Kiryl Yasakau

Kiryl Yasakau
University of Aveiro | UA · CICECO - Centre for Research in Ceramics and Composite Materials

PhD

About

56
Publications
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4,564
Citations

Publications

Publications (56)
Article
Alkali metal nitrates were successfully used as starting chemicals in the production of composite CO2 separation membranes. The easy conversion of nitrates into carbonates after high temperature annealing in CO2 is confirmed using techniques like FTIR (Fourier transform infrared) or selective NO3⁻ electrodes. This conversion shows a step like incre...
Article
Corrosion protection and surface properties of Magnesium (Mg) containing 51ppm Fe (HP-Mg) and 341 ppm Fe (CP-Mg) were assessed by EIS, AFM/SKPFM, and photoluminescence spectroscopy in NaCl solutions with/without fumarate (Fum), 2,5-pyridinedicarboxylate (PDCA) and salicylate (Sal) carboxylates. The PDCA was effective in corrosion inhibition of HP-M...
Article
In this work metallic pins made of Mg5Gd alloy were coated with magnetron sputtered PVD Mg5Gd layers. Immersion tests in Hank’s balanced salt solution (HBSS) were performed. The PVD coating drastically reduced the corrosion rate of the Mg5Gd pin. The corrosion mechanism of the coating was studied in model electrochemical measurements by Scanning Vi...
Article
A proper assignment of time constants is important for the correct interpretation of the electrochemical impedance spectra of coated substrates. In this work several model aluminium samples with different anodic oxide thicknesses were prepared and characterised. The aluminium samples were coated by a hybrid sol-gel formulation and studied by electr...
Article
Highlights: -Carboxylates modify kinetics of Mg(OH) 2 film growth on Mg during aqueous corrosion; - Mg(OH) 2 nano-crystals formed in inhibitors solutions limit Cl-access to Mg surface; - Salicylate adsorbs chemically on Mg(OH) 2 , dissolves Fe-containing inclusions; - 2,5-pyridinedicarboxylate precipitates in the form of coordination polymer; - In...
Preprint
Mechanisms of inhibition of Mg aqueous corrosion in presence of chloride by sodium salicylate (Sal), 2,5-pyridinedicarboxylate (PDC) and fumarate (Fum) were studied by in situ Raman spectroscopy, ATR-FTIR, GD-OES and hydrogen collection. In situ detected surface films were composed by Mg(OH)2 nano-crystals and included inhibitors. All carboxylates...
Article
In this work active corrosion protection of AA2024 by a bilayer system consisting of a LDH (layered double hydroxides) conversion layer coated by a sol-gel film was studied. Impedance and Scanning vibrating electrode technique (SVET) studies demonstrated an efficient active corrosion protection and self-healing abilities of the systems containing L...
Chapter
This chapter provides an overview of corrosion protection strategies using sol-gel coatings. The chapter starts by acknowledging current state of corrosion engineering and main directions in corrosion protection of metals specifically addressing how sol-gel systems differ from other coatings types. The examples of application of sol-gel coatings as...
Article
Zinc electrodeposition from a deep eutectic mixture of ZnCl2 and choline chloride/ethylene glycol on titanium covered by an anodic titania film of different thicknesses was studied. It was shown that thin titanium dioxide layers work as high resistive media and the rate of zinc deposition decreases with film thickness. Thicker titania layers (23 nm...
Chapter
This chapter provides an overview of corrosion protection strategies using sol-gel coatings. The chapter starts by acknowledging current state of corrosion engineering and main directions in corrosion protection of metals specifically addressing how sol-gel systems differ from other coatings types. The examples of application of sol-gel coatings as...
Article
In this work the influence of stripping/cooling atmospheres used after withdrawal of steel sheet from Zn or Zn-alloy melt on surface properties of Zn (Z) and Zn-Al-Mg (ZM) hot-dip galvanizing coatings has been studied. The aim was to understand how the atmosphere (composed by nitrogen (N2) or air) affects adhesion strength to model adhesive and cor...
Article
The mechanisms of the initial stages of localized corrosion at cut edges were investigated for adhesively bonded Zn (Z) and Zn-Al-Mg (ZM) galvanized steel. The results provided strong evidence for the localized nature of corrosion of galvanized coatings at the cut edges and at the adhesive/zinc interface. In both cases a defined localized corrosion...
Article
An active protective coating for ZE41 magnesium alloy was produced by sealing an anodic layer, loaded with 1,2,4-triazole, with a sol-gel film. An anodic oxide layer was formed using PEO in a silicate-fluoride alkaline solution. This thin (1.8 µm) porous PEO layer was impregnated with corrosion inhibitor 1,2,4-triazole and sealed with a silica-base...
Chapter
The detection of possible impacts in carbon-fiber-reinforced plastic (CFRP) structures is important for the evaluation of structural integrity of CFRP. Sol–gel-based sensitive coatings for impact detection on CFRP substrates have been developed and investigated by University of Aveiro (UAVR). The coatings are based on hybrid sol–gel formulations wi...
Chapter
Self-healing materials have the ability to repair themselves and recover functionality after degradation, damage and failure. This chapter reviews recent developments in self-healing protective coatings which contain rare earth-based inhibiting compounds for active corrosion protection of metals. These new ‘green’ inhibitors are being developed as...
Chapter
Nanocelluloses, including nanocrystalline cellulose, nanofibrillated cellulose and bacterial cellulose nanofibers, have become fascinating building blocks for the design of new biomaterials. Derived from the must abundant and renewable biopolymer, they are drawing a tremendous level of attention, which certainly will continue to grow in the future...
