The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Mikhail L. Zheludkevich - One of the best experts on this subject based on the ideXlab platform.
-
layered double hydroxide based Active Corrosion protective sealing of plasma electrolytic oxidation sol gel composite coating on aa2024
Applied Surface Science, 2019Co-Authors: A.c. Bouali, M. G. S. Ferreira, Carsten Blawert, M Starykevich, E.a. Straumal, M. Serdechnova, D.c.f. Wieland, Jörg U. Hammel, S.a. Lermontov, Mikhail L. ZheludkevichAbstract:Abstract 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 of the PEO coating. The specific PEO coating chosen to carry out this work is considered to be not suitable for direct LDH growth because of phase composition and morphological features. In this paper, we describe a new methodology that consists of covering the PEO coating with a thin layer of aluminum oxide based xerogel as the source of aluminate ions for subsequent in-situ LDH growth. X-ray diffraction (XRD) and scanning electron microscope (SEM) images showed a successful formation of LDHs on the surface. An improvement in terms of Active Corrosion protection was also demonstrated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET).
-
Layered double hydroxide based Active Corrosion protective sealing of plasma electrolytic oxidation/sol-gel composite coating on AA2024
Applied Surface Science, 2019Co-Authors: A.c. Bouali, Mário G.s. Ferreira, Carsten Blawert, M Starykevich, E.a. Straumal, M. Serdechnova, D.c.f. Wieland, Jörg U. Hammel, S.a. Lermontov, Mikhail L. ZheludkevichAbstract:Abstract 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 of the PEO coating. The specific PEO coating chosen to carry out this work is considered to be not suitable for direct LDH growth because of phase composition and morphological features. In this paper, we describe a new methodology that consists of covering the PEO coating with a thin layer of aluminum oxide based xerogel as the source of aluminate ions for subsequent in-situ LDH growth. X-ray diffraction (XRD) and scanning electron microscope (SEM) images showed a successful formation of LDHs on the surface. An improvement in terms of Active Corrosion protection was also demonstrated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET).
-
a novel bilayer system comprising ldh conversion layer and sol gel coating for Active Corrosion protection of aa2024
Corrosion Science, 2018Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. Ferreira, Joao Tedim, A Kuznetsova, M StarykevichAbstract:Abstract 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 LDH layer loaded with vanadate Corrosion inhibitor. Microstructural and chemical analysis of the surface after Corrosion testing showed accumulation of chlorine signal in LDH coatings. The scavenging of chlorides and release of vanadate inhibitor from LDH can explain high efficiency of Corrosion inhibition of AA2024 by the novel protective system.
-
Towards Active Corrosion Protection of Mg Alloys Using Corrosion Inhibition Approaches
Magnesium Technology 2018, 2018Co-Authors: Mikhail L. Zheludkevich, S. V. Lamaka, Y. Chen, D. Hoeche, Carsten Blawert, Karl Ulrich KainerAbstract:The high susceptibility of Mg alloys to corrosive degradation is calling for new efficient Corrosion protection solutions. In the present paper we discuss the approach based on the introduction of new generation of Corrosion inhibitors into the composite protective coatings aiming at an additional Active Corrosion protection.
-
Active Corrosion Protection by Nanoparticles and Conversion Films of Layered Double Hydroxides
CORROSION, 2014Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Joao Tedim, Mário G.s. FerreiraAbstract: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...
Mário G.s. Ferreira - One of the best experts on this subject based on the ideXlab platform.
-
Layered double hydroxide based Active Corrosion protective sealing of plasma electrolytic oxidation/sol-gel composite coating on AA2024
Applied Surface Science, 2019Co-Authors: A.c. Bouali, Mário G.s. Ferreira, Carsten Blawert, M Starykevich, E.a. Straumal, M. Serdechnova, D.c.f. Wieland, Jörg U. Hammel, S.a. Lermontov, Mikhail L. ZheludkevichAbstract:Abstract 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 of the PEO coating. The specific PEO coating chosen to carry out this work is considered to be not suitable for direct LDH growth because of phase composition and morphological features. In this paper, we describe a new methodology that consists of covering the PEO coating with a thin layer of aluminum oxide based xerogel as the source of aluminate ions for subsequent in-situ LDH growth. X-ray diffraction (XRD) and scanning electron microscope (SEM) images showed a successful formation of LDHs on the surface. An improvement in terms of Active Corrosion protection was also demonstrated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET).
-
Active Corrosion Protection by Nanoparticles and Conversion Films of Layered Double Hydroxides
CORROSION, 2014Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Joao Tedim, Mário G.s. FerreiraAbstract: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...
