Surface analysis and electrochemical characterization on micro-patterns of biomedical Nitinol after nanosecond laser irradiating

In the present work, micro-pattern surfaces of Nitinol after a novel nanosecond laser irradiating were accurately and efficiently characterized. Fruitful 2D/3D images illustrate surface topography and roughness of micro/nanostructures. Energy dispersive spectrometer and X-ray photoelectron spectrometry was utilized to reveal surface compositions. Most importantly, the results of electrochemical corrosion experiments present the donuts-like micro-pattern surface performs the best anti-corrosion performance compared with other samples. All of the preliminary results clearly demonstrate the effects of nanosecond laser micro-processing on the surface state and the resultant corrosion behavior of Nitinol. The findings would provide a potential path way to simultaneously improve the corrosion resistance and biocompatibility of biomedical alloys by laser one-step manufacturing.