33 to 500 • C [37,[45][46][47].…”

Section: Introductionmentioning

confidence: 99%

“…Ultra-thin Al 2 O 3 films have been reported to efficiently protect various metals, such as steel [47][48][49][50], copper [51,52], and aluminium and its alloys [40,47]. In addition to depositing individual films, ALD is also used as a sealing method to block the pinholes in hard coatings prepared via physical and chemical vapour deposition (PVD and CVD) [37,53] and anodised aluminium [54].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Pore Sealing in a Multilayer Si–O–Zr/Al2O3 Coating Designed to Protect Aluminium from Corrosion

Rodič,

Kapun,

Milošev

2023

Metals

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This study deals with the combination of two corrosion protection strategies for aluminium: barrier protection (provided by a 3.8 μm thick hybrid sol–gel coating) and aluminium pore sealing via the use of a 100 nm thick layer of aluminium oxide. A Si–O–Zr hybrid sol–gel coating (TMZ) was synthesised by combining two separately prepared sols (i) tetraethyl orthosilicate and 3-methacryloxypropyl trimethoxysilane and (ii) zirconium(IV) n-propoxide chelated with methacrylic acid. The synthesis of the Si–O–Zr hybrid sol–gel was evaluated at various stages using real-time infrared spectroscopy. A 100 nm thick Al2O3 film was prepared via thermal atomic layer deposition at 160 °C using trimethyl aluminium and water as precursors. The coating and film properties were assessed via focused ion beam/scanning electron microscopy coupled with energy-dispersive X-ray spectrometry. Sealing with the Al2O3 film did not affect the microstructure and composition of the underlying sol–gel coating. The coating’s corrosion performance in 0.1 M NaCl solution was evaluated using electrochemical impedance spectroscopy. Compared to individual coatings, the multilayer TMZ/Al2O3 coating ensured prolonged (more than three weeks) durable corrosion protection for the aluminium. The impedance magnitude increased by two orders compared to the uncoated substrate (|Z|10 mHz from 16 kΩ cm2 to almost 830 MΩ cm2). Thus, the pore sealing of the sol–gel coating using an ALD alumina film produced a protective multilayer coating system, with |Z|10 mHz remaining above 5 MΩ cm2 after four weeks in NaCl solution.

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