-
Functionalized chitosan-based coatings for Active Corrosion protection
Surface and Coatings Technology, 2013Co-Authors: J. Carneiro, Joao Tedim, Mário G.s. Ferreira, Susana C.m. Fernandes, C.s.r. Freire, A. Gandini, Mikhail L. ZheludkevichAbstract:Abstract Chitosan-based coatings were suggested in this work as a “green” alternative for Active Corrosion protection of aluminum alloys. 2-Mercaptobenzothiazole (MBT) was used here as an efficient Corrosion inhibitor for AA2024. The electrochemical impedance spectroscopy has demonstrated a strong inhibiting action of MBT showing no Corrosion attack even after one week in full immersion tests when MBT-loaded chitosan coatings are applied. The surface properties of the chitosan coatings were improved by chemical grafting with poly(ethylene- alt -maleic anhydride) (PEMA) and poly(maleic anhydride- alt -1-octadecene) (POMA), aiming at increasing hydrophobicity that is crucial for Corrosion protection in atmospheric conditions. The high contact angles, in the range of 140°, were obtained on the MBT-containing chitosan films.
-
Active Corrosion protection of AA2024 by sol–gel coatings with cerium molybdate nanowires
Electrochimica Acta, 2013Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, Mário G.s. FerreiraAbstract:Abstract 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 sol–gel coatings against Corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of Corrosion activity in micro-scale defects made in sol–gel coatings loaded with CMN when compared to blank systems. The mechanism of Active protection involves release of cerium and molybdate ions from the sol–gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects.
-
Silica nanocontainers for Active Corrosion protection
Nanoscale, 2012Co-Authors: Frederico Maia, Mikhail L. Zheludkevich, Joao Tedim, Aleksey D. Lisenkov, Andrei N. Salak, Mário G.s. FerreiraAbstract:Novel self-healing protective coatings with nanocontainers of Corrosion inhibitors open new opportunities for long-term antiCorrosion protection of different metallic materials. In this paper a new type of functional nanoreservoir based on silica nanocapsules (SiNC) synthesized and loaded with Corrosion inhibitor 2-mercaptobenzothiazole (MBT) in a one-stage process is reported for the first time. Unlike conventional mesoporous silica nanoparticles, SiNC possess an empty core and shell with gradual mesoporosity, arising from the particular conditions of the synthetic route adopted, which confers significant loading capacity and allows prolonged and stimuli-triggered release of the inhibiting species. The kinetics of inhibitor release was studied at different pH values and concentrations of NaCl. The results show a clear dependence of the release profiles on Corrosion relevant triggers such as pH and Cl− concentration. When SiNC loaded with MBT are dispersed in NaCl solution, there is a significant decrease of the Corrosion activity on aluminium alloy 2024. More importantly, when SiNC–MBT is added to a conventional water-based coating formulation, the modified coating hampers Corrosion activity at the metal interface, better than in the case of direct addition of Corrosion inhibitor. Furthermore, self-healing is observed before and after artificially inflicting defects in the modified coatings. As a result, the developed nanocontainers show high potential to be used in new generation of Active protective coatings.
M. G. S. Ferreira - One of the best experts on this subject based on the ideXlab platform.
-
benzotriazole encapsulation in spray dried carboxymethylcellulose microspheres for Active Corrosion protection of carbon steel
Progress in Organic Coatings, 2020Co-Authors: Francyelle Calegari, M. G. S. Ferreira, Bruno Cesar Gregorio Da Silva, Joao Tedim, Marcos Antonio Coelho Berton, Claudia Eliana Bruno MarinoAbstract:Abstract Biopolymeric microspheres containing Corrosion inhibitor benzotriazole (BTA) were prepared by a spray-drying technique using carboxymethylcellulose (CMC-Na) as encapsulating material. The resulting microspheres were characterized by FTIR, TGA, SEM and TEM analysis. Microspheres containing BTA have an average diameter of 1.1 μm. FTIR analysis confirmed the presence of the core and encapsulating components. The release studies by UV−Vis spectrophotometry showed that the mechanism of inhibitor release from CMC-Na biopolymeric matrix is based on a hydrogel-swelling-driven mechanism triggered by water presence. Electrochemical impedance spectroscopy (EIS) measurements on bare carbon steel in NaCl solution revealed that the presence of CMC-Na does not affect the Corrosion inhibition mechanism associated with BTA. Furthermore, the microcapsules were added to an epoxy coating and its Active Corrosion protection performance was also investigated by EIS. The results obtained indicate that capsules loaded with BTA do not affect negatively the barrier properties of the coating, and contribute for the enhancement of the Corrosion protection of the metallic substrate. Therefore, this work shows the potential application of carboxymethylcellulose microspheres for development of new environmentally-friendly microcontainers for Corrosion inhibitors.
