A5084710741- Layered Double Hydroxides Synthesis and Applications
- Corrosion Behavior and Inhibition
- Magnesium Oxide Properties and Applications
- Magnesium Alloys: Properties and Applications
- Aluminum Alloys Composites Properties
- Advanced ceramic materials synthesis
- Metallic Glasses and Amorphous Alloys
- Metal-Organic Frameworks: Synthesis and Applications
- Concrete Corrosion and Durability
- Advanced Welding Techniques Analysis
- Chemical Synthesis and Characterization
- Analytical Chemistry and Sensors
- Anodic Oxide Films and Nanostructures
- Material Dynamics and Properties
- Polyoxometalates: Synthesis and Applications
- Hydrogen embrittlement and corrosion behaviors in metals
- Electrodeposition and Electroless Coatings
- Chemical Synthesis and Reactions
- Theoretical and Computational Physics
- High-Temperature Coating Behaviors
- Electrochemical Analysis and Applications
Helmholtz-Zentrum Hereon
2017-2022
Institute of Materials Research of the Slovak Academy of Sciences
2019-2020
Philips (United Kingdom)
2020
Centre National de la Recherche Scientifique
1988
This work reports a novel approach for growing layered double hydroxide (LDH) films on any plasma electrolytic oxidation (PEO) coated AA2024 independently of the nature PEO coating. The specific coating chosen to carry out this is considered be not suitable direct LDH growth because phase composition and morphological features. In paper, we describe new methodology that consists covering with thin layer aluminum oxide based xerogel as source aluminate ions subsequent in-situ growth. X-ray...
The dissimilarities and features of the crystal structure ZnAl LDH-NO3 conversion layers grown directly on pure zinc aluminum alloy 2024 were investigated in present paper. Although nature cations double hydroxides are same both cases (Al3+ Zn2+), their sources differ according to substrate. This leads a difference cationic interlayer structure, which consequently influences anionic exchange reaction. In frame this work, kinetics anion-exchange nitrate by chloride was as well resulting...
Sodium salts of mono- and di- carboxylic acids (glycolic, fumaric benzoic acid) were studied as corrosion inhibitors for AM50 alloy in pH neutral aqueous NaCl environment. Hydrogen evolution, electrochemical surface characterization techniques employed to reveal their inhibition mechanism, whilst the molecular features investigated by quantum chemical calculation. All reduced anodic dissolution efficiency generally increased with time concentration from 5 mM 100 mM. The mechanism can be...
Plasma electrolytic oxidation (PEO) is an environmentally friendly anodizing technique leading to the formation of a ceramic-like coatings under high-voltage discharges. Layered double hydroxides (LDHs) were grown directly on γ, α, and amorphous Al2O3 powders, respectively, in order investigate phase responsible for in-situ LDH growth PEO coating. Furthermore, it shown that limited by high tortuosity layer accessibility Al ( OH ) 4 − anions from substrate covered with thin aluminum oxide,...
Kinetics parameters for three anion exchange reactions - Zn-LDH-NO3 Zn-LDH-Cl, Zn-LDH-SO4 and Zn-LDH-VOx were obtained by in situ synchrotron study. The first the second ones are two-stage reactions; stage is characterized two-dimensional diffusion-controlled reaction following deceleratory nucleation a one-dimensional also with decelerator effect. In case of NO3 Cl host anions completely released, while SO42 ends without complete release nitrate anions. one-stage goes much slower than...
The growth of ZnAl layered double hydroxide (LDH) on the AA2024 surface was monitored using synchrotron high-resolution X-ray diffraction. Data were analyzed Avrami–Erofe'ev kinetic model. Accordingly, LDH film is governed by a two-dimensional (2D) diffusion-controlled reaction with zero nucleation rate. Additional methods, including ex situ atomic force microscopy/scanning Kelvin probe microscopy (AFM/SKPFM) supported in open-circuit potential (OCP) measurements together scanning electron...
The direct ZnAl layered double hydroxide growth on AA2024 is a fast-occurring reaction, yet characterized by an inhomogeneous film thickness. It has been shown that at the periphery of Cu-rich intermetallic, flakes tend to be larger and denser. A combination in situ ex measurements were used monitor changes grown regions intermetallics. Immediately after immersion, activation intermetallic phases observed due dealloying process with almost immediate growth. Dealloying followed trenching...
Abstract This study focuses on the corrosion phenomena occurring between aluminium AA5083 and AZ31 magnesium sheets, joined with a coated steel self‐piercing rivet, by punch rivet technology. These assemblies were studied immersion tests scanning vibrating electrode technique (SVET) in sodium chloride solutions, order to evaluate effects of joint geometry resistance. The observed results also used for validation transient finite element method (FEM) simulations. A fully coupled continuum...
Abstract The objective of this work is to investigate the scale effect spontaneous solution evaporation during SVET (Scanning Vibrating Electrode Technique) measurements and demonstrate how it biases final results. When maps are continuously acquired for more than several hours, measured currents smaller expected. This attributed solvent (typically water) which leads an increase in conductivity over time. If not considered when converting potential differences into local current densities,...
Kinetics parameters for three anion exchange reactions - Zn-LDH-NO3 Zn-LDH-Cl, Zn-LDH-SO4 and Zn-LDH-VOx were obtained by in situ synchrotron study. The first the second ones are two-stage reactions; stage is characterized two-dimensional diffusion-controlled reaction following deceleratory nucleation a one-dimensional also with decelerator effect. In case of NO3 Cl host anions completely released, while SO42 ends without complete release nitrate anions. one-stage goes much slower than...