Article
The present work explores effects of shelf-life, temperature and the presence of cerium nitrate additive on the protective performance of sol–gel coatings applied on AA2024. These are important parameters when industrial applicability of coating formulations is considered. The studied sol–gel system is based on a combination of metalorganic precurs...
Article
The present work explores effects of shelf-life, temperature and presence of cerium nitrate additive on the protective performance of sol-gel coatings applied on AA2024. These are important parameters when industrial applicability of coating formulations is considered. The studied sol-gel system is based on a combination of metalorganic precursor t...
Article
Amorphous cerium molybdate nanowires (CMN) have been used to impart active corrosion protective properties to hybrid sol-gel coatings on AA2024. Inhibitive ability of the novel sal-gel coatings against corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized el...
Article
Full-text available
The active corrosion protection of metallic substrates can be achieved by the addition of corrosion inhibitors to protective coatings. However, direct mixing of inhibitors with coating formulations can lead to important drawbacks decreasing barrier properties of the coating and diminishing activity of the inhibitor. Nanocontainers for corrosion inh...
Article
The cerium molybdate nanowires were recently reported as an efficient inhibiting pigment for aluminum alloys. In the present work, the inhibition mechanism of localized corrosion of S-phase intermetallics in AA2024 was studied in detail using a complementary combination of localized and analytical techniques. A significant suppression of dealloying...
Conference Paper
Full-text available
Typical hybrid sol-gel formulation based on TPOZ and GPTMS has been used for incorporation of nanocontainers with corrosion inhibitors. The aim is to obtain active protection based on “self-healing” of defects in coatings. In this paper different nanocontainers loaded with inhibitors such as LDH, SiO2 nanoparticles and Halloysite nanotubes (HS) wer...
Article
The present paper brings report on a newly observed effect of synergistic corrosion inhibition of galvanically coupled metals by the combination of inhibitors. 1,2,3-Benzotriazole and Ce(NO3)3 were investigated here as a synergistic inhibiting mixture for Zn + Fe model galvanic couple. Microelectrode array cell specifically designed for investigati...
Article
In this paper the inhibitive performance of cerium molybdate nanowires prepared by a novel methodology is reported. The methodology is based on a low-temperature, controlled-rate mixing process. Structurally, cerium molybdate nanowires were found to be amorphous-like materials whose inhibiting action towards aluminium alloy 2024-T3 was demonstrated...
Article
This chapter provides an overview of nanotechnology-based self-healing coatings. Different perspectives on the self-healing concept are presented and discussed in detail, with particular relevance for different trends in terms of coating technology. The chapter starts with an introduction on the self-healing concept, followed by a short description...
Article
This paper presents measurements of local pH and local oxygen reduction current performed to complement SVET (Scanning Vibrating Electrode Technique) in the characterization of the chemical environment near artificial defects on coated 2024-T3 aluminum alloy during corrosion and inhibition. The main purpose is to give examples on how micropotentiom...
Article
The Volta potential difference (VPD) of oxide layers formed on an aluminum surface as a result of anodization in a neutral solution of boric acid, thermal oxidation in air, and immersion in boiling water was studied by scanning Kelvin probe force microscopy. The measured VPD value was correlated with the layer thickness. It has been suggested that...
Article
Surface properties of organic coatings, like scratch and abrasion resistance, gloss, hydrophilic and hydrophobic nature and easiness to clean, among others, can be modified by deposition of thin films using plasma polymerization processes. The properties are obtained with expense of the corrosion protection properties of the coating, since degradat...
Conference Paper
Active corrosion protection based on self-healing of defects in coatings is a vital issue for development of new advanced corrosion protection systems. However, there is a significant lack of experimental protocols which can be routinely used to reveal the self-healing ability and to study the active corrosion protection properties of organic and h...
Conference Paper
Full-text available
In this work a certain number of corrosion inhibitors for AA2024 were used as additives to the hybrid solgel formulations in order to confer active corrosion protection without damaging the coating. The 8- hydroxyquinoline, sodium metavanadate, benzotriazole and cerium nitrate were added at definite stage of the synthesis process. The Scanning Vibr...
Article
Sol–gel films are actively investigated during the last decade as possible candidates for environmentally friendly pre-treatments. However, the important drawback in this case is the lack of active corrosion protection and self-healing ability.In this work a certain number of corrosion inhibitors for AA2024 was used as additives to the hybrid sol–g...
Article
Bis-1,2-[triethoxysilylpropyl]tetrasulfide silane films containing CeO2·ZrO2 nanoparticles were deposited by dip-coating on galvanised steel substrates. The morphological features of the coated substrates were evaluated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The anti-corrosion performance of the modified silane fil...
