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On the evaluation of ALD TiO_(2),ZrO_(2) and HfO_(2) coatings on corrosion and cytotoxicity performances

Journal of Magnesium and Alloys 2021年第5期9卷 1828-1841页

作者： Mirco Peron susanna cogo Maria Bjelland Abdulla Bin Afif Anup Dadlani Elisa Greggio Filippo Berto Jan Torgersen Department of Industrial and Mechanical Engineering Norwegian University of Science and TechnologyRichard Birkelands vei 2b7034 TrondheimNorway Department of Biology University of PadovaVia Ugo Bassi 58/b35131PadovaItaly

Magnesium alloys have been widely studied as materials for temporary implants,but their use has been limited by their corrosion ***,coatings have been proven to provide an effective *** only little explored in the field,Atomic Layer Deposition(ALD)stands out as a coating technology due to the outstanding film conformality and density ***,we provide first insights into the corrosion behavior and the induced biological response of 100 nm thick ALD TiO_(2),HfO_(2)and ZrO_(2)coatings on AZ31 alloy by means of potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS),hydrogen evolution and MTS colorimetric assay with L929 *** three coatings improve the corrosion behavior and cytotoxicity of the ***,HfO_(2)coatings were characterized by the highest corrosion resistance and cell viability,slightly higher than those of ZrO_(2)***_(2)was characterized by the lowest corrosion improvements and,though generally considered a biocompatible coating,was found to not meet the demands for cellular applications(it was characterized by grade 3 cytotoxicity after 5 days of culture).These results reveal a strong link between biocompatibility and corrosion resistance and entail the need of taking the latter into consideration in the choice of a biocompatible coating to protect degradable Mg-based alloys.

关键词： Atomic layer deposition(ALD) Coatings Corrosion resistance Cytocompatibility Magnesium

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