65 documents found, page 1 of 7
The Role of Cu-Based Intermetallic on the Direct Growth of a ZnAl LDH Film on A...
Bouali, A. C.; Serdechnova, M.; Yasakau, K; Lutz, A.; Wiese, G.; Terryn, H.; Ferreira, M. G. S.; Zheludkevich, M. L.The direct ZnAl layered double hydroxide growth on AA2024 is a fast-occurring reaction, 18 yet is characterized by an inhomogeneous film thickness. It has been shown that at the periphery 19 of Cu-rich intermetallic, the flakes tend to be larger and denser. A combination of in situ and 20 ex situ measurements were used to monitor the changes in the layered double hydroxide film 21 grown on the regions of interm...
The effect of carboxylate compounds on Volta potential and corrosion inhibition...
Yasakau, K. A.; Maltseva, A.; Lamaka, S. V.; Mei, Di; Orvi, H.; Volovitch, P.; Ferreira, M. G. S.; Zheludkevich, M. L.Corrosion protection and surface properties of Magnesium (Mg) containing 51 ppm 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-Mg and CP-Mg, while the Sal was efficient in inhibition of CP-M...
Insights into corrosion behaviour of uncoated Mg alloys for biomedical applicat...
Neves, C. S.; Sousa, L.; Freitas, M. A.; Costa, C.; Teixeira, J. P.; Fraga, S.; Pinto, Edgar; Almeida, A.; Scharnagl, N.; Zheludkevich, M. L.MgCa and MgGd series of alloys are often reported as promising candidates for biomedical applications. In the present study, cytotoxicity and corrosion behavior of Mg1Ca and Mg10Gd alloys in different electrolytes (NaCl, PBS, MEM) have been investigated in order to make a direct comparison and understand the mechanisms behind their performance. Potentiodynamic polarization and electrochemical impedance spectros...
Mechanism of LDH direct growth on aluminum alloy surface: a kinetic and morphol...
Bouali, A. C.; Iuzviuk, M. H.; Serdechnova, M.; Yasakau, K. A.; Drozdenko, D.; Lutz, A.; Fekete, K.; Dovzhenko, G.; Wieland, D. C. F.; Terryn, H.The growth of ZnAl layered double hydroxide (LDH) on the AA2024 surface was monitored using synchrotron high-resolution X-ray diffraction. Data were analyzed using the Avrami−Erofe’ev kinetic model. Accordingly, the LDH film growth is governed by a two-dimensional (2D) diffusion-controlled reaction with a zero nucleation rate. Additional methods, including ex situ atomic force microscopy/scanning Kelvin probe f...
Sol-gel derived lanthanide-substituted layered double hydroxides Mg3/Al1-xLnx
Smalenskaite, A.; Şen, S.; Salak, A.N.; Ferreira, M. G. S.; Beganskiene, A.; Kareiva, A.Mg/Al/Ln (Ln = Nd, Sm, Eu) layered double hydroxides (LDHs) were synthesized using sol–gel method for the first time to the best our knowledge. The obtained materials were characterized by X-ray di raction analysis and fluorescence spectroscopy. The phase composition and luminescent properties of these LDHs were investigated and discussed. The Ln3+ substitution e ects were investigated in the Mg3Al1−xLnx LDHs b...
Biocompatible and biodegradable functional coatings with natural occurring mate...
Sousa, Isabel Cristina; Neves, Cristina; Fraga, Sónia; Teixeira, João Paulo; Scharnagl, Nico; Zheludkevich, Mikhail; Ferreira, M. G. S.; Tedim, JoãoMagnesium alloys are amidst the most innovative materials for biomedical applications, as they show a set of unique properties, namely appropriate mechanical properties and biodegradability, when compared to other alloys. Although these properties make them suitable for medical implants, the main challenge is the uncontrolled corrosion. Mg degradation is fast, inhomogeneous, localized and often accompanied by h...
A novel bilayer system comprising LDH conversion layer and sol-gel coating for ...
Yasakau, K.A.; Kuznetsova, A.; Kallip, S.; Starykevich, M.; Tedim, J.; Ferreira, M. G. S.; Zheludkevich, M.L.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. Microstructur...
Effect of the anodic titania layer thickness on electrodeposition of zinc on Ti...
Starykevich, M.; Salak, A. N.; Ivanou, D. K.; Yasakau, K. A.; André, P. S.; Ferreira, R. A. S.; Zheludkevich, M. L.; Ferreira, M. G. S.
Corrosion inhibition of copper in aqueous chloride solution by 1H-1,2,3-triazol...
Ofoegbu, Stanley Udochukwu; Galvão, Tiago L. P.; Gomes, José R. B.; Tedim, João; Nogueira, Helena I. S.; Ferreira, M. G. S.; Zheludkevich, M. L.Triazoles are well-known organic corrosion inhibitors of copper. 1H-1,2,3-Triazole and 1,2,4-triazole, two very simple molecules with the only difference being the positions of the nitrogen atoms in the triazole ring, were studied in this work as corrosion inhibitors of copper in 50 mM NaCl solution using a set of electrochemical and analytical techniques. The results of electrochemical tests indicate that 1H-1...
A comparative study of co-precipitation and sol-gel synthetic approaches to fab...
Smalenskaite, A.; Vieira, D.E.L.; Salak, A.N.; Ferreira, M. G. S.; Katelnikovas, A.; Kareiva, A.Mg/Al/Ce layered double hydroxides (LDHs) intercalated with carbonate and hydroxide anions were synthesized using co-precipitation and sol-gel method. The obtained materials were characterized by thermogravimetric (TG) analysis, X-ray diffraction (XRD) analysis, fluorescence spectroscopy (FLS) and scanning electron microscopy (SEM). The chemical composition, microstructure and luminescent properties of these LD...