-
layered double hydroxide based Active Corrosion protective sealing of plasma electrolytic oxidation sol gel composite coating on aa2024
Applied Surface Science, 2019Co-Authors: A.c. Bouali, M. G. S. Ferreira, Carsten Blawert, M Starykevich, E.a. Straumal, M. Serdechnova, D.c.f. Wieland, Jörg U. Hammel, S.a. Lermontov, Mikhail L. ZheludkevichAbstract:Abstract 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 of the PEO coating. The specific PEO coating chosen to carry out this work is considered to be not suitable for direct LDH growth because of phase composition and morphological features. In this paper, we describe a new methodology that consists of covering the PEO coating with a thin layer of aluminum oxide based xerogel as the source of aluminate ions for subsequent in-situ LDH growth. X-ray diffraction (XRD) and scanning electron microscope (SEM) images showed a successful formation of LDHs on the surface. An improvement in terms of Active Corrosion protection was also demonstrated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET).
-
a novel bilayer system comprising ldh conversion layer and sol gel coating for Active Corrosion protection of aa2024
Corrosion Science, 2018Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. Ferreira, Joao Tedim, A Kuznetsova, M StarykevichAbstract:Abstract 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 LDH layer loaded with vanadate Corrosion inhibitor. Microstructural and chemical analysis of the surface after Corrosion testing showed accumulation of chlorine signal in LDH coatings. The scavenging of chlorides and release of vanadate inhibitor from LDH can explain high efficiency of Corrosion inhibition of AA2024 by the novel protective system.
-
Active Corrosion protection of aa2024 by sol gel coatings with cerium molybdate nanowires
Electrochimica Acta, 2013Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. FerreiraAbstract:Abstract 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 sol–gel coatings against Corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of Corrosion activity in micro-scale defects made in sol–gel coatings loaded with CMN when compared to blank systems. The mechanism of Active protection involves release of cerium and molybdate ions from the sol–gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects.
-
Active Corrosion protection of AA2024 by sol-gel coatings with cerium molybdate nanowires
Electrochimica Acta, 2013Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. FerreiraAbstract: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 sol-gel coatings against Corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of Corrosion activity in micro-scale defects made in sol-gel coatings loaded with CMN when compared to blank systems. The mechanism of Active protection involves release of cerium and molybdate ions from the sol-gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects. © 2013 Published by Elsevier Ltd. All rights reserved.
Kiryl Yasakau - One of the best experts on this subject based on the ideXlab platform.
-
a novel bilayer system comprising ldh conversion layer and sol gel coating for Active Corrosion protection of aa2024
Corrosion Science, 2018Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. Ferreira, Joao Tedim, A Kuznetsova, M StarykevichAbstract:Abstract 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 LDH layer loaded with vanadate Corrosion inhibitor. Microstructural and chemical analysis of the surface after Corrosion testing showed accumulation of chlorine signal in LDH coatings. The scavenging of chlorides and release of vanadate inhibitor from LDH can explain high efficiency of Corrosion inhibition of AA2024 by the novel protective system.
-
Active Corrosion Protection by Nanoparticles and Conversion Films of Layered Double Hydroxides
CORROSION, 2014Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Joao Tedim, Mário G.s. FerreiraAbstract: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...
-
Active Corrosion protection of aa2024 by sol gel coatings with cerium molybdate nanowires
Electrochimica Acta, 2013Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. FerreiraAbstract:Abstract 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 sol–gel coatings against Corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of Corrosion activity in micro-scale defects made in sol–gel coatings loaded with CMN when compared to blank systems. The mechanism of Active protection involves release of cerium and molybdate ions from the sol–gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects.
-
Active Corrosion protection of AA2024 by sol-gel coatings with cerium molybdate nanowires
Electrochimica Acta, 2013Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, M. G. S. FerreiraAbstract: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 sol-gel coatings against Corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of Corrosion activity in micro-scale defects made in sol-gel coatings loaded with CMN when compared to blank systems. The mechanism of Active protection involves release of cerium and molybdate ions from the sol-gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects. © 2013 Published by Elsevier Ltd. All rights reserved.
-
Active Corrosion protection of AA2024 by sol–gel coatings with cerium molybdate nanowires
Electrochimica Acta, 2013Co-Authors: Kiryl Yasakau, Mikhail L. Zheludkevich, Silvar Kallip, Mário G.s. FerreiraAbstract:Abstract 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 sol–gel coatings against Corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of Corrosion activity in micro-scale defects made in sol–gel coatings loaded with CMN when compared to blank systems. The mechanism of Active protection involves release of cerium and molybdate ions from the sol–gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects.
Dmitry G. Shchukin - One of the best experts on this subject based on the ideXlab platform.
