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Anticorrosion performance of ultrathin films of metal oxides formed by ALD on lightweight alloys

The topic addresses an atomic layer deposition (ALD) of ultrathin films of Hf, Ti and Zr oxides to protect lightweight metal alloys (Mg-Al) from environmental degradation. Mg-based alloys due to their lightness and superior mechanical properties are promising materials in many fields where reduction of weight and energy consumption are of importance: consumer electronics, computers, aircraft and automotive industries. However, high susceptibility of Mg to corrosion is an issue and effective protection means are in great demand. On the other hand, corrosion activity of intrinsically biocompatible Mg alloys could be regarded as a valuable property in biomedical applications, which enables harmless dissolution of implants in-vivo and eliminates need for secondary surgery to remove temporary implants for osteosynthesis, cardiovascular stents or tissue scaffolds. We will study the corrosion behavior of the ALD-protected alloys in the environment, which mimicries that in vivo. Also, the anticorrosion performance will be evaluated in terms of practical application by testing the samples under continuous condensation conditions according to ISO standard. Surface self-healing by phosphating of damaged locations will also be investigated. The following techniques will be employed: dc-voltammetry, EIS, XRD, SEM-EDS, XPS, QCM and corrosion cabinets.
 
For more information, please contact the theme supervisor E. Juzeliūnas