| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Härkönen, Emma
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2014Interface control of atomic layer deposited oxide coatings by filtered cathodic arc deposited sublayers for improved corrosion protectioncitations
- 2014Sealing of Hard CrN and DLC Coatings with Atomic Layer Depositioncitations
- 2013Tantalum oxide nanocoatings prepared by atomic layer and filtered cathodic arc deposition for corrosion protection of steelcitations
- 2013AlxTayOz Mixture Coatings Prepared Using Atomic Layer Deposition for Corrosion Protection of Steelcitations
- 2013Hydrogen-argon plasma pre-treatment for improving the anti-corrosion properties of thin Al2O3 films deposited using atomic layer deposition on steelcitations
- 2012Preparation of regularly structured nanotubular TiO2 thin films on ITO and their modification with thin ALD-grown layerscitations
- 2011Failure mechanism of thin Al2O3 coatings grown by atomic layer deposition for corrosion protection of carbon steelcitations
- 2011Corrosion Protection of Steel with Oxide Nanolaminates Grown by Atomic Layer Depositioncitations
- 2011Electrochemical and time-of-flight secondary ion mass spectrometry analysis of ultra-thin metal oxide (Al2O3 and Ta2O5) coatings deposited by atomic layer deposition on stainless steelcitations
- 2011Low-temperature atomic layer deposition of Al2O3 thin coatings for corrosion protection of steelcitations
Places of action
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article
Failure mechanism of thin Al2O3 coatings grown by atomic layer deposition for corrosion protection of carbon steel
Abstract
Combined analysis by electrochemical impedance spectroscopy (EIS), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and field emission scanning electron microscopy (FESEM) of the corrosion protection provided to carbon steel by thin (50 nm) Al2O3 coatings grown by atomic layer deposition (ALD) and its failure mechanism is reported. In spite of excellent sealing properties, the results show an average dissolution rate of the alumina coating of ∼7 nm h−1 in neutral 0.2 M NaCl and increasing porosity of the remaining layers with increasing immersion time. Alumina dissolution is triggered by the penetration of the solution via cracks/pinholes through the coating to the substrate surface where oxygen reduction takes place, raising the pH. At defective substrate surface sites of high aspect ratio and concentrated residual mechanical stress (along scratches) presumably exposing a higher steel surface fraction, localized dissolution of the coating is promoted by a more facile access of the solution to the substrate surface enhancing oxygen reduction. De-adhesion of the coating is also promoted in these sites by the ingress of the anodic dissolution trenching the steel surface. Localized corrosion of the alloy (i.e. pitting) is triggered prior to complete dissolution of the alumina film on the elsewhere still coated surface matrix.