Article
Aluminum alloys have found many applications in different branches of industry. In spite of the valuable properties, there is a significant drawback because of the strong corrosion susceptibility, especially in chloride-containing medium. The present work is focused on study of the 2024 aluminum alloy corrosion mechanism on early stages using Scann...
Article
The inhibition effect of trivalent lanthanide ( , ) cations toward the localized corrosion of 5083 aluminum alloy in chloride-containing solutions was investigated in the present work. Electrochemical impedance spectroscopy was employed to estimate the inhibition efficiency of the lanthanide species under study. Scanning Kelvin probe force micro...
Article
Titania-containing organic–inorganic hybrid sol–gel films have been developed as an alternative to chromate-based coatings for surface pretreatment of aluminium alloys. Stable hybrid sols were prepared by hydrolysis of 3-glycidoxypropyltrimethoxysilane and different titanium organic compounds in 2-propanol solution in the presence of small amounts...
Article
This work contributes to the development of a new generation of active corrosion protection coatings composed of hybrid sol-gel films doped with halloysite nanotubes able to release entrapped corrosion inhibitors in a controllable way. A silica-zirconia-based hybrid film was used in this work as an anticorrosion coating deposited on 2024 aluminum a...
Article
The presence of intermetallic inclusions very often plays a crucial role for the susceptibility of different aluminium alloys to localized corrosion attack. The intimate details of localized corrosion of 5083 aluminium alloy have been studied in the present work. Local techniques such as scanning Kelvin probe force microscopy, in situ atomic force...
Article
Active corrosion protection based on self-healing of defects in coatings is a vital issue for development of new advanced corrosion protection systems. However, there is a significant lack of experimental protocols, which can be routinely used to reveal the self-healing ability and to study the active corrosion protection properties of organic and...
Article
The inhibiting effect of several organic compounds on the corrosion of 2024 aluminium alloy in neutral chloride solution was investigated in the present work. The candidates were selected based on the assumption that effective inhibitors should form highly insoluble complexes with components of AA2024. Along with organic complexing agents, the salt...
Article
The present work aims at evaluating the surface morphology and the corrosion resistance of galvanised steel substrates pre-treated with bis-[triethoxysilylpropyl] tetrasulfide silane (BTESPT) solutions doped with cerium nitrate or zirconium nitrate. The silane pre-treatment leads to the formation of a silane coating in the metallic surface. The sur...
Article
Active corrosion protection of AA2024-T3 alloy has been provided by an environmental-friendly, well adhering pre-treatment system consisting of an inhibitor-loaded titanium oxide porous layer and a sol–gel based thin hybrid film. A novel approach aimed at developing a nanoporous reservoir for storing of corrosion inhibitors on the metal/coating int...
Article
The development of active corrosion protection systems for metallic substrates is an issue of prime importance for many industrial applications. The present work shows a new contribution to the development of a new protective system with self-healing ability composed of hybrid sol−gel films doped with nanocontainers that release entrapped corrosion...
Article
The self-healing anticorrosion effect of layer-by-layer (LbL) assembled nano-reservoirs (polyelectrolyte-coated nanoparticles) embedded in a hybrid coating deposited onto an Al alloy is investigated (see figure). The corrosion inhibitor, benzotriazole, is entrapped in the polyelectrolyte at the LbL assembly step; its release is initiated by local p...
Article
The mechanism of corrosion protection of the widely used 2024-T3 aluminum alloy by cerium and lanthanum inhibitors in chloride media is described in detail in the present work. The corrosion process was investigated by means of scanning Kelvin probe force microscopy (SKPFM), in situ atomic force microscopy, and scanning electron microscopy coupled...
Article
Impact of atomic oxygen is a main factor responsible for enhanced oxidation and fast degradation of spacecraft and satellite construction materials in low earth orbits. Thus, information concerning atomic oxygen concentration is important for spacecraft designers and manufacturers. Many sensors have been developed to perform atomic oxygen concentra...
Article
The 1,2,4-triazole, 3-amino-1,2,4-triazole, benzotriazole and 2-mercaptobenzothiazole were evaluated in the present work as corrosion inhibitors for protection of the 2024 aluminium alloy in neutral chloride solutions. The corrosion protection performance was investigated by means of DC polarization and electrochemical impedance spectroscopy (EIS)....
Article
Nanostructured hybrid sol–gel coatings doped with cerium ions were investigated in the present work as pre-treatments for the AA2024-T3 alloy. The sol–gel films have been synthesized from tetraethylorthosilicate (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS) precursors. Additionally the hybrid sol was doped with zirconia nanoparticles prepare...
Article
Full-text available
Kinetics of the oxidation of iron in fluxes of atomic and molecular oxygen have been studied over a wide temperature range from 573 to 1273 K. The influence of oxygen pre-dissociation on the oxidation rate was found negligible at 573–1073 K. At temperatures above 1073 K, when only FeO is formed, the rate of iron oxidation in atomic oxygen is substa...