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The Role of Cu-Based Intermetallic on the Direct Growth of a ZnAl LDH Film on AA2024 Vrije Universiteit Brussel

A. C. Bouali, M. Serdechnova, K. A. Yasakau, Alexander Lutz, G. Wiese, Herman Terryn, M. G.S. Ferreira, M. L. Zheludkevich

The direct ZnAl layered double hydroxide growth on AA2024 is a fast-occurring reaction, yet is characterized by an inhomogeneous film thickness. It has been shown that at the periphery of Cu-rich intermetallic, the flakes tend to be larger and denser. A combination of in situ and ex situ measurements were used to monitor the changes in the layered double hydroxide film grown on the regions of intermetallics. Immediately after immersion, an ...

Improvement of wear and corrosion protection of PEO on AA2024 via sol-gel sealing Vrije Universiteit Brussel

Luciane Sopchenski Santos, Julien Robert, Matthieu Touzin, Arnaud Tricoteaux, Marie Georges Olivier

Plasma electrolytic oxidation (PEO) is a versatile and cost-effective technique to obtain protective oxide coatings in light metals, although its intrinsic porosity is a drawback for long-term corrosion resistance. Sol-gel layers are pointed as a useful tool to seal PEO porosity and increase its corrosion resistance, although little is known about its influence on the wear performance of PEO coatings. In this study, a PEO coating obtained on ...

Improvement of the corrosion performance of AA2024 alloy by a duplex PEO/clay modified sol-gel nanocomposite coating Vrije Universiteit Brussel

Sajjad Akbarzadeh, Luciane Sopchenski Santos, Véronique Vitry, Yoann Paint, Marie Georges Olivier

Due to the intrinsic porosity of the layers formed by the plasma electrolytic oxidation (PEO) process, the application of silane-based coatings as an eco-friendly layer is a promising way to diminish penetration of the corrosive species into the PEO coating by pores sealing. In this study, to enhance the corrosion protection of AA2024, the performance of the duplex system achieved by adding different concentrations in sodium montmorillonite ...

Fatigue crack propagation of AA2024 alloy under texture control using crystal plasticity coupled with accelerated cyclic cohesive zone model Ghent University

Qi Zhao, Magd Abdel Wahab, Yong Ling, Zhiyi Liu, Dagang Wang
The texture for AA2024 alloy is a predominant factor in the control of Fatigue Crack Propagation (FCP) behavior, and this texture feature can be well simulated using Crystal Plasticity (CP) methodology. Besides, Cyclic Cohesive Zone Model (CCZM) possesses the higher reliability than Cohesive Zone Model (CZM) in simulating FCP behavior because of its consideration of damage evolution law. In this work, CP is first integrated with CCZM to predict ...

Grain-orientation induced stress formation in AA2024 monocrystal and bicrystal using Crystal Plasticity Finite Element Method Ghent University

Qi Zhao, Magd Abdel Wahab, Yong Ling, Zhiyi Liu
Stress formation of monocrystals and bicrystals is investigated in specific oriented grains and grain boundaries of AA2024 alloy by using Crystal Plasticity Finite Element Method (CPFEM). The simulations show that the maximum Schmid factor (SF) value and the number of equivalent initial slip system (EISS) play a principal role in controlling the magnitude of internal stress within monocrystals. For bicrystal model, Goss and Cube grains are not ...

Modeling localized aluminum alloy corrosion in chloride solutions under non-equilibrium conditions: Steps toward understanding pitting initiation Vrije Universiteit Brussel

Levente-Csaba Abodi, James Derose, Steven Van Damme, Andrei stefan Demeter, Johan Deconinck
A multi ion transport and reaction model has been developed with the intent to improve via simulation the understanding of the first steps of localized corrosion (pitting) of aluminum alloys at the microscale. However, the onset of pitting could not be predicted, but the simulation of all parts of a micropolarization curve, excluding the pitting regime, was possible. Unlike previous models, the model does not use the assumption that the system ...

Laterally-resolved formation mechanism of a lithium-based conversion layer at the matrix and intermetallic particles in aerospace aluminium alloys Vrije Universiteit Brussel

A. Kosari, Frans Tichelaar, Peter Visser, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

Lithium leaching coatings have recently been developed as eco-friendly active corrosion protection technology for aerospace aluminium alloys (AAs) by the formation of a conversion layer at coating defects. While general conversion layer formation characteristics were studied and reported before, here we study the local layer formation process with sub-micron resolution at and around intermetallic particles (IMPs) in AA2024-T3. Top- and ...

Active corrosion protection of various aluminium alloys by lithium-leaching coatings Vrije Universiteit Brussel

Peter Visser, Herman Terryn, Johannes M. C. Mol

This study presents the active protective properties of lithium-leaching coatings for a range of aluminium alloys. Coatings with and without lithium carbonate as leachable inhibitor were applied on the aluminium alloys, artificially damaged and exposed to the neutral salt spray. A combined approach of scanning electron microscopy and electrochemical measurements revealed that the lithium carbonate leaching coating provided effective corrosion ...

Application of operando ORP-EIS for the in-situ monitoring of acid anion incorporation during anodizing Vrije Universiteit Brussel

Meisam Dabiri Havigh, Kristof Marcoen, Benny Wouters, Noel Hallemans, Martin Bojinov, Tom Hauffman, John Lataire, Herman Terryn, Annick Hubin

Operando odd random phase electrochemical impedance spectroscopy (ORP-EIS) is applied to monitor the anodizing process of AA2024 in acidic media. The impedance data reveals the presence of inductive behavior during the process. We correlate this inductive behavior to the acid anion incorporation during anodizing using the surface charge approach. Moreover, the impact of anodizing parameters – including anodizing DC potential, electrolyte type ...