The presented research was aimed to determine the mechanical properties of the nanotubular oxide layer covered with hydroxyapatite coating. The Ti-13Zr-13Nb alloy was oxidised in 1M phosphoric acid with an addition of 0?5% HF for HF solution at 20 V voltage. The electrochemically assisted deposition of hydroxyapatite was performed at cyclic polarisation in NH 4 H 2 PO 4 and CaCl 2 solution at 80uC. The mechanical properties were determined by nanoindentation, nanocreep and nanoscratch tests. The surface examinations were made with the light, scanning electron and atomic force microscopes. The measurements showed the significant difference between an oxide layer and nanotubular oxide coated with hydroxyapatite. The observed differences may be explained by an appearance of mechanically strong oxide layer, to which the ceramic hydroxyapatite layer is not tightly bound. The obtained results suggest that the nanotubular oxide layers should be covered with nanohydroxyapatite coatings, which would come inside the nanotubes resulting in better adhesion.
Optical Coherence Tomography (OCT) is one of the most rapidly advancing techniques. This method is capable of non-contact and non-destructive investigation of the inner structure of a broad range of materials. Compared with other methods which belong to the NDE/NDT group (Non-Destructive Evaluation/Non-Destructive Testing methods), OCT is capable of a broad range of scattering material structure visualization. Such a non-invasive and versatile method is very demanded by the industry. The authors applied the OCT method to examine the corrosion process in metal samples coated by polymer films. The main aim of the research was the evaluation of the anti-corrosion protective coatings using the OCT method. The tested samples were exposed to a harsh environment. The OCT measurements have been taken at different stages of the samples degradation. The research and tests results have been presented, as well as a brief discussion has been carried out.
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