5 documents found, page 1 of 1
Redução electroquímica de iões de terras raras e o seu efeito na corrosão de me...
Oliveira, Marco; Bastos, A.C.; Kallip, Silvar; Zheludkevich, Mikhail; Ferreira, M.G.S.RESUMO: Os iões de terras raras estão entre os inibidores de corrosão de nova geração mais promissores. No entanto, foram encontradas condições onde a corrosão é acelerada na presença destes iões [1]. O caso mais relevante devido à sua importância é o aumento da corrosão do zinco no par galvânico zinco-ferro. Esse aumento está associado a uma reacção catódica adicional inesperada que é observada nas curvas de p...
Atomic layer deposition of nanometric alumina for corrosion protection of heter...
Oliveira, Marco P.; Silva, Ricardo M.; Yasakau, Kiryl A.; Bastos, Alexandre; Kallip, Silvar; Zheludkevich, Mikhail L.; Silva, Rui F.Nanometric layers of Al2O3 were applied by atomic layer deposition (ALD) on 2024-T3 aluminium alloy. The ALD layers suppressed the corrosion of the alloy as confirmed by Scanning Kelvin Probe Force Microscopy (SKPFM), polarization curves and Electrochemical Impedance Spectroscopy (EIS). The protection provided by the ALD layers weakened with the time of immersion and this was attributed to the incorporation of ...
High-density antimicrobial peptide coating with broad activity and low cytotoxi...
Rai, Akhilesh; Pinto, Sandra; Evangelista, Marta B.; Gil, Helena; Kallip, Silvar; Ferreira, Mario G. S.; Ferreira, LinoMedical device-associated infections are a multi-billion dollar burden for the worldwide healthcare systems. The modification of medical devices with non-leaching coatings capable of killing microorganisms on contact is one of the strategies being investigated to prevent microorganism colonization. Here we developed a robust antimicrobial coating based on the chemical immobilization of the antimicrobial peptide...
Active self-healing coating for galvanically coupled multi-material assemblies
Serdechnova, Maria; Kallip, Silvar; Ferreira, Mario G. S.; Zheludkevich, Mikhail L.A new \"self-healing\" coating concept for active corrosion protection on galvanically coupled multi-material structures is reported in the present work. The novel approach is based on the combination of two types of nanocontainers with two different inhibitors in the same coating system. The nanocontainers confer a triggered release of both inhibitors which act in a synergistic way when an aluminum alloy is ga...
Protection of 2024-T3 aluminium alloy by corrosion resistant phytic acid conver...
Shi, Hongwei; Han, En-Hou; Liu, Fuchun; Kallip, SilvarThe corrosion protection properties of environmentally friendly phytic acid conversion coatings were studied on 2024-T3 aluminium alloy. The films were prepared under acidic conditions with various pH values and characterised by SEM, EDS, ATR-FTIR and electrochemical techniques. The results indicate that the conversion coatings obtained by immersing the alloy in phytic acid solutions at pH from 3 to 5.5 provide...