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Effect of EDTA on properties of layered double hydroxides deposited on Mg substrates
 Tkadlec, Tomáš ; Doskočil, Leoš (referee) ; Buchtík, Martin (advisor)
The subject of the bachelor's thesis was the preparation and characterization of MgAl LDH coatings on Mg substrates prepared by powder metallurgy with the aim of improving corrosion resistance. The coatings were prepared in a reaction mixture with various concentrations of EDTA. The corrosion resistance of the coated samples was analyzed using potentiodynamic measurements and compared with uncoated Mg. The sample prepared with a 5mM concentration of EDTA in the reaction mixture showed the best corrosion resistance. Higher concentrations of EDTA led to a deterioration of corrosion properties. The morphology and structure of the coatings and the elemental composition were described using electron microscopy and EDS analysis. Phase analysis was performed using X-ray diffraction (XRD). It was demonstrated that EDTA affects the structure of LDH coatings. The concentration of EDTA above 25mM in the reaction mixture results in the formation of Al(OH)3 coatings.
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