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Unraveling the formation mechanism of hybrid Zr conversion coating on advanced high strength stainless steels Vrije Universiteit Brussel

Mohaddese Nabizadeh, Kristof Marcoen, El Amine Mernissi Cherigui, Thomas kolberg, Daniel Schatz, Herman Terryn, Tom Hauffman
This research unravels the formation mechanism of a hybrid conversion treatment including the well-established Zr conversion coating with a silane-based organic additive and Cu-based inorganic additive. The deposition mechanism of this coating was investigated on the thermal oxide film of Advanced High Strength Stainless Steels (AHSSS). This coating has been characterized using advanced surface analytical techniques such as XPS, FEG-AES, GDOES, ...

Hydrothermal deposition of high strength biocompatible magnesium phosphate coating through in situ conversion of AZ91D-3Ca magnesium substrate Ghent University

Farasat Iqbal, Asif Ali, Mahnoor Naveed, Fakhera Ikram, Hira Fatima
Magnesium and its alloys are biodegradable and biocompatible with elastic modulus close to the natural bone which makes them suitable as an orthopedic implant. Poor corrosion resistance and high hydrogen evolution rate are two factors hindering their use as commercial implants. To overcome these challenges, a biocompatible magnesium phosphate coating was deposited using a single step hydrothermal method. Scanning Electron Mi-croscopy (SEM/EDX) ...

Operando odd random phase electrochemical impedance spectroscopy (ORP-EIS) for in-situ monitoring of the Zr-based conversion coating growth in the presence of (in)organic additives Vrije Universiteit Brussel

Meisam Dabiri Havigh, Mohaddese Nabizadeh, Benny Wouters, Noel Hallemans, Tom Hauffman, John Lataire, Annick Hubin, Herman Terryn
Operando odd random phase electrochemical impedance spectroscopy (ORP-EIS) is introduced as an in-situ monitoring tool to directly monitor the conversion treatment of zinc in a hybrid Zr-based solution containing aminosilane and Cu additives. SEM and EDX are applied to investigate the morphology and elemental composition of the oxide film. Results show that the operando ORP-EIS provides an opportunity to investigate the growth of the conversion ...

Appearance of a conductive carbonaceous coating in a $CO_{2}$ dielectric barrier discharge and its influence on the electrical properties and the conversion efficiency University of Antwerp

Igor Belov, Sabine Paulussen, Annemie Bogaerts
This work examines the properties of a dielectric barrier discharge (DBD) reactor, built for CO2 decomposition, by means of electrical characterization, optical emission spectroscopy and gas chromatography. The discharge, formed in an electronegative gas (such as CO2, but also O-2), exhibits clearly different electrical characteristics, depending on the surface conductivity of the reactor walls. An asymmetric current waveform is observed in the ...

Nanoscopic and in-situ cross-sectional observations of Li-based conversion coating formation using liquid-phase TEM Vrije Universiteit Brussel

Ali Kosari, Frans Tichelaar, Peter Visser, Peyman Taheri, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

Lithium salts have been proposed as promising environmentally friendly alternatives to carcinogenic hexavalent chromium-based inhibitors for the corrosion protection of aerospace aluminium alloys (AAs). Incorporated into organic coatings, lithium salts are released at damaged locations to establish a conversion layer in which distinct sublayers have different barrier characteristics. Thus, detailed knowledge on the sequence of formation ...

Cross-sectional characterization of the conversion layer formed on AA2024-T3 by a lithium-leaching coating Vrije Universiteit Brussel

Ali Kosari, Peter Visser, Frans Tichelaar, S. Eswara, J. N. Audinot, T. Wirtz, H. Zandbergen, Herman Terryn, Johannes M. C. Mol

This work focuses on the cross-sectional characterization of the protective conversion layer formed on AA2024-T3 by lithium-leaching from a polyurethane coating in a corrosive environment. The layer shows a multi-layered arrangement comprising nanoscopic local phases. Transmission electron microscopy (TEM) and complementary high-resolution secondary ion mass spectroscopy (SIMS) were employed to observe the cross-sections of the entire layer ...

On the use of AES data analysis to determine local enrichments of conversion coating elements at intermetallic particles on rolled Al Vrije Universiteit Brussel

Pieter Bouckenooge, Herman Terryn, Oliver Bauer, Katrin Eckhard
In this paper, the behaviour of the industrial applied Ti/Zr conversion coating (CC)
pretreatment on rolled automotive aluminium samples (AA5182) is analysed. Due to
its nanometre lateral and depth resolution, Auger electron spectroscopy (AES) is used
to analyse the CC distribution at surface cathodic intermetallic particles. As a result
of its high surface sensitivity, the AES technique is very susceptible to differences in ...

Microstructured ZrO2 coating of iron oxide for enhanced CO2 conversion Ghent University

Bo Jin, Hilde Poelman, Christophe Detavernier, Zhiwu Liang, Guy Marin, Vladimir Galvita
This work provides a way to design oxygen carriers for chemical looping. Starting from Prussian blue microcubes, Zr-promoted Fe-based materials are developed for the conversion of CO2 into CO. Thermally induced oxidative decomposition of ZrO2-coated Prussian blue under the protection of the firstly formed ZrO2 shell leads to the formation of hollow structured materials. Detailed activity tests and in-situ characterization are used to investigate ...