-
Mesoporous silica nanoparticles for Active Corrosion protection
ACS nano, 2011Co-Authors: Dimitriya Borisova, Helmuth Möhwald, Dmitry G. ShchukinAbstract:This work presents the synthesis of monodisperse, mesoporous silica nanoparticles and their application as nanocontainers loaded with Corrosion inhibitor (1H-benzotriazole (BTA)) and embedded in hybrid SiOx/ZrOx sol−gel coating for the Corrosion protection of aluminum alloy. The developed porous system of mechanically stable silica nanoparticles exhibits high surface area (∼1000 m2·g−1), narrow pore size distribution (d ∼ 3 nm), and large pore volume (∼1 mL·g−1). As a result, a sufficiently high uptake and storage of the Corrosion inhibitor in the mesoporous nanocontainers was achieved. The successful embedding and homogeneous distribution of the BTA-loaded monodisperse silica nanocontainers in the passive anticorrosive SiOx/ZrOx film improve the wet Corrosion resistance of the aluminum alloy AA2024 in 0.1 M sodium chloride solution. The enhanced Corrosion protection of this newly developed Active system in comparison to the passive sol−gel coating was observed during a simulated Corrosion process by the ...
-
Sol‐Gel/Polyelectrolyte Active Corrosion Protection System
Advanced Functional Materials, 2008Co-Authors: Svetlana V. Lamaka, Mikhail L. Zheludkevich, Dmitry G. Shchukin, Daria V. Andreeva, Helmuth Möhwald, Mário G.s. FerreiraAbstract:This work presents a new type of feed-back Active coating with inhibitor-containing reservoirs for Corrosion protection of metallic substrates. The reservoirs are composed of stratified layers of oppositely charged polyelectrolytes deposited on AA2024 aluminum alloy coated with hybrid sol-gel film. The layer-by-layer assembled polyelectrolyte film with the entrapped Corrosion inhibitor is constructed by sequential spray-coating deposition of water solutions of poly(ethyleneimine), poly(sodium styrenesulfonate) and 8-hydroxyquiniline on the top of the sol-gel coating. The Active Corrosion protection of AA2024 alloy coated with SiO2/ZrO2 sol-gel film and modified by polyelectrolytes is demonstrated by electrochemical impedance spectroscopy and scanning vibrating electrode technique. The results obtained here show that polyelectrolyte films deposited atop of the hybrid sol-gel coating on AA2024 alloy remarkably improve the long-term protection performance providing additional “intelligent” antiCorrosion effect that results from delivery of inhibiting species “on demand”. This becomes possible since the configuration of the polyelectrolyte molecules depends on the presence of H+ ions making the polyelectrolyte film sensitive to the pH of the surrounding solution. The source of local pH changes is the Corrosion process starting in the micro- and nano-defects leading to increased permeability of the polyelectrolyte reservoir and, consequently, to controllable release of entrapped inhibitor.
-
sol gel polyelectrolyte Active Corrosion protection system
Advanced Functional Materials, 2008Co-Authors: Svetlana V. Lamaka, Mikhail L. Zheludkevich, Dmitry G. Shchukin, Daria V. Andreeva, Helmuth Möhwald, M. G. S. FerreiraAbstract:This work presents a new type of feed-back Active coating with inhibitor-containing reservoirs for Corrosion protection of metallic substrates. The reservoirs are composed of stratified layers of oppositely charged polyelectrolytes deposited on AA2024 aluminum alloy coated with hybrid sol-gel film. The layer-by-layer assembled polyelectrolyte film with the entrapped Corrosion inhibitor is constructed by sequential spray-coating deposition of water solutions of poly(ethyleneimine), poly(sodium styrenesulfonate) and 8-hydroxyquiniline on the top of the sol-gel coating. The Active Corrosion protection of AA2024 alloy coated with SiO2/ZrO2 sol-gel film and modified by polyelectrolytes is demonstrated by electrochemical impedance spectroscopy and scanning vibrating electrode technique. The results obtained here show that polyelectrolyte films deposited atop of the hybrid sol-gel coating on AA2024 alloy remarkably improve the long-term protection performance providing additional “intelligent” antiCorrosion effect that results from delivery of inhibiting species “on demand”. This becomes possible since the configuration of the polyelectrolyte molecules depends on the presence of H+ ions making the polyelectrolyte film sensitive to the pH of the surrounding solution. The source of local pH changes is the Corrosion process starting in the micro- and nano-defects leading to increased permeability of the polyelectrolyte reservoir and, consequently, to controllable release of entrapped inhibitor.
-
Buffering polyelectrolyte multilayers for Active Corrosion protection
Journal of Materials Chemistry, 2008Co-Authors: Daria V. Andreeva, Helmuth Möhwald, Dmitri Fix, Dmitry G. ShchukinAbstract:Polyelectrolyte multilayers successively deposited on an ultrasonically pre-treated metal surface demonstrate antiCorrosion self-healing behaviour by the blocking of the Corrosion processes without addition of any other inhibiting species due to their pH-buffering ability.