Degradation of Sol-Gel Acrylic Coatings Based on Si and Zr Investigated Using Electrochemical Impedance, Infrared and X-Ray Photoelectron Spectroscopies

Rodič, Peter; Zanna, Sandrine; Milošev, Ingrid; Marcus, Philippe

doi:10.3389/fmats.2021.756447

Cited by 7 publications

(12 citation statements)

References 38 publications

(68 reference statements)

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“…In addition, coatings containing zirconium in the sol-gel network further improve the silane matrix's coating properties [13][14][15]. This was confirmed in Si-O-Zr (Si/Zr) hybrid coatings based on tetraethyl orthosilicate (TEOS), 3-methacryloxypropyl trimethoxysilane (MAPTMS), zirconium(IV) n-propoxide (ZTP), and methacrylic acid (MAA) [11,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 81%

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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Section: Introductionmentioning

confidence: 81%

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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“…Conventional sol-gel synthesis, also applied in several examples on zirconium conversion coatings, [88][89][90][91] most often includes alkoxy precursors, enabling fine-tuning of hydrolytic rate and path through the ratio of alkoxy precursors to water as well as the addition of various complexing agents. 81 This leads to separated sol and gel stages.…”

Section: +mentioning

confidence: 99%

The Aqueous Chemistry of Zirconium as a Basis for Better Understanding the Formation of Zirconium Conversion Coatings: Updated Thermodynamic Data

Kras

Costa

2023

J. Electrochem. Soc.

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This work tackles the aqueous chemistry of Zr, aiming to contribute to a better understanding of Zr conversion coatings as one of the important contemporary means of corrosion protection. Equilibrium predominance diagrams based on experimentally confirmed Zr–OH and Zr–F aqueous species concerning Zr amorphous solid phase, along with an updated Zr EpH (Pourbaix) diagram, are constructed. Since ZrO2+ existence had been conclusively disproven in both the aqueous and solid states, we chose to depict mononuclear species with ZrOH3+ and polynuclear with Zr4(OH)88+. The formation of the Zr solid phase is assumed to include Zr tetrameric species, Zr4(OH)88+, as a fundamental building block thereof. The role of F– and ZrF62– ions in Zr conversion baths and subsequently formed coatings is described. The introduction of ZrF62– anions keeps Zr solvated in the form of a complex, thus preventing the early onset of hydrolysis. The conversion of Zr species and the coating formation mechanism are further discussed from electrochemical and sol-gel perspectives, aiming to give a foundation for future predictions and rationalisation of Zr conversion coating formation, with the possibility of extensions to various bath additives.

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“…However, after hydrolysis and condensation of OCL-modified precursors bearing reactive units such as polymerizable carbon bonds, crosslinking or curing follows in the presence of heat or UV light and a radical initiator/curing agent such as azobisisobutyronitrile and dibenzoyl peroxide is required to form hybrid polymers. These OCL-derived hybrid polymers have been applied to various fields such as optics [90,91], anti-corrosion coatings [92], etc. The preparation conditions and essential structural elements that have been used in some applications are summarized in Table 2.…”

Section: Inorganic-organic Composites and Membranes From Network-form...mentioning

confidence: 99%

A Brief Overview of the Microstructural Engineering of Inorganic–Organic Composite Membranes Derived from Organic Chelating Ligands

Lawal

Kanezashi

2023

Membranes

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This review presents a concise conceptual overview of membranes derived from organic chelating ligands as studied in several works. The authors’ approach is from the viewpoint of the classification of membranes by matrix composition. The first part presents composite matrix membranes as a key class of membranes and makes a case for the importance of organic chelating ligands in the formation of inorganic–organic composites. Organic chelating ligands, categorized into network-modifying and network-forming types, are explored in detail in the second part. Four key structural elements, of which organic chelating ligands (as organic modifiers) are one and which also include siloxane networks, transition-metal oxide networks and the polymerization/crosslinking of organic modifiers, form the building blocks of organic chelating ligand-derived inorganic–organic composites. Three and four parts explore microstructural engineering in membranes derived from network-modifying and network-forming ligands, respectively. The final part reviews robust carbon–ceramic composite membranes as important derivatives of inorganic–organic hybrid polymers for selective gas separation under hydrothermal conditions when the proper organic chelating ligand and crosslinking conditions are chosen. This review can serve as inspiration for taking advantage of the wide range of possibilities presented by organic chelating ligands.

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Degradation of Sol-Gel Acrylic Coatings Based on Si and Zr Investigated Using Electrochemical Impedance, Infrared and X-Ray Photoelectron Spectroscopies

Cited by 7 publications

References 38 publications

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

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

The Aqueous Chemistry of Zirconium as a Basis for Better Understanding the Formation of Zirconium Conversion Coatings: Updated Thermodynamic Data

A Brief Overview of the Microstructural Engineering of Inorganic–Organic Composite Membranes Derived from Organic Chelating Ligands

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