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Preparation and characterization of magnesium hydroxide on the surface of AZ31 magnesium alloy depending on the hydroxide cation used
 Bejček, Martin ; Hasoňová, Michaela (referee) ; Doskočil, Leoš (advisor)
The bachelor thesis deals with the preparation and characterization of magnesium hydroxide on the surface of AZ31 alloy depending on the hydroxide cation used. The theoretical part focuses on magnesium and also on its alloys. Furthermore, corrosion in aqueous and chloride environments is discussed. The last chapter of the theoretical part focuses on the formation and preparation of magnesium hydroxide on magnesium alloys. The experimental part describes the actual hydrothermal synthesis of protective coatings on AZ31 magnesium alloy as well as the different methods used during the study. A temperature of 120 °C and different synthesis times (2h, 4h, 8h, 12h and 24h) were chosen as preparation conditions. The methods used included SEM-EDS analysis to document the surface and coating thickness of the material. This was followed by a potentiodynamic polarization method to determine the corrosion resistance of the prepared samples in a 0.15M NaCl. The last analysis was FTIR spectrometry, which served to determine the compounds that made up the protective coating. The results showed that the cations of the hydroxides used did not affect the morphology or the amount of prepared magnesium hydroxide on AZ31 alloy. The resulting coatings were characterized by good corrosion resistance compared to the reference AZ31 alloy. The best results were obtained for 24h samples. The thickness of the coatings reached 10 m at 120 °C and at a hydrothermal synthesis time of 24 h.
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